CN112311014A - Automatic energy storage black start system and method for 220kV voltage level unit wiring hydropower station - Google Patents

Automatic energy storage black start system and method for 220kV voltage level unit wiring hydropower station Download PDF

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Publication number
CN112311014A
CN112311014A CN202011306653.4A CN202011306653A CN112311014A CN 112311014 A CN112311014 A CN 112311014A CN 202011306653 A CN202011306653 A CN 202011306653A CN 112311014 A CN112311014 A CN 112311014A
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switch
self
voltage
power
generator
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Inventor
寇水潮
牟春华
孙钢虎
高尚政
石冰
朱峻峰
林亿昌
陶荣
兀鹏越
柴琦
王小辉
田磊陈
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B15/00—Controlling
    • F03B15/02—Controlling by varying liquid flow
    • F03B15/04—Controlling by varying liquid flow of turbines
    • F03B15/06—Regulating, i.e. acting automatically
    • 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
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention relates to a self-energy-storage black start system and a method for a 220kV voltage class unit wiring hydropower station, which comprises a hydraulic generator, a high-voltage station transformer, a first 400V low-voltage station transformer, a second 400V low-voltage station transformer, a flood discharge gate diesel generator, a main transformer and a 220kV line, wherein the hydraulic generator is connected with the high-voltage station transformer and the high-voltage station transformer; and determining the maximum allowable operation time of the speed regulator after the oil pressure system loses power through experiments. When the hydropower station loses power, the guide vane is opened by self-energy storage of the speed regulator oil pressure system in time, the water wheel is adjusted to the rated rotating speed, the excitation system helps the generator to build the voltage to the rated voltage by using a direct current excitation mode, the service power system is further recovered, a line charging test is carried out, and the line power supply is recovered. If the generator does not successfully build the voltage within the maximum allowable operation time of the power failure of the speed regulator oil pressure system, the diesel generator is quickly started before the allowable time arrives, the plant power system is recovered, and the unit is assisted to perform black start; and the unit wiring hydropower station power supply is quickly sent out to help the power grid recover power supply.

Description

Automatic energy storage black start system and method for 220kV voltage level unit wiring hydropower station
Technical Field
The invention belongs to the technical field of hydropower station black start, and particularly relates to a 220kV voltage level unit wiring hydropower station self-energy storage black start system and method.
Background
The 'black start' of the hydroelectric generating set is one content of auxiliary services of four major power grids (frequency modulation, standby, peak regulation and black start), and a power plant with black start capability can be compensated by the auxiliary services of the power grids every year. The 'black start' refers to that the power station utilizes the characteristic of quick self start to provide plant power required by start under the condition that the power grid is totally black, the hydroelectric generating set starts to fix speed, the loaded excitation stator builds up voltage to reach the rated value, the cut-in FCB operation mode is stable, the voltage is boosted by a main transformer, the electricity is transmitted to an opposite side transformer substation through a transmission line to provide plant power for starting an opposite side generating set, the purpose of burning the original star fire is achieved, and the electrification of the power grid system is recovered. The currently known black start technology has the following problems: (1) when the hydro-turbine set is started by utilizing the self-energy storage of the speed regulator oil pressure system, the maximum allowable time of the speed regulator oil pressure system exists, and the potential safety hazard of the black start of the hydro-turbine set exists under the condition that the hydro-turbine set does not have a factory power supply; (2) the self-energy storage and diesel generator have not been combined for black start; (3) at present, no hydropower station black start technology related to wiring of the generator-transformer unit is available.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a self-energy-storage black start system and a self-energy-storage black start method for a 220kV voltage level unit wiring hydropower station, which can safely, quickly and reliably quickly send out a unit wiring hydropower station power supply under the condition that a transmission line loses power, and help a power grid to recover power supply.
The invention is realized by the following technical scheme:
a self-energy-storage black-start system of a 220kV voltage class unit wiring hydropower station comprises a hydraulic generator, a 10kV station bus, a first 400V self-electricity bus, a second 400V self-electricity bus, a 400V self-electricity networking switch, a 20kV disconnecting link and a 220kV line;
one end of the hydraulic generator is connected with the ground, and the power generation end is connected with the 10kV service bus through a high-voltage service transformer and a 10kV service incoming switch in sequence;
the second 400V self-power-utilization bus is connected with the 10kV station-service bus through a 400V self-power-utilization connecting switch, a first 400V self-power-utilization bus, a first 400V self-power-utilization switch, a first 400V low-voltage station-service transformer and a first 10kV feeder switch in sequence;
and one end T of the 20kV disconnecting link is connected to a common point where the hydraulic generator and the high-voltage station transformer are connected, and the other end of the 20kV disconnecting link is connected with the 220kV line through the main transformer, the grid-connected switch and the 220kV disconnecting link in sequence.
Preferably, the system also comprises a flood gate diesel generator and an interconnected 400V power switch;
the flood gate diesel generator is connected with the 10kV station bus through a 400V outlet switch, a second 400V low-voltage station transformer, a 10kV disconnecting link and a second 10kV feeder switch in sequence;
the interconnected 400V power switch is connected with the second 400V self-power utilization bus;
the brake switch utilizes electromagnetic force generated by electromagnetic induction to brake the hydraulic generator, one end T of the brake switch is connected with a common point connected with the hydraulic generator and the 20kV disconnecting link, and the other end of the brake switch is in short circuit with three-phase A, B, C.
Further, when the maximum allowable operation time after the hydraulic system of the hydraulic generator is power-off is determined, the grid-connected switch, the 10kV incoming line switch, the first 10kV feeder switch, the second 10kV feeder switch and the interconnected 400V power switch are all in a disconnected state, and are used for cutting off the working power supply of the oil pump of the hydraulic system of the hydraulic generator.
Further, before the hydraulic generator is started in a self-energy-storage black state, the brake switch, the grid-connected switch, the 220kV disconnecting switch and the second 10kV feeder switch are all in an off state, and the neutral point grounding disconnecting switch, the 20kV disconnecting switch, the 10kV incoming line switch, the first 10kV feeder switch, the first 400V self-power-consumption switch, the 400V self-power-consumption connecting switch and the 10kV disconnecting switch are all in an on state.
Further, before the water turbine generator is provided with a main transformer to charge the 220kV line, the 20kV disconnecting link, the grid-connected switch and the 220kV disconnecting link are all in a closed state.
Further, the hydro-generator is not successfully started within the time of Tmax, when the first 400V self-power-consumption bus and the second 400V self-power-consumption bus fail to recover power supply within the time of Tmax, namely after the Tmax is reached, the 10kV incoming line switch and the grid-connected switch are immediately disconnected, the 400V outlet switch and the second 10kV feeder line switch are closed, the terminal voltage build-up of the flood gate diesel generator is adjusted to the rated voltage, the first 400V self-power-consumption bus and the second 400V self-power-consumption bus recover power supply of the flood gate diesel generator, the guide vanes of the hydro-generator are opened, the hydro-generator is adjusted to the rated rotating speed of 136.4r/min, the hydro-generator builds voltage to the rated voltage, the hydro-generator is used for charging the 220kV line with the main transformer again, and the grid-connected switch is closed.
A self-energy-storage black-start method of a 220kV voltage class unit wiring hydropower station comprises the following steps:
1) adjusting the cold standby state of the 220kV line and the main transformer, closing the neutral point grounding disconnecting link and the 20kV disconnecting link, and entering the step 2);
2) checking the no-voltage state of the 10kV station bus, disconnecting the 400V outlet switch, the second 10kV feeder switch and the 10kV inlet switch, and closing the first 10kV feeder switch, the first 400V self-power-consumption switch and the 400V self-power-consumption connecting switch to enter the step 3);
3) manually inputting the water turbine generator technical water supply, starting timing, and entering the step 4);
4) adjusting the rotating speed to be 136.4r/min of the rotating speed of the hydraulic generator, setting the voltage to be 100% rated voltage, judging whether the timing time is less than or equal to the maximum allowed running time of self-energy storage black start to be Tmax, if the time requirement is met, closing the 10kV incoming line switch, and measuring the first 400V self-power-utilization bus and the second 400V self-power-utilization bus to be 400V rated voltage; if the time requirement is not met, immediately disconnecting the 10kV incoming line switch, starting the flood gate diesel generator to be in no-load state, and supplying power to the first 400V self-power bus and the second 400V self-power bus by the flood gate diesel generator; and go to step 5)
5) The hydraulic system oil pump working power supply of the hydraulic generator recovers power supply, the 220kV line and the main transformer are operated to convert heat for standby, the grid-connected switch is closed, and the step 6 is carried out;
6) checking and confirming that the voltage and the phase sequence of the opposite side of the 220kV line are correct, and entering the step 7);
7) and the 220kV line and the main transformer are in a cold standby state, the first 400V self-power switch is disconnected, the interconnected 400V power switch is closed, the hydraulic generator is operated to stop, and the second 10kV feeder switch and the 400V outlet switch are disconnected.
Further, the voltage of the hydraulic generator in the step 4) is 18 kV; starting the floodgate diesel generator to be unloaded, wherein the unloaded voltage Uab of the floodgate diesel generator is 400V, Ubc is 401V, Uca is 401V, the frequency f is 50.3Hz, the second 10kV feeder switch and the 400V outlet switch are closed, the 10kV station bus phase voltage Ua is 5.9kV, Ub is 6.0kV, Uc is 5.9kV, the first 400V station bus voltage Uab is 400.42V, Ubc is 400.65V, Uca is 400.11V, the second 400V station bus voltage Uab is 400.42V, Ubc is 400.59V, Uca is 400.26V.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention determines the maximum allowable operation time of the speed regulator after the oil pressure system loses power through tests. When the hydropower station loses power, the guide vane is opened by self-energy storage of the speed regulator oil pressure system in time, the water wheel is adjusted to the rated rotating speed, the excitation system helps the generator to build the voltage to the rated voltage by using a direct current excitation mode, the service power system is further recovered, a line charging test is carried out, and the line power supply is recovered. If the generator does not successfully build the voltage within the maximum allowable operation time of the power failure of the speed regulator oil pressure system, the diesel generator is quickly started before the allowable time arrives, the plant power system is recovered, and the black start of the unit is assisted.
Furthermore, the invention carries out the maximum operation allowable time test after the oil pressure system of the speed regulator loses power, pre-judges the maximum time that the equipment can bear in advance, makes the response of safety measures, improves the success probability of black start and ensures the safety of host equipment.
Furthermore, the hydraulic generator of the invention has pressure failure in the maximum allowable operation time, and the diesel generator is started in time to ensure the service safety, and the diesel generator is used as a backup of a self-energy storage mode to ensure that black actions can be smoothly carried out.
Furthermore, the hydraulic generator, the main transformer and the 220kV line are connected in a unit mode, so that the hydraulic generator, the main transformer and the 220kV line are few in equipment, simple in structure, convenient to operate during black start, capable of rapidly sending out a power supply and low in construction cost.
Furthermore, the invention adopts the electromagnetic force generated by the electromagnetic induction of the brake switch to stop the hydraulic generator, and the hydraulic generator can be quickly stopped in a short time under the condition of out-of-control.
Drawings
FIG. 1 is a schematic diagram of the black start principle of the present invention.
Fig. 2 is a schematic diagram of the principle of the present invention before black start.
Fig. 3 is a schematic diagram of the line charging principle of the present invention.
Fig. 4 is a schematic diagram of the black start when the self-energy storage cannot be started according to the present invention.
In the figure: 1-neutral point earthing knife switch; 2-a hydro-generator; 3, a brake switch; 4-high voltage service transformer; 5-10kV incoming line switch; 6-10kV factory bus; 7-a first 10kV feeder switch; 8-a first 400V low-voltage station transformer; 9-first 400V self-powered switch; 10-a first 400V self-powered bus; 11-a second 400V self-electricity-using bus; the 12-400V self-powered electrical connection switch; 13-20kV disconnecting link; 14-a main transformer; 15-a grid-connected switch; 16-220kV disconnecting link; 17-220kV line; 18-a floodgate diesel generator; 19-400V outlet switch; 20-a second 400V low-voltage station transformer; 21-10kV disconnecting link; 22-a second 10kV feeder switch; 23-interconnected 400V power switches.
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 relates to a self-energy-storage black start system and a method for a 220kV voltage class unit wiring hydropower station, which comprises a hydraulic generator, a high-voltage station transformer, a first 400V low-voltage station transformer, a second 400V low-voltage station transformer, a flood discharge gate diesel generator, a main transformer and a 220kV line, wherein the hydraulic generator is connected with the high-voltage station transformer and the high-voltage station transformer; the invention determines the maximum allowable operation time of the speed regulator after the oil pressure system loses power through tests. When the hydropower station loses power, the guide vane is opened by self-energy storage of the speed regulator oil pressure system in time, the water wheel is adjusted to the rated rotating speed, the excitation system helps the generator to build the voltage to the rated voltage by using a direct current excitation mode, the service power system is further recovered, a line charging test is carried out, and the line power supply is recovered. If the generator does not successfully build the voltage within the maximum allowable operation time of the power failure of the speed regulator oil pressure system, the diesel generator is quickly started before the allowable time arrives, the plant power system is recovered, and the unit is assisted to perform black start; the invention can safely, quickly and reliably send out the unit wiring hydropower station power supply quickly, and helps the power grid recover power supply.
As shown in fig. 1, the self-energy-storage black-start system of the 220kV voltage class unit-connection hydropower station comprises a hydro-generator 2, a 10kV service bus 6, a first 400V self-service bus 10, a second 400V self-service bus 11, a 400V self-service electrical contact switch 12, a 20kV disconnecting link 13, and a 220kV line 17;
one end of the hydraulic generator 2 is connected with the ground, and the power generation end is connected with the 10kV service bus 6 through a high-voltage service transformer 4 and a 10kV service incoming switch 5 in sequence;
the second 400V self-power-utilization bus 11 is connected with the 10kV service bus 6 through a 400V self-power-utilization connecting switch 12, a first 400V self-power-utilization bus 10, a first 400V self-power-utilization switch 9, a first 400V low-voltage service transformer 8 and a first 10kV feeder switch 7 in sequence;
one end T of the 20kV disconnecting link 13 is connected to a common point where the hydraulic generator 2 and the high-voltage station transformer 4 are connected, and the other end of the 20kV disconnecting link is connected with the 220kV line 17 through a main transformer 14, a grid-connected switch 15 and a 220kV disconnecting link 16 in sequence.
In this embodiment, the specific parameters of the hydraulic generator 2 are as follows:
Figure BDA0002787778680000061
Figure BDA0002787778680000071
in this embodiment, the specific parameters of the 220kV line 17 are as follows:
Figure BDA0002787778680000072
in this embodiment, the specific parameters of the main transformer are as follows:
model number SFP8-380000/220 Rated capacity 380MVA
Rated voltage 236kV±2×2.5％/18kV Rated frequency 50Hz
Rated current 929.9/12188.5A Connecting set Yn,d11
Manufacturer of the product Xi'an transformer factory Impedance voltage 16.5％
No load current 0.2％ No load loss 163.75kW
In this embodiment, the specific parameters of the high-voltage station transformer 4 are as follows:
Figure BDA0002787778680000073
in the embodiment, the electric power generating system further comprises a flood gate diesel generator 18 and an interconnected 400V power switch 23;
the flood gate diesel generator 18 is connected with the 10kV station bus 6 through a 400V outlet switch 19, a second 400V low-voltage station transformer 20, a 10kV disconnecting link 21 and a second 10kV feeder switch 22 in sequence;
the interconnected 400V power switch 23 is connected with the second 400V self-power-utilization bus 11;
the brake switch 3 utilizes electromagnetic force generated by electromagnetic induction to brake the hydraulic generator 2, one end T of the brake switch is connected with a common point connected with the hydraulic generator 2 and the 20kV disconnecting link 13, the other end of the brake switch short-circuits the three phases A, B, C, and the brake switch 3 is only in a closed state when the hydraulic generator 2 needs to brake.
In this embodiment, the specific parameters of the flood gate diesel generator 18 are as follows:
Figure BDA0002787778680000074
Figure BDA0002787778680000081
in this embodiment, when the maximum allowable operation time after the power failure of the hydraulic system of the hydraulic generator is determined, the grid-connected switch 15, the 10kV inlet switch 5, the first 10kV feeder switch 7, the second 10kV feeder switch 22, and the interconnected 400V power switch 23 are all in an off state, and are used for cutting off the working power supply of the oil pump of the hydraulic system of the hydraulic generator 2, recording the pressure Pbt of the hydraulic system before the test, turning on the hydraulic generator 2, adjusting the rotation speed to be the rated rotation speed of 136.4r/min, recording the time Te when the pressure of the hydraulic system of the hydraulic generator 2 drops to the minimum operation oil pressure Pmin, calculating the oil pressure dropping speed of the hydraulic system of the hydraulic generator 2 to be (Pbt-Pmin)/Te, and pre-judging the maximum allowable operation time of self-storing black start to be Tmax-Pmin/V according to the pressure Pzcn of the hydraulic system before the self-storing black start of, namely, the hydraulic generator 2 must be successfully started within the time Tmax, and the power supply of the first 400V self-power utilization bus 10 and the second 400V self-power utilization bus 11 must be recovered at the time Tmax.
In this embodiment, the hydraulic system of the hydraulic generator is adjusted to a rated oil pressure of 3.95Mpa, the hydraulic system is started to an idle speed of 136.4r/min, and after the hydraulic system is operated for 22min, the oil pressure of the hydraulic system is close to the lowest operation oil pressure of 3.2Mpa, and the oil pressure reduction rate is 0.021 Mpa/min.
As shown in fig. 2, before the hydraulic generator 2 is started in a self-energy-storage black state, the brake switch 3, the grid-connected switch 15, the 220kV disconnecting link 16, and the second 10kV feeder switch 22 are all in an off state, the neutral point grounding disconnecting link 1, the 20kV disconnecting link 13, the 10kV incoming line switch 5, the first 10kV feeder switch 7, the first 400V self-powered switch 9, the 400V self-powered connecting link switch 12, and the 10kV disconnecting link 21 are all in a closed state, the hydraulic generator 2 is adjusted to have a rated rotation speed of 136.4r/min, the hydraulic generator 2 is pressurized to a rated voltage by a direct-current excitation method, the first 400V self-powered bus 10 and the second 400V self-powered bus 11 are restored to be powered, the oil pump working power supply of the hydraulic system of the hydraulic generator 2 is restored, and the hydraulic system of the hydraulic generator 2 is adjusted to a rated oil pressure.
As shown in fig. 3, before the main transformer 14 of the hydraulic generator 2 charges the 220kV line 17, the 20kV disconnecting link 13, the grid-connected switch 15 and the 220kV disconnecting link 16 are all in a closed state, the voltage built at the generator end of the hydraulic generator 2 is 100% of the rated voltage, and the voltage at the opposite side of the 220kV line 17 is checked and confirmed to be the rated voltage.
As shown in fig. 4, when the hydraulic generator 2 fails to start successfully within the time Tmax, the first 400V self-power bus 10 and the second 400V self-power bus 11 fail to recover power supply at the time Tmax, namely, immediately disconnecting the 10kV inlet switch 5 and the grid-connected switch 15 after the Tmax is reached, closing the 400V outlet switch 19 and the second 10kV feeder switch 22, adjusting the voltage build-up at the terminal of the flood gate diesel generator 18 to the rated voltage, the first 400V self-electricity utilization bus 10 and the second 400V self-electricity utilization bus 11 recover to be supplied with power by the flood discharge gate diesel generator 18, the guide vanes of the hydraulic generator 2 are opened, the hydraulic generator 2 is adjusted to have the rated rotating speed of 136.4r/min, and the hydraulic generator 2 builds voltage to rated voltage, the hydraulic generator 2 with the main transformer 14 charges the 220kV line 17 again, and the grid-connected switch 15 is closed.
A self-energy-storage black-start method of a 220kV voltage class unit wiring hydropower station comprises the following steps:
1) adjusting the cold standby states of the 220kV line 17 and the main transformer 14, closing the neutral point grounding disconnecting link 1 and the 20kV disconnecting link 13, and entering the step 2);
2) checking the no-voltage state of the 10kV station bus 6, disconnecting the 400V outlet switch 19, the second 10kV feeder switch 22 and the 10kV incoming line switch 5, closing the first 10kV feeder switch 7, the first 400V self-power-utilization switch 9 and the 400V self-power-utilization connecting switch 12, and entering the step 3);
3) manually inputting the technical water supply of the hydraulic generator 2, starting timing, and entering the step 4);
4) adjusting the rotating speed to be 136.4r/min of the rotating speed of the hydraulic generator 2, setting the voltage to be 100% rated voltage, judging whether the timing time is less than or equal to the maximum allowed running time of self-energy-storage black start to be Tmax, if the time requirement is met, closing the 10kV incoming line switch 5, and measuring that the first 400V self-power bus 10 and the second 400V self-power bus 11 are at the rated voltage of 400V; if the time requirement is not met, the 10kV incoming line switch 5 is immediately disconnected, the flood gate diesel generator 18 is started to be in no-load, and the first 400V self-power bus 10 and the second 400V self-power bus 11 are powered by the flood gate diesel generator 18; and go to step 5)
5) The hydraulic system oil pump working power supply of the hydraulic generator 2 recovers power supply, the 220kV line 17 and the main transformer 14 are operated to convert heat for standby, the grid-connected switch 15 is closed, and the step 6 is carried out;
6) checking and confirming that the voltage and the phase sequence of the opposite side of the 220kV line 17 are correct, and entering the step 7);
7) and (3) switching the 220kV line 17 and the main transformer 14 to a cold standby state, disconnecting the first 400V self-service electric switch 9, closing the interconnected 400V power switch 23, operating the hydraulic generator 2 to stop, and disconnecting the second 10kV feeder switch 22 and the 400V outlet switch 19).
In this embodiment, the voltage of the hydraulic generator 2 in the step 4) is 18 kV; starting the floodgate diesel generator 18 to be unloaded, wherein the unloaded voltage Uab of the floodgate diesel generator 18 is 400V, Ubc is 401V, Uca is 401V, the frequency f is 50.3Hz, closing the second 10kV feeder switch 22 and the 400V outlet switch 19, the 10kV plant bus 6-phase voltage Ua is 5.9kV, Ub is 6.0kV, Uc is 5.9kV, the first 400V self-use bus 10-voltage Uab is 400.42V, Ubc is 400.65V, Uca is 400.11V, the second 400V self-use bus 11-voltage Uab is 400.42V, Ubc is 400.59V, Uca is 400.26V.
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 (8)

1. The automatic energy storage black start system of the 220kV voltage class unit wiring hydropower station is characterized by comprising a hydraulic generator (2), a 10kV station bus (6), a first 400V automatic power bus (10), a second 400V automatic power bus (11), a 400V automatic power connection switch (12), a 20kV disconnecting link (13) and a 220kV line (17);
one end of the hydraulic generator (2) is connected with the ground, and the power generation end is connected with the 10kV service bus (6) through a high-voltage service transformer (4) and a 10kV service incoming switch (5) in sequence;
the second 400V self-power-utilization bus (11) is connected with the 10kV station-utilization bus (6) through a 400V self-power-utilization connecting switch (12), a first 400V self-power-utilization bus (10), a first 400V self-power-utilization switch (9), a first 400V low-voltage station-utilization transformer (8) and a first 10kV feeder switch (7) in sequence;
and one end T of the 20kV disconnecting link (13) is connected to a common point where the hydraulic generator (2) and the high-voltage station transformer (4) are connected, and the other end of the 20kV disconnecting link is connected with the 220kV line (17) through a main transformer (14), a grid-connected switch (15) and a 220kV disconnecting link (16) in sequence.
2. The self-energy-storage black-start system of a 220kV voltage class unit-wired hydropower station of claim 1, further comprising a flood gate diesel generator (18) and an interconnected 400V power switch (23);
the flood gate diesel generator (18) is connected with the 10kV station-used bus (6) through a 400V outlet switch (19), a second 400V low-voltage station-used transformer (20), a 10kV disconnecting link (21) and a second 10kV feeder switch (22) in sequence;
the interconnected 400V power switch (23) is connected with the second 400V self-power-utilization bus (11);
the brake switch (3) utilizes electromagnetic force generated by electromagnetic induction to brake the hydraulic generator (2), one end T of the brake switch is connected with a common point connected with the hydraulic generator (2) and the 20kV disconnecting link (13), and the other end of the brake switch is in short circuit with the three-phase A, B, C.
3. The self-energy-storage black-start system of the 220kV voltage class unit-connected hydropower station according to claim 2, wherein when the maximum allowable operation time of the hydraulic system of the hydraulic generator (2) after power failure is determined, the grid-connected switch (15), the 10kV incoming switch (5), the first 10kV feeder switch (7), the second 10kV feeder switch (22) and the interconnected 400V power switch (23) are all in an off state, and are used for cutting off an oil pump working power supply of the hydraulic system of the hydraulic generator (2).
4. The self-energy-storage black start system of the 220kV voltage class unit-connection hydropower station according to claim 3, wherein before the hydro-generator (2) is subjected to self-energy-storage black start, the brake switch (3), the grid-connected switch (15), the 220kV disconnecting link (16) and the second 10kV feeder switch (22) are all in an open state, and the neutral point grounding disconnecting link (1), the 20kV disconnecting link (13), the 10kV incoming line switch (5), the first 10kV feeder switch (7), the first 400V self-powered switch (9), the 400V self-powered electrical connecting switch (12) and the 10kV disconnecting link (21) are all in a closed state.
5. The self-energy-storage black-start system of the 220kV voltage class unit-connected hydropower station according to claim 4, wherein the 20kV disconnecting link (13), the grid-connected switch (15) and the 220kV disconnecting link (16) are in a closed state before the hydro-generator (2) is charged with the main transformer (14) to the 220kV line (17).
6. The self-energy-storage black-start system of the 220kV voltage class unit-wired hydropower station according to claim 3, wherein the hydraulic generator (2) is not successfully started within the time Tmax, the first 400V self-power bus (10) and the second 400V self-power bus (11) are not successfully started within the time Tmax, when the power supply is restored at Tmax, namely after the time Tmax is reached, the 10kV inlet switch (5) and the grid-connected switch (15) are opened, the 400V outlet switch (19) and the second 10kV feeder switch (22) are closed, the terminal voltage of the flood gate diesel generator (18) is adjusted to be built to the rated voltage, the first 400V self-power bus (10) and the second 400V self-power bus (11) are restored to be supplied by the flood gate diesel generator (18), the guide vane of the hydraulic generator (2) is opened, and the hydraulic generator (2) is adjusted to be at the rated rotating speed of 136.4r/min, and the hydraulic generator (2) builds voltage to rated voltage, the hydraulic generator (2) with the main transformer (14) charges the 220kV line (17), and the grid-connected switch (15) is closed.
7. The self-energy-storage black-start method of the 220kV voltage class unit wiring hydropower station is characterized by comprising the following steps of:
1) adjusting the cold standby states of the 220kV line (17) and the main transformer (14), closing the neutral point grounding disconnecting link (1) and the 20kV disconnecting link (13), and entering the step 2);
2) checking a non-voltage state of the 10kV station bus (6), disconnecting the 400V outlet switch (19), the second 10kV feeder switch (22) and the 10kV incoming line switch (5), closing the first 10kV feeder switch (7), the first 400V self-service electric switch (9) and the 400V self-service electric connecting switch (12), and entering the step 3;
3) manually inputting the technical water supply of the hydraulic generator (2), starting timing, and entering the step 4);
4) adjusting the rotating speed to be 136.4r/min of the rotating speed of the hydraulic generator (2), setting the voltage to be 100% rated voltage, judging whether the timing time is less than or equal to the self-energy-storage black start maximum allowable running time to be Tmax, if the time requirement is met, closing the 10kV incoming line switch (5), and measuring the first 400V self-power-utilization bus (10) and the second 400V self-power-utilization bus (11) to be the rated voltage of 400V; if the time requirement is not met, immediately disconnecting the 10kV incoming line switch (5), starting the flood gate diesel generator (18) to be in no-load state, and supplying power to the first 400V self-service bus (10) and the second 400V self-service bus (11) by the flood gate diesel generator (18); and go to step 5)
5) The hydraulic system oil pump working power supply of the hydraulic generator (2) recovers power supply, the 220kV line (17) and the main transformer (14) are operated to convert heat for standby, the grid-connected switch (15) is closed, and the step 6 is carried out;
6) checking and confirming that the voltage and the phase sequence of the opposite side of the 220kV line (17) are correct, and entering the step 7);
7) and the 220kV line (17) and the main transformer (14) are in a cold standby state, the first 400V self-service electric switch (9) is disconnected, the interconnected 400V power switch (23) is closed, the hydraulic generator (2) is operated to stop, and the second 10kV feeder switch (22) and the 400V outlet switch (19) are disconnected.
8. The self-energy-storage black-start method of the 220kV voltage-class unit-connected hydropower station according to claim 7, wherein the voltage of the hydraulic generator (2) in the step 4) is 18 kV; starting the floodgate diesel generator (18) to be unloaded, wherein the unloaded voltage Uab of the floodgate diesel generator (18) is 400V, Ubc is 401V, Uca is 401V, the frequency f is 50.3Hz, closing the second 10kV feeder switch (22) and the 400V outlet switch (19), the phase voltage Ua of the 10kV service bus (6) is 5.9kV, Ub is 6.0kV, Uc is 5.9kV, the voltage Uab of the first 400V service bus (10) is 400.42V, Ubc is 400.65V, Uca is 400.11V, the voltage Uab of the second 400V service bus (11) is 400.42V, Ubc is 400.59V, Uca is 400.26V.
CN202011306653.4A 2020-11-19 2020-11-19 Automatic energy storage black start system and method for 220kV voltage level unit wiring hydropower station Pending CN112311014A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113113937A (en) * 2021-04-06 2021-07-13 四川华能涪江水电有限责任公司 Excitation system of hydropower station black start unit and grid-connected signal input and removal method
CN114825452A (en) * 2022-06-29 2022-07-29 西安热工研究院有限公司 Thermal power high-voltage direct-hanging energy storage black start system
CN116565961A (en) * 2023-07-07 2023-08-08 华能澜沧江水电股份有限公司 One-key starting control method and system for diesel generator with station service bus of hydropower station

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113113937A (en) * 2021-04-06 2021-07-13 四川华能涪江水电有限责任公司 Excitation system of hydropower station black start unit and grid-connected signal input and removal method
CN114825452A (en) * 2022-06-29 2022-07-29 西安热工研究院有限公司 Thermal power high-voltage direct-hanging energy storage black start system
CN116565961A (en) * 2023-07-07 2023-08-08 华能澜沧江水电股份有限公司 One-key starting control method and system for diesel generator with station service bus of hydropower station
CN116565961B (en) * 2023-07-07 2023-09-08 华能澜沧江水电股份有限公司 One-key starting control method and system for diesel generator with station service bus of hydropower station

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