CN105071399B - Voltage and reactive power coordinated control system based on interaction and coordination of primary and distributed networks - Google Patents

Abstract

The invention discloses a comprehensive voltage and reactive power control system based on the interaction and coordination of main and distribution networks, including: a three-level coordinated distribution network AVC control system and a distribution network reactive voltage analysis and evaluation system; a three-level coordinated distribution network The AVC control system is installed on the distribution network real-time operation service platform; the distribution network reactive voltage analysis and evaluation system is installed on the distribution network unified service platform; the three-level coordinated distribution network AVC control system communicates with the real-time data soft bus The SCADA, EMS, distribution transformer on-load tap, distribution transformer reactive power compensation device, line voltage regulator and line reactive power compensation device in the power system are connected separately; the reactive power and voltage analysis and evaluation system of the distribution network runs through the distribution The model information interaction bus is connected to the PMS system, PI interface and power consumption information collection system respectively. Beneficial effects of the present invention: the system of the present invention can effectively manage reactive voltage equipment and monitor the voltage qualification rate.

Description

Integrated voltage and reactive power control system based on interaction and coordination of main and distribution networks

technical field

The invention belongs to the technical field of distribution network energy saving, and in particular relates to a comprehensive voltage and reactive power control system based on the interaction and coordination of main and distribution networks.

Background technique

Voltage is one of the important indicators of power quality. The quality of voltage determines the safe and economical operation of the power system, as well as the performance, production efficiency and product quality of electrical equipment; "Notice on the Standards of Voltage Qualification Rate and Residential Users' Receiving Terminal Voltage", which clarifies the standard of voltage qualification rate and puts forward higher requirements for controlling low voltage and improving voltage qualification rate.

The medium and low voltage power grids in the county area widely adopt the tree-shaped, multi-branch unidirectional radiation power supply mode. The characteristics of these lines are: long power supply radius, low power factor, poor terminal voltage quality, and large line loss; the problem of unqualified voltage of the existing distribution network is becoming more and more serious. Too high or too low terminal voltage will cause some household appliances (such as air conditioners, computers, etc.) Necessary economic loss.

Contents of the invention

The purpose of the present invention is to solve the above problems, and proposes a voltage and reactive power integrated control system based on the interaction and coordination of the main and distribution networks. The system can effectively control reactive voltage equipment and monitor the voltage qualification rate.

In order to achieve the above object, the present invention adopts the following technical solutions:

A comprehensive voltage and reactive power control system based on the interaction and coordination of main and distribution networks, including: a three-level coordinated distribution network AVC control system and a distribution network reactive power and voltage analysis and evaluation system;

The three-level coordinated distribution network AVC control system is installed on the distribution network real-time operation service platform and runs in the safe area I; the distribution network reactive power and voltage analysis and evaluation system is installed on the distribution network unified service platform and runs in the safe zone. Ш area; the AVC control system of the three-level coordinated distribution network communicates with SCADA, EMS, distribution transformer on-load taps, distribution transformer reactive power compensation devices, line voltage regulators and line reactive power in the power system through real-time data soft bus The compensation devices are connected separately; the reactive power and voltage analysis and evaluation system of the distribution network is connected with the PMS system, the PI interface and the power consumption information collection system through the power distribution operation model information interaction bus;

The AVC system of the three-level coordinated distribution network transmits the operating data to the reactive power and voltage evaluation system of the distribution network through the forward physical isolation device, which is convenient for evaluating the closed-loop control scheme of the reactive power and voltage equipment.

The three-level coordinated distribution network AVC control system includes: a main network AVC system, a distribution network AVC system, a distribution network monitoring system, a reactive voltage equipment monitoring module, a distribution network visualization module and a distribution network simulation module.

The reactive power and voltage analysis and evaluation system of the distribution network includes:

Reactive power and voltage intelligent evaluation module: take the substation as the organizational structure, take the main and distribution network feeder as the basic analysis unit, and analyze the cause of the voltage quality problem caused by each feeder;

Reactive voltage equipment monitoring module: used to monitor the operating status of reactive voltage equipment in the set area;

Voltage pass rate monitoring module: used to collect real-time data from the voltage monitoring system or a separate voltage monitor device, power consumption information collection system, and SCADA to detect the voltage pass rate;

Comprehensive optimization and transformation module: used to evaluate reactive voltage equipment offline or online.

Reactive power compensation optimization configuration module: used to calculate the optimal configuration of the entire network according to the main and distribution network structure and actual load conditions;

AVC operation benefit analysis module: It is used to analyze and evaluate the operation benefit of the AVC system through the comprehensive analysis of the power grid operation data, equipment action, equipment control status and AVC instruction records.

The reactive power and voltage intelligent evaluation module respectively retrieves the actual load data of the grid, the grid model data, and the detection results of the voltage qualification rate monitoring module, and performs online power flow calculation for the feeder with unqualified voltage; the power flow calculation result is generated by a single transformer node The situation is calculated to the situation of each node of the power grid, so as to more comprehensively display the low voltage situation of the power grid.

The voltage pass rate monitoring module calculates the voltage pass rate specifically includes:

1) For the transformer level in the station area:

Among them, Transformer _1i represents the voltage qualification rate of the i-th distribution transformer; _{tqualification} is the voltage qualification time, and _tdetection is the total time of voltage monitoring;

2) For the feeder level:

Among them, Transformer _2i represents the voltage qualification rate of the i-th distribution transformer, n represents the number of distribution transformers in the feeder, 0<i<n; Line _j represents the voltage qualification rate of the j-th feeder line;

3) For the area/substation level:

Zone _i = 0.5A+0.5(B+C+D)/3;

Among them, Zone _i represents the voltage qualification rate of the i-th substation power supply unit or a certain zone, A is the comprehensive voltage qualification rate of 10 and 20kV medium voltage buses, B is the comprehensive voltage qualification rate of 35kV and above large users, C is the main transformer and 10kV distribution Variable comprehensive voltage qualification rate, D is the comprehensive voltage qualification rate of low-voltage users.

The specific work process of the comprehensive optimization transformation module includes:

Step S1, obtain the offline distribution transformer power data, or obtain the real-time data of the distribution transformer station area from the power consumption information collection system, and perform normalization processing on the obtained data to form a basic data platform;

Step S2, retrieve the voltage qualification rate data of each feeder and substation fed back online by the voltage qualification rate monitoring module, conduct statistical analysis on the scope of the power grid and node voltage qualification rate, and obtain the current key nodes with voltage quality problems in the power grid and the degree of voltage unqualification;

Step S3, retrieve the analysis results of the voltage quality problems of each feeder and substation fed back online by the reactive voltage intelligent evaluation module, and clearly display the voltage unqualified range from the distribution transformer node to the power grid;

Step S4, after obtaining the analysis results of the low-voltage problem in the power grid, quantify the typical power grid rectification plan, and establish a mathematical model of investment effectiveness, take the ratio of the investment in the optimization plan to the optimal voltage value as the objective function, and select a typical optimization algorithm to solve the target The optimal solution of the function makes the investment minimum and the return maximum.

The reactive power compensation optimization configuration module uniformly controls the reactive power and voltage control optimization device in the power grid according to the unqualified degree and occurrence position of the generated voltage and power factor in the power grid:

The basic control principle is based on the minimum action range and number of actions of the device. In the case of low voltage in a small area or a single location, the local reactive power and voltage equipment will act independently; Cooperate with reactive power and voltage equipment in individual places to act independently.

The beneficial effects of the present invention are:

1. The system of the present invention can effectively manage reactive voltage equipment and monitor the voltage qualification rate. Realized the whole process of computer intelligent system from real-time reactive power and voltage analysis and evaluation, signal acquisition, optimization to instruction execution.

2. Provide a complete and comprehensive auxiliary analysis and decision-making system for all aspects of reactive power and voltage management, including operation measures, transformation measures, new power supply locations and management measures.

3. The invention satisfies the requirements of economical operation of the distribution network, optimization of voltage quality, improvement of power factor, loss reduction and energy saving, and the like.

Description of drawings

Fig. 1 is a schematic structural diagram of the system of the present invention;

Fig. 2 is a structural diagram of the reactive power and voltage analysis and evaluation system of the distribution network of the present invention.

detailed description:

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1, the integrated voltage and reactive power control system based on the interaction and coordination of the main and distribution networks mainly includes a three-level coordinated distribution network AVC control system with enhanced functions and a reactive power and voltage analysis and evaluation system for the distribution network.

The three-level coordinated distribution network AVC control system with enhanced functions is installed on the distribution network real-time operation service platform and runs in the safety area I, including the main network AVC system and the distribution network AVC system. In addition to the traditional distribution network monitoring function , also added reactive voltage equipment monitoring module, distribution network visualization module, distribution network simulation module, etc.

The real-time data soft bus in safety zone I and SCADA (data acquisition and monitoring control system), EMS (network element management system) in the power system, distribution transformer on-load tap, distribution transformer reactive power compensation device, line voltage regulator, The line reactive power compensation device is connected.

As shown in Figure 2, the reactive power and voltage analysis and evaluation system of the distribution network is installed on the unified service platform of the distribution network and operates in a safe area. , Distribution network model. Equipment parameters and operating data, complete reactive voltage analysis and evaluation functions. It mainly includes reactive power and voltage intelligent evaluation module, reactive power and voltage equipment management module, voltage qualification rate monitoring module, comprehensive optimization and transformation module, reactive power compensation optimization configuration module and AVC operation benefit analysis module.

Among them, (1) reactive voltage intelligent evaluation module, the basic principle of this module is as follows:

Taking the substation as the organizational structure and the main and distribution network feeders as the basic analysis unit, through optimization algorithms and measured data, analyze the causes of voltage quality problems caused by each feeder, such as too long lines, too thin wire diameters, insufficient reactive power compensation, etc. .

(2) Reactive voltage equipment management module, the basic principles of this module are as follows:

For reactive power and voltage equipment within the jurisdiction of district and county power supply companies, including transformers and capacitors in substations, line reactive power compensation on feeders, line voltage regulators, reactive power compensation for distribution transformers, on-load voltage regulation and distribution transformers and other equipment for monitoring and analysis.

(3) Voltage qualification rate monitoring module, the basic principle of this module is as follows:

According to the real-time data obtained from the voltage monitoring system or a separate voltage monitoring device, power consumption information acquisition system, and SCADA, the voltage qualification rate is monitored.

The methods for calculating the voltage qualification rate specifically include:

1) For the transformer level in the station area:

Among them, Transformer _1i represents the voltage qualification rate of the i-th distribution transformer; _{tqualification} is the voltage qualification time, and _tdetection is the total time of voltage monitoring;

2) For the feeder level:

Among them, Transformer _2i represents the voltage qualification rate of the i-th distribution transformer, n represents the number of distribution transformers in the feeder, 0<i<n; Line _j represents the voltage qualification rate of the j-th feeder line;

3) For the area/substation level:

Zone _i = 0.5A+0.5(B+C+D)/3;

Among them, Zone _i represents the voltage qualification rate of the i-th substation power supply unit or a certain zone, A is the comprehensive voltage qualification rate of 10 and 20kV medium voltage buses, B is the comprehensive voltage qualification rate of 35kV and above large users, C is the main transformer and 10kV distribution Variable comprehensive voltage qualification rate, D is the comprehensive voltage qualification rate of low-voltage users.

(4) Comprehensive optimization and transformation module, this functional module is a separate software that can be used for offline and online reactive power and voltage analysis and evaluation.

The basic principles of this module are as follows:

Step S1, obtain the offline distribution transformer power data, or obtain the real-time data of the distribution transformer station area from the power consumption information collection system, and perform normalization processing on the obtained data to form a basic data platform;

Step S2, retrieve the voltage qualification rate data of each feeder and substation fed back online by the voltage qualification rate monitoring module, conduct statistical analysis on the scope of the power grid and node voltage qualification rate, and obtain the current key nodes with voltage quality problems in the power grid and the degree of voltage unqualification;

Step S3, retrieve the analysis results of the voltage quality problems of each feeder and substation fed back online by the reactive voltage intelligent evaluation module, and clearly display the voltage unqualified range from the distribution transformer node to the power grid;

Step S4, after obtaining the specific cause analysis results, it is necessary to formulate specific control measures. Due to the difficulty of implementing various control measures, the effect, the total amount of investment, and mutual influence, it is necessary to comprehensively analyze and compare to find a solution to the "low voltage" problem. key best practices. For a feeder line that needs to be improved, various improvement measures include: changing wire diameter, transformation of distribution transformer tap on-load voltage regulation, replacement of distribution transformer, installation of line voltage regulator, reactive power optimization configuration, etc.

Quantify the typical power grid rectification plan, and establish a mathematical model of investment effectiveness, take the ratio of the investment in the optimization plan to the optimal voltage value as the objective function, and select a typical optimization algorithm (such as particle swarm optimization, genetic algorithm, etc.) to solve the optimal value of the objective function solution to minimize investment and maximize returns.

(5) Reactive power compensation optimization configuration module, the basic principle of this module is as follows:

The reactive power compensation optimization configuration module calculates the optimal configuration of the entire network according to the structure of the main and distribution network and the actual load situation, and comprehensively considers investment, loss reduction and voltage regulation effects, and reactive power compensation for feeder lines and distribution transformers at the low-voltage side , giving the most reasonable configuration location, configuration capacity and grouping method. The reactive power and voltage control optimization device in the power grid is uniformly controlled according to the unqualified degree of voltage and power factor in the power grid and the location of occurrence. According to the principle of the minimum number of actions in the operating range of the device, local reactive power and voltage equipment act independently in individual low-voltage conditions, and the action in large-scale low-voltage conditions mainly considers the action of the device on the high-voltage bus side, and cooperates with individual local reactive power and voltage devices to solve low-voltage problems . Effectively solve the problem of unquantifiable configuration and unbalanced configuration caused by long-term use of empirical formulas for reactive power compensation calculations, effectively increase voltage regulation methods, increase voltage qualification rate, reduce network loss, improve grid stability and ensure wider operation margin.

(6) AVC operation benefit analysis module, the basic principles of this module are as follows:

If the district and county power supply companies have installed the main network AVC and distribution network AVC closed-loop control systems, the operating benefits of the AVC system can be evaluated through a comprehensive analysis of the power grid operation data, equipment actions, equipment control status, and AVC command records. Analyze and evaluate.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (6)

1. it is a kind of to it is characterized in that based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, including：Three-level is coordinated Power distribution network AVC control systems and electric distribution network reactive-voltage analysis and evaluation system；

The three-level is coordinated power distribution network AVC control systems and is installed on distribution real time execution service platform, runs on safe I areas； The electric distribution network reactive-voltage analysis and evaluation system is installed on distribution unitary service platform, runs on safe Ш areas；Described three Level coordination power distribution network AVC control systems are by SCADA, EMS, the distribution transforming loaded tap-off in real time data flexible bus and power system Head, distribution transforming reactive power compensator, circuit pressure regulator and reactive power compensation system device connect respectively；The electric distribution network reactive-voltage point Analysis assessment system is by distribution moving model information interactive bus and PMS systems, PI interfaces and power information acquisition system point Do not connect；

Three-level coordinates distribution AVC systems by positive physical isolation device, service data is sent to into electric distribution network reactive-voltage and is commented Estimate system, be easy to be estimated reactive voltage equipment close-loop control scheme；

The electric distribution network reactive-voltage analysis and evaluation system includes：

Reactive voltage intelligent evaluation module：It is right with master, distribution feeder as fundamental analysis unit with transformer station as organizational structure The reason for each feed line causes quality of voltage problem is analyzed；

Reactive voltage monitoring of equipment module：For being monitored to the running status of the reactive voltage equipment in setting regions；

Rate of qualified voltage monitoring modular：For collection voltages monitoring system or individual voltage monitoring instrument apparatus, power information collection System, the real time data of SCADA, detect to rate of qualified voltage；

Complex optimum transforms module：For being estimated to reactive voltage equipment in the case of offline or online；

Reactive power compensation ability configuration module：For carrying out network-wide optimization according to master, power distribution network electric network composition and actual load situation Configuration is calculated；

AVC analysis of operation benefit modules：For by operation of power networks data, the action situation of equipment, the controlled state of equipment With the comprehensive analysis of the instruction record of AVC, assessment is analyzed to the on-road efficiency of AVC systems.

2. as claimed in claim 1 a kind of based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, its feature It is that the three-level coordinates power distribution network AVC control systems to be included：Major network AVC systems, distribution AVC systems, monitoring system for power distribution networks, Reactive voltage monitoring of tools module, distribution visualization model and power distribution network emulation module.

3. as claimed in claim 1 a kind of based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, its feature It is that it is qualified that the reactive voltage intelligent evaluation module transfers respectively electrical network actual measurement load data, grid model data and voltage The testing result of rate monitoring modular, to there is the underproof feeder line of voltage online power flow calculating is carried out；By calculation of tidal current by Single transformator node situation is calculated to each node situation of electrical network, so as to more fully show electrical network low voltage situation.

4. as claimed in claim 1 a kind of based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, its feature It is that the rate of qualified voltage monitoring modular calculates rate of qualified voltage and specifically includes：

1) for platform area transformator aspect：

Wherein, Transformer_1iRepresent the i-th station power distribution transformer voltage qualification rate；t_{It is qualified}For voltage qualified time, t_DetectionFor electricity Pressure monitoring total time；

2) for feeder line aspect：

${\mathrm{Line}}_j=\frac{1}{n}*\underset{i=1}{\overset{n}{\&Sigma;}}{\mathrm{Transformer}}_{2i};$

Wherein, Transformer_2iThe i-th station power distribution transformer voltage qualification rate is represented, n represents distribution transformer number of units in feeder line, 0<i<n；Line_jRepresent jth platform feeder voltage qualification rate；

3) for section/transformer station's aspect：

Zone_i=0.5A+0.5 (B+C+D)/3；

Wherein, Zone_iI-th transformer station's power supply unit or certain subregion rate of qualified voltage are represented, A is that bus synthesis is pressed in 10,20kV Rate of qualified voltage, B is 35kV and above large user's integrated voltage qualification rate, and C is main transformer and 10kV distribution transforming integrated voltage qualification rates, D is low-voltage customer integrated voltage qualification rate.

5. as claimed in claim 1 a kind of based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, its feature It is that the specific work process of the complex optimum transformation module includes：

Step S1, obtains offline distribution transformer electric quantity data, or obtains distribution transformer from power information acquisition system Platform area real time data, basis of formation data platform is normalized to the data obtained；

Step S2, transfers each feeder line, the transformer substation voltage qualification rate data of rate of qualified voltage monitoring modular online feedback, carries out Electrical network scope, node voltage qualification rate statistical analysiss, show that the current emphasis of electrical network has the node and voltage of quality of voltage Unqualified degree；

Step S3, transfers each feeder line of reactive voltage intelligent evaluation module online feedback, the quality of voltage problem of transformer station Analysis result, the unqualified scope of voltage is clearly shown by distribution transforming node to electrical network scope；

Step S4, in electrical network is obtained after low-voltage problem analysis results, typical electrical network rectification scheme is quantified, and is built Vertical investment effect mathematical model, the ratio with prioritization scheme investment and voltage optimization value chooses typical optimized algorithm as object function Solve the optimal solution of object function so that investment is minimum, return highest.

6. as claimed in claim 1 a kind of based on master, the interactive voltage reactive integrated control system coordinated of power distribution network, its feature It is that the reactive power compensation ability configuration module is according to generation voltage, the unqualified degree of power factor in electrical network and position system occurs Idle in a pair of electrical networks, voltage control optimization device is controlled：

With the minimum basic Controlling principle of device action scope and action frequency, small range or certain single position low-voltage Situation, by local idle, voltage apparatus single movement；On a large scale the situation of low-voltage, main to consider high voltage bus side device Action, and coordinate idle, the voltage apparatus single movement in indivedual places.