CN110176753B - A Pole Fault Handling Method for Hybrid Multi-terminal HVDC Transmission System - Google Patents
A Pole Fault Handling Method for Hybrid Multi-terminal HVDC Transmission System Download PDFInfo
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- CN110176753B CN110176753B CN201910488391.9A CN201910488391A CN110176753B CN 110176753 B CN110176753 B CN 110176753B CN 201910488391 A CN201910488391 A CN 201910488391A CN 110176753 B CN110176753 B CN 110176753B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 15
- 238000003672 processing method Methods 0.000 claims abstract description 12
- 238000011217 control strategy Methods 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract 8
- 238000002955 isolation Methods 0.000 claims abstract 3
- 230000010363 phase shift Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
本发明提供一种混合多端直流输电系统的极区故障处理方法，当系统中有逆变站的极区发生故障时，该逆变站的单极区闭锁，并向系统中的整流站和其他非故障逆变站发送极区闭锁指令；系统中的整流站接收到极区闭锁指令后，将整流站故障极的触发角移到设定角度；在触发角移相的过程中，将故障逆变站极端口的电压降为零，中断系统的功率和电流；系统中的非故障逆变站接收到极区闭锁指令后，执行零电压控制策略；当故障逆变站所对应隔离开关的电流小于设定值时将其断开。本发明提供的技术方案，当逆变站的极区出现故障时能够将故障的逆变站从系统中切除，提高混合多端直流输电系统的可靠性。
The present invention provides a pole zone fault processing method for a hybrid multi-terminal direct current transmission system. When there is a fault in the pole zone of an inverter station in the system, the unipolar zone of the inverter station is blocked, and the rectifier station and others in the system are blocked. The non-faulty inverter station sends the pole zone blocking command; after the rectifier station in the system receives the polar zone blocking command, it moves the trigger angle of the faulty pole of the rectifier station to the set angle; The voltage at the pole port of the substation drops to zero, interrupting the power and current of the system; after the non-faulty inverter station in the system receives the pole zone blocking command, the zero-voltage control strategy is implemented; when the current of the isolation switch corresponding to the faulty inverter station is Turn it off when it is less than the set value. The technical scheme provided by the invention can remove the faulty inverter station from the system when the pole area of the inverter station is faulty, thereby improving the reliability of the hybrid multi-terminal direct current transmission system.
Description
Technical Field
The invention belongs to the technical field of direct current transmission control, and particularly relates to a pole region fault processing method of a hybrid multi-terminal direct current transmission system.
Background
Since the 80 s of the last century, the development of power transmission technology has been accelerated, and methods for improving transmission capability have been developed continuously, including high and new technologies such as direct current transmission technology, flexible alternating current transmission technology, and frequency division transmission technology, and capacity-increasing transformation technology for existing high-voltage alternating current transmission lines, such as voltage-increasing transformation, complex conduction capacity-increasing transformation, and direct current transmission technology for changing alternating current transmission lines into direct current transmission lines. The high-voltage direct-current transmission technology has very important practical significance for improving the transmission capability of the existing transmission system and excavating the potential of the existing equipment.
A multi-terminal dc transmission system is one of dc transmission systems, and generally comprises 3 or more than 3 converter stations and a high-voltage dc transmission line connected between the converter stations. Compared with a two-end direct-current power transmission system, the multi-end direct-current power transmission system can realize multi-power supply and multi-drop power receiving, and the power transmission mode is more flexible and faster.
The high-voltage direct-current transmission project mostly adopts a conventional LCC (line commutated converter) converter, which has the advantages of large transmission capacity, low cost, strong overload capacity and the like, but the LCC converter has the problem of phase commutation failure on an inversion side, has great influence on a receiving-end alternating-current system, and particularly has the risk of continuous phase commutation failure of a multi-circuit direct-current system in a region where direct-current transmission is intensively fed. The hybrid multi-terminal direct-current transmission system composed of the plurality of different types of converter stations can effectively solve the problem of phase change failure of the inverter station, has the advantages of economy, flexibility and the like, and is a development direction of long-distance and large-capacity power transmission in the future.
Compared with the conventional direct-current transmission system, the operation condition and the topological structure of the hybrid multi-terminal direct-current transmission system are more complex, and the fault processing method of the conventional direct-current transmission system is not completely applicable.
In the hybrid direct-current transmission system, an LCC converter station is used as a rectifier station, a VSC converter station is used as an inverter station, electric energy is rectified into direct current through the rectifier station and is input into the system, and the inverter station converts the electric energy in the system into alternating current for a user to use.
When multiple terminals of a hybrid direct-current transmission system run simultaneously, if a pole area of an inverter station fails, a commonly used method at present is to lock the pole area of the failed inverter station or control all corresponding poles to stop running; however, after the pole region of the fault inverter station is locked, the system is still transmitting power, and the isolating switch arranged on the output line of the inverter station has no capability of disconnecting large current, but the fault inverter station and other converter stations have no physical disconnection, so that the inverter station which is only locked in fault can not isolate the fault inverter station; and the corresponding poles are all shut down, which causes huge power loss.
In summary, no solution for solving the problem of pole area failure in the hybrid multi-terminal dc power transmission system exists in the prior art, which results in poor reliability of the hybrid multi-terminal dc power transmission system.
Disclosure of Invention
The invention aims to provide a pole region fault processing method of a hybrid multi-terminal direct-current power transmission system, which is used for solving the problem of poor reliability of the multi-terminal direct-current power transmission system in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a pole region fault processing method of a hybrid multi-terminal direct current transmission system comprises the following steps:
when a pole area with an inverter station in the system has a fault, locking a single pole area of the inverter station, and sending a pole area locking instruction to a rectifier station and other non-fault inverter stations in the system;
after a rectifying station in the system receives a pole region locking instruction, a trigger angle of a fault pole of the rectifying station is moved to a set angle; in the process of triggering angular phase shift, the voltage of a pole port of a fault inverter station is reduced to zero, and the power and the current of a system are interrupted;
after a non-fault inverter station in the system receives a pole region locking instruction, a zero voltage control strategy is executed;
and when the current of the isolating switch corresponding to the fault inverter station is smaller than a set value, the isolating switch is disconnected.
According to the technical scheme provided by the invention, when the pole area of the inverter station has a fault, the output voltage of the fault pole of the rectifier station is reduced to zero until power transmission and current transmission are interrupted, and the corresponding isolating switch is cut off when the current of the isolating switch is small, so that the fault inverter station is cut off from the system, and the reliability of the hybrid multi-terminal direct-current transmission system is improved.
In order to quickly recover the power of the system after the fault inverter station is isolated, after an isolating switch corresponding to the fault inverter station is disconnected, a rectifier station in the system is restarted by adopting a direct current control strategy, and a non-fault inverter station adopts a direct current voltage control strategy, so that the power of the rectifier station and the non-fault inverter station in the system is recovered.
As a further improvement to the commutation station fault pole firing angle phase shift, the set angle is 160 degrees.
The method for locking the fault pole of the rectifying station is simple.
Further, the fault handling method further comprises the following steps:
when a bipolar area of an inverter station in the system has a fault, the inverter station sends a bipolar area locking instruction to a rectifier station and other non-fault inverter stations in the system;
after a rectifying station in the system receives a bipolar locking instruction, a corresponding pole control system executes power drop, and the target value of the power drop is consistent with the power of a non-fault inverter station before fault;
and the inverter station with the fault adopts constant voltage control until the voltages at the two sides of the corresponding isolating switch are equal, and then the isolating switch is disconnected.
The over-constant voltage control strategy controls the fault inverter station, a corresponding isolating switch can be directly pulled open, disturbance of the phase shift restart of the rectifier station on an alternating current system is avoided, and the power drop strategy realizes stable operation of the non-fault inverter station.
Drawings
Fig. 1 is a topology structure diagram of a hybrid multi-terminal dc power transmission system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an inverter station according to an embodiment of the present invention;
fig. 3 is a flowchart of a processing method when a pole region of an inverter station fails according to an embodiment of the present invention.
Detailed Description
The invention aims to provide a method for processing a single-pole region fault of a hybrid multi-terminal direct-current power transmission system, which is used for solving the problem of poor reliability of the multi-terminal direct-current power transmission system in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a pole region fault processing method of a hybrid multi-terminal direct current transmission system comprises the following steps:
when a pole area with an inverter station in the system has a fault, locking a single pole area of the inverter station, and sending a pole area locking instruction to a rectifier station and other non-fault inverter stations in the system;
after a rectifying station in the system receives a pole region locking instruction, a trigger angle of a fault pole of the rectifying station is moved to a set angle; in the process of triggering angular phase shift, the voltage of a pole port of a fault inverter station is reduced to zero, and the power and the current of a system are interrupted;
after a non-fault inverter station in the system receives a pole region locking instruction, a zero voltage control strategy is executed;
and when the current of the isolating switch corresponding to the fault inverter station is smaller than a set value, the isolating switch is disconnected.
The technical solution of the present invention will be further described with reference to the following embodiments.
The embodiment provides a method for processing a single-pole region fault of a hybrid multi-terminal direct-current power transmission system, which is used for isolating a faulty inverter station from the system when a pole region with the inverter station in the hybrid multi-terminal direct-current power transmission system has the fault.
A method for processing a single-pole region fault of a hybrid multi-terminal dc transmission system provided in this embodiment is applicable to a hybrid multi-terminal dc transmission system as shown in fig. 1, where a transmitting end of the system is an LCC converter station a, and receiving ends are a VSC converter station B and a VSC converter station C, that is, the LCC converter station a is a rectifier station, and the VSC converter station B and the VSC converter station C are inverter stations; and the direct current sides of the VSC converter station B and the VSC converter station C are provided with a disconnecting switch HSS.
The inversion station can be divided into a polar zone and a bipolar zone, and the division schematic diagram is shown in fig. 2.
When a fault in an inverter station occurs in a polar region of the inverter station, a flow of a fault processing method is shown in fig. 3, and the method specifically comprises the following steps:
when a polar region with an inverter station in the system has a fault, locking a single-polar region of the inverter station, and sending a single-polar region locking instruction to a rectifier station and other non-fault inverter stations in the system;
after a rectifying station in the system receives a pole region locking instruction, the trigger angle of a fault pole of the rectifying station is shifted to 160 degrees; in the process of triggering angular phase shift, the voltage of a fault pole port of the rectifier station is reduced to zero, and the power and the current of a system are interrupted;
after a non-fault inverter station in the system receives a pole region locking instruction, a zero voltage control strategy is executed;
and when the current of the isolating switch corresponding to the fault inverter station is less than a set value, the isolating switch is disconnected, and the fault inverter station, the rectifier station and the non-fault inverter station are isolated and continuously operated.
When the fault in the inverter station occurs in the bipolar region of the inverter station, the fault processing method comprises the following steps:
when a bipolar area with an inverter station in the system has a fault, the inverter station sends a bipolar locking instruction to a rectifier station and other non-fault inverter stations in the system;
after a rectifying station in the system receives a bipolar locking instruction, a corresponding pole control system executes power drop, and the target value of the power drop is consistent with the power of a non-fault inverter station before fault;
and the inverter station with the fault adopts constant voltage control until the voltages at the two sides of the corresponding isolating switch are equal, and then the isolating switch is disconnected to isolate the fault inverter station, the rectifier station and the non-fault inverter station to continue operation.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
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| CN201910488391.9A CN110176753B (en) | 2019-06-05 | 2019-06-05 | A Pole Fault Handling Method for Hybrid Multi-terminal HVDC Transmission System |
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| CN110176753B true CN110176753B (en) | 2022-02-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110912175A (en) * | 2019-12-03 | 2020-03-24 | 国网河南省电力公司电力科学研究院 | Hybrid four-terminal high-voltage direct-current transmission system |
| CN111697553B (en) * | 2020-05-15 | 2021-10-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A method for automatic selection of voltage level for fault restart of DC transmission line |
| CN111600326B (en) * | 2020-05-25 | 2022-07-22 | 南京南瑞继保电气有限公司 | Power transfer method of parallel three-terminal direct-current power transmission system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807793A (en) * | 2010-04-20 | 2010-08-18 | 国网电力科学研究院 | Method for measuring and calculating reduction quantity of transmitted power during monopolar locking of bipolar direct current transmission system |
| CN104022499A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Multiport back-to-back DC-DC converter |
| CN108933445A (en) * | 2018-06-28 | 2018-12-04 | 东北电力大学 | DC grid short-circuit current calculation method based on the loop method of analysis |
| CN109347136A (en) * | 2018-11-23 | 2019-02-15 | 南京南瑞继保电气有限公司 | A kind of online extractor of Hybrid HVDC system inverter and method |
| CN109524981A (en) * | 2018-11-22 | 2019-03-26 | 南京南瑞继保电气有限公司 | A kind of parallel connection multi-terminal HVDC transmission line fault method for restarting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140177292A1 (en) * | 2012-12-21 | 2014-06-26 | Dennis A. Woodford | Multilevel valve for voltage sourced converter transmission |
| EP2773032A1 (en) * | 2013-03-01 | 2014-09-03 | GE Energy Power Conversion Technology Ltd | Current source converter with gate turn off semiconductor elements and a special commutation mode |
-
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- 2019-06-05 CN CN201910488391.9A patent/CN110176753B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807793A (en) * | 2010-04-20 | 2010-08-18 | 国网电力科学研究院 | Method for measuring and calculating reduction quantity of transmitted power during monopolar locking of bipolar direct current transmission system |
| CN104022499A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Multiport back-to-back DC-DC converter |
| CN108933445A (en) * | 2018-06-28 | 2018-12-04 | 东北电力大学 | DC grid short-circuit current calculation method based on the loop method of analysis |
| CN109524981A (en) * | 2018-11-22 | 2019-03-26 | 南京南瑞继保电气有限公司 | A kind of parallel connection multi-terminal HVDC transmission line fault method for restarting |
| CN109347136A (en) * | 2018-11-23 | 2019-02-15 | 南京南瑞继保电气有限公司 | A kind of online extractor of Hybrid HVDC system inverter and method |
Non-Patent Citations (1)
| Title |
|---|
| 柔性直流配电网故障分析;戴志辉;《电工技术学报》;20180430;第33卷(第4期);全文 * |
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