CN116031924A - Current transformer station power system wiring and operation method with security section - Google Patents

Current transformer station power system wiring and operation method with security section Download PDF

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Publication number
CN116031924A
CN116031924A CN202211694246.4A CN202211694246A CN116031924A CN 116031924 A CN116031924 A CN 116031924A CN 202211694246 A CN202211694246 A CN 202211694246A CN 116031924 A CN116031924 A CN 116031924A
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power supply
bus
section
breaker
working
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CN116031924B (en
Inventor
戚乐
张勇
吴小东
杨金根
胡金
肖异
夏泠风
曾维雯
陆洲
张梓铭
王秋源
刘哲骁
魏来
张哲�
金希普
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China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
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China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention provides a power system wiring for a converter station with a security section and an operation method thereof. The connection of the power utilization system of the converter station can ensure the basic running state in the converter station when the power supply section loses power and/or the transformer is out of operation.

Description

Current transformer station power system wiring and operation method with security section
Technical Field
The invention relates to the technical field of the transformer station, in particular to a wiring and operation method of an electric system for a transformer station, which is provided with a security section.
Background
The high-voltage direct-current transmission technology is a main technical means of large-capacity and long-distance transmission, and a direct-current converter station is an important facility of a direct-current transmission project. At present, the design experience of the conventional DC converter stations in China is quite high, and the station power system design technical scheme of the DC converter stations is also mature. More and more developing countries start to build high-voltage direct-current transmission projects, and new requirements are also put forward on the direct-current project design because of weak foundation power grid facilities of the developing countries.
In general, a dc converter station is provided with a three-circuit power supply, and at least one power supply is considered to be connected from outside the station in order to improve the reliability of the station power supply. However, in areas where the infrastructure of the power grid is weak, regional power failure may occur, that is, the ac bus and the external power supply in the station lose power, and the power loss time is sometimes long, while the stand-by power supply of conventional design can only support two to three hours. In this case, in order to ensure that the operators in the converter station normally live and work and that the converter station can be successfully connected when the ac transmission system is electrified again, a station electric connection system with a security section needs to be designed.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a wiring system for a power consumption system of a converter station with a security section and an operation method thereof.
The invention provides a power system wiring for a convertor station with a security section, which comprises a plurality of load centers, a first power supply section, a second power supply section, a third power supply section and a security section, wherein the first power supply section, the second power supply section, the third power supply section and the security section can supply power to the load centers, the first power supply section, the second power supply section and the third power supply section are connected in parallel, the third power supply section is connected with the first power supply section through a three-phase circuit breaker, the third power supply section is connected with the second power supply section through two three-phase circuit breakers, each load center comprises a plurality of working buses and a standby bus, the working buses are connected through the circuit breakers, the standby bus is connected with one of the working buses through the circuit breakers, the first power supply section and the second power supply section are respectively connected with all working buses of each load center through dry-type transformers, and the security section is connected with the standby bus of each load center through the circuit breakers.
Further, the first power supply section includes first power inlet wire for the station that returns, first working section, the second power supply section includes second power inlet wire for the station that returns, second working section, the third power supply section includes third power inlet wire for the station that returns, third working section, first power inlet wire for the station that returns is connected with first working section through first power inlet wire circuit breaker, second power inlet wire for the station that returns is connected with the second working section through second power inlet wire circuit breaker, third power inlet wire for the station that returns is connected with third working section through third power inlet wire circuit breaker, third working section is connected with first working section through a triple circuit breaker, third working section is connected with the second working section through a triple circuit breaker, first working section and second working section are all connected with load center's working busbar circuit breaker through second triple circuit breaker, dry-type transformer.
Further, the safety section comprises a safety power supply and a safety bus, wherein the safety power supply is connected with the safety bus through a safety power supply main breaker, and the safety bus is respectively connected with the standby bus of each load center through the breaker.
Further, the load centers comprise a first load center, a second load center and a third load center;
The first load center comprises a first bus, a second bus and a seventh bus, wherein the first bus and the second bus are working buses, the seventh bus is a standby bus, the first bus is connected with the second bus through a two-communication circuit breaker, and the seventh bus is connected with the first bus through a seven-communication circuit breaker;
the second load center comprises a third bus, a fourth bus and an eighth bus, wherein the third bus and the fourth bus are working buses, the eighth bus is a standby bus, the third bus is connected with the fourth bus through a three-four-connection breaker, and the eighth bus is connected with the third bus through a three-eight-connection breaker;
the third load center comprises a fifth bus, a sixth bus and a ninth bus, wherein the fifth bus and the sixth bus are working buses, the ninth bus is a standby bus, the fifth bus is connected with the sixth bus through a fifth-sixth interconnection breaker, and the ninth bus is connected with the fifth bus through a fifth-ninth interconnection breaker;
the first working section is provided with a first outgoing line, a second outgoing line and a third outgoing line, the first working section is connected with a first bus, a fifth bus and a third bus respectively through the first outgoing line, the second outgoing line and the third outgoing line, the first outgoing line is provided with a first outgoing line breaker, a first dry-type transformer and a first incoming line breaker, the second outgoing line is provided with a second outgoing line breaker, a second dry-type transformer and a second incoming line breaker, and the third outgoing line is provided with a third outgoing line breaker, a third dry-type transformer and a third incoming line breaker;
The second working section is provided with a fourth outgoing line, a fifth outgoing line and a sixth outgoing line, the second working section is respectively connected with a fourth bus, a second bus and a sixth bus through the fourth outgoing line, the fourth outgoing line is provided with a fourth outgoing line breaker, a fourth dry-type transformer and a fourth incoming line breaker, the fifth outgoing line is provided with a fifth outgoing line breaker, a fifth dry-type transformer and a fifth incoming line breaker, and the sixth outgoing line is provided with a sixth outgoing line breaker, a sixth dry-type transformer and a sixth incoming line breaker;
the safety bus is provided with a first safety outlet, a second safety outlet and a third safety outlet, the safety bus is respectively connected with a seventh bus, an eighth bus and a ninth bus through the first safety outlet, the second safety outlet and the third safety outlet, and the first safety outlet, the second safety outlet and the third safety outlet are respectively provided with a standby connecting circuit breaker, a secondary connecting circuit breaker and a tertiary connecting circuit breaker.
The invention also provides an operation method of the wiring of the power system for the convertor station with the security section, which comprises a first working condition when the first power supply section, the second power supply section and the third power supply section are all powered off, wherein the first working condition comprises the following steps: the safety section supplies power to the standby buses of the load centers, a safety power supply is started, the circuit breaker between the safety section and the standby buses of each load center is switched on, the safety power supply is switched on, and all other circuit breakers are switched off.
Further, the operation method includes a second working condition during normal operation, where the second working condition includes: the safety power supply is closed, the first power supply section and the second power supply section supply power to the plurality of load centers, the one-three-channel breaker and the two-three-channel breaker are opened, the breaker between the working buses of each load center is opened, the breaker between the safety section and the standby bus of each load center is opened, the safety power supply main breaker is opened, and all other breakers are closed.
Further, the operation method comprises a third working condition when any two power supply sections lose power, and the third working condition comprises: the security power supply is closed, and a power supply section which is not powered off supplies power to a plurality of load centers;
when the third power supply section loses electricity, the third power supply incoming line breaker is opened, the power supply incoming line breaker on the other power supply section loses electricity is opened, the breaker between the security section and the standby bus of each load center is opened, the security power supply main breaker is opened, and all other breakers are closed.
When the third power supply section is not powered down, the first power supply incoming line circuit breaker and the second power supply incoming line circuit breaker are disconnected, the circuit breaker between the working buses of each load center is disconnected, the circuit breaker between the security section and the standby bus of each load center is disconnected, the security power supply main circuit breaker is disconnected, and all other circuit breakers are closed.
Further, the operation method includes a fourth working condition when any one of the power supply sections loses power, and the fourth working condition includes: the safety power supply is closed, and the other two power supply sections which are not powered off supply power to a plurality of load centers:
when the third power supply section is powered off, the switching state of all the circuit breakers is the same as the second working condition in normal operation;
when the first power supply section or the second power supply section loses power, the circuit breaker between the third power supply section and the power supply section which loses power is switched on, the power supply inlet wire circuit breaker of the power supply section which loses power is switched off, and the switching-on and switching-off states of other circuit breakers are the same as the second working condition in normal operation.
Further, the operation method comprises a fifth working condition that the dry type transformer on the first power supply section or the second power supply section is out of operation, and the fifth working condition comprises: the circuit breakers between the working bus bar of the load center and the adjacent working bus bar of the outgoing line connection corresponding to the dry-type transformer which is out of operation are switched on, the circuit breakers on the outgoing line corresponding to the dry-type transformer which is out of operation are switched off, and the switching-on and switching-off states of other circuit breakers are the same as the second working condition in normal operation.
Further, the operation method includes a sixth operation mode in which all dry transformers connected to the same load center are out of operation, the sixth operation mode including: the safety section supplies power to the load center corresponding to the dry-type transformer which is out of operation, a safety power supply is started, a safety power supply main breaker is switched on, a breaker between a safety bus and the load center corresponding to the dry-type transformer which is out of operation is switched on, a breaker between working buses and a breaker between a standby bus and the working bus are switched on, a breaker on an outgoing line corresponding to the dry-type transformer which is out of operation is switched off, and the switching-on and switching-off states of other breakers are the same as the second working condition in normal operation.
The beneficial effects of the invention are as follows:
1. when the first power supply section, the second power supply section and the third power supply section can not supply power, the alternating current power grid connected with the converter station is considered to be completely powered off, and the converter station can not normally perform direct current transmission. For the standby power supply of the conventional converter station, the storage battery is generally used for maintaining power supply, the capacity of the storage battery can only support 2-3 hours, when the power failure in the station exceeds 3 hours, the standby power supply maintained by the storage battery is invalid, and the communication system, the switch equipment, the control protection screen cabinet in the relay room and the like in the station cannot be used after the standby power supply in the station is powered off. Meanwhile, the valve hall air conditioning system is not connected with a standby power supply, and once power is cut off, the valve hall cannot be maintained in a micro-positive pressure state. According to the invention, the safety sections are arranged, so that when the first power supply section, the second power supply section and the third power supply section cannot supply power, the safety sections supply power to the standby buses by switching on the circuit breakers between the safety sections and the standby buses of the load center and switching off the standby buses from the load center, the basic running state in the direct current converter station can be ensured for a long time, the direct current power transmission system can be started quickly by the direct current converter station after the alternating current power grid resumes power supply, and the power transmission reliability and the power transmission efficiency of the direct current converter station are improved.
2. According to the invention, the circuit breakers are arranged between the safety bus and the standby bus of each load center, so that when the dry-type transformer is out of operation without the problem of power failure, the circuit breakers between the load center corresponding to the dry-type transformer out of operation and the safety bus can be switched on, so that the load center is independently powered by the safety power supply, and other load centers are still powered by the first power supply section, the second power supply section and the third power supply section.
3. According to the invention, the circuit breakers are arranged between the working buses, so that when one dry-type transformer is withdrawn to run, the working buses are communicated by switching on the circuit breakers between the working buses corresponding to the dry-type transformer withdrawn to run and the working buses connected with the working buses.
4. According to the invention, the circuit breaker is arranged between the working bus and the standby bus, so that the safety power supply can supply power to the load center when the power supply section loses power or when a plurality of dry transformers are out of operation.
5. According to the invention, the first standby communication circuit breaker, the second standby communication circuit breaker and the third standby communication circuit breaker are arranged, so that the safety power supply can independently supply power when a certain load center cannot obtain power supply, for example, the first dry-type transformer and the fifth dry-type transformer are out of operation.
Drawings
FIG. 1 is a schematic diagram of a wiring circuit of the present invention;
reference numerals: 1-a first power supply section; 101-a first station is connected with a power supply wire; 102-a first working section; 103-a first power supply line breaker; 104-a triple circuit breaker; 105-first outgoing line; 106-a first outgoing circuit breaker; 107-a first dry-type transformer; 108-a second outgoing line; 109-a second outgoing circuit breaker; 110-a second dry-type transformer; 111-a third outgoing line; 112-a third outgoing line breaker; 113-a third dry-type transformer;
2-a second power supply section; 201-a second station is connected with a power supply wire; 202-a second working section; 203-a second power supply line breaker; 204-two triple circuit breakers; 205-fourth wire; 206-a fourth outgoing circuit breaker; 207-fourth dry transformer; 208-fifth outgoing line; 209-fifth outgoing line breaker; 210-a fifth dry-type transformer; 211-sixth outgoing line; 212-a sixth outgoing line breaker; 213-sixth dry-type transformer;
3-a third power supply section; 301-a third station is connected with a power supply wire; 302-a third working segment; 303-a third power line breaker;
4-a security section; 401-a security power supply; 402-a security power master breaker; 403-safety bus; 404-a backup tie breaker; 405-second backup contact breaker; 406-three backup contact breaker; 407-first security outgoing line, 408-second security outgoing line, 409-third security outgoing line;
5-a first load center; 501-a first busbar; 502-a second busbar; 503-seventh bus; 504-two-phase circuit breaker; 505-seven tie breaker; 506-a first incoming line breaker; 507-fifth incoming line breaker;
6-a second load center; 601-a third busbar; 602-fourth bus bar; 603-eighth bus bar; 604-a three-four-phase circuit breaker; 605-thirty-eight tie breakers; 606-a third incoming line breaker; 607-fourth incoming line breaker;
7-a third load center; 701-a fifth busbar; 702-sixth bus bar; 703-ninth bus bar; 704-five six link circuit breakers; 705-fifty-nine tie breakers; 706-a second incoming line breaker; 707-sixth line breaker.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As shown in fig. 1, a power system wiring for a converter station with a security section comprises a plurality of load centers, a first power supply section 1, a second power supply section 2, a third power supply section 3 and a security section 4, wherein the first power supply section 1, the second power supply section 2 and the third power supply section 3 can supply power to the load centers, the first power supply section 1, the second power supply section 2 and the third power supply section 3 are connected in parallel, the third power supply section 3 is connected with the first power supply section 1 through a three-way circuit breaker 104, the third power supply section 3 is connected with the second power supply section 2 through two three-way circuit breakers 204, each load center comprises a plurality of working buses and a standby bus, a plurality of working buses are connected through circuit breakers, the standby bus is connected with one of the working buses, the first power supply section 1 and the second power supply section 2 are respectively connected with all working buses of each load center through dry-type transformers, and the security section 4 is connected with the standby bus of each load center through a three-way circuit breaker.
Specifically, the first power supply section 1, the second power supply section 2 and the third power supply section 3 are all connected with a 10kV power supply, the dry type transformer is a 10/0.4kV dry type transformer, the high voltage side of the dry type transformer is connected with the power supply section, the low voltage side of the dry type transformer is connected with the load center, the voltage required by the load center is 400V, the first power supply section 1 and the second power supply section 2 are powered by an alternating current bus in a station, the third power supply section 3 is powered by an external power supply, and the security power supply 401 can provide 400V of voltage.
It can be understood that when the first power supply section 1 and/or the second power supply section 2 lose power, the third power supply section 3 can supply power to a plurality of load centers through switching on a three-link circuit breaker 104 and/or a two-three-link circuit breaker 204, but regional power failure may occur in a region with weak infrastructure power grid facilities, and the external power supply of the third power supply section 3 cannot supply power, at this time, the safety section 4 can supply power to each standby bus by switching on the circuit breaker between the safety section 4 and the standby bus of the load center, so that the basic operation state in the direct current converter station can be ensured, and the direct current power transmission system can be quickly started by the direct current converter station after the alternating current power grid resumes power supply, thereby improving the power transmission reliability and the power transmission efficiency of the direct current converter station.
Further, the first power supply section 1 includes a first power supply line 101 for a station, a first working section 102, the second power supply section 2 includes a second power supply line 201 for a station, a second working section 202, the third power supply section 3 includes a third power supply line 301 for a station, and a third working section 302, the first power supply line 101 for a station is connected with the first working section 102 through a first power supply line breaker 103, the second power supply line 201 for a station is connected with the second working section 202 through a second power supply line breaker 203, the third power supply line 301 for a station is connected with the third working section 302 through a third power supply line breaker 303, the third working section 302 is connected with the first working section 102 through a third link breaker 104, the third working section 302 is connected with the second working section 202 through a second link breaker 204, and the first working section 102 and the second working section 202 are both connected with a bus bar of a load center through a breaker and a dry transformer.
It can be appreciated that the first power supply section 1 and the second power supply section 2 can supply power to the load center by switching on the first power supply incoming line circuit breaker 103, the second power supply incoming line circuit breaker 203, the first working section 102, the second working section 202 and the load center, and when the first power supply section 1 or the second power supply section 2 loses power, the third power supply section 3 is switched on by the three-phase circuit breaker 104 or the two three-phase circuit breakers 204, so that the third power supply section 3 is connected to the working section corresponding to the power-lost power supply section, and the normal operation of the converter station is ensured.
Further, the safety section 4 comprises a safety power supply 401 and a safety bus 403, wherein the safety power supply 401 is connected with the safety bus 403 through a safety power supply main breaker 402, and the safety bus 403 is respectively connected with a standby bus of each load center through a breaker.
It can be appreciated that by arranging a circuit breaker between the safety bus 403 and the standby bus of each load center, when there is no power loss problem but the dry transformer is out of operation, the circuit breaker between the load center corresponding to the dry transformer out of operation and the safety bus 403 can be switched on, so that the load center is independently powered by the safety power supply 401, while the other load centers are still powered by the first power supply section 1, the second power supply section 2 and the third power supply section 3.
In some embodiments, the load centers include a first load center 5, a second load center 6, a third load center 7;
the first load center 5 includes a first bus 501, a second bus 502, and a seventh bus 503, where the first bus 501 and the second bus 502 are working buses, the seventh bus 503 is a standby bus, the first bus 501 is connected to the second bus 502 through a two-link circuit breaker 504, and the seventh bus 503 is connected to the first bus 501 through a seven-link circuit breaker 505;
By arranging the two-connection breaker 504, when the first dry-type transformer 107 or the fifth dry-type transformer 210 is out of operation, the first bus 501 and the second bus 502 are communicated by switching on the two-connection breaker 504, and the first bus 501 and the second bus 502 can be powered. By arranging the seven connecting circuit breakers 505, the safety power supply 401 can supply power to the seventh bus 503 of the standby bus of the first load center 5 when the three power supply sections lose power, or can supply power to the first load center 5 when the first dry-type transformer 107 and the fifth dry-type transformer 210 are out of operation, namely, the seventh bus 503, the first bus 501 and the second bus 502 are simultaneously supplied with power.
The second load center 6 includes a third bus 601, a fourth bus 602, and an eighth bus 603, where the third bus 601 and the fourth bus 602 are working buses, the eighth bus 603 is a standby bus, the third bus 601 is connected to the fourth bus 602 through a three-four circuit breaker 604, and the eighth bus 603 is connected to the third bus 601 through a three-eight circuit breaker 605;
by arranging the three-four-connection breaker 604, when the third dry-type transformer 113 or the fourth dry-type transformer 207 is out of operation, the third bus 601 and the fourth bus 602 are communicated through the three-four-connection breaker 604, and the third bus 601 and the fourth bus 602 can be powered. By arranging the three-eight tie circuit breaker 605, the safety power supply 401 can supply power to the eighth bus 603 of the standby bus of the second load center 6 when the three power supply sections lose power, or can supply power to the second load center 6 when the third dry-type transformer 113 and the fourth dry-type transformer 207 are out of operation, namely, the eighth bus 603, the third bus 601 and the fourth bus 602.
The third load center 7 includes a fifth bus 701, a sixth bus 702, and a ninth bus 703, where the fifth bus 701 and the sixth bus 702 are working buses, the ninth bus 703 is a standby bus, the fifth bus 701 is connected to the sixth bus 702 through a fifth-sixth interconnection breaker 704, and the ninth bus 703 is connected to the fifth bus 701 through a fifth-ninth interconnection breaker 705;
when the second dry-type transformer 110 or the sixth dry-type transformer 213 is out of operation, the fifth bus 701 and the sixth bus 702 are communicated with each other by arranging the fifth and sixth interconnection breakers 704, and the fifth bus 701 and the sixth bus 702 can be powered on. By arranging the fifty-nine tie breaker 705, the safety power supply 401 can supply power to the ninth bus 703 of the standby bus of the third load center 7 when the three power supply sections lose power, or the safety power supply 401 can supply power to the third load center 7 when the second dry-type transformer 110 and the sixth dry-type transformer 213 are out of operation, namely, the ninth bus 703, the fifth bus 701 and the sixth bus 702.
The first working section 102 is provided with a first outgoing line 105, a second outgoing line 108 and a third outgoing line 111, the first working section 102 is respectively connected with a first bus 501, a fifth bus 701 and a third bus 601 through the first outgoing line 105, the second outgoing line 108 and the third outgoing line 111, the first outgoing line 105 is provided with a first outgoing line breaker 106, a first dry-type transformer 107 and a first incoming line breaker 506, the second outgoing line 108 is provided with a second outgoing line breaker 109, a second dry-type transformer 110 and a second incoming line breaker 706, and the third outgoing line 111 is provided with a third outgoing line breaker 112, a third dry-type transformer 113 and a third incoming line breaker 606;
A fourth outgoing line 205, a fifth outgoing line 208 and a sixth outgoing line 211 are arranged on the second working section 202, the second working section 202 is connected with a fourth bus 602, a second bus 502 and a sixth bus 702 through the fourth outgoing line 205, the fifth outgoing line 208 and the sixth outgoing line 211, a fourth outgoing line breaker 206, a fourth dry-type transformer 207 and a fourth incoming line breaker 607 are arranged on the fourth outgoing line 205, a fifth outgoing line breaker 209, a fifth dry-type transformer 210 and a fifth incoming line breaker 507 are arranged on the fifth outgoing line 208, and a sixth outgoing line breaker 212, a sixth dry-type transformer 213 and a sixth incoming line breaker 707 are arranged on the sixth outgoing line 211;
by arranging the first outgoing line breaker 106, the first dry-type transformer 107 and the first incoming line breaker 506 on the first outgoing line 105, when the first dry-type transformer 107 is out of operation, the first outgoing line breaker 106 and the first incoming line breaker 506 are separated, and the two-way circuit breaker 504 is switched on, so that the power supply of the first bus 501 is ensured, and the power supply of the second outgoing line 108 and the third outgoing line 111 is not influenced. Other outgoing line breakers and incoming line breakers have the same effect as described above.
The safety bus 403 is provided with a first safety outlet 407, a second safety outlet 408 and a third safety outlet 409, the safety bus 403 is connected with a seventh bus 503, an eighth bus 603 and a ninth bus 703 through the first safety outlet 407, the second safety outlet 408 and the third safety outlet 409, and the first safety outlet 407, the second safety outlet 408 and the third safety outlet 409 are respectively provided with a standby communication breaker 404, a secondary communication breaker 405 and a tertiary communication breaker 406.
By arranging the first standby communication breaker 404, the second standby communication breaker 405 and the third standby communication breaker 406, the safety power supply 401 can supply power independently when a certain load center cannot obtain power, for example, the first dry-type transformer 107 and the fifth dry-type transformer 210 are out of operation.
The operation method for the wiring of the power system of the convertor station provided with the security section comprises a plurality of working conditions:
first working condition: under the condition that the first power supply section 1, the second power supply section 2 and the third power supply section 3 are all powered off; the safety section 4 supplies power to the standby buses of the plurality of load centers, the safety power supply 401 is started, the circuit breaker between the safety section 4 and the standby bus of each load center is switched on, the safety power supply main circuit breaker 402 is switched on, and all other circuit breakers are switched off.
The first working condition is specifically as follows: the safety power supply 401 is started, the safety power supply main breaker 402, the first standby connecting breaker 404, the second standby connecting breaker 405 and the third standby connecting breaker 406 are switched on, all other breakers are switched off, and the safety power supply 401 supplies power to the first load center seventh bus 503, the second load center eighth bus 603 and the third load center ninth bus 703 through the safety bus 403.
The second working condition is as follows: under the normal operation condition without any abnormality, the safety power supply 401 is turned off, the first power supply section 1 and the second power supply section 2 supply power to the plurality of load centers, the one-three-channel circuit breaker 104 and the two-three-channel circuit breaker 204 are switched off, the circuit breakers between the working buses of each load center are switched off, the circuit breakers between the safety section 4 and the standby buses of each load center are switched off, the safety power supply main circuit breaker 402 is switched off, and all other circuit breakers are switched on.
The second working condition is specifically as follows: the first power supply section 1 directly supplies power to the first bus 501, the third bus 601, the fifth bus 701, the seventh bus 503, the eighth bus 603 and the ninth bus 703, and the second power supply section 2 directly supplies power to the fourth bus 602, the second bus 502 and the sixth bus 702.
Third working condition: under the condition that any two power supply sections lose power, the security power supply 401 is closed, and one power supply section which does not lose power supplies power to a plurality of load centers;
when the third power supply section 3 loses electricity, the third power supply incoming line breaker 303 is opened, the power supply incoming line breaker on the other power supply section which loses electricity is opened, the breaker between the security section 4 and the standby bus of each load center is opened, the security power supply main breaker 402 is opened, and all other breakers are closed.
When the third power supply section 3 is not powered down, the first power supply incoming line breaker 103 and the second power supply incoming line breaker 203 are disconnected, the breakers between the working buses of each load center are disconnected, the breakers between the security section 4 and the standby buses of each load center are disconnected, the security power supply main breaker 402 is disconnected, and all other breakers are closed.
The third working condition is specifically as follows: when the third power supply section 3 and the second power supply section 2 lose power, the third power supply incoming line breaker 303, the second power supply incoming line breaker 203, the primary contact breaker 404, the secondary contact breaker 405, the tertiary contact breaker 406 and the security power supply main breaker 402 are opened, and all other breakers are closed. At this time, the first power supply section 1 directly supplies power to the first bus 501, the third bus 601, the fifth bus 701, the seventh bus 503, the eighth bus 603, and the ninth bus 703, and the second bus 502, the fourth bus 602, and the sixth bus 702 are powered by the two-connection circuit breaker 504, the three-four-connection circuit breaker 604, and the five-six-connection circuit breaker 704.
When the third power supply section 3 is not powered down, that is, the first power supply section 1 and the second power supply section 2 are powered down, the first power supply incoming line breaker 103, the second power supply incoming line breaker 203, the two-communication breaker 504, the three-four-communication breaker 604, the five-six-communication breaker 704, the one-standby communication breaker 404, the two-standby communication breaker 405, the three-standby communication breaker 406 and the security power supply main breaker 402 are opened, and all other breakers are closed. Since the one and two three- way circuit breakers 104 and 204 are closed, the third power section 3 can supply power to all load centers through the first and second working sections 102 and 202.
Fourth working condition: when any one of the power supply sections is powered off, the safety power supply 401 is turned off, and the other two power supply sections which are not powered off supply power to the plurality of load centers:
when the third power supply section 3 is powered off, the switching state of all the circuit breakers is the same as the second working condition in normal operation;
when the first power supply section 1 or the second power supply section 2 loses power, a breaker between the third power supply section 3 and the power supply section which loses power is switched on, a power supply incoming line breaker of the power supply section which loses power is switched off, and the switching-on and switching-off states of other breakers are the same as the second working condition in normal operation.
The fourth working condition is specifically: when the third power supply section 3 is powered off, the switching state of all the circuit breakers is the same as the second working condition in normal operation; the third power supply section 3 is actually used as a standby power supply for the first power supply section 1 and the second power supply section 2, so that the power supply of the first power supply section 1 and the second power supply section 2 is not affected when the third power supply section 3 loses power.
When the first power supply section 1 or the second power supply section 2 loses power, the one three-way circuit breaker 104 or the two three-way circuit breaker 204 is switched on, the power supply incoming line circuit breaker of the power-losing power supply section is switched off, and the switching-on and switching-off states of other circuit breakers are the same as the second working condition in normal operation. When the first power supply section 1 or the second power supply section 2 is powered off, the one three-phase circuit breaker 104 or the two three-phase circuit breaker 204 is directly switched on, and the third power supply section 3 can replace the first power supply section 1 or the second power supply section 2.
Fifth working condition: under the condition that the dry type transformer on the first power supply section 1 or the second power supply section 2 is out of operation, a circuit breaker between a working bus bar of a load center of an outgoing line connection corresponding to the out-of-operation dry type transformer and an adjacent working bus bar is switched on, the circuit breakers on the outgoing line corresponding to the out-of-operation dry type transformer are switched off, and the switching-on and switching-off states of other circuit breakers are the same as the second working condition in normal operation.
The fifth working condition is specifically as follows: assuming that all dry transformers on the first power supply section 1 are out of operation, the two-connection circuit breaker 504, the three-four-connection circuit breaker 604 and the five-six-connection circuit breaker 704 are closed, the first outgoing circuit breaker 106, the first incoming circuit breaker 506, the second outgoing circuit breaker 109, the second incoming circuit breaker 706, the third outgoing circuit breaker 112 and the third incoming circuit breaker 606 are opened, and the opening and closing states of other circuit breakers are the same as the second working condition in normal operation. Since the first dry transformer 107, the second dry transformer 110 and the third dry transformer 113 are all out of operation, the first power supply section 1 cannot directly supply power to the first bus 501, the third bus 601 and the fifth bus 701, and the second power supply section 2 supplies power to the first bus 501, the third bus 601 and the fifth bus 701 by switching on the two-connection circuit breaker 504, the three-four-connection circuit breaker 604 and the five-six-connection circuit breaker 704.
Assuming that the first dry-type transformer 107 on the first power supply section 1 is out of operation, the two-way circuit breaker 504 is closed, the first outgoing circuit breaker 106 and the first incoming circuit breaker 506 are opened, the opening and closing states of other circuit breakers are the same as the second working condition in normal operation, at this time, the first power supply section 1 only supplies power to the third bus 601 and the fifth bus 701, and the first bus 501 is powered by the second power supply section 2. Since the first dry type transformer 107 is out of operation, the first power supply section 1 cannot directly supply power to the first bus 501, and the second power supply section 2 can supply power to the first bus 501 by switching on the two-way circuit breaker 504.
Sixth working condition: under the condition that all dry transformers connected to the same load center are out of operation, a security section 4 supplies power to the load center corresponding to the dry transformer out of operation, a security power supply 401 is started, a security power supply main breaker 402 is switched on, a breaker between a security bus 403 and the load center corresponding to the dry transformer out of operation is switched on, in the load center corresponding to the dry transformer out of operation, a breaker between working buses and a breaker between a standby bus and the working bus are switched on, and the breakers on outgoing lines corresponding to the dry transformer out of operation are switched off, and the switching-on and switching-off states of other breakers are the same as the second working condition in normal operation.
The sixth working condition is specifically: if the first dry transformer 107 and the fifth dry transformer 210 connected to the first load center 5 are out of operation, the first outgoing circuit breaker 106, the first incoming circuit breaker 506, the fifth outgoing circuit breaker 209, and the fifth incoming circuit breaker 507 are opened, the two-way circuit breaker 504, the seven-way circuit breaker 505, and the standby-way circuit breaker 404 are closed, and the other circuit breakers are opened and closed under the same second working condition as those in normal operation, and at this time, the first power supply section 1 and the second power supply section 2 do not supply power to the first bus 501 and the second bus 502, but supply power to the first bus 501 and the second bus 502 by the security section 4, thereby ensuring stable power supply in the converter station.
The power failure of the first power supply section 1, the power failure of the second power supply section 2 and the power failure of the third power supply section 3 refer to the power failure of the first power supply section 1, the power failure of the first power supply line 101 for the station, the power failure of the second power supply line 201 for the station and the power failure of the third power supply line 301 for the station, respectively.
According to the invention, when the direct current converter station is in a weak power grid system and is subjected to long-time power failure of the alternating current power grid, the basic running state in the direct current converter station can be ensured, and the direct current power transmission system can be quickly started by the direct current converter station after the alternating current power grid resumes power supply, so that the power transmission reliability and the power transmission efficiency of the direct current converter station are improved.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (10)

1. A converter station power system wiring for configuring a security section, characterized by: including a plurality of load centers and can supply power to first power supply section (1), second power supply section (2), third power supply section (3), security section (4) of load center, first power supply section (1), second power supply section (2), third power supply section (3) are parallelly connected, third power supply section (3) are connected with first power supply section (1) through a triple circuit breaker (104), third power supply section (3) are connected with second power supply section (2) through two triple circuit breakers (204), every load center includes a plurality of working buses and a reserve bus, and is a plurality of be connected through the circuit breaker between the working buses, the reserve bus passes through the circuit breaker and is connected with a plurality of in the working buses, first power supply section (1), second power supply section (2) are connected with all working buses of every load center respectively through the dry-type transformer, security section (4) are connected with the reserve bus of every load center through the circuit breaker.
2. The power system wiring for a converter station equipped with a security section according to claim 1, wherein: the first power supply section (1) comprises a first power supply wire (101) for a station, a first working section (102), the second power supply section (2) comprises a second power supply wire (201) for a station, a second working section (202), the third power supply section (3) comprises a third power supply wire (301) for a station and a third working section (302), the first power supply wire (101) for a station is connected with the first working section (102) through a first power supply wire breaker (103), the second power supply wire (201) for a station is connected with the second working section (202) through a second power supply wire breaker (203), the third power supply wire (301) for a station is connected with the third working section (302) through a third power supply wire breaker (303), the third working section (302) is connected with the first working section (102) through a triple circuit breaker (104), the third working section (302) is connected with the second working section (202) through a second triple circuit breaker (204), and the first working section (102) and the second working section (202) are connected with a dry-type transformer.
3. The power system wiring for a converter station equipped with a security section according to claim 2, wherein: the safety section (4) comprises a safety power supply (401) and a safety bus (403), wherein the safety power supply (401) is connected with the safety bus (403) through a safety power supply main breaker (402), and the safety bus (403) is respectively connected with a standby bus of each load center through the breaker.
4. A converter station electrical system wiring with security segment configuration according to claim 3, characterized in that: the load centers comprise a first load center (5), a second load center (6) and a third load center (7);
the first load center (5) comprises a first bus (501), a second bus (502) and a seventh bus (503), wherein the first bus (501) and the second bus (502) are working buses, the seventh bus (503) is a standby bus, the first bus (501) is connected with the second bus (502) through a two-connection breaker (504), and the seventh bus (503) is connected with the first bus (501) through a seven-connection breaker (505);
the second load center (6) comprises a third bus (601), a fourth bus (602) and an eighth bus (603), wherein the third bus (601) and the fourth bus (602) are working buses, the eighth bus (603) is a standby bus, the third bus (601) is connected with the fourth bus (602) through a three-four-communication circuit breaker (604), and the eighth bus (603) is connected with the third bus (601) through a three-eight-communication circuit breaker (605);
the third load center (7) comprises a fifth bus (701), a sixth bus (702) and a ninth bus (703), wherein the fifth bus (701) and the sixth bus (702) are working buses, the ninth bus (703) is a standby bus, the fifth bus (701) is connected with the sixth bus (702) through a fifth-sixth contact breaker (704), and the ninth bus (703) is connected with the fifth bus (701) through a fifth-ninth contact breaker (705);
The first working section (102) is provided with a first outgoing line (105), a second outgoing line (108) and a third outgoing line (111), the first working section (102) is connected with a first bus (501), a fifth bus (701) and a third bus (601) respectively through the first outgoing line (105), the second outgoing line (108) and the third outgoing line (111), the first outgoing line (105) is provided with a first outgoing line breaker (106), a first dry-type transformer (107) and a first incoming line breaker (506), the second outgoing line (108) is provided with a second outgoing line breaker (109), a second dry-type transformer (110) and a second incoming line breaker (706), and the third outgoing line (111) is provided with a third outgoing line breaker (112), a third dry-type transformer (113) and a third incoming line breaker (606);
a fourth outgoing line (205), a fifth outgoing line (208) and a sixth outgoing line (211) are arranged on the second working section (202), the second working section (202) is respectively connected with a fourth bus (602), a second bus (502) and a sixth bus (702) through the fourth outgoing line (205), the fifth outgoing line (208) and the sixth outgoing line (211), a fourth outgoing line breaker (206), a fourth dry-type transformer (207) and a fourth incoming line breaker (607) are arranged on the fourth outgoing line (205), a fifth outgoing line breaker (209), a fifth dry-type transformer (210) and a fifth incoming line breaker (507) are arranged on the fifth outgoing line (208), and a sixth outgoing line breaker (212), a sixth dry-type transformer (213) and a sixth incoming line breaker (707) are arranged on the sixth outgoing line (211);
The safety bus (403) is provided with a first safety line (407), a second safety line (408) and a third safety line (409), the safety bus (403) is respectively connected with a seventh bus (503), an eighth bus (603) and a ninth bus (703) through the first safety line (407), the second safety line (408) and the third safety line (409), and the first safety line (407), the second safety line (408) and the third safety line (409) are respectively provided with a standby communication circuit breaker (404), a secondary communication circuit breaker (405) and a tertiary communication circuit breaker (406).
5. An operation method for wiring of a power system for a converter station provided with a security section is characterized in that: including first power supply section (1), second power supply section (2), third power supply section (3) all lose the first operating mode when electric, first operating mode includes: the safety section (4) supplies power to the standby buses of the plurality of load centers, the safety power supply (401) is started, the circuit breaker between the safety section (4) and the standby bus of each load center is switched on, the safety power supply main circuit breaker (402) is switched on, and all other circuit breakers are switched off.
6. The method of operating a power system connection for a converter station of a security segment of claim 5, wherein: the operation method comprises a second working condition in normal operation, wherein the second working condition comprises: the safety power supply (401) is closed, the first power supply section (1) and the second power supply section (2) supply power to a plurality of load centers, a three-circuit breaker (104) and two three-circuit breakers (204) are used for switching off, the breakers between the working buses of each load center are used for switching off, the safety section (4) is used for switching off the breakers between the standby buses of each load center, and the safety power supply main breaker (402) is used for switching off all other breakers.
7. The method of operating a power system connection for a converter station of a security segment of claim 5, wherein: the operation method comprises a third working condition when any two power supply sections lose power, wherein the third working condition comprises the following steps: the safety power supply (401) is closed, and one power supply section which is not powered off supplies power to a plurality of load centers;
when the third power supply section (3) loses electricity, the third power supply incoming line breaker (303) is opened, the power supply incoming line breaker on the other power supply section losing electricity is opened, the breaker between the security section (4) and the standby bus of each load center is opened, the security power supply main breaker (402) is opened, and all other breakers are closed.
When the third power supply section (3) is not powered off, the first power supply incoming line breaker (103) and the second power supply incoming line breaker (203) are switched off, the breakers between the working buses of each load center are switched off, the breakers between the security section (4) and the standby buses of each load center are switched off, the security power supply main breaker (402) is switched off, and all other breakers are switched on.
8. The method of operating a power system connection for a converter station of a security segment of claim 6, wherein: the operation method comprises a fourth working condition when any power supply section loses power, wherein the fourth working condition comprises the following steps: the safety power supply (401) is closed, and the other two power supply sections which are not in power failure supply power to the plurality of load centers:
When the third power supply section (3) is powered off, the switching-on and switching-off states of all the circuit breakers are the same as the second working condition in normal operation;
when the first power supply section (1) or the second power supply section (2) is powered off, a breaker between the third power supply section (3) and the powered off power supply section is switched on, and a power supply incoming line breaker of the powered off power supply section is switched off, and the switching-on and switching-off states of other breakers are the same as the second working condition in normal operation.
9. A method of operating a power system connection for a converter station equipped with a security section according to any one of claims 6 to 8, characterized in that: the operation method comprises a fifth working condition that the dry type transformer on the first power supply section (1) or the second power supply section (2) exits operation, wherein the fifth working condition comprises the following steps: the circuit breakers between the working bus bar of the load center and the adjacent working bus bar of the outgoing line connection corresponding to the dry-type transformer which is out of operation are switched on, the circuit breakers on the outgoing line corresponding to the dry-type transformer which is out of operation are switched off, and the switching-on and switching-off states of other circuit breakers are the same as the second working condition in normal operation.
10. A method of operating a power system connection for a converter station equipped with a security section according to any one of claims 6 to 8, characterized in that: the operation method comprises a sixth working condition that all dry transformers connected to the same load center are out of operation, wherein the sixth working condition comprises the following steps: the safety section (4) supplies power to a load center corresponding to the dry-type transformer which is out of operation, a safety power supply (401) is started, a safety power supply main breaker (402) is switched on, a breaker between a safety bus (403) and the load center corresponding to the dry-type transformer which is out of operation is switched on, in the load center corresponding to the dry-type transformer which is out of operation, a breaker between working buses and a breaker between a standby bus and the working buses are switched on, the breakers on an outgoing line corresponding to the dry-type transformer which is out of operation are switched off, and the switching-on and switching-off states of other breakers are the same as the second working condition in normal operation.
CN202211694246.4A 2022-12-28 2022-12-28 Current transformer station power system wiring and operation method with security section Active CN116031924B (en)

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