An electrical system and working method for combined black start of 9E and 9F gas turbines

Abstract

The invention discloses an electrical system for the combined black start of 9E and 9F gas turbines and a working method thereof, comprising a 9E gas turbine black start power supply unit, a first 9E gas turbine high-voltage plant transformer, a first 9E gas turbine high-voltage plant power unit, a first 9F gas turbine high-voltage plant power unit, a first 9F gas turbine main wiring unit, a second 9E gas turbine high-voltage plant transformer, a second 9E gas turbine high-voltage plant power unit, a second 9F gas turbine high-voltage plant power unit, a second 9F gas turbine main wiring unit, a 9E gas turbine start-up standby transformer, a 9E gas turbine high-voltage standby section, a 9E gas turbine high-voltage standby section black start power supply incoming line switch, and a 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch. The system and the working method thereof can realize the combined black start of 9E and 9F gas turbines, and can realize the miniaturization of black start diesel generators, thereby solving the problem that the black start power supply of 9F gas turbines is difficult to manufacture and expensive.

Description

Technical Field

[0001] The invention belongs to the field of electrical design and relates to an electrical system for a 9E and 9F gas turbine combined black start and a working method thereof. Background Art

[0002] 9E and 9F gas turbines are located at the load center, with large capacity and fast starting speed, and are the best choice for black start power supply points. The key to a gas turbine becoming a black start power supply point is to configure a reasonable black start power supply, which usually uses a fast-start diesel generator, and also uses energy storage equipment. Due to the presence of the compressor, the self-starting load of the gas turbine is very large, about 2000kW for a 9E gas turbine and about 9000kW for a 9F gas turbine. High-voltage diesel generators and energy storage equipment of this capacity are difficult to manufacture and expensive.

[0003] Design specifications stipulate that generator sets above 200MW need to be equipped with an emergency safety power supply to ensure that important loads will not be shut down when the entire plant loses power, ensuring the safety of equipment in the plant. Quick-start diesel generators are usually selected as emergency safety power supplies.

[0004] Therefore, it is necessary to find an electrical system and starting method for the joint black start of 9E and 9F gas turbines that are both reliable and economical, and the system and method can realize the joint black start of 9E and 9F gas turbines. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an electrical system and a working method for the combined black start of 9E and 9F gas turbines. The system and the working method can realize the combined black start of 9E and 9F gas turbines and can realize the miniaturization of black start diesel generators, thereby solving the problem of difficult and expensive manufacturing of black start power supply for 9F gas turbines.

[0006] To achieve the above-mentioned purpose, the electrical system for the combined black start of 9E and 9F gas turbines of the present invention comprises a 9E gas turbine black start power supply unit, a first 9E gas turbine high-voltage plant transformer, a first 9E gas turbine high-voltage plant power unit, a first 9F gas turbine high-voltage plant power unit, a first 9F gas turbine main wiring unit, a second 9E gas turbine high-voltage plant transformer, a second 9E gas turbine high-voltage plant power unit, a second 9F gas turbine high-voltage plant power unit, a second 9F gas turbine main wiring unit, a 9E gas turbine start-up standby transformer, a 9E gas turbine high-voltage standby section, a 9E gas turbine high-voltage standby section black start power supply incoming line switch, and a 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch;

[0007] The 9E gas turbine black start power supply unit includes a No. 1 diesel generator, a No. 2 diesel generator, a black start diesel generator and a black start 380V section, wherein the No. 1 diesel generator, the No. 2 diesel generator and the black start diesel generator are connected to the black start 380V section, the black start 380V section is connected to the 9E gas turbine high voltage standby section via the black start power supply incoming switch, the first 9F gas turbine main wiring unit is connected to the first 9E gas turbine high voltage plant transformer and the 9E gas turbine high voltage standby section via the first 9F gas turbine high voltage plant power unit and the first 9E gas turbine high voltage plant power unit, the second 9F gas turbine main wiring unit is connected to the 9E gas turbine high voltage standby section and the second 9E gas turbine high voltage plant transformer via the second 9F gas turbine high voltage plant power unit and the second 9E gas turbine high voltage plant power unit, and the first 9F gas turbine high voltage plant power unit is connected to the second 9F gas turbine high voltage plant power unit;

[0008] The 9E gas turbine start-up standby transformer is connected to the 9E gas turbine high-voltage standby section through the 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch.

[0009] The 9E gas turbine black start power supply unit also includes No. 1 diesel generator outlet circuit breaker, No. 1 diesel generator outlet 380V section, the first 9F gas turbine accident safety section diesel generator incoming line switch, the first 9F gas turbine accident safety section, No. 2 diesel generator outlet circuit breaker, No. 2 diesel generator outlet 380V section, the second 9F gas turbine accident safety section diesel generator incoming line switch, the second 9F gas turbine accident safety section, black start diesel generator outlet circuit breaker, black start 380V section first incoming line switch, black start 380V section second incoming line switch, black start transformer low voltage side switch and black start transformer;

[0010] The No. 1 diesel generator is connected to the No. 1 diesel generator outlet 380V section through the No. 1 diesel generator outlet circuit breaker. The No. 1 diesel generator outlet 380V section is connected to the first 9F gas turbine accident safety section through the first 9F gas turbine accident safety section diesel generator incoming line switch. The No. 1 diesel generator outlet 380V section is connected to the black start 380V section through the first incoming line switch of the black start 380V section; the No. 2 diesel generator is connected to the No. 2 diesel generator outlet 380V section through the No. 2 diesel generator outlet circuit breaker. The 380V section at the machine outlet is connected to the second 9F gas turbine accident safety section through the second 9F gas turbine accident safety section diesel generator incoming line switch, and the No. 2 diesel generator outlet 380V section is connected to the black start 380V section through the second incoming line switch of the black start 380V section; the black start diesel generator is connected to the black start 380V section through the black start diesel generator outlet circuit breaker; the black start 380V section is connected to the 9E gas turbine high-voltage standby section through the black start transformer low-voltage side switch, the black start transformer and the 9E gas turbine high-voltage standby section black start power incoming line switch.

[0011] The first 9E gas turbine high-voltage auxiliary power unit includes a first 9E gas turbine high-voltage auxiliary power bus, a first 9E gas turbine high-voltage auxiliary power bus working power supply incoming line switch and a first 9E gas turbine high-voltage auxiliary power bus standby power supply incoming line switch;

[0012] The second 9E gas turbine high-voltage auxiliary power unit includes the second 9E gas turbine high-voltage auxiliary power bus, the second 9E gas turbine high-voltage auxiliary power bus working power supply incoming line switch and the second 9E gas turbine high-voltage auxiliary power supply incoming line switch;

[0013] The first 9E gas turbine high-voltage plant transformer is connected to the first 9E gas turbine high-voltage plant bus through the first 9E gas turbine high-voltage plant bus working power supply incoming line switch; the 9E gas turbine high-voltage standby section is connected to the first 9E gas turbine high-voltage plant bus through the first 9E gas turbine high-voltage plant bus standby power supply incoming line switch; the second 9E gas turbine high-voltage plant transformer is connected to the second 9E gas turbine high-voltage plant bus through the second 9E gas turbine high-voltage plant bus working power supply incoming line switch; the 9E gas turbine high-voltage standby section is connected to the second 9E gas turbine high-voltage plant bus through the second 9E gas turbine high-voltage plant bus standby power supply incoming line switch;

[0014] The first 9F gas turbine high-voltage plant power unit is connected to the first 9E gas turbine high-voltage plant bus, and the second 9F gas turbine high-voltage plant power unit is connected to the second 9E gas turbine high-voltage plant bus.

[0015] The first 9F gas turbine high-voltage auxiliary power unit includes a first 9F gas turbine high-voltage auxiliary power bus, a first 9F gas turbine high-voltage auxiliary power bus working power supply incoming line switch, a first 9F gas turbine high-voltage auxiliary power bus standby power supply incoming line switch and an interconnection switch 1;

[0016] The second 9F gas turbine high-voltage auxiliary power unit includes the second 9F gas turbine high-voltage auxiliary power bus, the second 9F gas turbine high-voltage auxiliary power bus working power supply incoming line switch, the second 9F gas turbine high-voltage auxiliary power bus standby power supply incoming line switch and the second interconnection switch;

[0017] The first 9F gas turbine main connection unit is connected to the first 9F gas turbine high-voltage plant busbar through the first 9F gas turbine high-voltage plant busbar working power supply incoming line switch; the first 9E gas turbine high-voltage plant power unit is connected to the first 9F gas turbine high-voltage plant busbar through the interconnection switch 1;

[0018] The second 9F gas turbine main connection unit is connected to the second 9F gas turbine high-voltage plant busbar through the second 9F gas turbine high-voltage plant busbar working power supply incoming line switch; the second 9E gas turbine high-voltage plant power unit is connected to the second 9F gas turbine high-voltage plant busbar through the interconnection switch 2;

[0019] The second 9F gas turbine high-voltage plant bus is connected to the first 9F gas turbine high-voltage plant bus through the second 9F gas turbine high-voltage plant bus backup power supply incoming line switch and the first 9F gas turbine high-voltage plant bus backup power supply incoming line switch.

[0020] The first 9F gas turbine main connection unit includes a first 9F gas turbine generator, a first 9F gas turbine outlet circuit breaker, a first 9F gas turbine main transformer, a first 9F gas turbine main transformer high-voltage side circuit breaker, a first 9F gas turbine high-voltage bus and a first 9F gas turbine high-voltage plant transformer;

[0021] The second 9F gas turbine main connection unit includes a second 9F gas turbine generator, a second 9F gas turbine outlet circuit breaker, a second 9F gas turbine main transformer, a second 9F gas turbine main transformer high-voltage side circuit breaker, a second 9F gas turbine high-voltage busbar and a second 9F gas turbine high-voltage plant transformer;

[0022] The first 9F gas turbine generator is connected to the low-voltage side of the first 9F gas turbine main transformer through the first 9F gas turbine outlet circuit breaker, the first 9F gas turbine high-voltage bus is connected to the high-voltage side of the first 9F gas turbine main transformer through the first 9F gas turbine main transformer high-voltage side circuit breaker, and the low-voltage side of the first 9F gas turbine main transformer is connected to the first 9F gas turbine high-voltage plant power unit through the first 9F gas turbine high-voltage plant transformer;

[0023] The second 9F gas turbine generator is connected to the low-voltage side of the second 9F gas turbine main transformer via the second 9F gas turbine outlet circuit breaker, the second 9F gas turbine high-voltage bus is connected to the high-voltage side of the second 9F gas turbine main transformer via the high-voltage side circuit breaker of the second 9F gas turbine main transformer, and the low-voltage side of the second 9F gas turbine main transformer is connected to the second 9F gas turbine high-voltage plant power unit via the second 9F gas turbine high-voltage plant transformer.

[0024] A working method of an electrical system for a combined black start of a 9E and 9F gas turbine comprises the following steps:

[0025] 1) Black start diesel generator, No. 1 diesel generator and No. 2 diesel generator are ready;

[0026] 2) Black start diesel generator start;

[0027] 3) No. 1 diesel generator and No. 2 diesel generator are started, and the 9E gas turbine black start power supply unit is ready;

[0028] 4) Black start of 9E gas turbine;

[0029] 5) Black start of the first 9F gas turbine;

[0030] 6) Black start of the second 9F engine;

[0031] 7) No. 1 diesel generator and No. 2 diesel generator are restored to hot standby status.

[0032] The specific operations of step 1) are:

[0033] 11) Put the black start diesel generator into hot standby mode;

[0034] 12) Put diesel generator No. 1 into hot standby mode;

[0035] 13) Put diesel generator No. 2 into hot standby mode.

[0036] The specific operations of step 2) are:

[0037] 21) The power grid collapsed, the entire 9E unit lost power, the 9E gas turbine start-up transformer, the first 9E gas turbine high-voltage plant bus, the second 9E gas turbine high-voltage plant bus, the first 9E gas turbine high-voltage plant transformer and the second 9E gas turbine high-voltage plant transformer were all in a power-off state, and the black start diesel generator received the black start command of the 9E unit;

[0038] 22) The black start diesel generator starts after receiving the black start command from the 9E unit. The speed of the black start diesel generator increases to the rated speed, and the black start diesel generator is excited. After the black start diesel generator successfully builds up pressure, the black start diesel generator outlet circuit breaker is closed, and the black start 380V section is energized;

[0039] 23) Close the low-voltage side switch of the black start transformer, and the black start transformer becomes energized; close the black start power supply line switch of the high-voltage standby section of the 9E gas turbine, and the power supply of the high-voltage standby section of the 9E gas turbine is restored;

[0040] 24) After the No. 1 diesel generator and the No. 2 diesel generator are connected to the black start 380V section, the 9E gas turbine black start power supply is ready.

[0041] The specific operations of step 3) are:

[0042] 31) 9F gas turbine lost power to the entire plant;

[0043] 32) After checking that the first 9F engine accident safety section and the second 9F engine accident safety section lost power, the No. 1 diesel generator and the No. 2 diesel generator started automatically. When the No. 1 diesel generator and the No. 2 diesel generator reached the rated speed, the excitation was automatically put into operation, the No. 1 diesel generator and the No. 2 diesel generator built up pressure successfully, the No. 1 diesel generator outlet circuit breaker and the No. 2 diesel generator outlet circuit breaker were closed, and the black start 380V section was energized;

[0044] 33) The diesel generator incoming line switch of the first 9F gas turbine accident safety section and the diesel generator incoming line switch of the second 9F gas turbine accident safety section are closed, and the power supply of the first 9F gas turbine accident safety section and the second 9F gas turbine accident safety section is restored;

[0045] 34) The loads on the first 9F gas turbine accident safety section and the second 9F gas turbine accident safety section resume power supply;

[0046] 35) The 380V section at the outlet of No. 1 diesel generator is connected to the grid through the first incoming line switch of the black start 380V section; the 380V section at the outlet of No. 2 diesel generator is connected to the grid through the second incoming line switch of the black start 380V section.

[0047] 10. The electrical system and starting method for the combined black start of 9E and 9F gas turbines according to claim 6, characterized in that the specific operation of step 4) is:

[0048] 41) Close the first 9E gas turbine high-voltage plant bus standby power supply incoming switch, and provide black start power to the first 9E gas turbine high-voltage plant bus through the 9E gas turbine high-voltage standby section; the first 9E gas turbine is started using the black start power provided by the 9E gas turbine high-voltage standby section. After the first 9E gas turbine completes speed increase and purge, the first 9E gas turbine is set at a constant speed of 3000 rpm, the first 9E gas turbine generator voltage is built up to the rated voltage, and the first 9E gas turbine high-voltage plant transformer resumes power supply;

[0049] 42) The first 9E gas turbine high-voltage plant bus standby power supply line switch is opened, and the first 9E gas turbine high-voltage plant bus working power supply line switch is closed, and the first 9E gas turbine high-voltage plant bus is restored to power supply from the first 9E gas turbine high-voltage plant transformer;

[0050] 43) Disconnect the black start power supply line switch of the high-voltage standby section of the 9E gas turbine and the low-voltage side switch of the black start transformer, and the black start transformer will be powered off;

[0051] 44) Disconnect the first incoming line switch of the black start 380V section, disconnect the second incoming line switch of the black start 380V section, disconnect the black start diesel generator outlet circuit breaker, and the black start 380V section is powered off; manually shut down the black start diesel generator, and restore the black start diesel generator to hot standby status after the shutdown is successful;

[0052] Step 5) The specific operation process is:

[0053] 51) Close the interconnection switch 1, and the high-voltage plant busbar of the first 9E gas turbine provides black start power to the first 9F gas turbine through the interconnection switch 1;

[0054] 52) The first 9F gas turbine is started using the black start power provided by the first 9E gas turbine high-voltage plant busbar. After the first 9F gas turbine completes speed increase and purge, the first 9F gas turbine unit is set at a constant speed of 3000 rpm, the first 9F gas turbine generator is built up to the rated voltage, the first 9F gas turbine generator outlet circuit breaker is closed, and the first 9F gas turbine high-voltage plant transformer resumes power supply;

[0055] 53) Disconnect the first 9F gas turbine high-voltage plant bus interconnection switch 1, close the first 9F gas turbine high-voltage plant bus working power supply line switch, and the first 9F gas turbine high-voltage plant bus resumes power supply from the first 9F gas turbine high-voltage plant transformer;

[0056] 54) Manually shut down the No. 1 diesel generator, and restore the No. 1 diesel generator to hot standby status after the shutdown is successful;

[0057] The specific operations of step 6) are:

[0058] 61) Close the first 9F gas turbine high-voltage plant bus standby power supply incoming line switch and the second 9F gas turbine high-voltage plant bus standby power supply incoming line switch. The first 9F gas turbine high-voltage plant bus provides black start power to the second 9F gas turbine high-voltage plant bus;

[0059] 62) The second 9F gas turbine is started using the black start power provided by the first 9F gas turbine high-voltage plant busbar. After the second 9F gas turbine completes speed increase and purging, the second 9F gas turbine unit is set at a constant speed of 3000 rpm, the second 9F gas turbine generator voltage is built up to the rated voltage, the second 9F gas turbine generator outlet circuit breaker is closed, and the second 9F gas turbine high-voltage plant transformer resumes power supply;

[0060] 63) Disconnect the backup power supply line switch of the second 9F gas turbine high-voltage plant busbar, close the working power supply line switch of the second 9F gas turbine high-voltage plant busbar, and the second 9F gas turbine high-voltage plant busbar resumes power supply from the second 9F gas turbine high-voltage plant transformer;

[0061] 64) Manually shut down the No. 2 diesel generator and restore the No. 2 diesel generator to hot standby status after successful shutdown.

[0062] The present invention has the following beneficial effects:

[0063] In the specific operation of the electrical system and working method for the combined black start of 9E and 9F gas turbines described in the present invention, No. 1 diesel generator set, No. 2 diesel generator set and the black start diesel generator are connected in parallel to form the black start power supply of the 9E gas turbine, so as to realize the miniaturization of the black start diesel generator and reduce the manufacturing difficulty and cost; at the same time, the black start of the 9E unit successfully provides the black start power supply for the 9F unit, solving the problem that the black start power supply of the 9F gas turbine is difficult to realize; the No. 1 diesel generator and the No. 2 diesel generator serve as both the accident safety power supply of the 9F gas turbine and the black start power supply, thereby improving the utilization rate of the diesel generator, solving the problem that the black start power supply of the 9F gas turbine is difficult to manufacture and expensive, realizing the combined black start of the 9E and 9F gas turbines, and can be widely used in the design of electrical systems for large gas turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a structural schematic diagram of the present invention;

[0065] Figure 2 It is a flow chart of the present invention.

[0066] Among them, 1 is the black start power supply unit, 2 is the first 9E gas turbine high-voltage plant transformer, 3 is the first 9E gas turbine high-voltage plant power unit, 4 is the first 9F gas turbine high-voltage plant power unit, 5 is the first 9F gas turbine main connection unit, 6 is the second 9E gas turbine high-voltage plant transformer, 7 is the second 9E gas turbine high-voltage plant power unit black start 380V bus, 8 is the second 9F gas turbine high-voltage plant power unit, 9 is the second 9F gas turbine main connection unit, 10 is the 9E gas turbine start-up standby transformer, 11 is the 9E gas turbine high-voltage standby section, 12 is the 9E gas turbine high-voltage standby section black start power supply incoming line switch, 13 is the 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch, 14 is No. 1 diesel generator, 15 is No. 1 diesel generator output 16 is the No. 1 diesel generator outlet 380V section, 17 is the first 9F gas turbine accident safety section diesel generator incoming line switch, 18 is the first 9F gas turbine accident safety section, 19 is the No. 2 diesel generator, 20 is the No. 2 diesel generator outlet circuit breaker, 21 is the No. 2 diesel generator outlet 380V section, 22 is the second 9F gas turbine accident safety section diesel generator incoming line switch, 23 is the second 9F gas turbine accident safety section, 24 is the black start diesel generator, 25 is the black start diesel generator outlet circuit breaker, 26 is the black start 380V section first incoming line switch, 27 is the black start 380V section second incoming line switch, 28 is the black start 380V section, 29 is the black start transformer low voltage side switch , 30 is the black start transformer, 31 is the first 9E gas turbine high-voltage plant bus, 32 is the first 9E gas turbine high-voltage plant bus working power supply line switch, 33 is the first 9E gas turbine high-voltage plant bus standby power supply line switch, 34 is the first 9F gas turbine high-voltage plant bus, 35 is the first 9F gas turbine high-voltage plant bus working power supply line switch, 36 is the interconnection switch 1, 37 is the first 9F gas turbine high-voltage plant bus standby power supply line switch, 38 is the first 9F gas turbine high-voltage plant transformer, 39 is the first 9F gas turbine main transformer, 40 is the first 9F gas turbine main transformer high-voltage side circuit breaker, 41 is the first 9F gas turbine high-voltage bus, 42 is the first 9F gas turbine generator, 43 is the first 9F gas turbine output The outlet circuit breaker, 44 is the second 9E gas turbine high-voltage plant bus, 45 is the second 9E gas turbine high-voltage plant bus working power supply line switch, 46 is the second 9E gas turbine high-voltage plant bus standby power supply line switch, 47 is the second 9F gas turbine high-voltage plant bus, 48 ​​is the second 9F gas turbine high-voltage plant bus working power supply line switch, 49 is the interconnection switch 2, 50 is the second 9F gas turbine high-voltage plant bus standby power supply line switch, 51 is the second 9F gas turbine high-voltage plant transformer, 52 is the second 9F gas turbine main transformer, 53 is the second 9F gas turbine main transformer high-voltage side circuit breaker, 54 is the second 9F gas turbine high-voltage bus, 55 is the second 9F gas turbine generator, and 56 is the second 9F gas turbine outlet circuit breaker. DETAILED DESCRIPTION

[0067] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0068] refer to Figure 1 The electrical system for the combined black start of 9E and 9F gas turbines of the present invention comprises a 9E gas turbine black start power supply unit 1, a first 9E gas turbine high-voltage plant transformer 2, a first 9E gas turbine high-voltage plant power unit 3, a first 9F gas turbine high-voltage plant power unit 4, a first 9F gas turbine main connection unit 5, a second 9E gas turbine high-voltage plant transformer 6, a second 9E gas turbine high-voltage plant power unit 7, a second 9F gas turbine high-voltage plant power unit 8, a second 9F gas turbine main connection unit 9, a 9E gas turbine start-up standby transformer 10, a 9E gas turbine high-voltage standby section 11, a 9E gas turbine high-voltage standby section black start power supply incoming line switch 12, and a 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch 13. Among them, No. 1 diesel generator 14, No. 2 diesel generator 19 and black start diesel generator 24 are connected in parallel to provide black start power for the 9E gas turbine; the high-voltage plant power of the first 9F gas turbine and the second 9F gas turbine adopts hand-in-hand wiring method and serves as backup power for each other; the high-voltage plant bus of the first 9E gas turbine provides black start power for the first 9F gas turbine through interconnection switch 1 36; the high-voltage plant bus of the second 9E gas turbine provides black start power for the second 9F gas turbine through interconnection switch 2 49.

[0069] The 9E gas turbine black start power supply unit 1 comprises a No. 1 diesel generator 14, a No. 1 diesel generator outlet circuit breaker 15, a No. 1 diesel generator outlet 380V section 16, a first 9F gas turbine accident safety section diesel generator incoming line switch 17, a first 9F gas turbine accident safety section 18, a No. 2 diesel generator 19, a No. 2 diesel generator outlet circuit breaker 20, a No. 2 diesel generator outlet 380V section 21, a second 9F gas turbine accident safety section diesel generator incoming line switch 22, a second 9F gas turbine accident safety section 23. , black start diesel generator 24, black start diesel generator outlet circuit breaker 25, black start 380V section first incoming line switch 26, black start 380V section second incoming line switch 27, black start 380V section 28, black start transformer low voltage side switch 29, black start transformer 30, wherein No. 1 diesel generator 14 supplies power to No. 1 diesel generator outlet 380V section 16 through No. 1 diesel generator outlet circuit breaker 15, No. 1 diesel generator outlet 380V section 16 is connected to the first 9F gas turbine event circuit breaker 15. Therefore, the diesel generator incoming line switch 17 of the security section supplies power to the first 9F gas turbine accident security section 18, and the No. 1 diesel generator outlet 380V section 16 supplies power to the black start 380V section 28 through the black start 380V section first incoming line switch 26; the No. 2 diesel generator 19 supplies power to the No. 2 diesel generator outlet 380V section 21 through the No. 2 diesel generator outlet circuit breaker 20, and the No. 2 diesel generator outlet 380V section 21 supplies power to the second 9F gas turbine accident security section diesel generator incoming line switch 22 for the second 9F gas turbine accident Therefore, the security section 23 is powered, and the No. 2 diesel generator outlet 380V section 21 supplies power to the black start 380V section 28 through the black start 380V section second incoming switch 27; the black start diesel generator 24 supplies power to the black start 380V section 28 through the black start diesel generator outlet circuit breaker 25; the black start 380V section 28 is connected to the black start transformer 30 through the black start transformer low voltage side switch 29, and the black start transformer high voltage side supplies power to the 9E gas turbine high voltage standby section 11 through the high voltage standby section black start power incoming switch 12.

[0070] The first 9E gas turbine high-voltage plant power unit 3 includes a first 9E gas turbine high-voltage plant bus 31, a first 9E gas turbine high-voltage plant bus working power supply incoming line switch 32 and a first 9E gas turbine high-voltage plant bus standby power supply incoming line switch 33, wherein the first 9E gas turbine high-voltage plant transformer 2 provides working power to the first 9E gas turbine high-voltage plant bus 31 through the first 9E gas turbine high-voltage plant bus working power supply incoming line switch 32; the 9E gas turbine high-voltage standby section 11 provides standby power to the first 9E gas turbine high-voltage plant bus 31 through the first 9E gas turbine high-voltage plant bus standby power supply incoming line switch 33.

[0071] The second 9E gas turbine high-voltage plant power unit 7 comprises a second 9E gas turbine high-voltage plant bus 44, a second 9E gas turbine high-voltage plant bus working power supply incoming line switch 45 and a second 9E gas turbine high-voltage plant bus standby power supply incoming line switch 46, wherein the second 9E gas turbine high-voltage plant transformer 6 provides working power to the second 9E gas turbine high-voltage plant bus 44 through the second 9E gas turbine high-voltage plant bus working power supply incoming line switch 45; the 9E gas turbine high-voltage standby section 11 provides standby power to the second 9E gas turbine high-voltage plant bus 44 through the second 9E gas turbine high-voltage plant bus standby power supply incoming line switch 46.

[0072] The first 9F gas turbine high-voltage plant power unit 4 includes a first 9F gas turbine high-voltage plant bus 34, a first 9F gas turbine high-voltage plant bus working power supply incoming line switch 35, a first 9F gas turbine high-voltage plant bus standby power supply incoming line switch 37 and an interconnection switch 1 36. The first 9F gas turbine high-voltage plant transformer 38 provides working power to the first 9F gas turbine high-voltage plant bus 34 through the first 9F gas turbine high-voltage plant bus working power supply incoming line switch 35; the second 9F gas turbine high-voltage plant bus 47 provides standby power to the first 9F gas turbine high-voltage plant bus 34 through the first 9F gas turbine high-voltage plant bus standby power supply incoming line switch 37; the first 9E gas turbine high-voltage plant bus 31 provides black start power to the first 9F gas turbine high-voltage plant bus 34 through the interconnection switch 1 36.

[0073] The second 9F gas turbine high-voltage plant power unit 8 includes a second 9F gas turbine high-voltage plant bus 47, a second 9F gas turbine high-voltage plant bus working power supply incoming line switch 48, a second 9F gas turbine high-voltage plant bus standby power supply incoming line switch 50 and an interconnection switch 2 49. The second 9F gas turbine high-voltage plant transformer 51 provides working power to the second 9F gas turbine high-voltage plant bus 47 through the second 9F gas turbine high-voltage plant bus working power supply incoming line switch 48; the first 9F gas turbine high-voltage plant bus 34 provides standby power to the second 9F gas turbine high-voltage plant bus 47 through the second 9F gas turbine high-voltage plant bus standby power supply incoming line switch 50; the second 9E gas turbine high-voltage plant bus 44 provides black start power to the second 9F gas turbine high-voltage plant bus 47 through the interconnection switch 2 49.

[0074] The first 9F gas turbine main connection unit 5 includes a first 9F gas turbine generator 42, a first 9F gas turbine outlet circuit breaker 43, a first 9F gas turbine main transformer 39, a first 9F gas turbine main transformer high-voltage side circuit breaker 40, a first 9F gas turbine high-voltage bus 41 and a first 9F gas turbine high-voltage plant transformer 38. The first 9F gas turbine generator 42, the first 9F gas turbine outlet circuit breaker 43, the first 9F gas turbine main transformer 39, the first 9F gas turbine main transformer high-voltage side circuit breaker 40 and the first 9F gas turbine high-voltage bus 41 are connected in sequence, and the first 9F gas turbine high-voltage plant transformer 38 is connected to the low-voltage side of the first 9F gas turbine main transformer 39 in a T manner.

[0075] The second 9F gas turbine main connection unit 9 includes a second 9F gas turbine generator 55, a second 9F gas turbine outlet circuit breaker 56, a second 9F gas turbine main transformer 52, a second 9F gas turbine main transformer high-voltage side circuit breaker 53, a second 9F gas turbine high-voltage bus 54 and a second 9F gas turbine high-voltage plant transformer 51. The second 9F gas turbine generator 55, the second 9F gas turbine outlet circuit breaker 56, the second 9F gas turbine main transformer 52, the second 9F gas turbine main transformer high-voltage side circuit breaker 53 and the second 9F gas turbine high-voltage bus 54 are connected in sequence, and the second 9F gas turbine high-voltage plant transformer 51 is connected to the low-voltage side of the second 9F gas turbine main transformer 52 in a T manner.

[0076] refer to Figure 2 The working method of the electrical system of the 9E and 9F gas turbine combined black start of the present invention comprises the following steps:

[0077] 1) Black start diesel generator 24, No. 1 diesel generator 14 and No. 2 diesel generator 19 are ready;

[0078] 2) Black start diesel generator 24 starts;

[0079] 3) No. 1 diesel generator 14 and No. 2 diesel generator 19 are started, and the 9E gas turbine black start power supply unit 1 is ready;

[0080] 4) Black start of 9E gas turbine;

[0081] 5) Black start of the first 9F gas turbine;

[0082] 6) Black start of the second 9F engine;

[0083] 7) No. 1 diesel generator 14 and No. 2 diesel generator 19 are restored to hot standby status.

[0084] The specific operations of step 1) are:

[0085] 11) The black start diesel generator 24 is in hot standby state, that is, the diesel generator has sufficient diesel, the battery is in good condition, the lubricating oil pressure is normal, and the electronic equipment is in good condition;

[0086] 12) Put the No. 1 diesel generator 14 in hot standby mode, that is, the diesel generator has sufficient diesel, the battery is in good condition, the lubricating oil pressure is normal, and the electronic equipment is in good condition;

[0087] 13) Put the No. 2 diesel generator 19 in hot standby mode, that is, the diesel generator has sufficient diesel, the battery is in good condition, the lubricating oil pressure is normal and the electronic equipment is in good condition.

[0088] The specific operations of step 2) are:

[0089] 21) The power grid collapses, the entire 9E unit loses power, the 9E gas turbine standby transformer 10, the first 9E gas turbine high-voltage plant bus 31, the second 9E gas turbine high-voltage plant bus 44, the first 9E gas turbine high-voltage plant transformer 2 and the second 9E gas turbine high-voltage plant transformer 6 are all in a power-off state, and the black start diesel generator 24 receives the black start command of the 9E unit;

[0090] 22) The black start diesel generator 24 starts after receiving the black start command of the 9E unit, the speed of the black start diesel generator 24 increases to the rated speed, the black start diesel generator 24 is excited, and after the black start diesel generator 24 successfully builds up the voltage, the black start diesel generator outlet circuit breaker 25 is closed, and the black start 380V section 28 is energized;

[0091] 23) Close the low-voltage side switch 29 of the black start transformer, and the black start transformer 30 is energized; close the black start power supply incoming line switch 12 of the high-voltage standby section of the 9E gas turbine, and the high-voltage standby section 11 of the 9E gas turbine resumes power supply;

[0092] 24) After No. 1 diesel generator 14 and No. 2 diesel generator 19 are connected to the black start 380V section 28, the 9E gas turbine black start power supply is ready.

[0093] The specific operations of step 3) are:

[0094] 31) The entire 9F gas turbine plant loses power, that is, the high-voltage plant busbars of the two 9F gas turbines, the 9F gas turbine main transformer, the 9F gas turbine high-voltage plant transformer and the 9F gas turbine high-voltage plant busbar all lose power;

[0095] 32) After checking that the first 9F engine accident safety section 18 and the second 9F engine accident safety section 23 lose power, the No. 1 diesel generator 14 and the No. 2 diesel generator 19 automatically start. When the No. 1 diesel generator 14 and the No. 2 diesel generator 19 reach the rated speed, the excitation is automatically put into operation, the No. 1 diesel generator 14 and the No. 2 diesel generator 19 successfully build up pressure, the No. 1 diesel generator outlet circuit breaker 15 and the No. 2 diesel generator outlet circuit breaker 20 are closed, and the black start 380V section 28 is energized;

[0096] 33) The diesel generator incoming line switch 17 of the first 9F gas turbine accident safety section and the diesel generator incoming line switch 22 of the second 9F gas turbine accident safety section are closed, and the power supply of the first 9F gas turbine accident safety section 18 and the second 9F gas turbine accident safety section 23 is restored;

[0097] 34) The loads on the first 9F engine accident safety section 18 and the second 9F engine accident safety section 23 resume power supply;

[0098] 35) The outlet 380V section 16 of the No. 1 diesel generator is connected to the grid via the first incoming line switch 26 of the black start 380V section and the black start 380V section 28; the outlet 380V section 21 of the No. 2 diesel generator is connected to the grid via the second incoming line switch 27 of the black start 380V section and the black start 380V section 28.

[0099] The specific operations of step 4) are:

[0100] 41) Close the first 9E gas turbine high-voltage plant bus standby power supply incoming switch 33, and provide the first 9E gas turbine high-voltage plant bus 31 with black start power through the 9E gas turbine high-voltage standby section 11; the first 9E gas turbine is started using the black start power provided by the 9E gas turbine high-voltage standby section 11. After the first 9E gas turbine completes speed increase and purging, the first 9E gas turbine is set at a constant speed of 3000 rpm, the first 9E gas turbine generator voltage is built up to the rated voltage, and the first 9E gas turbine high-voltage plant transformer 2 resumes power supply;

[0101] 42) The first 9E gas turbine high-voltage plant bus standby power supply line switch 33 is opened, and the first 9E gas turbine high-voltage plant bus working power supply line switch 32 is closed, and the first 9E gas turbine high-voltage plant bus 31 is restored to be powered by the first 9E gas turbine high-voltage plant transformer 2;

[0102] 43) Disconnect the black start power supply line switch 12 of the high-voltage standby section of the 9E gas turbine and the black start transformer low-voltage side switch 29, and the black start transformer 30 is powered off;

[0103] 44) Disconnect the first incoming line switch 26 of the black start 380V section, disconnect the second incoming line switch 27 of the black start 380V section, disconnect the black start diesel generator outlet circuit breaker 25, and cut off the power supply of the black start 380V section 28; manually shut down the black start diesel generator 24, and restore the black start diesel generator 24 to a hot standby state after the shutdown is successful;

[0104] Step 5) The specific operation process is:

[0105] 51) Close the interconnection switch 1 36, and the high-voltage auxiliary bus 31 of the first 9E gas turbine provides black start power to the first 9F gas turbine through the interconnection switch 1 36;

[0106] 52) The first 9F gas turbine is started using the black start power provided by the first 9E gas turbine high-voltage plant bus 31. After the first 9F gas turbine completes speed increase and purging, the first 9F gas turbine unit is set at a constant speed of 3000 rpm, the first 9F gas turbine generator 42 is built up to the rated voltage, the first 9F gas turbine generator outlet circuit breaker 43 is closed, and the first 9F gas turbine high-voltage plant transformer 38 resumes power supply;

[0107] 53) Disconnect the first 9F gas turbine high-voltage plant bus interconnection switch 36, close the first 9F gas turbine high-voltage plant bus working power supply line switch 35, and the first 9F gas turbine high-voltage plant bus 34 resumes power supply from the first 9F gas turbine high-voltage plant transformer 38;

[0108] 54) Manually shut down the No. 1 diesel generator 14, and restore the No. 1 diesel generator 14 to hot standby status after the shutdown is successful;

[0109] The specific operations of step 6) are:

[0110] 61) Close the first 9F gas turbine high-voltage plant bus standby power supply incoming line switch 37 and the second 9F gas turbine high-voltage plant bus standby power supply incoming line switch 50, and the first 9F gas turbine high-voltage plant bus 34 provides black start power to the second 9F gas turbine high-voltage plant bus 47;

[0111] 62) The second 9F gas turbine is started by using the black start power provided by the first 9F gas turbine high-voltage plant bus 34. After the second 9F gas turbine completes speed increase and purging, the unit of the second 9F gas turbine is set at a constant speed of 3000 rpm, the second 9F gas turbine generator 55 is built up to the rated voltage, the second 9F gas turbine generator outlet circuit breaker 56 is closed, and the second 9F gas turbine high-voltage plant transformer 51 resumes power supply;

[0112] 63) The second 9F gas turbine high-voltage plant busbar backup power supply inlet switch 50 is turned off, and the second 9F gas turbine high-voltage plant busbar working power supply inlet switch 48 is closed, and the second 9F gas turbine high-voltage plant busbar 47 resumes power supply from the second 9F gas turbine high-voltage plant transformer 51;

[0113] 64) Manually shut down the No. 2 diesel generator 19, and restore the No. 2 diesel generator 19 to hot standby status after successful shutdown.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrical system for the combined black start of 9E and 9F gas turbines, characterized in that: It comprises a 9E gas turbine black start power supply unit (1), a first 9E gas turbine high-voltage power plant transformer (2), a first 9E gas turbine high-voltage power plant unit (3), a first 9F gas turbine high-voltage power plant unit (4), a first 9F gas turbine main connection unit (5), a second 9E gas turbine high-voltage power plant transformer (6), a second 9E gas turbine high-voltage power plant unit (7), a second 9F gas turbine high-voltage power plant unit (8), a second 9F gas turbine main connection unit (9), a 9E gas turbine start-up standby transformer (10), a 9E gas turbine high-voltage standby section (11), a 9E gas turbine high-voltage standby section black start power supply incoming line switch (12) and a 9E gas turbine high-voltage standby section start-up standby transformer power supply incoming line switch (13); The 9E gas turbine black start power supply unit (1) comprises a No. 1 diesel generator (14), a No. 2 diesel generator (19), a black start diesel generator (24) and a black start 380V section (28); The No. 1 diesel generator (14), the No. 2 diesel generator (19) and the black start diesel generator (24) are connected to the black start 380V section (28), the black start 380V section (28) is connected to the 9E gas turbine high voltage standby section black start power supply line switch (12), the first 9F gas turbine main connection unit (5) is connected to the first 9F gas turbine high voltage plant power unit (4) and the first 9E gas turbine high voltage plant power unit (5). The element (3) is connected to the first 9E gas turbine high-voltage power plant transformer (2) and the 9E gas turbine high-voltage standby section (11), the second 9F gas turbine main connection unit (9) is connected to the 9E gas turbine high-voltage standby section (11) and the second 9E gas turbine high-voltage power plant transformer (6) via the second 9F gas turbine high-voltage power plant unit (8) and the second 9E gas turbine high-voltage power plant unit (7), and the first 9F gas turbine high-voltage power plant unit (4) is connected to the second 9F gas turbine high-voltage power plant unit (8); The 9E gas turbine start-up standby transformer (10) is connected to the 9E gas turbine high-voltage standby section (11) via the 9E gas turbine high-voltage standby section start-up standby transformer power supply line switch (13).

2. The electrical system for the combined black start of 9E and 9F gas turbines according to claim 1 is characterized in that: The 9E gas turbine black start power supply unit (1) further comprises a No. 1 diesel generator outlet circuit breaker (15), a No. 1 diesel generator outlet 380V section (16), a first 9F gas turbine accident safety section diesel generator incoming line switch (17), a first 9F gas turbine accident safety section (18), a No. 2 diesel generator outlet circuit breaker (20), a No. 2 diesel generator outlet 380V section (21), a second 9F gas turbine accident safety section diesel generator incoming line switch (22), a second 9F gas turbine accident safety section (23), a black start diesel generator outlet circuit breaker (25), a black start 380V section first incoming line switch (26), a black start 380V section second incoming line switch (27), a black start transformer low voltage side switch (29) and a black start transformer (30); The No. 1 diesel generator (14) is connected to the No. 1 diesel generator outlet 380V section (16) through the No. 1 diesel generator outlet circuit breaker (15), the No. 1 diesel generator outlet 380V section (16) is connected to the first 9F engine accident safety section (18) through the first 9F engine accident safety section diesel generator incoming line switch (17), the No. 1 diesel generator outlet 380V section (16) is connected to the black start 380V section (28) through the black start 380V section first incoming line switch (26); the No. 2 diesel generator (19) is connected to the No. 2 diesel generator outlet 380V section (21) through the No. 2 diesel generator outlet circuit breaker (20), the No. 2 diesel generator outlet 380V section (21) is connected to the No. 2 diesel generator outlet 380V section (22) through the No. 2 diesel generator outlet circuit breaker (20), the No. 2 diesel generator outlet 380V section (16) is connected to the No. 1 diesel generator outlet 380V section (18) through the No. 1 diesel generator outlet circuit breaker (20), the No. 2 diesel generator outlet 380V section (16) is connected to the No. 1 diesel generator outlet 380V section (2 ...18) through the No. 1 diesel generator outlet circuit breaker (20), the No. 2 diesel generator outlet 380V section (16) is connected to the No. 1 diesel generator outlet 380V section The 80V section (21) is connected to the second 9F gas turbine accident safety section (23) through the second 9F gas turbine accident safety section diesel generator incoming line switch (22); the No. 2 diesel generator outlet 380V section (21) is connected to the black start 380V section (28) through the black start 380V section second incoming line switch (27); the black start diesel generator (24) is connected to the black start 380V section (28) through the black start diesel generator outlet circuit breaker (25); the black start 380V section (28) is connected to the 9E gas turbine high voltage standby section (11) through the black start transformer low voltage side switch (29), the black start transformer (30) and the 9E gas turbine high voltage standby section black start power incoming line switch (12).

3. The electrical system for the combined black start of 9E and 9F gas turbines according to claim 1 is characterized in that: The first 9E gas turbine high-voltage auxiliary power unit (3) comprises a first 9E gas turbine high-voltage auxiliary power bus (31), a first 9E gas turbine high-voltage auxiliary power bus working power supply incoming line switch (32) and a first 9E gas turbine high-voltage auxiliary power supply incoming line switch (33); The second 9E gas turbine high-voltage auxiliary power unit (7) comprises a second 9E gas turbine high-voltage auxiliary power bus (44), a second 9E gas turbine high-voltage auxiliary power bus working power supply incoming line switch (45) and a second 9E gas turbine high-voltage auxiliary power supply incoming line switch (46); The first 9E gas turbine high-voltage plant transformer (2) is connected to the first 9E gas turbine high-voltage plant bus (31) through the first 9E gas turbine high-voltage plant bus working power supply incoming line switch (32); the 9E gas turbine high-voltage standby section (11) is connected to the first 9E gas turbine high-voltage plant bus (31) through the first 9E gas turbine high-voltage plant bus standby power supply incoming line switch (33); the second 9E gas turbine high-voltage plant transformer (6) is connected to the second 9E gas turbine high-voltage plant bus (44) through the second 9E gas turbine high-voltage plant bus working power supply incoming line switch (45); the 9E gas turbine high-voltage standby section (11) is connected to the second 9E gas turbine high-voltage plant bus (44) through the second 9E gas turbine high-voltage plant bus standby power supply incoming line switch (46); The first 9F gas turbine high-voltage auxiliary power unit (4) is connected to the first 9E gas turbine high-voltage auxiliary power bus (31), and the second 9F gas turbine high-voltage auxiliary power unit (8) is connected to the second 9E gas turbine high-voltage auxiliary power bus (44).

4. The electrical system for the combined black start of 9E and 9F gas turbines according to claim 1 is characterized in that: The first 9F gas turbine high-voltage auxiliary power unit (4) comprises a first 9F gas turbine high-voltage auxiliary power bus (34), a first 9F gas turbine high-voltage auxiliary power bus working power supply incoming line switch (35), a first 9F gas turbine high-voltage auxiliary power supply incoming line switch (37) and an interconnection switch 1 (36); The second 9F gas turbine high-voltage auxiliary power unit (8) comprises a second 9F gas turbine high-voltage auxiliary power bus (47), a second 9F gas turbine high-voltage auxiliary power bus working power supply incoming line switch (48), a second 9F gas turbine high-voltage auxiliary power supply incoming line switch (50) and an interconnection switch 2 (49); The first 9F gas turbine main connection unit (5) is connected to the first 9F gas turbine high-voltage plant bus (34) via the first 9F gas turbine high-voltage plant bus working power supply incoming line switch (35); the first 9E gas turbine high-voltage plant power unit (3) is connected to the first 9F gas turbine high-voltage plant bus (34) via the interconnection switch 1 (36); The second 9F gas turbine main connection unit (9) is connected to the second 9F gas turbine high-voltage plant bus (47) via the second 9F gas turbine high-voltage plant bus working power supply line switch (48); the second 9E gas turbine high-voltage plant power unit (7) is connected to the second 9F gas turbine high-voltage plant bus (47) via the interconnection switch 2 (49); The second 9F gas turbine high-voltage plant bus (47) is connected to the first 9F gas turbine high-voltage plant bus (34) via the second 9F gas turbine high-voltage plant bus standby power supply incoming line switch (50) and the first 9F gas turbine high-voltage plant bus standby power supply incoming line switch (37).

5. The electrical system for the combined black start of 9E and 9F gas turbines according to claim 1 is characterized in that: The first 9F gas turbine main connection unit (5) comprises a first 9F gas turbine generator (42), a first 9F gas turbine outlet circuit breaker (43), a first 9F gas turbine main transformer (39), a first 9F gas turbine main transformer high-voltage side circuit breaker (40), a first 9F gas turbine high-voltage busbar (41) and a first 9F gas turbine high-voltage plant transformer (38); The second 9F gas turbine main connection unit (9) comprises a second 9F gas turbine generator (55), a second 9F gas turbine outlet circuit breaker (56), a second 9F gas turbine main transformer (52), a second 9F gas turbine main transformer high-voltage side circuit breaker (53), a second 9F gas turbine high-voltage busbar (54) and a second 9F gas turbine high-voltage plant transformer (51); The first 9F gas turbine generator (42) is connected to the low-voltage side of the first 9F gas turbine main transformer (39) via the first 9F gas turbine outlet circuit breaker (43); the first 9F gas turbine high-voltage busbar (41) is connected to the high-voltage side of the first 9F gas turbine main transformer (39) via the first 9F gas turbine main transformer high-voltage side circuit breaker (40); the low-voltage side of the first 9F gas turbine main transformer (39) is connected to the first 9F gas turbine high-voltage power plant unit (4) via the first 9F gas turbine high-voltage power plant transformer (38); The second 9F gas turbine generator (55) is connected to the low-voltage side of the second 9F gas turbine main transformer (52) via the second 9F gas turbine outlet circuit breaker (56), the second 9F gas turbine high-voltage bus (54) is connected to the high-voltage side of the second 9F gas turbine main transformer (52) via the second 9F gas turbine main transformer high-voltage side circuit breaker (53), and the low-voltage side of the second 9F gas turbine main transformer (52) is connected to the second 9F gas turbine high-voltage plant power unit (8) via the second 9F gas turbine high-voltage plant transformer (51).

6. A method for operating an electrical system for a combined black start of 9E and 9F gas turbines as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: 1) The black start diesel generator (24), No. 1 diesel generator (14) and No. 2 diesel generator (19) are ready; 2) The black start diesel generator (24) is started; 3) No. 1 diesel generator (14) and No. 2 diesel generator (19) are started, and the 9E gas turbine black start power supply unit (1) is ready; 4) Black start of 9E gas turbine; 5) Black start of the first 9F gas turbine; 6) Black start of the second 9F engine; 7) No. 1 diesel generator (14) and No. 2 diesel generator (19) are restored to hot standby status.

7. The electrical system working method for the combined black start of 9E and 9F gas turbines according to claim 6 is characterized in that: The specific operations of step 1) are: 11) putting the black start diesel generator (24) into hot standby mode; 12) putting the No. 1 diesel generator (14) into hot standby mode; 13) Put the No. 2 diesel generator (19) into hot standby mode.

8. The working method of the electrical system of the 9E and 9F gas turbine joint black start according to claim 6 is characterized in that: The specific operations of step 2) are: 21) The power grid collapses, the entire 9E unit loses power, the 9E gas turbine standby transformer (10), the first 9E gas turbine high-voltage plant busbar (31), the second 9E gas turbine high-voltage plant busbar (44), the first 9E gas turbine high-voltage plant transformer (2) and the second 9E gas turbine high-voltage plant transformer (6) are all in a power-off state, and the black start diesel generator (24) receives the black start command of the 9E unit; 22) The black start diesel generator (24) starts after receiving the black start command of the 9E unit, the speed of the black start diesel generator (24) increases to the rated speed, the black start diesel generator (24) is excited, and after the black start diesel generator (24) successfully builds up the voltage, the black start diesel generator outlet circuit breaker (25) is closed, and the black start 380V section (28) is energized; 23) Close the low-voltage side switch (29) of the black start transformer, and the black start transformer (30) is energized; close the black start power supply line switch (12) of the high-voltage standby section of the 9E gas turbine, and the high-voltage standby section (11) of the 9E gas turbine resumes power supply; 24) After the No. 1 diesel generator (14) and the No. 2 diesel generator (19) are connected to the black start 380V section (28), the 9E gas turbine black start power supply is ready.

9. The working method of the electrical system of the 9E and 9F gas turbine combined black start according to claim 6 is characterized in that: The specific operations of step 3) are: 31) 9F gas turbine lost power to the entire plant; 32) After the No. 1 diesel generator (14) and the No. 2 diesel generator (19) detect that the first 9F engine accident safety section (18) and the second 9F engine accident safety section (23) lose power, they are automatically started. When the No. 1 diesel generator (14) and the No. 2 diesel generator (19) reach the rated speed, the excitation is automatically put into operation, the No. 1 diesel generator (14) and the No. 2 diesel generator (19) successfully build up pressure, the No. 1 diesel generator output circuit breaker (15) and the No. 2 diesel generator output circuit breaker (20) are closed, and the black start 380V section (28) is energized; 33) The diesel generator incoming line switch (17) of the first 9F gas turbine accident safety section and the diesel generator incoming line switch (22) of the second 9F gas turbine accident safety section are closed, and the power supply of the first 9F gas turbine accident safety section (18) and the second 9F gas turbine accident safety section (23) is restored; 34) The loads on the first 9F engine accident safety section (18) and the second 9F engine accident safety section (23) are restored to power supply; 35) The outlet 380V section (16) of the No. 1 diesel generator is connected to the black start 380V section (28) through the first incoming line switch (26) of the black start 380V section; the outlet 380V section (21) of the No. 2 diesel generator is connected to the black start 380V section (28) through the second incoming line switch (27) of the black start 380V section.

10. The working method of the electrical system of the 9E and 9F gas turbine joint black start according to claim 6, characterized in that: The specific operations of step 4) are: 41) Close the first 9E gas turbine high-voltage plant bus standby power supply incoming switch (33), and provide the first 9E gas turbine high-voltage plant bus (31) with black start power through the 9E gas turbine high-voltage standby section (11); the first 9E gas turbine is started using the black start power provided by the 9E gas turbine high-voltage standby section (11), and after the first 9E gas turbine completes speed increase and purging, the first 9E gas turbine is set at a constant speed of 3000 rpm, the first 9E gas turbine generator voltage is built up to the rated voltage, and the first 9E gas turbine high-voltage plant transformer (2) resumes power supply; 42) The first 9E gas turbine high-voltage plant busbar standby power supply incoming line switch (33) is opened, and the first 9E gas turbine high-voltage plant busbar working power supply incoming line switch (32) is closed, and the first 9E gas turbine high-voltage plant busbar (31) is restored to be powered by the first 9E gas turbine high-voltage plant transformer (2); 43) Disconnect the black start power supply line switch (12) of the high-voltage standby section of the 9E gas turbine and the black start transformer low-voltage side switch (29), and the black start transformer (30) is powered off; 44) disconnecting the first incoming line switch (26) of the black start 380V section, disconnecting the second incoming line switch (27) of the black start 380V section, disconnecting the black start diesel generator outlet circuit breaker (25), and shutting down the black start 380V section (28); manually shutting down the black start diesel generator (24), and restoring the black start diesel generator (24) to a hot standby state after the shutdown is successful; Step 5) The specific operation process is: 51) Close the interconnection switch 1 (36), and the high-voltage auxiliary busbar (31) of the first 9E gas turbine provides black start power to the first 9F gas turbine through the interconnection switch 1 (36); 52) The first 9F gas turbine is started using the black start power supply provided by the first 9E gas turbine high-voltage plant busbar (31). After the first 9F gas turbine completes speed increase and purging, the first 9F gas turbine unit is set at a constant speed of 3000 rpm, the first 9F gas turbine generator (42) is built up to the rated voltage, the first 9F gas turbine generator outlet circuit breaker (43) is closed, and the first 9F gas turbine high-voltage plant transformer (38) resumes power supply; 53) Disconnect the first 9F gas turbine high-voltage plant bus interconnection switch 1 (36), close the first 9F gas turbine high-voltage plant bus working power supply line switch (35), and the first 9F gas turbine high-voltage plant bus (34) resumes power supply from the first 9F gas turbine high-voltage plant transformer (38); 54) Manually shut down the No. 1 diesel generator (14), and after the shutdown is successful, restore the No. 1 diesel generator (14) to the hot standby state; The specific operations of step 6) are: 61) Close the first 9F gas turbine high-voltage plant bus standby power supply incoming line switch (37) and the second 9F gas turbine high-voltage plant bus standby power supply incoming line switch (50), and the first 9F gas turbine high-voltage plant bus (34) provides black start power to the second 9F gas turbine high-voltage plant bus (47); 62) The second 9F gas turbine is started using the black start power provided by the first 9F gas turbine high-voltage plant busbar (34). After the second 9F gas turbine completes speed increase and purging, the unit speed of the second 9F gas turbine is set at 3000 rpm, the second 9F gas turbine generator (55) is built up to the rated voltage, the second 9F gas turbine generator outlet circuit breaker (56) is closed, and the second 9F gas turbine high-voltage plant transformer (51) resumes power supply; 63) The second 9F gas turbine high-voltage plant busbar standby power supply inlet switch (50) is disconnected, and the second 9F gas turbine high-voltage plant busbar working power supply inlet switch (48) is closed, and the second 9F gas turbine high-voltage plant busbar (47) is restored to be powered by the second 9F gas turbine high-voltage plant transformer (51); 64) Manually shut down the No. 2 diesel generator (19), and after the shutdown is successful, restore the No. 2 diesel generator (19) to the hot standby state.

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