CN112311013A - 110kV system assisted 500kV system thermal power generating unit black start system and method - Google Patents
110kV system assisted 500kV system thermal power generating unit black start system and method Download PDFInfo
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- CN112311013A CN112311013A CN202011306652.XA CN202011306652A CN112311013A CN 112311013 A CN112311013 A CN 112311013A CN 202011306652 A CN202011306652 A CN 202011306652A CN 112311013 A CN112311013 A CN 112311013A
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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
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
Abstract
The invention discloses a 110kV system auxiliary 500kV system thermal power generating unit black start system and a method, which comprise a 110kV system bus, a 500kV system and a thermal power generator, wherein the 110kV system bus and the 500kV system are connected through a first three-winding transformer and a second three-winding transformer. The method comprises the steps that a safety diesel generator of the thermal power generator is put into a thermal power generator by simulating power loss of a 500kV system, the safety diesel generator is in a hot standby state, the reverse power is jumped in the on process of the thermal power generating unit to realize an electric trip function, service power is further switched, safety of auxiliary machines for the service of the thermal power generating unit is guaranteed, the thermal power generating unit supplies power by means of a 110kV system bus to carry out ignition, impulse rotation, constant speed and voltage building of the thermal power generating unit, the thermal power generating unit is synchronously connected to the 110kV system through a 6kV low-voltage system, then a 110kV system power switch is switched off, stable operation of the service power of the thermal power generating unit with the service power is realized; when the 110kV system loses power, the 500kV system recovers the power supply of the 110kV system through the second three-winding transformer and the first three-winding transformer.
Description
Technical Field
The invention belongs to the technical field of black start of thermal power plants, and particularly relates to a 110kV system auxiliary 500kV system thermal power generating unit black start system and method.
Background
The hydroelectric power and the gas turbine have unique natural advantages and become a black start power supply point of a first echelon for black start of a power system in China, but as is known, the limited hydroelectric power and the limited gas turbine of the first echelon are not enough to support load supply of a huge power grid, one of main purposes of the black start power supply of the first echelon of the power system is to quickly restore power supply for the whole grid and important load power supply, and the other purpose is to ignite a unit consuming primary energy of a second echelon. The thermal power generating unit with the largest proportion in the primary energy generating units is the thermal power generating unit, generally speaking, the thermal power generating unit does not have black start capability, after part of the thermal power generating units are transformed through FCB island operation, namely after a power grid loses power, the thermal power generating units are rapidly transformed into power supply operation with the power generators, and wait for adjustment to send out power supplies. The standby power supply is configured for the thermal power generating units in China and connected to the same network with the power supply sent out from the generator end, so that the standby power supply and the power supply sending out line can be simultaneously powered off after the power grid is powered off, the standby power supply is required to provide energy in the starting process of the thermal power generating units, and after the power grid is powered off, the power supply of the first echelon mainly supplies power to the standby power supply of the second echelon, and the power supply can be smoothly ignited, rushed to rotate and build voltage after the power grid is normally operated. China has two power grid systems, namely a 110kV system and a 500kV system, the two power grid systems are different in power supply type due to different geographic environments, the probability of simultaneous power loss of the two power grids is very low, and no accident of simultaneous power loss occurs within dozens of years of running time. The prior known thermal black start technology has the following problems: (1) at present, thermal power black start is mostly implemented in an FCB (flexible circuit board) self-contained service island operation mode, and the mode has the problems of high control difficulty, long-term stable operation of an island and the like; (2) at present, when a thermal power unit carries out black-start FCB island operation, the black-start FCB island operation is mostly realized in a boiler bypass load shedding mode, namely, the thermal power unit is instantly changed into self-provided service power low-load operation after power loss under the condition of a high-load state, and a case that the thermal power unit is sent from low load to high load under the condition of black start is not seen; (3) at present, relevant literature data about the fact that thermal power generating units participate in black start mutual starting of two power grids is not seen.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a 110kV system auxiliary 500kV system thermal power generating unit black start system and a method, which realize black start coordination under the condition of power failure of two power grids, stabilize the constructed power grid and reduce the influence caused by power failure of the power grid.
The invention is realized by the following technical scheme:
a black start system of a thermal power generating unit of a 500kV system assisted by a 110kV system comprises a 110kV system bus, a first three-winding transformer, a first 6kV bus, a second three-winding transformer, a thermal power generator and the 500kV system;
one end of a 110kV system bus is connected with a 110kV system, the other end of the 110kV system bus is connected with the high-voltage side of a first three-winding transformer through a first 110kV disconnecting link, a 100kV circuit breaker and a second 110kV disconnecting link in sequence, a low-voltage side A branch of the first three-winding transformer is connected with a first 6kV bus through a first 6kV switch, and a low-voltage side B branch of the first three-winding transformer is connected with a second 6kV bus through a second 6kV switch;
the first 6kV bus is connected with a branch A at the low-voltage side of the second three-winding transformer through a third 6kV switch, the second 6kV bus is connected with a branch B at the low-voltage side of the second three-winding transformer through a fourth 6kV switch, and the high-voltage side of the second three-winding transformer is connected with the 500kV system through a main transformer, a 500kV circuit breaker and a 500kV disconnecting link in sequence;
and the output end of the thermal power generator is connected with the high-voltage side of the second three-winding transformer.
Preferably, the device further comprises a first grounding disconnecting link and a second grounding disconnecting link;
one end of the first grounding disconnecting link is connected with a neutral point of the thermal power generator, and the other end of the first grounding disconnecting link is connected with the ground through a grounding resistor;
one end of the second grounding disconnecting link is connected with the neutral point of the high-voltage side of the first three-winding transformer, the other end of the second grounding disconnecting link is connected with the ground, and the neutral point of the high-voltage side of the main transformer is directly connected with the ground.
3. The black start system of the thermal power generating unit of the 500kV system assisted by the 110kV system as claimed in claim 2, wherein a bus of the 110kV system runs normally, and when the 500kV system loses power, the first 110kV disconnecting link, the 100kV circuit breaker, the second 110kV disconnecting link, the fourth 6kV switch, the third 6kV switch, the second grounding disconnecting link, the first grounding disconnecting link, the 500kV circuit breaker and the 500kV disconnecting link are all in a closed state; the thermal power generator is shut down, the 500kV circuit breaker, the fourth 6kV switch and the third 6kV switch are disconnected, and the second 6kV switch and the first 6kV switch are closed.
Further, when the thermal power generator is started in black, the thermal power generator is connected to the 110kV system bus in a grid mode, the fourth 6kV switch is closed, the second 6kV switch and the first 6kV switch are disconnected, the thermal power generator is operated in an isolated power plant mode, the 500kV circuit breaker is closed, and the 500kV system is powered by the thermal power generator.
Further, when 110kV system generating line loses electricity, 500kV system operation is normal, first 110kV switch, 100kV circuit breaker, second 110kV switch, fourth 6kV switch, third 6kV switch, first ground connection switch, 500kV circuit breaker, 500kV switch and second ground connection switch are all in the closure state, second 6kV switch and first 6kV switch are closed, 110kV system generating line resume by 500kV system power supply.
A black start method of a thermal power generating unit of a 500kV system assisted by a 110kV system comprises the following steps:
1) putting the thermal power generator security diesel generator into a hot standby state, and entering the step 2);
2) stopping the thermal power generator by using a trip reverse power mode, and entering a step 3);
3) opening the 500kV circuit breaker, and entering the step 4);
4) opening a magnetic-extinguishing switch of the thermal power generator, and entering the step 5);
5) the third 6kV switch is switched off, and the step 6) is carried out;
6) the fourth 6kV switch is switched off, and the step 7) is carried out;
7) switching on the first 6kV switch, and entering the step 8);
8) switching on the second 6kV switch, and entering the step 9);
9) confirming the non-pressure states of the thermal power generator and the main transformer, and entering the step 10);
10) confirming that the 110kV system bus operates normally, and entering step 11);
11) the speed of the thermal power generator is rushed to 3000r/min, and the step 12) is carried out;
12) building a voltage of 20kV at the end of the thermal power generator, and entering step 13);
13) closing the third 6kV switch by using a synchronous device, and entering step 14);
14) manually closing the fourth 6kV switch, and entering step 15);
15) manually opening the first 6kV switch, and entering the step 16);
16) manually disconnecting the second 6kV switch, and entering step 17);
17) the thermal power generator carries out load maintenance on an island operation by the transformer with the second third winding, and the step 18) is carried out;
18) and closing the 500kV circuit breaker, and recovering the thermal power generator to supply power for the 500kV system.
Further, in the step 1), the security diesel generator is started to be in an idle mode, the voltage is built to be 400V, and the security diesel generator is adjusted to be in a hot standby state.
Further, the thermal power generator is stopped in the step 2) by using a trip reverse power mode, and the thermal power generator protection device automatically starts the fast switching device to switch the working power supply and the standby power supply.
Further, the synchronization device in step 13) adjusts and captures the time of the same frequency, same voltage and same phase of the secondary side signals of the third 6kV switch and the first 6kV switch voltage transformer, and closes the third 6kV switch.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a safety diesel generator of a thermal power generator, which is put into a thermal power generator by simulating the power loss of a 500kV system to ensure that the diesel generator is in a hot standby state, the reverse power is jumped in the on-process of a thermal power unit to realize the function of electric trip, the service power is further switched, the safety of auxiliary machines for the service of the thermal power unit is ensured, the thermal power unit provides power by virtue of a 110kV system bus to realize the ignition, the impact, the constant speed and the voltage build-up of the thermal power unit, and the thermal power unit is connected to the 110kV system by a 6kV low-voltage system through the synchronous realization, and then a 110kV system power switch is switched off to realize the stable operation of the service power of the thermal; when the 110kV system loses power, the 500kV system recovers the power supply of the 110kV system through the second three-winding transformer and the first three-winding transformer; the invention provides a novel thermal black start system and a novel thermal black start method, which help a power grid to quickly get rid of adverse conditions under extreme conditions, recover normal operation of the power grid and reduce influence on human production and life.
Furthermore, the safety diesel generator set is started when the system is in black start, so that failure in switching of a plant power supply is prevented, auxiliary machines of the thermal generator are powered off, and the main body of the equipment is prevented from being damaged.
Furthermore, the method simulates the power loss of a 500kV system, and the safety shutdown of the thermal power generating unit is realized by the trip reverse power, so that the turbine overspeed caused by the shutdown without closing the main throttle valve is prevented, the service power switching of the thermal power generating unit is realized quickly, and the safety of main equipment of the thermal power generating unit is guaranteed.
Further, the invention provides a black-start power supply for the thermal power unit by using the 110kV system, after the thermal power unit is successfully black-started, the 110kV system and the 500kV system are interconnected in a synchronous mode, the 110kV system is quitted, the stable operation of the thermal power unit from low load to high load with station power is realized, the thermal power unit is further sent out to the 500kV system, and the power restoration of the 500kV system is realized.
Furthermore, under the condition that the 110kV system is in power failure, the 500kV system supplies power to the 110kV system through the second three-winding transformer and the first three-winding transformer, and black start of the 500kV system power-assisted 110kV system is achieved.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Fig. 2 is a schematic diagram of the principle of simulating the power loss of a 500kV system in the invention.
FIG. 3 is a schematic diagram of the black start 500kV system of the 110kV system of the present invention.
FIG. 4 is a schematic diagram of the 500kV system black start 110kV system principle of the present invention.
Fig. 5 is a terminal voltage waveform at the black start of the thermal generator according to the present invention.
In the figure: 1-110kV system bus; 2-a first 110kV disconnecting link; 3-100kV circuit breakers; 4-a second 110kV disconnecting link; 5-a first three-winding transformer; 6-a second 6kV switch; 7-a first 6kV switch; 8-a second 6kV bus; 9-a first 6kV bus; 10-fourth 6kV switch; 11-a third 6kV switch; 12-a second three-winding transformer; 13-ground resistance; 14-a first grounding switch; 15-a thermal generator; 16-a main transformer; 17-500kV circuit breakers; 18-500kV disconnecting link; 19-500kV system; 20-second grounding knife switch.
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 technical problem of thermal black start, after the 500kV system loses power, the 110kV system is used for starting the thermal generator, and the power supply of the 500kV system is further recovered; meanwhile, after the 110kV system loses power, the 500kV system can be used for assisting the 110kV system to recover power supply. The method can realize that the thermal power generating unit is started by using the 110kV system under the condition that the 500kV system loses power, and the 500kV system is recovered to supply power; under the condition that a 110kV system loses power, the 500kV system is utilized to assist the 110kV system to recover power supply, the invention provides a novel thermal power black start technology, and the black start coordination under the condition that two power grids lose power is realized, so that a strong power grid is constructed, and the influence and loss of the power grid power failure on the whole society are reduced.
The invention relates to a black start system of a thermal power generating unit of an auxiliary 500kV system of a 110kV system, which comprises a 110kV system bus 1, a first three-winding transformer 5, a first 6kV bus 9, a second three-winding transformer 12, a thermal power generator 15 and a 500kV system 19, wherein the first three-winding transformer 5 is connected with the 110kV system bus;
one end of a 110kV system bus 1 is connected with a 110kV system, the other end of the 110kV system bus is connected with the high-voltage side of a first three-winding transformer 5 through a first 110kV disconnecting link 2, a 100kV circuit breaker 3 and a second 110kV disconnecting link 4 in sequence, a low-voltage side A branch of the first three-winding transformer 5 is connected with a first 6kV bus 9 through a first 6kV switch 7, and a low-voltage side B branch of the first three-winding transformer 5 is connected with a second 6kV bus 8 through a second 6kV switch 6;
the first 6kV bus 9 is connected with a low-voltage side A branch of the second third winding transformer 12 through a third 6kV switch 11, the second 6kV bus 8 is connected with a low-voltage side B branch of the second third winding transformer 12 through a fourth 6kV switch 10, and the high-voltage side of the second third winding transformer 12 is connected with the 500kV system 19 through a main transformer 16, a 500kV circuit breaker 17 and a 500kV disconnecting link 18 in sequence;
the output end of the thermal power generator 15 is connected with the high-voltage side of the second third winding transformer 12; the rated capacity of the thermal power generator 15 is 300MW, the 110kV system bus 1 is connected with a 110 kV-level power grid, the 500kV system bus 19 is connected with 500 kV-level voltage, and the 110kV system bus 1 is used for starting the thermal power generator 15 and recovering the 500kV system 19 after the 500kV system 19 loses power.
In this embodiment, the device further includes a first grounding switch 14 and a second grounding switch 20;
one end of the first grounding disconnecting link 14 is connected with a neutral point of the thermal power generator 15, and the other end of the first grounding disconnecting link is connected with the ground through a grounding resistor 13;
one end of the second grounding disconnecting link 20 is connected with a neutral point on the high-voltage side of the first three-winding transformer 5, the other end of the second grounding disconnecting link is connected with the ground, and the neutral point on the high-voltage side of the main transformer 16 is directly connected with the ground; the transformation ratio of the first three-winding transformer 5 is 110kV/6.3kV/6.3kV, the transformation ratio of the second three-winding transformer 12 is 20kV/6.3kV/6.3kV, the rated output voltage of the thermal power generator 15 is 20kV, and the transformation ratio of the main transformer 16 is 525kV/20 kV; the ground resistor 13 is used to ground the neutral point of the thermal power generator.
As shown in fig. 2, when the 110kV system bus 1 runs normally, and the 500kV system 19 is simulated to lose power, the 500kV circuit breaker 17 is withdrawn from the protection cabinet for reclosing, the first 110kV disconnecting link 2, the 100kV circuit breaker 3, the second 110kV disconnecting link 4, the fourth 6kV switch 10, the third 6kV switch 11, the second grounding disconnecting link 20, the first grounding disconnecting link 14, the 500kV circuit breaker 17, and the 500kV disconnecting link 18 are all in a closed state, the thermal power generator 15 is switched to stop by using trip reverse power to disconnect the 500kV circuit breaker 17, the thermal power generator 15 fast switching device disconnects the fourth 6kV switch 10 and the third 6kV switch 11, closes the second 6kV switch 6 and the first 6kV switch 7, and the second winding transformer 12 is switched to the 110kV system bus 1 for power supply; the thermal power generator 15 and the main transformer 16 are in a non-pressure state; by adopting a trip reverse power large brake stopping mode, the thermal power generator 15 can be prevented from overspeed caused by incomplete closing of turbine blades.
As shown in fig. 3, when the thermal power generator 15 is started in black, the thermal power generator 15 is set at a constant speed of 3000r/min, the terminal voltage is 20kV, the third 6kV switch 11 is closed by using a synchronous device, the thermal power generator 15 is connected to the 110kV system bus 1 and manually closed to the fourth 6kV switch 10, the loads of the second 6kV bus 8 and the first 6kV bus 9 are transferred to the thermal power generator 15, the active power of the first three-winding transformer 5 is reduced to zero, the second 6kV switch 6 and the first 6kV switch 7 are disconnected, the thermal power generator 15 realizes the isolated island operation with power from plant, the 500kV circuit breaker 17 is closed, the 500kV system 19 is recovered to be powered by the thermal power generator 15, the excitation voltage 103V of the thermal power generator 15, the active power is 16MW, the reactive power is 15Mvar, the main transformer 16 high-voltage side voltage 530kV, The current was 24A.
As shown in fig. 4, when the 110kV system bus 1 loses power, the 500kV system 19 operates normally, the first 110kV disconnecting link 2, the 100kV circuit breaker 3, the second 110kV disconnecting link 4, the fourth 6kV switch 10, the third 6kV switch 11, the first grounding disconnecting link 14, the 500kV circuit breaker 17, the 500kV disconnecting link 18, and the second grounding disconnecting link 20 are all in a closed state, the second 6kV switch 6 and the first 6kV switch 7 are closed, and the 110kV system bus 1 is restored to be powered by the 500kV system 19. A black start method of a thermal power generating unit of a 500kV system assisted by a 110kV system comprises the following steps:
1) putting the thermal power generator 15 into a security diesel generator, and entering the step 2) when the security diesel generator is in a hot standby state;
2) stopping the thermal power generator 15 by using a trip reverse power method, and proceeding to step 3);
3) opening the 500kV circuit breaker 17, and entering the step 4);
4) the magnetic-extinguishing switch of the thermal power generator 15 is switched off, and the step 5) is carried out;
5) the third 6kV switch 11 is switched off, and the step 6) is carried out;
6) the fourth 6kV switch 10 is switched off, and the step 7) is carried out;
7) switching on the first 6kV switch 7, and entering the step 8);
8) switching on the second 6kV switch 6, and entering the step 9);
9) confirming the non-pressure state of the thermal power generator 15 and the main transformer 16, and entering the step 10);
10) confirming that the 110kV system bus 1 normally operates, and entering step 11);
11) the speed of the thermal power generator 15 is rushed to 3000r/min, and the step 12) is carried out;
12) building a voltage of 20kV at the end of the thermal power generator 15, and entering step 13);
13) closing the third 6kV switch 11 with a contemporaneous device, entering step 14);
14) manually closing the fourth 6kV switch 10, and entering step 15);
15) manually opening the first 6kV switch 7, and entering step 16);
16) manually switching off the second 6kV switch 6, and entering step 17);
17) the thermal generator 15 carries the second three-winding transformer 12) to maintain island operation, and the step 18) is carried out;
18) and closing the 500kV circuit breaker 17, and recovering the thermal power generator 15 to supply power for the 500kV system 19. In this embodiment, the security diesel generator is adjusted to a hot standby state, so as to prevent the second 6kV bus 8 and the first 6kV bus 9 from failing to switch loads, which causes the thermal generator 15 to lose power, and the security diesel generator is used for ensuring the safety of the unit at the first time after the power is lost.
In this embodiment, in step 1), the security diesel generator is started to an idle mode, and is pressurized to a rated voltage of 400V and adjusted to a hot standby state; in the step 2), the thermal power generator 15 is stopped by using a trip reverse power mode, and the protective device of the thermal power generator 15 automatically starts the quick switching device to switch the working power supply and the standby power supply; and 13) adjusting and capturing the time of the same frequency, the same voltage and the same phase of the secondary side signals of the third 6kV switch 11 and the first 6kV switch 7 voltage transformer by the synchronous device, and closing the third 6kV switch 11.
As shown in FIG. 5, the voltage parameter of the thermal power generator 15 of the present invention operates smoothly, the voltage indication is correct, and the voltage is built up to the rated voltage and maintained at 20 kV.
The invention discloses a 110kV system auxiliary 500kV system thermal power generating unit black start system and a method, which mainly comprise a 110kV system bus, a 500kV system and a thermal power generator, wherein the 110kV system bus and the 500kV system are connected through a first three-winding transformer and a second three-winding transformer. The invention relates to a safety diesel generator of a thermal power generator, which is put into a thermal power generator by simulating the power loss of a 500kV system to ensure that the diesel generator is in a hot standby state, the reverse power is jumped in the on-process of a thermal power unit to realize the function of electric trip, the service power is further switched, the safety of auxiliary machines for the service of the thermal power unit is ensured, the thermal power unit provides power by virtue of a 110kV system bus to realize the ignition, the impact, the constant speed and the voltage build-up of the thermal power unit, and the thermal power unit is connected to the 110kV system by a 6kV low-voltage system through the synchronous realization, and then a 110kV system power switch is switched off to realize the stable operation of the service power of the thermal; when the 110kV system loses power, the 500kV system recovers the power supply of the 110kV system through the second three-winding transformer and the first three-winding transformer; the invention provides a novel thermal power black start technology, which realizes black start coordination under the condition of power failure of two power grids, thereby constructing a strong power grid and reducing the influence and loss of the power grid power failure on the whole society.
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 (9)
1. A black start system of a thermal power generating unit of a 110kV system auxiliary 500kV system is characterized by comprising a 110kV system bus (1), a first three-winding transformer (5), a first 6kV bus (9), a second three-winding transformer (12), a thermal power generator (15) and a 500kV system (19);
one end of the 110kV system bus (1) is connected with a 110kV system, the other end of the 110kV system bus is connected with the high-voltage side of the first three-winding transformer (5) through a first 110kV disconnecting link (2), a 100kV circuit breaker (3) and a second 110kV disconnecting link (4) in sequence, the branch A of the low-voltage side of the first three-winding transformer (5) is connected with the first 6kV bus (9) through a first 6kV switch (7), and the branch B of the low-voltage side of the first three-winding transformer (5) is connected with the second 6kV bus (8) through a second 6kV switch (6);
the first 6kV bus (9) is connected with a branch A at the low voltage side of the second three-winding transformer (12) through a third 6kV switch (11), the second 6kV bus (8) is connected with a branch B at the low voltage side of the second three-winding transformer (12) through a fourth 6kV switch (10), and the high voltage side of the second three-winding transformer (12) is connected with the 500kV system (19) through a main transformer (16), a 500kV circuit breaker (17) and a 500kV disconnecting link (18) in sequence;
the output end of the thermal power generator (15) is connected with the high-voltage side of the second three-winding transformer (12).
2. The black start system of the thermal power generating unit with the 110kV system auxiliary 500kV system as claimed in claim 1, further comprising a first grounding switch (14) and a second grounding switch (20);
one end of the first grounding disconnecting link (14) is connected with a neutral point of the thermal power generator (15), and the other end of the first grounding disconnecting link is connected with the ground through a grounding resistor (13);
one end of the second grounding disconnecting link (20) is connected with a neutral point on the high-voltage side of the first three-winding transformer (5), the other end of the second grounding disconnecting link is connected with the ground, and the neutral point on the high-voltage side of the main transformer (16) is directly connected with the ground.
3. The black start system for the thermal power generating unit of the 110kV system auxiliary 500kV system as claimed in claim 2, wherein the 110kV system bus (1) is normally operated, and when the 500kV system (19) is de-energized, the first 110kV disconnecting link (2), the 100kV circuit breaker (3), the second 110kV disconnecting link (4), the fourth 6kV switch (10), the third 6kV switch (11), the second grounding disconnecting link (20), the first grounding disconnecting link (14), the 500kV circuit breaker (17) and the 500kV disconnecting link (18) are all in a closed state; the thermal power generator (15) is shut down, the 500kV circuit breaker (17), the fourth 6kV switch (10) and the third 6kV switch (11) are disconnected, and the second 6kV switch (6) and the first 6kV switch (7) are closed.
4. The thermal power generating unit black-start system of the 110kV system auxiliary 500kV system as claimed in claim 3, wherein when the thermal power generator (15) is in black-start, the thermal power generator (15) is connected to the 110kV system bus (1) in a grid mode, the fourth 6kV switch (10) is closed, the second 6kV switch (6) and the first 6kV switch (7) are disconnected, the thermal power generator (15) is operated in an isolated island mode with service, the 500kV circuit breaker (17) is closed, and the 500kV system (19) is powered by the thermal power generator (15).
5. A black start system for a thermal power generating unit of a 500kV system assisted by a 110kV system according to claim 4, wherein when the 110kV system bus (1) is de-energized, the 500kV system (19) operates normally, the first 110kV disconnecting link (2), the 100kV circuit breaker (3), the second 110kV disconnecting link (4), the fourth 6kV switch (10), the third 6kV switch (11), the first grounding disconnecting link (14), the 500kV circuit breaker (17), the 500kV disconnecting link (18) and the second grounding disconnecting link (20) are all in a closed state, the second 6kV switch (6) and the first 6kV switch (7) are closed, and the 110kV system bus (1) is powered by the 500kV system (19).
6. A black start method for a thermal power generating unit of a 500kV system assisted by a 110kV system is characterized by comprising the following steps:
1) putting the thermal power generator (15) into a security diesel generator, keeping the security diesel generator in a hot standby state, and entering the step 2);
2) stopping the thermal power generator (15) by using a trip reverse power mode, and proceeding to step 3);
3) the 500kV circuit breaker (17) is switched off, and the step 4) is carried out;
4) the magnetic-field-extinguishing switch of the thermal power generator (15) is switched off, and the step 5) is carried out;
5) the third 6kV switch (11) is switched off, and the step 6) is carried out;
6) the fourth 6kV switch (10) is switched off, and the step 7) is carried out;
7) switching on the first 6kV switch (7), and entering a step 8);
8) switching on the second 6kV switch (6), and entering the step 9);
9) confirming the non-pressure states of the thermal power generator (15) and the main transformer (16), and entering the step 10);
10) confirming that the 110kV system bus (1) normally operates, and entering step 11);
11) the speed of the thermal power generator (15) is rushed to 3000r/min, and the step 12) is carried out;
12) building a voltage to 20kV at the machine end of the thermal power generator (15), and entering step 13);
13) closing the third 6kV switch (11) by using a synchronous device, and entering step 14);
14) manually closing the fourth 6kV switch (10), and entering step 15);
15) manually opening the first 6kV switch (7) and entering step 16);
16) manually opening the second 6kV switch (6), and entering step 17);
17) the thermal generator (15) carries out load maintenance on island operation from the transformer (12) with the second third winding, and the step 18 is carried out;
18) and closing the 500kV circuit breaker (17), and recovering the thermal power generator (15) to supply power for the 500kV system (19).
7. The black-start method for the thermal power generating unit of the 110kV system auxiliary 500kV system as claimed in claim 6, wherein in the step 1), the security diesel generator is started to be in an idle mode, is pressurized to a rated voltage of 400V, and is adjusted to be in a hot standby state.
8. The black-start method for the thermal power generating unit of the auxiliary 500kV system of the 110kV system as claimed in claim 6, wherein the thermal power generator (15) is stopped by using a trip reverse power mode in the step 2), and a protection device of the thermal power generator (15) automatically starts a fast switching device to switch between a working power supply and a standby power supply.
9. The black-start method for the thermal power generating unit of the 110kV system auxiliary 500kV system according to claim 6, wherein in the step 13), the synchronization device adjusts and captures the time of the same frequency, the same voltage and the same phase of the secondary side signals of the voltage transformer of the third 6kV switch (11) and the first 6kV switch (7), and closes the third 6kV switch (11).
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