CN112332455A - Hydropower station black start system and method with double-voltage-level wiring - Google Patents
Hydropower station black start system and method with double-voltage-level wiring Download PDFInfo
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- CN112332455A CN112332455A CN202011316401.XA CN202011316401A CN112332455A CN 112332455 A CN112332455 A CN 112332455A CN 202011316401 A CN202011316401 A CN 202011316401A CN 112332455 A CN112332455 A CN 112332455A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
The invention relates to a hydropower station black start system and a hydropower station black start method of double-voltage-level wiring, which comprise a first hydraulic generator, a three-winding main transformer, a first 500kV circuit breaker, a second 220kV circuit breaker, a first 220kV circuit, a 500kV circuit breaker, a second 500kV circuit, a fourth 500kV circuit breaker, a third 500kV circuit, a high-voltage station transformer and a 10kV station service incoming line switch; all switches and knife switches on a black start path are closed, only a circuit breaker for supplying power to a line is kept in a disconnected state, a guide vane starting unit is opened by utilizing self-energy storage of a hydraulic generator, when the hydraulic generator is fixed to a rated rotating speed, an excitation system control mode is switched to an automatic mode, a main transformer with three windings of the hydraulic generator is enabled to build voltage to a rated voltage, a working power supply of a plant system is recovered in time, power transmission of a first 220kV line, power transmission of a second 500kV line and power transmission of a third 500kV electric line are sequentially achieved, the black start capability of a power grid is improved, and the safety of the plant network for dealing with extreme conditions is guaranteed.
Description
Technical Field
The invention belongs to the technical field of hydropower black start, and particularly relates to a hydropower station black start system and method with double-voltage-level wiring.
Background
With the change of global environment, extreme natural disasters frequently appear in recent years, which have great influence on the normal life of human beings, and how to ensure the stable, reliable and safe supply of electric power as the most basic requirement in the fields of industry, agriculture, resident life and the like is always the goal of fighting against the electric power work of various countries in the world. The power grid is constructed from the overall perspective, a strong power grid is constructed in a full power mode, various assessment systems are formulated, the power failure probability is reduced, the black start is just taken as the strong guarantee after the power grid has a safety accident, and no matter the power grid is the whole power grid or a local area power grid, after the power grid loses power, a unit with the capability can recover power transmission at the first time, and the power grid pressure is reduced. Therefore, policies are specially set in each local area network, black start is brought into the policy of auxiliary service, economic compensation is obtained for a power plant with black start capability every year, especially, a unit capable of helping the black start of the power grid in time after the power grid loses power, and the reward amplitude is larger. The currently known black start technology has the following problems: (1) the voltage grade of the output line is single, usually one voltage grade and one wiring structure, so that the recovery range is small during black start, and particularly for a large unit, the black start power supply capacity is weakened; (2) the two units are not connected by adopting an expansion unit, if the self-energy storage capacity of one unit is insufficient, the other unit cannot be started quickly under the condition of failed start, so that the black start time is prolonged, and meanwhile, the two units cannot realize a quick standby conversion function; (3) during black start, the excitation adopts a manual mode to empty the charging circuit, so that when the circuit is put into use, the voltage is automatically lifted, and potential safety hazards are brought to each electrical device.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the hydropower station black start system with double-voltage-level wiring, which can quickly send a power supply to the power grids with two voltage levels and structures when the power grids are in power failure, so that the recovery range is expanded, and the safety of the power grids is ensured.
The invention is realized by the following technical scheme:
a hydropower station black start system with double-voltage-level wiring comprises a first hydro-generator, a first 220kV line, a seventh 500kV disconnecting link, a second 500kV line, a tenth 500kV disconnecting link, a third 500kV line, a high-voltage station transformer, a 10kV station service incoming line switch and a 10kV bus;
one end of the first hydro-generator is connected with a first neutral point grounding disconnecting link, and the power generation end is connected with the first 220kV line through a first outlet circuit breaker, a first outlet disconnecting link, a second branch of a three-winding main transformer, a first 500kV disconnecting link, a second 500kV disconnecting link, a first 500kV circuit breaker, a third 500kV disconnecting link, a second 500kV bus, a fourth 500kV disconnecting link, a second 500kV circuit breaker, a fifth 500kV disconnecting link, a sixth 500kV disconnecting link, an interconnection transformer, a first 220kV disconnecting link, a first 220kV circuit breaker, a second 220kV disconnecting link, a first 220kV bus, a third 220kV disconnecting link, a second 220kV circuit breaker and a fourth 220kV disconnecting link in sequence;
one end T of the seventh 500kV disconnecting link is connected to a common point between the first 500kV disconnecting link and the second 500kV disconnecting link, and the other end of the seventh 500kV disconnecting link is connected with the second 500kV line through a third 500kV circuit breaker, an eighth 500kV disconnecting link and a ninth 500kV disconnecting link in sequence;
one end of the tenth 500kV disconnecting link is connected with the second 500kV bus, and the other end of the tenth 500kV disconnecting link is connected with the third 500kV line through a fourth 500kV circuit breaker, an eleventh 500kV disconnecting link and a twelfth 500kV disconnecting link in sequence;
one end of the high-voltage station transformer is connected with a first branch of the three-winding main transformer, and the other end of the high-voltage station transformer is connected with a 10kV bus through a 10kV station incoming line switch.
Preferably, the system also comprises a second hydro-generator, a thirteenth 500kV disconnecting link, a first 500kV bus, a fifth 220kV disconnecting link, a second 220kV bus and a sixth 220kV disconnecting link;
one end of the second hydraulic generator is connected with a second neutral point grounding disconnecting link, and the power generation end is connected with the first branch of the three-winding main transformer through a second outlet circuit breaker and a second outlet disconnecting link in sequence;
one end T of the thirteenth 500kV disconnecting link is connected to a common point between the eighth 500kV disconnecting link and the ninth 500kV disconnecting link, and the other end of the thirteenth 500kV disconnecting link is connected with the first 500kV bus through a fifth 500kV circuit breaker and a fourteenth 500kV disconnecting link in sequence;
one end of the fifth 220kV disconnecting link is connected with a common point between the first 220kV circuit breaker and the second 220kV disconnecting link, and the other end of the fifth 220kV disconnecting link is connected with the second 220kV bus;
one end of the sixth 220kV disconnecting link is connected with the second 220kV bus, and the other end of the sixth 220kV disconnecting link is connected with a common point between the third 220kV disconnecting link and the second 220kV circuit breaker.
Further, before the first hydro-generator and the three-winding main transformer with the first 220kV line, the second 500kV line and the third 500kV line are in black start, the first neutral point grounding switch, the first outlet disconnecting link, the first 500kV disconnecting link, the second 500kV disconnecting link, the first 500kV circuit breaker, the third 500kV disconnecting link, the fourth 500kV disconnecting link, the second 500kV circuit breaker, the fifth 500kV disconnecting link, the first 220kV circuit breaker, the second 220kV disconnecting link, the third 220kV disconnecting link, the fourth 220kV disconnecting link, the seventh 500kV disconnecting link, the eighth 500kV disconnecting link, the ninth 500kV disconnecting link, the tenth 500kV disconnecting link, the eleventh 500kV disconnecting link, the twelfth 500kV disconnecting link, the second neutral point grounding disconnecting link and the second outlet disconnecting link are all in a closed state; the first outlet circuit breaker, the second 220kV circuit breaker, the third 500kV circuit breaker, the fourth 500kV circuit breaker, the 10kV service incoming line switch, the second outlet circuit breaker, the thirteenth 500kV disconnecting link, the fifth 500kV circuit breaker, the fourteenth 500kV disconnecting link, the fifth 220kV disconnecting link and the sixth 220kV disconnecting link are all in an off state.
Further, when the first hydraulic generator and the three-winding main transformer charge the first 220kV line, the first outlet circuit breaker, the 10kV service incoming line switch and the second 220kV circuit breaker are in a closed state.
Further, when the first hydro-generator and the three-winding main transformer charge the second 500kV line, the third 500kV circuit breaker is in a closed state.
Further, when the first hydro-generator and the three-winding main transformer charge the third 500kV line, the fourth 500kV circuit breaker is in a closed state.
Furthermore, when the first hydraulic generator cannot be fixed in speed or build up pressure, the first outlet circuit breaker is disconnected, the second hydraulic generator is adjusted to be fixed in speed and build up pressure to a rated state, and the second outlet circuit breaker is closed.
A hydropower station black start method of double-voltage-level wiring comprises the following steps:
1) cooling the 10kV factory service incoming line switch for standby, and entering the step 2);
2) the second hydraulic generator is cooled for standby, and the step 3) is carried out;
3) exiting the primary frequency modulation function of the first hydraulic generator and entering the step 4);
4) exiting the reclosing of the first 220kV line, the second 500kV line and the third 500kV line, and entering the step 5);
5) sequentially disconnecting the first outlet circuit breaker, the second 220kV circuit breaker, the third 500kV circuit breaker, the fourth 500kV circuit breaker, the 10kV service incoming line switch, the second outlet circuit breaker, the fifth 500kV circuit breaker, the thirteenth 500kV disconnecting link, the fourteenth 500kV disconnecting link, the fifth 220kV disconnecting link and the sixth 220kV disconnecting link, and entering the step 6);
6) closing the first neutral point grounding disconnecting link, the first outlet disconnecting link, the first 500kV disconnecting link, the second 500kV disconnecting link, the third 500kV disconnecting link, the fourth 500kV disconnecting link, the fifth 500kV disconnecting link, the first 220kV disconnecting link, the second 220kV disconnecting link, the third 220kV disconnecting link, the fourth 220kV disconnecting link, the seventh 500kV disconnecting link, the eighth 500kV disconnecting link, the ninth 500kV disconnecting link, the tenth 500kV disconnecting link, the eleventh 500kV disconnecting link, the twelfth 500kV disconnecting link, the second neutral point grounding disconnecting link, the second outlet disconnecting link, the first 500kV circuit breaker, the second 500kV circuit breaker and the first 220kV circuit breaker in sequence, and entering the step 7);
7) exhausting the air shroud of the first hydraulic generator, checking and confirming that the indication of an air shroud pressure gauge is 0, and entering the step 8);
8) exiting the brake of the first hydraulic generator and entering the step 9);
9) pulling out the first hydraulic generator servomotor locking ingot, and entering step 10);
10) the first hydraulic generator is fixed at the speed of 200r/min, and the step 11) is carried out;
11) the first hydro-generator main transformer with three windings is boosted to 16.46kV in an AVR mode, and the step 12) is carried out;
12) closing the 10kV service incoming line switch, checking and confirming that the 10kV bus is 10kV, restoring the first hydraulic generator to operate with the 10kV bus, and entering the step 13);
13) closing the second 220kV circuit breaker, charging the first 220kV line, checking to confirm that the voltage of the first 220kV line is 220kV, and entering step 14);
14) closing the third 500kV circuit breaker, charging the second 500kV line, checking to confirm that the voltage of the second 500kV line is 527kV, and entering step 15);
15) closing the fourth 500kV circuit breaker, charging the third 500kV line, checking to confirm that the voltage of the third 500kV line is 527kV, and entering step 16);
16) and the first hydraulic generator and the three-winding main transformer are provided with the first 220kV circuit, the second 500kV circuit and the third 500kV circuit, and black start is finished.
Further, when the voltage is increased by AVR in the step 11), the first hydraulic generator low excitation limiting function is exited.
Further, when the black start in the step 16) is finished, the second 220kV circuit breaker, the third 500kV circuit breaker and the fourth 500kV circuit breaker are sequentially disconnected, the first water turbine generator is stopped from operating, and the rotating speed is 0.
According to the invention, all switches and disconnecting links on the black starting path are closed, only the circuit breaker for supplying power to the line is kept in an off state, the guide vane starting unit is opened by utilizing the self-energy storage of the hydraulic generator, when the hydraulic generator is in a constant speed to a rated rotating speed, the control mode of the excitation system is switched to an automatic mode, so that the main transformer with three windings of the hydraulic generator is charged to a rated voltage, the working power supply of the plant system is recovered in time, the power transmission of the first 220kV line, the power transmission of the second 500kV line and the power transmission of the third 500kV line are sequentially realized, the novel black starting system and the novel black starting method with the multi-voltage-grade and multi-wiring structure are provided for the power grid, the black starting capability of the power grid is improved, and the safety.
Furthermore, after the hydraulic generator is successfully started in a black mode, the power supply is sent out by using two wiring structure modes of three lines, three-half lines and double buses in total of 220kV and 500kV, the power supply and recovery range of the black start is expanded, the impact of heavy power failure on various places is reduced, and the power supply capacity of the hydraulic generator set is improved.
Furthermore, the two units are connected by the expansion unit, and are mutually standby during black start, so that when one unit cannot be started due to faults, the other unit can be quickly started by less operation, the risk of black start failure is reduced, the black start time is saved, and the unit can be quickly sent out under the fault condition.
Furthermore, the excitation of the invention adopts an automatic control mode, the hydraulic generator and the three-winding transformer are directly pressurized to the rated voltage, the problem of long operation time of manual mode grading zero-boost pressure is avoided, and meanwhile, when the circuit is put into operation, the automatic demagnetization deals with the magnetic assistance effect of capacitive current, the rated voltage is maintained, the problem of voltage lifting is prevented, and the safety of black start equipment is ensured.
Drawings
FIG. 1 is a schematic diagram of the black start principle of the present invention.
FIG. 2 is a schematic diagram of the present invention before black start.
Fig. 3 is a schematic diagram of the charging principle of the first hydro-generator and the three-winding main transformer on the second 500kV line.
Fig. 4 is a schematic diagram of the charging principle of the first hydro-generator and the three-winding main transformer on the third 500kV line.
Fig. 5 is a schematic diagram of the charging principle of the first hydro-generator and the three-winding main transformer on the third 500kV line.
In the figure: a first neutral point grounding disconnecting link 1; a first hydro-generator 2; a first outlet circuit breaker 3; a first exit knife gate 4; a three-winding main transformer 5; a first 500kV disconnecting link 6; a second 500kV disconnecting link 7; a first 500kV circuit breaker 8; a third 500kV disconnecting link 9; a second 500kV bus 10; a fourth 500kV disconnecting link 11; a second 500kV circuit breaker 12; a fifth 500kV disconnecting link 13; a sixth 500kV disconnecting link 14; a connection transformer 15; a first 220kV knife switch 16; a first 220kV circuit breaker 17; a second 220kV knife switch 18; a first 220kV bus 19; a third 220kV disconnecting link 20; a second 220kV circuit breaker 21; a fourth 220kV knife switch 22; a first 220kV line 23; a seventh 500kV disconnecting link 24; a third 500kV circuit breaker 25; an eighth 500kV disconnecting link 26; a ninth 500kV disconnecting link 27; a second 500kV line 28; a tenth 500kV disconnecting link 29; a fourth 500kV circuit breaker 30; an eleventh 500kV disconnecting link 31; a twelfth 500kV knife switch 32; a third 500kV line 33; a high voltage service transformer 34; 10kV service incoming line switch 35; a 10kV bus 36; a second neutral point grounding disconnecting link 37; a second hydro-generator 38; a second outlet breaker 39; a second exit knife gate 40; a thirteenth 500kV knife switch 41; a fifth 500kV circuit breaker 42; a fourteenth 500kV knife switch 43; a first 500kV bus 44; a fifth 220kV disconnecting link 45; a second 220kV bus 46; sixth 220kV knife-switch 47.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention can solve the black start problems of 220kV and 500kV hydropower stations with three-half voltage class, double buses and expansion unit wiring, in particular to the problems of single voltage class of a sending-out line, no standby of a black start unit and line charging rise in a manual excitation voltage mode in the black start.
The invention relates to a hydropower station black start system with double-voltage-level wiring, which comprises a first neutral point grounding disconnecting link 1, a first hydro-generator 2, a first outlet circuit breaker 3, a first outlet disconnecting link 4, a three-winding main transformer 5, a first 500kV disconnecting link 6, a second 500kV disconnecting link 7, a first 500kV circuit breaker 8, a third 500kV disconnecting link 9, a second 500kV bus 10, a fourth 500kV disconnecting link 11, a second 500kV circuit breaker 12, a fifth 500kV disconnecting link 13, a sixth 500kV disconnecting link 14, a connection transformer 15, a first 220kV disconnecting link 16, a first 220kV circuit breaker 17, a second 220kV disconnecting link 18, a first 220kV bus 19, a third 220kV disconnecting link 20, a second 220kV circuit breaker 21, a fourth 220kV disconnecting link 22, a first 220kV circuit 23, a seventh 500kV disconnecting link 24, a third 500kV circuit breaker 25, an eighth 500kV disconnecting link 26, a ninth 500kV disconnecting link 27, a ninth 500kV disconnecting link 28 and a second 500kV disconnecting link circuit 24, as shown in figure 1, A tenth 500kV disconnecting link 29, a fourth 500kV breaker 30, an eleventh 500kV disconnecting link 31, a twelfth 500kV disconnecting link 32, a third 500kV line 33, a high-voltage station transformer 34, a 10kV station incoming line switch 35 and a 10kV bus 36; one end of the first neutral point grounding disconnecting link 1 is connected with the first end, and the other end of the first neutral point grounding disconnecting link is connected with the first 220kV line 23 through a first water wheel generator 2, a first outlet circuit breaker 3, a first outlet disconnecting link 4, a second branch of a three-winding main transformer 5, a first 500kV disconnecting link 6, a second 500kV disconnecting link 7, a first 500kV circuit breaker 8, a third 500kV disconnecting link 9, a second 500kV bus 10, a fourth 500kV disconnecting link 11, a second 500kV circuit breaker 12, a fifth 500kV disconnecting link 13, a sixth 500kV disconnecting link 14, an interconnection transformer 15, a first 220kV disconnecting link 16, a first 220kV circuit breaker 17, a second 220kV disconnecting link 18, a first 220kV bus 19, a third 220kV disconnecting link 20, a second 220kV circuit breaker 21 and a fourth 220kV disconnecting link 22 in sequence; one end T of the seventh 500kV disconnecting link 24 is connected to a common point between the first 500kV disconnecting link 6 and the second 500kV disconnecting link 7, and the other end of the seventh 500kV disconnecting link is connected with the second 500kV line 28 through a third 500kV circuit breaker 25, an eighth 500kV disconnecting link 26 and a ninth 500kV disconnecting link 27 in sequence; one end of the tenth 500kV disconnecting link 29 is connected with the second 500kV bus 10, and the other end of the tenth 500kV disconnecting link is connected with the third 500kV line 33 through a fourth 500kV circuit breaker 30, an eleventh 500kV disconnecting link 31 and a twelfth 500kV disconnecting link 32 in sequence; one end of the high-voltage station transformer 34 is connected with a first branch of the three-winding main transformer 5, and the other end of the high-voltage station transformer is connected with a 10kV station incoming line switch 35 and a 10kV bus 3610kV bus 36.
In this embodiment, the three-winding main transformer further includes a second neutral point grounding disconnecting link 37, a second water-wheel generator 38, a second outlet circuit breaker 39, a second outlet disconnecting link 40, a thirteenth 500kV disconnecting link 41, a fifth 500kV circuit breaker 42, a fourteenth 500kV disconnecting link 43, a first 500kV bus 44, a fifth 220kV disconnecting link 45, a second 220kV bus 46 and a sixth 220kV disconnecting link 47, wherein one end of the second neutral point grounding disconnecting link 37 is grounded, and the other end of the second neutral point grounding disconnecting link is connected with the first branch of the three-winding main transformer 5 through the second water-wheel generator 38, the second outlet circuit breaker 39 and the second outlet disconnecting link 40 in sequence; one end T of the thirteenth 500kV disconnecting link 41 is connected to a common point between the eighth 500kV disconnecting link 26 and the ninth 500kV disconnecting link 27, and the other end of the thirteenth 500kV disconnecting link is connected with the first 500kV bus 44 through the fifth 500kV circuit breaker 42 and the fourteenth 500kV disconnecting link 43 in sequence; one end of the fifth 220kV disconnecting link 45 is connected with a common point between the first 220kV breaker 17 and the second 220kV disconnecting link 18, the other end of the fifth 220kV disconnecting link is connected with the second 220kV bus 46, one end of the sixth 220kV disconnecting link 47 is connected with the second 220kV bus 46, and the other end of the sixth 220kV disconnecting link is connected with a common point between the third 220kV disconnecting link 20 and the second 220kV breaker 21.
In this embodiment, the parameters of the first hydraulic generator 2 are as follows:
in this embodiment, the parameters of the three-winding main transformer 5 are as follows:
in this embodiment, the parameters of the interconnection transformer 15 are as follows:
| model number | SUB-MRT | Rated capacity | 750/750/30MVA |
| Rated voltage | 550/242/38.5kV | Rated frequency | 50Hz |
| Rated current | 787/1789/450A | Connecting set | Ynaod11 (autotransformer) |
| Manufacturer of the product | Mitsubishi Motor Co Ltd | Impedance HV-MV | 12.36％ |
| Impedance MV-LV | 98.00％ | Impedance HV-LV | 109.5％ |
In this embodiment, the parameters of the high-voltage station transformer 34 are as follows:
before the first hydro-generator 2 and the three-winding main transformer 5 with the first 220kV line 23, the second 500kV line 28, and the third 500kV line 33 are started, the first neutral point grounding switch 1, the first outlet switch 4, the first 500kV disconnecting link 6, the second 500kV disconnecting link 7, the first 500kV circuit breaker 8, the third 500kV disconnecting link 9, the fourth 500kV disconnecting link 11, the second 500kV circuit breaker 12, the fifth 500kV disconnecting link 13, the first 220kV disconnecting link 16, the first 220kV circuit breaker 17, the second 220kV disconnecting link 18, the third 220kV disconnecting link 20, the fourth 220kV disconnecting link 22, the seventh 500kV disconnecting link 24, the eighth 500kV disconnecting link 26, the ninth 500kV disconnecting link 27, the tenth 500kV disconnecting link 29, the eleventh 500kV disconnecting link 31, the twelfth 500kV disconnecting link 32, the second neutral point grounding switch 37, and the second outlet disconnecting link 40 are all in a closed state; the first outlet circuit breaker 3, the second 220kV circuit breaker 21, the third 500kV circuit breaker 25, the fourth 500kV circuit breaker 30, the 10kV service incoming line switch 35, the second outlet circuit breaker 39, the thirteenth 500kV disconnecting link 41, the fifth 500kV circuit breaker 42, the fourteenth 500kV disconnecting link 43, the fifth 220kV disconnecting link 45 and the sixth 220kV disconnecting link 47 are all in an off state.
As shown in fig. 3, when the first hydraulic generator 2 and the three-winding main transformer 5 charge the first 220kV line 23, the first outlet circuit breaker 3, the 10kV service incoming line switch 35 and the second 220kV circuit breaker 21 are in a closed state, the terminal voltage of the first hydraulic generator 2 is 16.46kV, the terminal current is 3.81kA, the excitation voltage is 50V, the excitation current is 365A, the voltage of the 10kV bus is 10kV, and the high-voltage side voltage of the three-winding main transformer 5 is 527 kV.
As shown in fig. 4, when the first hydro-generator 2 and the three-winding main transformer 5 charge the second 500kV line 28, the third 500kV circuit breaker 25 is in a closed state.
As shown in fig. 5, when the first hydro-generator 2 and the three-winding main transformer 5 charge the third 500kV line 33, the fourth 500kV circuit breaker 30 is in a closed state.
In this embodiment, when the first water turbine generator 2 cannot perform constant speed or build up voltage, the first outlet breaker 3 is opened, the second water turbine generator 38 is adjusted to perform constant speed and build up voltage to a rated state, and the second outlet breaker 39 is closed.
A hydropower station black start method of double-voltage-level wiring comprises the following steps:
1) cooling the 10kV factory inlet wire switch 35 for standby, and entering the step 2);
2) the second hydraulic generator 38 is cooled for standby, and the step 3) is carried out;
3) exiting the primary frequency modulation function of the first hydraulic generator 2 and entering the step 4);
4) exiting the reclosing of the first 220kV line 23, the second 500kV line 28 and the third 500kV line 33, and entering the step 5);
5) sequentially disconnecting the first outlet circuit breaker 3, the second 220kV circuit breaker 21, the third 500kV circuit breaker 25, the fourth 500kV circuit breaker 30, the 10kV service incoming line switch 35, the second outlet circuit breaker 39, the fifth 500kV circuit breaker 42, the thirteenth 500kV disconnecting link 41, the fourteenth 500kV disconnecting link 43, the fifth 220kV disconnecting link 45 and the sixth 220kV disconnecting link 47, and entering the step 6);
6) closing the first neutral point grounding disconnecting link 1, the first outlet disconnecting link 4, the first 500kV disconnecting link 6, the second 500kV disconnecting link 7, the third 500kV disconnecting link 9, the fourth 500kV disconnecting link 11, the fifth 500kV disconnecting link 13, the first 220kV disconnecting link 16, the second 220kV disconnecting link 18, the third 220kV disconnecting link 20, the fourth 220kV disconnecting link 22, the seventh 500kV disconnecting link 24, the eighth 500kV disconnecting link 26, the ninth 500kV disconnecting link 27, the tenth 500kV disconnecting link 29, the eleventh 500kV disconnecting link 31, the twelfth 500kV disconnecting link 32, the second neutral point grounding disconnecting link 37, the second outlet disconnecting link 40, the first 500kV circuit breaker 8, the second 500kV circuit breaker 12 and the first 220kV circuit breaker 17 in sequence, and entering the step 7);
7) exhausting air from the air shroud of the first hydraulic generator 2, checking and confirming that the indication of an air shroud pressure gauge is 0, and entering the step 8);
8) the brake of the first hydraulic generator 2 is withdrawn, and the step 9) is carried out;
9) pulling out the servomotor locking ingot of the first hydraulic generator 2, and entering the step 10);
10) the first hydraulic generator 2 is fixed at the speed of 200r/min, and the step 11) is carried out;
11) the main transformer 5 with three windings of the first hydraulic generator 2 is boosted to 16.46kV in an AVR mode, and the step 12) is carried out;
12) closing the 10kV service incoming line switch 35, checking and confirming that the 10kV bus 36 is 10kV, recovering the first hydraulic generator 2 to operate with the 10kV bus 36, and entering the step 13);
13) closing the second 220kV circuit breaker 21, charging the first 220kV line 23, checking to confirm that the voltage of the first 220kV line 23 is 220kV, and entering step 14);
14) closing the third 500kV circuit breaker 25, charging the second 500kV line 28, checking to confirm that the voltage of the second 500kV line 28 is 527kV, and entering step 15);
15) closing the fourth 500kV circuit breaker 30, charging the third 500kV line 33, checking to confirm that the voltage of the third 500kV line 33 is 527kV, and entering step 16);
16) and the first hydraulic generator 2 and the three-winding main transformer 5 are provided with the first 220kV line 23, the second 500kV line 28 and the third 500kV line 33 for black start ending.
In this embodiment, when the voltage is increased by AVR in step 11), the low excitation limiting function of the first hydraulic generator 2 is exited; and 16) when the black start is finished, sequentially disconnecting the second 220kV circuit breaker 21, the third 500kV circuit breaker 25 and the fourth 500kV circuit breaker 30, and stopping the operation of the first water turbine generator 2 at a rotating speed of 0.
The invention relates to a hydropower station black start system and a hydropower station black start method of double-voltage-level wiring, which comprise a first hydraulic generator, a three-winding main transformer, a first 500kV circuit breaker, a second 220kV circuit breaker, a first 220kV circuit, a 500kV circuit breaker, a second 500kV circuit, a fourth 500kV circuit breaker, a third 500kV circuit, a high-voltage station transformer and a 10kV station service incoming line switch; all switches and knife switches on a black start path are closed, only a circuit breaker for supplying power to a line is kept in an off state, a guide vane starting unit is opened by utilizing self-energy storage of a hydraulic generator, when the hydraulic generator is fixed to a rated rotating speed, an excitation system control mode is switched to an automatic mode, a main transformer with three windings of the hydraulic generator is enabled to build voltage to rated voltage, a plant system working power supply is recovered in time, first 220kV line power transmission, second 500kV line power transmission and third 500kV line power transmission are sequentially realized, a novel black start system and a novel black start method with a multi-voltage grade and multi-wiring structure are provided for a power grid, the black start capacity of the power grid is improved, and the safety of the plant grid for dealing with extreme conditions is guaranteed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A hydropower station black start system with double-voltage-level wiring is characterized by comprising a first hydro-generator (2), a first 220kV line (23), a seventh 500kV disconnecting link (24), a second 500kV line (28), a tenth 500kV disconnecting link (29), a third 500kV line (33), a high-voltage service transformer (34), a 10kV service incoming line switch (35) and a 10kV bus (36);
one end of the first hydro-generator (2) is connected with a first neutral point grounding disconnecting link (1), and the power generation end sequentially passes through a first outlet circuit breaker (3), a first outlet disconnecting link (4), a second branch of a three-winding main transformer (5), a first 500kV disconnecting link (6), a second 500kV disconnecting link (7), a first 500kV circuit breaker (8), a third 500kV disconnecting link (9), a second 500kV bus (10), a fourth 500kV disconnecting link (11) and a second 500kV circuit breaker (12), a fifth 500kV disconnecting link (13), a sixth 500kV disconnecting link (14), an interconnection transformer (15), a first 220kV disconnecting link (16), a first 220kV circuit breaker (17), a second 220kV disconnecting link (18), a first 220kV bus (19), a third 220kV disconnecting link (20), a second 220kV circuit breaker (21) and a fourth 220kV disconnecting link (22) are connected with the first 220kV line (23);
one end T of the seventh 500kV disconnecting link (24) is connected to a common point between the first 500kV disconnecting link (6) and the second 500kV disconnecting link (7), and the other end of the seventh 500kV disconnecting link (24) is connected with the second 500kV line (28) through a third 500kV circuit breaker (25), an eighth 500kV disconnecting link (26) and a ninth 500kV disconnecting link (27) in sequence;
one end of the tenth 500kV disconnecting link (29) is connected with the second 500kV bus (10), and the other end of the tenth 500kV disconnecting link is connected with the third 500kV line (33) through a fourth 500kV circuit breaker (30), an eleventh 500kV disconnecting link (31) and a twelfth 500kV disconnecting link (32) in sequence;
one end of the high-voltage station transformer (34) is connected with a first branch of the three-winding main transformer (5), and the other end of the high-voltage station transformer is connected with a 10kV bus (36) and a 10kV incoming line switch (35) through the 10kV station and the 10kV bus (36).
2. A dual voltage class wired hydropower station black start system according to claim 1, further comprising a second hydro generator (38), a thirteenth 500kV disconnecting link (41), a first 500kV busbar (44), a fifth 220kV disconnecting link (45), a second 220kV busbar (46) and a sixth 220kV disconnecting link (47);
one end of the second water wheel generator (38) is connected with a second neutral point grounding disconnecting link (37), and the power generation end is connected with a first branch of the three-winding main transformer (5) through a second outlet circuit breaker (39) and a second outlet disconnecting link (40) in sequence;
one end T of the thirteenth 500kV disconnecting link (41) is connected to a common point between the eighth 500kV disconnecting link (26) and the ninth 500kV disconnecting link (27), and the other end of the thirteenth 500kV disconnecting link (41) is connected with the first 500kV bus (44) through a fifth 500kV circuit breaker (42) and a fourteenth 500kV disconnecting link (43) in sequence;
one end of the fifth 220kV disconnecting link (45) is connected with a common point between the first 220kV circuit breaker (17) and the second 220kV disconnecting link (18), and the other end of the fifth 220kV disconnecting link is connected with the second 220kV bus (46);
one end of the sixth 220kV disconnecting link (47) is connected with the second 220kV bus (46), and the other end of the sixth 220kV disconnecting link is connected with a common point between the third 220kV disconnecting link (20) and the second 220kV circuit breaker (21).
3. The black start system of a hydropower station with double-voltage-class wiring according to claim 2, wherein the first neutral point grounding switch (1), the first outlet switch (4), the first 500kV switch (6), the second 500kV switch (7), the first 500kV breaker (8), the third 500kV switch (9), the fourth 500kV switch (11), the second 500kV breaker (12), the fifth 500kV switch (13), the first 220kV switch (16), the first 220kV breaker (17), the second 220kV switch (18), the third 220kV switch (20), the fourth 220kV switch (22), the seventh 500kV switch (24), and the third 500kV switch (33) are performed before the black start of the first hydro-generator (2) and the three-winding main transformer (5) with the first 220kV line (23), the second 500kV line (28) and the third 500kV line (33) is performed, The eighth 500kV disconnecting link (26), the ninth 500kV disconnecting link (27), the tenth 500kV disconnecting link (29), the eleventh 500kV disconnecting link (31), the twelfth 500kV disconnecting link (32), the second neutral point grounding disconnecting link (37) and the second outlet disconnecting link (40) are all in a closed state; the first outlet circuit breaker (3), the second 220kV circuit breaker (21), the third 500kV circuit breaker (25), the fourth 500kV circuit breaker (30), the 10kV service incoming line switch (35), the second outlet circuit breaker (39), the thirteenth 500kV disconnecting link (41), the fifth 500kV circuit breaker (42), the fourteenth 500kV disconnecting link (43), the fifth 220kV disconnecting link (45) and the sixth 220kV disconnecting link (47) are all in an off state.
4. A dual voltage class wired hydropower station black start system according to claim 3, wherein the first outlet circuit breaker (3), the 10kV service inlet switch (35), the second 220kV circuit breaker (21) are in a closed state when the first hydro generator (2) and the three winding main transformer (5) charge the first 220kV line (23).
5. A dual voltage class wired hydropower station black start system according to claim 4, wherein the third 500kV circuit breaker (25) is in a closed state when the first hydro-generator (2) and the three winding main transformer (5) charge the second 500kV line (28).
6. A dual voltage class wired black start system for a hydroelectric power station according to claim 5, wherein said fourth 500kV circuit breaker (30) is in a closed state when said first hydro-generator (2) and said three winding main transformer (5) are charging said third 500kV line (33).
7. The hydropower station black start system of double voltage level wiring according to claim 6, wherein when the first hydro-generator (2) cannot be fixed in speed or build up voltage, the first outlet breaker (3) is opened, the second hydro-generator (38) is adjusted in speed and build up voltage to a rated state, and the second outlet breaker (39) is closed.
8. A hydropower station black start method of double-voltage-level wiring is characterized by comprising the following steps:
1) the 10kV factory service incoming line switch (35) is cooled for standby, and the step 2) is carried out;
2) the second hydraulic generator (38) is cooled for standby, and the step 3) is carried out;
3) exiting the primary frequency modulation function of the first hydraulic generator (2) and entering the step 4);
4) the first 220kV line (23), the second 500kV line (28) and the third 500kV line (33) are closed again, and the step 5 is carried out;
5) sequentially disconnecting the first outlet circuit breaker (3), the second 220kV circuit breaker (21), the third 500kV circuit breaker (25), the fourth 500kV circuit breaker (30), the 10kV service incoming line switch (35), the second outlet circuit breaker (39), the fifth 500kV circuit breaker (42), the thirteenth 500kV disconnecting link (41), the fourteenth 500kV disconnecting link (43), the fifth 220kV disconnecting link (45) and the sixth 220kV disconnecting link (47), and entering the step 6;
6) closing the first neutral point grounding disconnecting link (1), the first outlet disconnecting link (4), the first 500kV disconnecting link (6), the second 500kV disconnecting link (7), the third 500kV disconnecting link (9), the fourth 500kV disconnecting link (11), the fifth 500kV disconnecting link (13), the first 220kV disconnecting link (16), the second 220kV disconnecting link (18), the third 220kV disconnecting link (20), the fourth 220kV disconnecting link (22), the seventh 500kV disconnecting link (24), the eighth 500kV disconnecting link (26), the ninth 500kV disconnecting link (27), the tenth 500kV disconnecting link (29), the eleventh 500kV disconnecting link (31), the twelfth 500kV disconnecting link (32), the second neutral point grounding disconnecting link (37), the second outlet disconnecting link (40), the first 500kV circuit breaker (8), the second 500kV circuit breaker (12) and the first 220kV circuit breaker (17) in sequence, and entering the step 7);
7) exhausting air in the air shroud of the first hydraulic generator (2), checking and confirming that the indication of an air shroud pressure gauge is 0, and entering the step 8);
8) the brake of the first hydraulic generator (2) is withdrawn, and the step 9) is carried out;
9) pulling out the servomotor lock ingot of the first hydraulic generator (2), and entering step 10);
10) the first hydraulic generator (2) is fixed at the speed of 200r/min, and the step 11) is carried out;
11) the main transformer (5) with three windings of the first hydraulic generator (2) is boosted to 16.46kV in an AVR mode, and the step 12) is carried out;
12) closing the 10kV service incoming line switch (35), checking and confirming that the 10kV bus (36) is 10kV, recovering the first hydraulic generator (2) to operate with the 10kV bus (36), and entering the step 13);
13) closing the second 220kV circuit breaker (21), charging the first 220kV line (23), checking to confirm that the voltage of the first 220kV line (23) is 220kV, and entering step 14);
14) closing the third 500kV circuit breaker (25), charging the second 500kV line (28), checking to confirm that the voltage of the second 500kV line (28) is 527kV, and entering step 15);
15) closing the fourth 500kV circuit breaker (30), charging the third 500kV line (33), checking to confirm that the voltage of the third 500kV line (33) is 527kV, and entering step 16);
16) and the first hydraulic generator (2) and the three-winding main transformer (5) are provided with the first 220kV line (23), the second 500kV line (28) and the third 500kV line (33) for black start ending.
9. The black start method of a hydropower station wired according to claim 8, wherein the low excitation limiting function of the first hydro-generator (2) is exited when the voltage is increased by AVR in the step 11).
10. The hydropower station black start method of the double-voltage-class wiring according to claim 8, wherein the step 16) is implemented by sequentially disconnecting the second 220kV circuit breaker (21), the third 500kV circuit breaker (25) and the fourth 500kV circuit breaker (30) at the end of the black start, and stopping the operation of the first water-wheel generator (2) at a rotating speed of 0.
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| CN202011316401.XA CN112332455A (en) | 2020-11-19 | 2020-11-19 | Hydropower station black start system and method with double-voltage-level wiring |
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| CN202011316401.XA CN112332455A (en) | 2020-11-19 | 2020-11-19 | Hydropower station black start system and method with double-voltage-level wiring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113391128A (en) * | 2021-06-24 | 2021-09-14 | 广州卓博机电科技有限公司 | Generator stator winding insulation resistance detection device, method, system and medium |
| CN113422383A (en) * | 2021-05-07 | 2021-09-21 | 大唐水电科学技术研究院有限公司 | System and method for processing excess electric energy of hydropower station |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422383A (en) * | 2021-05-07 | 2021-09-21 | 大唐水电科学技术研究院有限公司 | System and method for processing excess electric energy of hydropower station |
| CN113391128A (en) * | 2021-06-24 | 2021-09-14 | 广州卓博机电科技有限公司 | Generator stator winding insulation resistance detection device, method, system and medium |
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