CN104836329B - Local-level dispatch supporting system capable of improving analyzing and processing capability of dispatcher during accident generation - Google Patents

Abstract

The invention relates to a ground dispatching support system capable of improving dispatchers' ability to analyze and deal with accidents, belonging to the field of control. It sets the equipment self-switching model in the online static safety analysis module of the ground surveying system, and in the security analysis module scans the expected fault, realizes the N-1 scan after the standby self-switching action, and the power flow after the standby self-switching action Perform calculations to accurately reflect the power flow changes after the automatic switching operation of the equipment, and generate an accident prediction text based on the analysis results; when using the online static safety analysis module for N‑1 scanning, the dispatcher can independently set the operation mode of the automatic switching device , in order to simulate and analyze the power flow distribution of the power grid under different operating modes, so that the dispatcher can conduct real-time online research on the safety and stability of the regional power grid, improve the real-time online research on the safety and stability of the power grid, and generate available information for the dispatcher Accident prediction texts to improve dispatchers' ability to deal with power grid accidents.

Description

Ground dispatching support that improves the ability of dispatchers to analyze and deal with accidents system

technical field

The invention belongs to the field of control, and in particular relates to a power grid monitoring intelligent dispatching system used in a district-level power dispatching system.

Background technique

With the continuous development of modern power technology, the scale of the power network is getting bigger and bigger, and the complexity is getting higher and higher.

With the increasing impact of regional natural disasters, geological disasters, environmental disasters and external damage on power grid security, higher requirements are put forward for the safe and stable operation of the power grid. The existing power grid monitoring technology cannot fully meet the needs of power grid development. In view of this situation, there is an urgent need to develop a series of practical and operable intelligent advanced applications on the intelligent dispatching technical support system to provide strong support for grid monitors to quickly handle faults, restore power supply, and formulate equipment maintenance plans, and further Improve the accuracy and speed of abnormal accident handling to ensure the safe and stable operation of the power grid.

The ground dispatching system currently used by a city power supply company of the State Grid is the ground dispatching system of a certain technology limited company. The platform adopts the definition of CIM/CIS data model following the IEC 61970 standard, and adopts CORBA technology to design a system integration framework following the IEC 61970 component reference model, and implements the IEC 61970 CIS interface. The system adopts server/client (C/S) structure, supports multiple contexts, can cross UNIX and PC hardware platforms, and has the cross-platform ability of mixing different UNIX servers arbitrarily. Although the system provides a series of advanced application functions such as online static security analysis and dispatcher training simulation system (DTS), it aims to facilitate dispatchers to analyze and simulate power flow conditions The ability to analyze and deal with faults during accidents, but in practical applications, there are still many problems. For example, when a main transformer failure occurs in a substation, the static safety analysis module and DTS cannot correctly simulate the backup and automatic operation of the real power grid, and reasonably calculate the corresponding power flow changes, and at the same time cannot generate reasonable and usable accident prediction text. In addition, the maintenance function of the standby automatic switching model is not opened in the system, and the dispatcher cannot independently maintain the standby automatic switching operation mode.

Contents of the invention

The technical problem to be solved by the present invention is to provide a ground dispatch dispatching support system that can improve the dispatcher’s ability to analyze and process accidents, which can conveniently set the automatic operation mode of equipment during N-1 scanning through online static security analysis, It is convenient to analyze and simulate the distribution of power grid power flow under different operation modes, improve the safety and stability of real-time online research on the power grid, and generate scientific and usable accident prediction texts for dispatchers; provide a more scientific and practical dispatch support system for regional power grid monitoring personnel Advanced application functions can improve the ability of regulators to judge and handle accidents, improve the accuracy and speed of abnormal accident handling, further improve the intensive management level of the power grid, and provide strong technical support for the safe and stable operation of the power grid.

The technical solution of the present invention is to provide a ground dispatching support system capable of improving dispatchers' ability to analyze and process accidents, including an online static safety analysis module, which is characterized by:

In the online static safety analysis module, a standby automatic switching model is set to provide automatic safety device action simulation function for automatic switching;

Wherein, in the online static safety analysis module of the ground surveying system, in the scanning of expected faults, the analysis function of the standby automatic switching action is added to realize N-1 scanning after the standby automatic switching action, and the power flow after the standby automatic switching action is calculated , so as to accurately reflect the power flow change after the automatic switching action of the equipment, and generate an accident prediction text based on the analysis results;

When using the online static security analysis module to perform N-1 scanning, the dispatcher can independently set the operation mode of the self-switching device, so as to simulate and analyze the power flow distribution of the power grid under different operation modes, so that the ground dispatcher can Conduct real-time online research on the safety and stability of the regional power grid, improve the real-time online research on the safety and stability of the power grid, and generate available accident prediction texts for dispatchers, so as to improve dispatchers' emergency response capabilities for power grid accidents;

The ground dispatching support system described in it realizes the application of the action simulation function of the automatic safety device of the standby automatic switch in the static security analysis environment; the opening of the maintenance function of the standby automatic switch model enables the dispatcher to independently maintain the standby automatic switch Switching model, free to set the operation mode of the equipment automatic switching device, which can be closer to the real situation of the power grid, so as to facilitate the simulation and analysis of the power flow distribution of the power grid under different operating modes, so as to accurately analyze the network power flow distribution; it adopts the embedded automatic switching function Power flow calculation, the calculation of the load transfer situation not only considers the actual operation of the standby automatic switching device, but also takes into account the load transfer situation of the model outside the system, which improves the accuracy of the original power flow calculation and makes the calculation results more reflective. The power flow distribution of the real power grid is more practical and reference value for dispatchers; it realizes the power supply continuity analysis of important power users; and realizes the dispatcher's accident prediction support function.

Specifically, the action simulation function of the automatic safety device for automatic switching includes the action logic of a single standby automatic switching device, and the action logic of the single standby automatic switching device is as follows:

First, judge whether the main power supply is out of power, if it is out of power, enter the next step of judgment, otherwise end;

Secondly, judge whether the backup power supply is live, if it is charged, enter the next step of judgment, if it is not charged, all power supplies are effective, and the standby self-switching action is meaningless, so the judgment ends;

Third, judge whether the current operation mode meets the action requirements of standby automatic switching. The operation mode needs to be set in the standby automatic switching model maintenance function. If it is satisfied, then the standby automatic switch meets the action condition and takes action, otherwise the judgment ends.

Further, the ground dispatching support system calculates the power flow after the backup and self-commissioning action, and proceeds according to the following steps:

First, on the basis of the ground state power flow, shut down the disconnecting equipment in the power system and start the network topology. During the topology process, it is judged which standby automatic switching devices meet the action conditions, and these devices are screened out;

After the screening, select the one or a group of devices with the shortest action time among all qualified automatic switching devices to perform the switching action, and block these activated standby automatic switching devices after completion;

After a round of backup auto-switching action, restart the network topology, check the disconnection devices in the network, and check whether there is a backup auto-switching device that meets the action conditions. If there is a backup auto-switching device that meets the action conditions, repeat the previous item Action until there is no load action condition for the automatic switching device;

Finally, carry out power flow calculation and output the result.

Further, in the static safety analysis module, the ground dispatching support system realizes power flow calculation and output of corresponding accident plan text after the standby automatic commissioning action.

In the ground survey dispatching support system mentioned above, in the static safety analysis module, there are three initial methods to choose from before the safety analysis and calculation:

One is to take the real-time mode, that is, the real-time operation mode provided by the state estimation;

The second is the way of taking the tide, that is, the way of adjusting the tide through the dispatcher;

The third is to take the historical operation mode saved in the past. Under the historical operation mode saved in the past, the static security analysis can call the data section saved by the system through the start date, end date and current application, and read the relevant historical data section. Go to the corresponding static security analysis research mode of this machine.

Further, when the static safety analysis module is performing power flow calculation, after each disconnection analysis is completed, in addition to checking the over-limit situation of individual equipment such as line current, transformer capacity, generator output and bus voltage, it also Monitor the active power of a stable section consisting of lines and transformers.

Specifically, the described standby self-injection model adopts the following synchronization method between multiple platforms:

A. On the workstation of the dispatcher training simulation system, realize the maintenance of the standby automatic switching device through the standby automatic switching maintenance interface;

B. After the backup self-switching model of the dispatcher training simulation system is changed, it will automatically import the current backup self-switching model into the XML file and send it to the main and backup machines for static security analysis;

C. In the static security analysis module, set the monitoring program to monitor the export time of the XML file. If it is found that the export time in the XML file is newer than the model time of the current model, the XML file is automatically imported into the static security analysis model.

Specifically, the static safety analysis module of the ground dispatching support system adds the analysis function of the standby automatic switching action to the expected fault scanning, realizes N-1 scanning after the standby automatic switching action, and generates accident prediction text based on the analysis results , to facilitate dispatchers to carry out accident prediction work and obtain more accurate and usable calculation data;

Among them, the accident prediction work includes the following four components: operation situation before the accident, accident situation analysis, accident handling in the station and accident handling of the affected stations;

1) For the "operation situation before the accident", the accident prediction work will check the current operation mode of all main transformers in a specific substation, and output the corresponding results;

2) For the "Accident Handling in Stations" and "Accident Handling of Affected Plants and Stations", the accident prediction work shall be in accordance with the provisions of the "City Power Grid Dispatch Operation Regulations" and the "Supplementary Regulations on Strong Power Transmission of Municipal Power Grids". situation and data information, and deal with the corresponding accidents;

3) For the "accident situation analysis", the accident prediction work includes the following contents: the nature of the accident, the load of the main transformer and the summary of fault information;

Among them, the nature of the accident is automatically generated according to the faults artificially set in the dispatcher training simulation system, and the manual editing function of the dispatcher is opened;

The above-mentioned main transformer load information provides information on the main transformer load of relevant stations affected by the accident within the jurisdiction of the regional power supply company; the system load before the accident is calculated according to the predicted summer peak load of the year given by the transport party; the accident forecast Apply the imported power flow section as the basic data model to calculate the power flow changes of all standby automatic switching devices after the operation, and output the load rate of all relevant substations;

The summary of the fault information is in the form of a table, which summarizes relevant important information after the fault occurs; the relevant important information includes self-cutting conditions, main transformer load, overloaded lines, affected plants and important users.

Specifically, for the "self-cutting situation", the ground dispatching support system outputs relevant information about the self-cutting device of all actions after the fault occurs;

For the "main transformer load", the ground dispatching support system outputs all the load rates of the main transformers in the station where the accident occurred to the text;

For the "overloaded line", the local dispatching support system reads the imported power flow section, calculates the power flow change of the power grid, and outputs the name of the line whose load rate exceeds 80%;

For the "affected power station", in the process of grid power flow calculation, the ground dispatching support system will traverse the power failure situation of all associated subordinate stations of the power station where the accident occurred, and according to the electrification situation of the topology bus and Action record, to distinguish whether the subordinate station is instantaneously or permanently out of power, and output the result to the two parts of the affected station and the full stop station;

For the "important users", the ground dispatching support system outputs all relevant important user information according to the situation of the full stop line; the described ground dispatching support system creates an "important user information table" Function to feed back all relevant important user information to the dispatcher, so that the dispatcher can maintain relevant important user information of the power grid under his jurisdiction, and check the impact range of the power outage line when the accident is expected.

In the technical scheme of the present invention, in the ground dispatching support system, the openness of the maintenance function of the standby self-commissioning model enables the research grid under the static security analysis and dispatcher simulation training environment to be closer to the real situation of the grid, For dispatchers to scientifically and accurately analyze network power flow distribution, improve the analysis and processing capabilities of power grid accidents;

The power flow calculation mentioned in it embeds the standby automatic switching function. The calculation of the load transfer not only considers the actual operation of the standby automatic switching device, but also takes into account the load transfer situation of the model outside the system, which improves the original power flow calculation. Accuracy, so that the calculation results can better reflect the power flow distribution of the real power grid, and have more practical and reference value for dispatchers;

The accident prediction support function described in it can quickly output information about hypothetical faults of the power grid that dispatchers care about, and calculate and count information such as equipment load rate, equipment power-off status, and important users, which greatly reduces the dispatcher’s workload. Reduce workload and improve work efficiency.

Compared with prior art, the advantages of the present invention are:

1. By setting up the automatic switching model of the equipment and providing the action simulation function of the automatic safety device of the equipment, this technical solution realizes the simulation application of the equipment and automatic switching in the static safety analysis environment; the model maintenance function is opened; it can realize the power supply of important power users Continuity analysis; realize the dispatcher accident prediction support function;

2. By providing the action simulation function of the automatic safety device for standby and automatic switching, the dispatcher can independently maintain the standby and automatic switching model, and freely set the operation mode of the standby and automatic switching device, so as to facilitate the simulation and analysis of the power flow distribution under different operating modes, so that Dispatchers can conduct real-time, online research on the safety and stability of the regional power grid, and improve their emergency response capabilities for power grid accidents;

3. The power flow calculation is embedded in the standby automatic switching function. The calculation of the load transfer not only considers the actual operation of the standby automatic switching device, but also takes into account the load transfer situation of the model outside the system, which improves the original power flow calculation. Accuracy, so that the calculation results can better reflect the power flow distribution of the real power grid, and have more practical and reference value for dispatchers.

Description of drawings

Fig. 1 is a schematic flow chart of the action logic of a single standby automatic switch in the present invention;

Fig. 2 is the flow calculation flow chart of the present invention considering the automatic switching action of equipment;

Fig. 3 is a schematic diagram of the static security analysis initial state value-taking method of the present invention;

Fig. 4 is a schematic diagram of the synchronization flow of the self-injection model among multiple platforms in the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Figure 1, in order to correctly simulate the action of the standby automatic switching device in the static security analysis, it is necessary to formulate the correct standby automatic switching action logic. The action logic of a single standby automatic switching device in the technical solution of the present invention is as follows:

First, judge whether the main power supply is out of power, if it is out of power, enter the next step of judgment, otherwise end;

Secondly, judge whether the backup power supply is live, if it is charged, enter the next step of judgment, if it is not charged, all power supplies are effective, and the standby self-switching action is meaningless, so the judgment ends;

Third, judge whether the current operation mode meets the action requirements of standby automatic switching. The operation mode needs to be set in the standby automatic switching model maintenance function. If it is satisfied, then the standby automatic switch meets the action condition and takes action, otherwise the judgment ends.

In Fig. 2, after the standby automatic switching device is embedded, the power flow calculation of the static security analysis will consider the action of the standby automatic switching, and the specific method or process is as follows.

First of all, based on the ground state power flow, the static security analysis shuts down the disconnecting equipment in the power system and starts the network topology. During the topology process, it is judged which standby automatic switching devices meet the action conditions, and these devices are screened out.

After the screening is completed, select the one or a batch of devices with the shortest action time among all qualified automatic switching devices to perform switching operations, and block these activated automatic switching devices after completion.

After a round of backup auto-switching action, the static security analysis software restarts the network topology, checks the disconnection devices in the network, and detects whether there is a backup auto-switching device that meets the action conditions. If there is a corresponding device, repeat the previous action. Until there is no load action condition for the automatic switching device.

Finally, the static safety analysis performs power flow calculations and outputs the results.

Fig. 3 shows the way of obtaining the initial state of the static security analysis in the technical solution of the present invention.

In this technical solution, the calculation of the power flow after the standby automatic switching operation and the output of the corresponding accident plan text are all realized in the static safety analysis module.

The standby automatic switching device of this technical solution is closely related to the following parts of the static security analysis.

1) Initial preparation

For safety analysis calculations, it is always carried out in an initial mode of operation. There are three initial methods to choose from: one is to take the real-time method, that is, the real-time operation method provided by state estimation; the other is to take the power flow method, which is a special method adjusted by the dispatcher; the third is to take the historical operation data (also known as Historical CASE), that is, the historical operation data method saved in the past. In the historical CASE method, the static security analysis can be retrieved from the system through the start date, end date and current application (generally select state estimation PAS_RTNET and dispatcher power flow PAS_DPFLOW) Save the CASE section, and read the relevant historical CASE section into the corresponding static security analysis research mode of the machine.

2) Operating parameter maintenance

● Power flow calculation parameters

The foundation of static security analysis is power flow calculation. On the power flow calculation parameter screen, operating parameters such as algorithm, convergence criterion, and unbalanced power distribution method can be set.

The balancing machine is the voltage phase angle reference point within the largest electrical island. The unbalanced power distribution method can be selected from the following four methods: balanced machine absorption, multi-machine capacity distribution, multi-machine coefficient distribution and multi-machine equal distribution. When the balance machine is selected to absorb, the unbalanced power of the grid (including power generation, load and network loss) will be absorbed by the balance machine. When the other three methods are used, the unbalanced power of the grid will be balanced by multiple generators. As for which generators participate in power regulation, it will be determined by the "participating in active power regulation" field of the generator meter. The unbalanced power distribution methods among multiple generators include capacity, coefficient and average. When selecting the capacity, it will be distributed according to the adjustable capacity of the generator. When selecting the coefficient, it will be distributed proportionally according to the coefficient manually set. When selecting the average, the unbalanced power will be distributed evenly. During the distribution process, ensure that the output of the generator is within the range of maximum output and minimum output.

Set generator parameters, including node type (balance node, PQ node, PV node, etc.). For PV nodes, you can set whether to control the terminal voltage or the high-voltage side bus voltage and the target voltage value for control. For those participating in active power regulation according to the specified coefficient The unit can set the proportional coefficient.

●Customized monitoring power section

After the static safety analysis ends the analysis of each break, in addition to checking the limit violation of individual equipment such as line current, transformer capacity, generator output and bus voltage, it also monitors the active power of the stable section composed of lines and transformers. Generally important stable sections have been uniformly set by SCADA and used directly in safety analysis. In addition to these stability sections, some monitoring sections can also be defined during safety analysis.

●Equipment limit alarm setting

Static security analysis provides equipment limit alarm function. During the periodical operation of real-time mode security analysis, if a certain device exceeds the limit in several consecutive disconnection calculations, the limit violation of these devices can be registered in the alarm by setting window for future inquiries. Set whether to alarm when five different types of equipment, such as "line current alarm", "transformer power alarm", "generator output alarm", "bus voltage alarm" and "stable section alarm" exceed the limit, and then set the device to log in when the limit is exceeded The alarm requires the number of consecutive limit violations. When a certain type of limit violation alarm is set to "Yes", and the number of consecutive limit violations during the period calculation process is equal to the set limit violation times, the device that exceeds the limit will be registered in the alarm window.

3) Calculation result analysis

After the technical solution successfully embeds the standby automatic switching function into the static security analysis, its calculation result can accurately reflect the power flow change after the standby automatic switching operation, and the calculation result loads the real situation of the power grid accident.

After a complete safety analysis is completed, the static safety analysis will output a "limit violation statistics table", which can query and analyze the limit violation conditions of equipment and sections. The limit violation conditions of each breaking fault will be listed in the table, including the following Attributes:

Breaking type: Refers to line N-1, transformer N-1, generator N-1, bus N-1 or self-defined faults.

Factory station name: when N-1 is disconnected, it refers to the description of the factory station to which the disconnecting device belongs, and this item is empty when a user-defined fault occurs.

Device name: when N-1 is broken, it refers to the description of the specific breaking device, and when the fault is customized, it means the name of the fault group.

Breaking result: display as over limit, power failure, etc.

Out-of-limit elements: The current out-of-limit quantity is the sum of the following lines, transformers, generators, busbars and cross-section out-of-limit quantities.

Over-limit cross-section: the number of cross-limit active cross-sections that are currently disconnected.

Out-of-limit lines: The number of current-off-limit lines that are currently disconnected.

Out-of-limit transformers: The number of transformers that are currently disconnected exceeds the limit.

Over-limit generators: The number of output generators that are currently disconnected exceeds the limit.

Over-limit busbar; the number of over-limit busbar voltages currently disconnected.

Severity indicator: reflects the severity of the system after the current disconnection.

In addition to giving an overview of breaking limit violations, the static security analysis also provides detailed limit violation statistics for each device (section), including the name of limit violations, the number of limit violations, and the maximum breaking device (in multiple different breaking situations). Corresponding to the breaking device with the worst limit violation), the maximum limit violation value (corresponding to the limit violation value when the limit violation is the most serious under multiple different breaking conditions), the maximum limit violation rate (corresponding to The limit violation rate when the limit violation is the most serious).

In Fig. 4, the technical solution adopts the file interaction mode to realize the synchronization of the backup and self-injection model among multiple platforms.

The core of the technical solution is to realize the backup auto-switching function, which needs the support of the backup auto-switching model.

The standby self-transition model mainly involves two issues: one is on which platform to develop the maintenance function of the standby self-transition model, and the other is that since the application will be embedded in multiple platforms of the power system, it is necessary to determine the backup self-transition model between multiple platforms synchronization method.

1) Determine the maintenance platform for the standby self-injection model

In practice, the normal action of the standby automatic switch may be blocked by some protections, and some protections will also be blocked after the standby automatic switch is activated. In order to truly simulate this realistic situation, the application must have the configuration functions of "protection blocking standby automatic switching" and "standby automatic switching blocking protection", and this function needs the support of the protection device model. In order to avoid the heavy amount of secondary protection and maintenance, it is determined to construct the maintenance function of the equipment self-injection model on the DTS workstation.

2) Interfaces and tools for the maintenance of the standby self-injection model

This technical solution provides two interfaces for the dispatcher to independently maintain the backup and self-introduction model. The first interface is the main console of the dispatcher training simulation system workstation; the second interface is the static security analysis interface of the workstation of the power management system workstation.

The above interfaces 1 and 2 provide dispatchers with a maintenance tool "Protection Model Maintenance Tool". The basic principles are as follows:

First, the information of the standby automatic switching device is configured based on the factory station. If the current factory station does not exist, you need to add the factory station first.

Second, after perfecting the plant information, further configuration can be performed on the corresponding standby automatic switching devices of each plant.

Thirdly, through the maintenance tool, the user can configure the following backup automatic switching information, including: 1. The action time and operation status of the standby automatic switching device, which can input the start time of each backup automatic switching device and select the corresponding Whether to invest. The second is the main power supply information of the standby self-switching, and the main power supply information of the relevant equipment is added to the tool. The third is the backup power information, add the backup power of related equipment. The fourth is the option of "checking the backup power supply", so that the backup automatic switching device will first check whether the backup power supply is powered before deciding whether the backup automatic switching device will operate when the main power supply fails. The fifth is the mode switch information, which sets the operation mode of the automatic switching device under normal conditions, that is, the operation mode when no accident is expected. The sixth is the action switch information, which selects the switch action situation after the expected accident occurs and the automatic switching action occurs.

3) The multi-platform synchronization method of the standby self-injection model

The project application will be embedded with two modules of DTS and static security analysis. Since DTS and static security analysis belong to the security zone II and the security zone I respectively, there is a firewall between the two security zones. If the model interaction is implemented through the database, before each calculation, it is necessary to query and compare whether the model in the commercial library is consistent with the current model, which takes a long time and is inefficient. After comprehensive consideration, the project decided to realize the synchronization of the backup self-injection model between multiple platforms in the form of file interaction.

The synchronization process of the above backup model between multiple platforms is as follows:

First, on the DTS workstation, the maintenance of the standby automatic switching device is realized through the standby automatic switching maintenance interface.

Second, after the backup self-commissioning model of DTS is changed, it will automatically import the current backup self-commissioning model into the XML file and send it to the master and backup machines for static security analysis.

Third, a specific program is set to monitor the XML file in the static security analysis, and if the export time in the XML file is found to be newer than the model time of the current model, the XML file is automatically imported into the static security analysis model.

"Important users" refer to those who occupy an important position in the social, political, and economic life of a country or a region (city), and interruption of power supply to them may cause personal casualties, greater environmental pollution, greater political influence, and greater economic losses , Power consumers with serious social and public disorder or power consumers with special requirements for power supply reliability. According to the current power outage consequences of different types of important power users, important power users are divided into two categories: social and industrial, and industrial is divided into four categories: coal mines and non-coal mines, hazardous chemicals, metallurgy and electronics, and manufacturing; social The categories are divided into 8 categories: party, government, judicial organs and international organizations, radio and television, communications, information security, public utilities, transportation, medical and health care, and densely populated places.

For important users, in addition to the relevant regulations on power supply configuration and self-contained emergency power configuration, there are also high requirements on accident emergency handling. If the power grid accident involves important users, the power supply company should arrange an accident rescue team as soon as possible according to the emergency plan formulated in advance, and rush to the accident site to organize emergency repairs. The accident analysis and handling capabilities of dispatchers are also required to be higher.

In order to enable the dispatcher to grasp the range of important users that may be affected after the power grid accident occurs, this technical solution provides an analysis function for the continuity of power supply of important users, which can be based on the power failure status of the power supply equipment (instantaneous power loss or permanent power loss) , classify and output relevant important user information to the auxiliary text of accident prediction for dispatcher's reference.

The specific principles are as follows:

First of all, this technical solution establishes an important load user mapping table under the database module, and this table is used as the initial configuration of the power supply continuity analysis of important users.

The load transfer table mainly includes the following attributes:

Load name, line name, winding name: You can choose whether the power supply equipment associated with important users is a load line, an AC line or a transformer.

Number of important users: the number of important users associated with the power supply equipment.

User 1, User 2 and other columns: important user names

Secondly, this technical solution judges the power supply equipment that will lose power instantaneously or permanently according to the static safety analysis of the power flow results before and after the disconnection and the action information of the backup self-switching.

Third, the technical solution outputs relevant important user information of power-off equipment according to the association relationship between power supply equipment and important users in the important user mapping table.

Dispatcher accident prediction support function of this technical solution:

In the static safety analysis (SA) scanning of expected faults, this technical solution adds the analysis function of standby automatic switchover action to realize N-1 scanning after standby automatic switchover action, and generates accident prediction text based on the analysis results. This function will facilitate scheduling The personnel can carry out accident prediction work, and get more accurate and usable calculation data.

Starting from the actual work, the accident prediction is mainly divided into the following four components: the operation situation before the accident, the analysis of the accident situation, the accident handling in the station and the accident handling of the affected stations.

1) For "Operation before the accident", the application will check the current operation mode of all main transformers in a specific substation and output the corresponding results, such as "two main transformers in XX station are fully connected and running".

2) For the parts of "Accident Handling in Station" and "Accident Handling of Affected Plants and Stations", because these two parts have too high requirements on the intelligence of the dispatching support system, due to the consideration of safety and the limitations of the system itself, it is necessary to follow the "City Region According to regulations such as the Operating Regulations for Power Grid Dispatching and the Supplementary Regulations on Strong Power Transmission in Municipal Power Grids, the dispatcher will handle the corresponding accidents according to the current power grid situation and data information.

3) The main research object of accident prediction application is "accident situation analysis", which includes the following contents.

●The nature of the accident

The application will be automatically generated according to the artificially set faults under DTS, and the manual editing function of the dispatcher is open.

●Main transformer load

This technical solution provides information on the main transformer load of relevant stations affected by the accident within the jurisdiction of the power supply company. The system load before the accident is calculated according to the predicted summer peak load of the year given by the transport party.

This technical solution uses the imported power flow section as the basic data model to calculate the power flow changes of all standby automatic switching devices, and output the load rate of all relevant substations.

●Summary of fault information

Accident prediction requires summarizing relevant important information after the occurrence of a fault and giving relevant information.

For "1 self-cutting situation", this technical scheme outputs the relevant information of all active self-cutting devices after a fault occurs; for "2 main transformer load", this technical scheme outputs the load rate of all main transformers in the accident site to Text; for "3 overloaded lines", this technical solution will read the imported power flow section, calculate the power flow change of the power grid, and output the name of the line with a load rate exceeding 80%; During the calculation process, this technical solution will traverse the power failure conditions of all associated subordinate stations of the plant station where the accident occurred, and distinguish whether the subordinate station is instantaneously power-off or permanently power-off according to the electrification status and action records of the topological bus, and output the result To the two parts of the affected station and the full stop station; for the "5 important users", this technical solution will output all relevant important user information according to the situation of the full stop line; The "Important User Information Table" function has been created to facilitate dispatchers to maintain relevant important user information of the power grid under their jurisdiction, and to check the scope of influence of power outage lines when accidents are anticipated.

The technical scheme of the present invention realizes the simulation application of standby automatic switching in the static security analysis environment; opens up the model maintenance function; realizes the power supply continuity analysis of important power users; realizes the dispatcher accident prediction support function, and can flexibly customize the automatic switching The operating mode of the switching device can quickly maintain the standby automatic switching model, which can further improve the work efficiency of the dispatcher.

The technical scheme of the present invention enables the dispatcher to independently maintain the standby self-switching model, freely set the operation mode of the equipment self-switching device, so as to facilitate the simulation and analysis of the distribution of power grid power flow under different operation modes, and enable the dispatcher to real-time and online Conduct research on the safety and stability of the regional power grid, and improve its emergency response capabilities for power grid accidents.

In the technical solution of the present invention, the openness of the maintenance function of the standby self-injection model enables the research grid under the static security analysis environment to be closer to the real situation of the grid, enables the dispatcher to scientifically and accurately analyze the network power flow distribution, and improves the analysis and handling of grid accidents Ability to better carry out actual combat drills has laid a solid foundation.

The standby automatic switching function is embedded in the power flow calculation. The calculation of the load transfer not only considers the actual operation of the standby automatic switching device, but also takes into account the load transfer situation of the model outside the system, which improves the accuracy of the original power flow calculation and enables The calculation results can better reflect the power flow distribution of the real power grid, and have more practical and reference value for dispatchers.

The accident prediction support function can quickly output information about hypothetical faults of the power grid that dispatchers care about. These data used to take a lot of time. The emergence of project applications has filled this gap well. Its calculation and statistics of information such as equipment load rate, equipment power-off status, and impact on important users have greatly reduced the workload of dispatchers and improved work efficiency. .

The invention can be widely used in the field of power grid monitoring intelligent dispatching system of regional electric power dispatching system.

Claims (6)

1. it is a kind of to improve the ground key degree support system that dispatcher analyzes disposal ability when accident occurs, including online static state Safety analysis module, is characterized in that：

In described online static security analysis module, a prepared auto restart model is set, there is provided prepared auto restart automatic safety device Action simulation function；

Wherein, in described ground key degree supports that the online static security analysis module of system is scanned to forecast failure, increase standby Motion analyses function is hauled oneself willingly into, the N-1 scannings after prepared auto restart action is realized, the trend after prepared auto restart action is calculated, with The power flow changing after prepared auto restart action is accurately reflected, and prediction failure text is generated based on analysis result；

When N-1 scannings are carried out using described online static security analysis module, dispatcher can independently arrange prepared auto restart dress The method of operation put, adjusts the security and stability of dispatcher's real-time online ground-to-ground area's electrical network to be studied with enabling, and improves real-time The security and stability of online study electrical network, and available prediction failure text is generated for dispatcher, to improve dispatcher for electricity The emergency disposal ability of net accident；

Ground key degree described in which supports system, realizes prepared auto restart automatic safety device action under static security analysis environment The application of analog functuion；The opening of its prepared auto restart model maintenance function, enables dispatcher's independence maintenance prepared auto restart model, The method of operation of backup auto-activating device is freely set, can be closer to electrical network truth；

In described ground key degree support system, the opening of the prepared auto restart model maintenance function, make static security analysis and Research electrical network under dispatcher's analogue simulation Training Environment can improve dispatcher's power grid accident closer to electrical network truth Analyzing and processing ability, with more practical and reference value for dispatcher；The confession for realizing important power consumers is electrically continuous Property analysis；Realize dispatcher's prediction failure and support function；

Described prediction failure supports function, can the imaginary failure relevant information of electrical network that quickly output scheduling person is concerned about, to setting The counting statistics of standby load factor, equipment power failure state and impact responsible consumer information, largely alleviates dispatcher's Work load, improves work efficiency.

2. the ground key degree for analyzing disposal ability when accident occurs according to the improved dispatcher described in claim 1 supports system System, is characterized in that described prepared auto restart automatic safety device action simulation function includes the action logic of single backup auto-activating device, The action logic of its single backup auto-activating device is as follows：

First, it is determined that main power source whether dead electricity, if dead electricity, judges into next step, otherwise terminates；

Secondly, judge whether stand-by power supply is powered, judge into next step if powered, if not charged, all power supplys Equal actual effect, prepared auto restart action are meaningless, terminate to judge；

3rd, judge whether the current method of operation meets the action request of prepared auto restart, the method for operation is needed in prepared auto restart mould Complete to arrange in type maintenance function；If it is satisfied, then prepared auto restart meets operation condition, action is carried out, otherwise judge to terminate.

3. the ground key degree for analyzing disposal ability when accident occurs according to the improved dispatcher described in claim 1 supports system System, is characterized in that described ground key degree supports system, in static security analysis module, before safety analysis calculating is carried out, There are three kinds of initial modes available：

One is to take real-time mode, i.e., the real time operation mode that state estimation is provided；

Two is to take trend mode, i.e., by way of dispatcher adjusts trend；

Three is the history run mode for taking conventional preservation, and under the history run mode for taking conventional preservation, static security analysis can The data section of system preservation is transferred with by from date, Close Date and current application, and relevant historical data is broken Read in the corresponding static security analysis research mode of ground key degree support system in face.

4. the ground key degree for analyzing disposal ability when accident occurs according to the improved dispatcher described in claim 1 supports system System, is characterized in that described prepared auto restart model between multi-platform using following synchronous method：

A, on the work station of dispatcher training system system, dimension to backup auto-activating device is realized by prepared auto restart maintenance interface Shield；

After B, the prepared auto restart model of dispatcher training system system change, automatically current prepared auto restart model can be imported to In XML file, and it is sent in the standby machine of static security analysis；

C, the derivation time in static security analysis module, arranging monitoring programme monitoring XML file, if it find that XML file In to derive the time newer than the model time of "current" model, then XML file is imported to the model of static security analysis automatically In.

5. the ground key degree for analyzing disposal ability when accident occurs according to the improved dispatcher described in claim 1 supports system System, in it is characterized in that described ground key degree supports that the static security analysis module of system is scanned to forecast failure, increased for certainly Motion analyses function is thrown, the N-1 scannings after prepared auto restart action is realized, and prediction failure text is generated based on analysis result, with Facilitate dispatcher to carry out prediction failure work, and obtain more accurate available calculating data；

Wherein, described prediction failure work includes following 4 ingredients：Before accident, ruuning situation, accident conditions are analyzed, are stood Interior accident treatment and impacted plant stand accident treatment；

1) for " ruuning situation before accident ", prediction failure work will check the current operation side of all main transformers of particular substation Formula, and export accordingly result；

2) for " stand in accident treatment " and " impacted plant stand accident treatment " part, prediction failure work according to《City area electricity Net scheduling operation code》With《The strong power transmission supplementary provisions of utility grid》Regulation, by dispatcher according to current electric grid situation and data Information, is processed to corresponding accident；

3) for " accident conditions analysis ", prediction failure work includes herein below：Nature of occurence, main transformer load condition and failure Information collects；

Wherein, described nature of occurence is automatically generated according to the artificial failure for arranging in dispatcher training system system, and open Dispatcher's manual editing's function；

Described main transformer load condition provides the associated station main transformer load letter in local power supplying companies bureaus' compass of competency by accident impact Breath；The summer peak of the prediction then carry calculation that system loading is given by fortune side before accident therein；Described prediction failure work with The trend section of importing is master data model, calculates the change of the electric network swim after all backup auto-activating device actions, and exports The load factor situation of all related transformer stations；

Fault message described in which collects in table form, collects the related important information after failure occurs；Described correlation Important information includes the situation of autotomying, main transformer load, overload circuit, impact plant stand and responsible consumer.

6. the ground key degree for analyzing disposal ability when accident occurs according to the improved dispatcher described in claim 5 supports system System, is characterized in that, for described " situation of autotomying ", described ground key degree supports system, everything after output failure generation From cutting apparatus relevant information；

For system is supported in described " main transformer load ", described ground key degree, be there are into all main transformer loads of plant stand in accident Rate situation is exported to text；

For described " overload circuit ", described ground key degree is supported system, reads the trend section for importing, calculate electrical network Power flow changing situation, the line name output by load factor more than 80%；

For described " impact plant stand ", during electric network swim is calculated, described ground key degree supports system, will traversal There is the dead electricity situation of the relevant subordinate station of plant stand institute in accident, and according to the powered situation and action record of topological bus, differentiation The subordinate station is instantaneous dead electricity or permanent dead electricity, and result is exported to impact station and full cut-off station two parts；

For described " responsible consumer ", described ground key degree is supported system, according to the situation of full cut-off circuit, exports which related All responsible consumer information；Described ground key degree supports system by creating " responsible consumer information table " function, by correlation All responsible consumer feedback of the information to dispatcher, to facilitate dispatcher safeguard the related responsible consumer letter of administrative electrical network Breath, and the coverage of dead line is checked in prediction failure.