CN112311012A - Black start system and method for 220kV voltage-class internal and external bridge connection non-high-rise factory substation - Google Patents
Black start system and method for 220kV voltage-class internal and external bridge connection non-high-rise factory substation Download PDFInfo
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- CN112311012A CN112311012A CN202011306651.5A CN202011306651A CN112311012A CN 112311012 A CN112311012 A CN 112311012A CN 202011306651 A CN202011306651 A CN 202011306651A CN 112311012 A CN112311012 A CN 112311012A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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Abstract
The invention discloses a black start system of a 220kV voltage class internal and external bridge connection non-high-voltage factory transformer substation, which comprises a first hydraulic generator, a first 10kV circuit breaker, a first 10kV isolation disconnecting link, a first three-winding transformer, a first 220kV isolation disconnecting link, a second 220kV isolation disconnecting link, a first 220kV circuit breaker, a third 220kV isolation disconnecting link, a fourth 220kV isolation disconnecting link, a first 220kV circuit, a first 6kV switch and a first 6kV bus; according to the system, a first hydraulic generator utilizes a self-speed regulator oil pressure system to store energy, a guide vane is opened and adjusted to a rated rotating speed, an excitation system is operated to build the voltage of a generator end to the rated voltage, a superior transformer substation is assisted to recover power supply, the normal operation of a power grid load is ensured, and the power failure loss is reduced; the system is not provided with a special high-voltage station transformer, and directly uses a three-winding transformer as a main transformer and a station transformer, so that the primary system wiring is simplified, the operation step of recovering station power from black start is reduced, the investment of primary equipment is reduced, and the power supply is rapidly sent out during the black start.
Description
Technical Field
The invention belongs to the technical field of black start, and particularly relates to a black start system and method for a 220kV voltage-class internal and external bridge connection-free high-voltage plant substation.
Background
The information technology, big data technology and block chain technology which are accompanied in the current power technology are rapidly developed, the power supply type is developed from a single thermal power type to diversified energy types, physical characteristics presented by some energy sources are friendly to a power grid, for example, a unit with black start capability can relieve the power loss pressure of a power system at a critical moment, and some energy sources are limited by self factors and do not have the black start capability, and the energy conversion and the sending out can be realized only by recovering the self operation with the help of external energy sources. The requirements of black start on the black start are fast, stable and accurate from the perspective of a power grid, all units with capacity develop towards the directions of short time, high stability and accurate voltage build-up, when a power failure accident occurs, how to simplify operation procedures and simplify one-time equipment wiring become research key points, generally, the black start units are all provided with high-voltage station transformers, corresponding switches and disconnecting links are additionally arranged, the operation steps are more during black start, the black start is not beneficial to fast sending out at the first time, and meanwhile, the application of internal and external bridging lines in the black start units is not seen yet at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a black start system and a method for a 220kV voltage-class internal and external bridge connection-free high-rise substation, which reduce the operation steps of recovering service power during black start, reduce the investment of primary equipment and realize the quick power supply sending during black start.
The invention is realized by the following technical scheme:
a black start system of a 220kV voltage-class internal and external bridge connection non-high-voltage factory substation comprises a first hydraulic generator, a first three-winding transformer, a first 220kV line and a first 6kV bus;
the first hydraulic generator is connected with the star-shaped side of the low-voltage winding of the first three-winding transformer through a first 10kV circuit breaker and a first 10kV isolation disconnecting link in sequence;
the triangular side of the high-voltage winding of the first three-winding transformer is connected with a first 220kV circuit through a first 220kV isolation disconnecting link, a second 220kV isolation disconnecting link, a first 220kV circuit breaker, a third 220kV isolation disconnecting link and a fourth 220kV isolation disconnecting link in sequence;
and the triangular side of the low-voltage winding of the first three-winding transformer is connected with a first 6kV bus through a first 6kV switch.
Preferably, the system further comprises a second hydro-generator, a second 220kV line and a second 6kV bus;
the second hydraulic generator is connected with the star-shaped side of the low-voltage winding of the second three-winding transformer through a second 10kV circuit breaker and a second 10kV isolation disconnecting link;
the triangular side of the high-voltage winding of the second three-winding transformer is connected with a second 220kV circuit through a fifth 220kV isolation disconnecting link, a sixth 220kV isolation disconnecting link, a second 220kV circuit breaker, a seventh 220kV isolation disconnecting link and an eighth 220kV isolation disconnecting link in sequence;
and the triangular side of the low-voltage winding of the second three-winding transformer is connected with a second 6kV bus through a second 6kV switch.
Preferably, the device also comprises a 6kV interconnection switch, a ninth 220kV isolation disconnecting link, a third 220kV circuit breaker, a tenth 220kV isolation disconnecting link, an eleventh 220kV isolation disconnecting link, a fourth 220kV circuit breaker and a twelfth 220kV isolation disconnecting link;
one end of the 6kV interconnection switch is connected with the first 6kV bus, and the other end of the 6kV interconnection switch is connected with the second 6kV bus;
the ninth 220kV isolation disconnecting link, the third 220kV circuit breaker and the tenth 220kV isolation disconnecting link are connected in series, one end of the ninth 220kV isolation disconnecting link is connected with a common point of the first 220kV isolation disconnecting link and the second 220kV isolation disconnecting link, and one end of the tenth 220kV isolation disconnecting link is connected with a common point of the fifth 220kV isolation disconnecting link and the sixth 220kV isolation disconnecting link;
the eleventh 220kV isolation disconnecting link, the fourth 220kV circuit breaker and the twelfth 220kV isolation disconnecting link are connected in series, one end of the eleventh 220kV isolation disconnecting link is connected with a common point of the third 220kV isolation disconnecting link and the fourth 220kV isolation disconnecting link, and one end of the twelfth 220kV isolation disconnecting link is connected with a common point of the seventh 220kV isolation disconnecting link and the eighth 220kV isolation disconnecting link.
Preferably, before the first water turbine generator with the first three-winding transformer and the first 220kV line is in black start, the first 10kV isolation switch, the first 220kV isolation switch, the second 220kV isolation switch, the third 220kV isolation switch, the fourth 220kV isolation switch, the second 10kV circuit breaker, the second 10kV isolation switch, the fifth 220kV isolation switch, the sixth 220kV isolation switch, the second 220kV circuit breaker, the seventh 220kV isolation switch, the eighth 220kV isolation switch, the second 6kV switch, and the 6kV interconnection switch are all in a closed state, and the first 10kV circuit breaker, the first 220kV circuit breaker, the first 6kV switch, the ninth 220kV isolation switch, the third 220kV circuit breaker, the tenth 220kV isolation switch, the eleventh 220kV isolation switch, the fourth 220kV circuit breaker, and the twelfth 220kV isolation switch are all in an open state; the first hydraulic generator, the first three-winding transformer and the first 220kV line are in a power failure state, the second hydraulic generator, the second three-winding transformer, the second 220kV line and the second 6kV bus are in a charged state, and the first 6kV bus is in power supply through the second 6kV bus in a communicating mode.
Still further, when the first hydraulic generator recovers to supply power to the first 6kV bus, the first hydraulic generator builds voltage to rated voltage, the 6kV interconnection switch is in an off state, and the first 10kV circuit breaker and the first 6kV switch are in a closed state.
And when the first hydraulic generator recovers to supply power to the first 6kV bus, the first hydraulic generator is started to a rated rotating speed from energy storage by using the speed regulator oil pressure system, the voltage is built at the generator end to a rated voltage, the 6kV contact switch is firstly disconnected, and then the first 10kV circuit breaker and the first 6kV switch are closed, so that the first hydraulic generator is operated by the factory power supply with the first 6kV bus.
Still further, when the first hydro-generator is charged with the first three-winding transformer and the first 220kV line, the first 220kV circuit breaker is in a closed state, and voltages at two ends of the first 220kV line are both rated voltages.
Preferably, the rated voltage of the first hydro-generator and the rated voltage of the second hydro-generator are both 10.5kV, and the rated voltage of three sides of the first three-winding transformer and the rated voltage of three sides of the second three-winding transformer are both 242kV/10.5kV/6.3 kV.
A black start method for a 220kV voltage-class internal and external bridge connection non-high-voltage factory substation comprises the following steps:
1) when the first hydro-generator with the first three-winding transformer and the first 220kV line are started in a black mode, checking and confirming that the ninth 220kV isolation disconnecting link, the third 220kV circuit breaker, the tenth 220kV isolation disconnecting link, the eleventh 220kV isolation disconnecting link and the fourth 220kV circuit breaker are all in a disconnected state, and entering the step 2);
2) disconnecting the 6kV interconnection switch, detecting a shutdown state of the first hydraulic generator when the first 6kV bus is in a power failure state, and entering the step 3 when the first three-winding transformer and the first 220kV line are in a power failure state;
3) closing the first 10kV isolation disconnecting link, the first 220kV isolation disconnecting link, the second 220kV isolation disconnecting link, the third 220kV isolation disconnecting link and the fourth 220kV isolation disconnecting link in sequence, and entering the step 4);
4) starting up to a rated rotating speed by using the oil pressure of an oil pressure system of a speed regulator of the first hydraulic generator, operating an excitation system to enable the first hydraulic generator to build voltage to a rated voltage, closing a first 10kV circuit breaker, and entering the step 5);
5) closing a first 6kV switch, recovering power supply of the first 6kV bus, and entering the step 6);
6) closing a first 220kV circuit breaker, charging a first 220kV line by the first water wheel generator, and entering the step 7);
7) and checking that the phase sequence of the voltage on the current side and the opposite side of the first 220kV line is correct, indicating that the voltage is the rated voltage, and finishing the black start of the first water turbine generator with the first three-winding transformer and the first 220kV line.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the first hydraulic generator utilizes the self-energy storage of the self-governor oil pressure system, the guide vane is opened and adjusted to the rated rotation speed, the excitation system is operated to build the voltage of the generator terminal to the rated voltage, the first 10kV circuit breaker and the first 6kV switch are closed, the characteristic of the first three-winding transformer is fully utilized, the first 6kV bus power supply is recovered in time when the first hydraulic generator is used as a booster transformer and a service transformer, the stable operation of the self-service load island of the first hydraulic generator is realized, then the first 220kV circuit breaker is closed, the power supply of the first hydraulic generator is sent to the first 220kV line in the first time, the upper-level transformer substation is assisted to recover the power supply, the normal operation of the power grid load is ensured.
Furthermore, the first three-winding transformer and the second three-winding transformer are used as a boosting transformer and a service transformer, so that the investment of the service transformer is reduced, redundant service system switches and disconnecting links are not required to be arranged, and the fast operation is convenient during black start.
Furthermore, the first hydraulic generator is started in time and is pressurized to a rated voltage by utilizing the energy stored by the hydraulic energy storage system of the speed regulator, the power supply of the hydraulic energy storage system of the speed regulator is quickly recovered, the stable operation of the first hydraulic generator with service power is ensured under the condition of no external power supply, and the power supply is sent to a place needing power supply at any time.
Furthermore, the first 6kV bus and the second 6kV bus are provided with 6kV interconnection switches, so that 6kV service systems of the two units are interconnected for standby, the safety of the 6kV service systems is further improved, after the first hydraulic generator is successfully started in a black state, the second 6kV bus can be supplied with power through the 6kV interconnection switches, the first hydraulic generator can also be started in a black state, and the two units can be started in a black state under the condition that the two lines are both sent out and are powered off.
Furthermore, the invention adopts a connection mode of combining the inner bridge and the outer bridge, so that the primary system has the characteristics of the inner bridge and the outer bridge, realizes the complementation of the quality of two kinds of connection, increases the flexibility of the primary system, and is convenient for switching between two lines during black start.
Drawings
FIG. 1 is a schematic diagram of a black start system according to the present invention.
Fig. 2 is a state diagram of the system of the first hydro-generator of the present invention before black start with the first 220kV line.
Fig. 3 is a state diagram of the first hydraulic generator recovering the first 6kV bus power supply system according to the present invention.
Fig. 4 is a state of charge diagram of a first hydro-generator with a first 220kV line according to the present invention.
In the figure: a first hydro-generator 1; a first 10kV circuit breaker 2; a first 10kV isolation switch 3; a first three-winding transformer 4; a first 220kV isolation switch 5; a second 220kV isolation disconnecting link 6; a first 220kV circuit breaker 7; a third 220kV isolation switch 8; a fourth 220kV isolation switch 9; a first 220kV line 10; a first 6kV switch 11; a first 6kV bus 12; a second hydro-generator 13; a second 10kV circuit breaker 14; a second 10kV isolation switch 15; a second three-winding transformer 16; a fifth 220kV isolation switch 17; a sixth 220kV isolation switch 18; a second 220kV circuit breaker 19; a seventh 220kV isolation switch 20; an eighth 220kV isolation switch 21; a second 220kV line 22; a second 6kV switch 23; a second 6kV bus 24; a 6kV interconnection switch 25; a ninth 220kV isolation switch 26; a third 220kV circuit breaker 27; a tenth 220kV isolation switch 28; an eleventh 220kV isolation switch 29; a fourth 220kV circuit breaker 30; a twelfth 220kV isolation switch 31.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention can solve the problem that the existing black start unit is separately provided with the high-voltage station transformer, does not need to be provided with a special high-voltage station transformer, realizes the functions of the step-up transformer and the station transformer by using the three-winding transformer, simplifies primary system wiring and is very favorable for the operation of black start.
The invention relates to a black start system of a 220kV voltage class internal and external bridging line free high-voltage factory substation, which is shown in figure 1, and comprises a first hydraulic generator 1, a first 10kV circuit breaker 2, a first 10kV isolation disconnecting link 3, a first three-winding transformer 4, a first 220kV isolation disconnecting link 5, a second 220kV isolation disconnecting link 6, a first 220kV circuit breaker 7, a third 220kV isolation disconnecting link 8, a fourth 220kV isolation disconnecting link 9, a first 220kV circuit 10, a first 6kV switch 11 and a first 6kV bus 12; the first hydraulic generator 1 is connected with the low-voltage winding star side of the first three-winding transformer 4 through a first 10kV circuit breaker 2, a first 10kV isolation disconnecting link 3, the high-voltage winding triangle side of the first three-winding transformer 4 is connected with the first 220kV isolation disconnecting link 5, a second 220kV isolation disconnecting link 6, a first 220kV circuit breaker 7, a third 220kV isolation disconnecting link 8, a fourth 220kV isolation disconnecting link 9 and a first 220kV circuit 10 in sequence, and the low-voltage winding triangle side of the first three-winding transformer 4 is connected with a first 6kV bus 12 through a first 6kV switch 11.
In this embodiment, the rated power of the first hydro-generator 1 is 200MW, the rated rotation speed is 180r/min, and the rated working pressure of the speed regulator of the first hydro-generator is 3.6 Mpa.
In this embodiment, the system further includes a second hydro-generator 13, a second 10kV circuit breaker 14, a second 10kV isolation switch 15, a second three-winding transformer 16, a fifth 220kV isolation switch 17, a sixth 220kV isolation switch 18, a second 220kV circuit breaker 19, a seventh 220kV isolation switch 20, an eighth 220kV isolation switch 21, a second 220kV line 22, a second 6kV switch 23, and a second 6kV bus 24; the second water turbine generator 13 is connected with the star-shaped side of the low-voltage winding of the second three-winding transformer 16 through a second 10kV circuit breaker 14 and a second 10kV isolation disconnecting link 15, the triangular side of the high-voltage winding of the second three-winding transformer 16 is sequentially connected with a second 220kV isolation disconnecting link 17, a sixth 220kV isolation disconnecting link 18, a second 220kV circuit breaker 19, a seventh 220kV isolation disconnecting link 20, an eighth 220kV isolation disconnecting link 21 and a second 220kV circuit 22, and the triangular side of the low-voltage winding of the second three-winding transformer 16 is connected with a second 6kV bus 24 through a second 6kV switch 23.
In this embodiment, the device further comprises a 6kV interconnection switch 25, a ninth 220kV isolation switch 26, a third 220kV circuit breaker 27, a tenth 220kV isolation switch 28, an eleventh 220kV isolation switch 29, a fourth 220kV circuit breaker 30 and a twelfth 220kV isolation switch 31; one end of the 6kV interconnection switch 25 is connected with the first 6kV bus 12, the other end is connected with the second 6kV bus 24, after the ninth 220kV isolation disconnecting link 26, the third 220kV circuit breaker 27 and the tenth 220kV isolation disconnecting link 28 are connected in series, one end is connected with a common point of the first 220kV isolation disconnecting link 5 and the second 220kV isolation disconnecting link 6, and the other end is connected with a common point of the fifth 220kV isolation disconnecting link 17 and the sixth 220kV isolation disconnecting link 18; and after the eleventh 220kV isolating disconnecting link 29, the fourth 220kV breaker 30 and the twelfth 220kV isolating disconnecting link 31 are connected in series, one end of the eleventh 220kV isolating disconnecting link is connected with a common point of the third 220kV isolating disconnecting link 8 and the fourth 220kV isolating disconnecting link 9, and the other end of the eleventh 220kV isolating disconnecting link is connected with a common point of the seventh 220kV isolating disconnecting link 20 and the eighth 220kV isolating disconnecting link 21.
In this embodiment, the first 220kV disconnecting link 5, the second 220kV disconnecting link 6, the first 220kV breaker 7, the third 220kV disconnecting link 8, the fourth 220kV disconnecting link 9, the fifth 220kV disconnecting link 17, the sixth 220kV disconnecting link 18, the second 220kV breaker 19, the seventh 220kV disconnecting link 20, the eighth 220kV disconnecting link 21, the ninth 220kV disconnecting link 26, the third 220kV breaker 27, the tenth 220kV disconnecting link 28, the eleventh 220kV disconnecting link 29, the fourth 220kV breaker 30, and the twelfth 220kV disconnecting link 31 constitute an inner bridge and an outer bridge connection.
In this embodiment, as shown in fig. 2, before the first hydro-generator 1 with the first three-winding transformer 4 and the first 220kV line 10 is started, the first 10kV isolation switch 3, the first 220kV isolation switch 5, the second 220kV isolation switch 6, the third 220kV isolation switch 8, the fourth 220kV isolation switch 9, the second 10kV circuit breaker 14, the second 10kV isolation switch 15, the fifth 220kV isolation switch 17, the sixth 220kV isolation switch 18, the second 220kV circuit breaker 19, the seventh 220kV isolation switch 20, the eighth 220kV isolation switch 21, the second 6kV switch 23, and the 6kV interconnection switch 25 are all in a closed state, and the first 10kV circuit breaker 2, the first 220kV circuit breaker 7, the first 6kV switch 11, the ninth 220kV isolation switch 26, the third 220kV circuit breaker 27, the tenth 220kV isolation switch 28, the eleventh 220kV isolation switch 29, the fourth 220kV circuit breaker 30 kV circuit breaker, The twelfth 220kV isolation disconnecting link 31 is in an off state; the first hydraulic generator 1, the first three-winding transformer 4 and the first 220kV line 10 are in a power failure state, the second hydraulic generator 13, the second three-winding transformer 16, the second 220kV line 22 and the second 6kV bus 24 are in a charged state, and the first 6kV bus 12 is in power supply connection with the second 6kV bus 24.
In this embodiment, when the first hydraulic generator 1 resumes supplying power to the first 6kV bus 12, the first hydraulic generator 1 builds voltage to a rated voltage, the 6kV interconnection switch 25 is in an open state, and the first 10kV circuit breaker 2 and the first 6kV switch 11 are in a closed state.
In this embodiment, as shown in fig. 3, when the first hydraulic generator 1 recovers to supply power to the first 6kV bus 12, the first hydraulic generator 1 is started up to a rated rotation speed from energy storage by using the speed regulator oil pressure system, and further, the terminal voltage is built up to a rated voltage, the 6kV interconnection switch 25 is firstly opened, and then the first 10kV circuit breaker 2 and the first 6kV switch 11 are closed, so that the first hydraulic generator 1 operates with the first 6kV bus 12 as a service.
In this embodiment, as shown in fig. 4, when the first hydro-generator 1 is charged with the first three-winding transformer 4 and the first 220kV line 10, the first 220kV circuit breaker 7 is in a closed state, and voltages at two ends of the first 220kV line 10 are both rated voltages.
In this embodiment, the rated voltage of the first hydraulic generator 1 and the rated voltage of the second hydraulic generator 13 are 10.5kV, and the rated voltage of three sides of the first three-winding transformer 4 and the third three-winding transformer 16 are both 242kV/10.5kV/6.3 kV.
The invention discloses a black start method of a 220kV voltage-class internal and external bridge connection non-high-voltage factory substation, which comprises the following steps of:
1) when the transformer 4 with the first three windings and the first 220kV line 10 of the first hydraulic generator 1 are started in a black state, checking and confirming that the ninth 220kV isolation disconnecting link 26, the third 220kV circuit breaker 27, the tenth 220kV isolation disconnecting link 28, the eleventh 220kV isolation disconnecting link 29 and the fourth 220kV circuit breaker 30 are all in an off state, and entering the step 2);
2) disconnecting the 6kV interconnection switch 25, detecting a power failure state of the first 6kV bus 12, detecting a shutdown state of the first hydraulic generator 1, and enabling the first three-winding transformer 4 and the first 220kV line 10 to be in a power failure state, and entering the step 3);
3) closing the first 10kV isolation disconnecting link 3, the first 220kV isolation disconnecting link 5, the second 220kV isolation disconnecting link 6, the third 220kV isolation disconnecting link 8 and the fourth 220kV isolation disconnecting link 9 in sequence, and entering the step 4);
4) starting up to a rated rotating speed by using the oil pressure of a speed regulator oil pressure system of the first hydraulic generator 1, operating an excitation system to build the voltage of the first hydraulic generator 1 to the rated voltage, closing the first 10kV circuit breaker 2, and entering the step 5);
5) closing a first 6kV switch 11, recovering power supply of a first 6kV bus 12, and entering the step 6);
6) closing a first 220kV circuit breaker 7, charging a first 220kV line 10 by the first hydraulic generator 1, and entering the step 7);
7) and checking that the voltage phase sequence of the current side and the opposite side of the first 220kV line 10 is correct, indicating that the voltage phase sequence is the rated voltage, and finishing the black start of the first hydraulic generator 1 with the first three-winding transformer 4 and the first 220kV line 10.
The invention discloses a black start system of a 220kV voltage class internal and external bridge connection non-high-voltage factory transformer substation, which comprises a first hydraulic generator, a first 10kV circuit breaker, a first 10kV isolation disconnecting link, a first three-winding transformer, a first 220kV isolation disconnecting link, a second 220kV isolation disconnecting link, a first 220kV circuit breaker, a third 220kV isolation disconnecting link, a fourth 220kV isolation disconnecting link, a first 220kV circuit, a first 6kV switch and a first 6kV bus; according to the system, a first hydraulic generator utilizes a self-energy-storage of an oil pressure system of a self-speed regulator, a guide vane is opened and adjusted to a rated rotating speed, an excitation system is operated to enable a generator terminal voltage to build up to a rated voltage, a first 10kV circuit breaker and a first 6kV switch are closed, the characteristic of a first three-winding transformer is fully utilized, the first 6kV bus power supply is recovered in time when the system is used as a boosting transformer and a service transformer, the first hydraulic generator is enabled to stably operate in a self-service load isolated island mode, then a first 220kV circuit breaker is closed, the power supply of the first hydraulic generator is sent out to a first 220kV circuit in the first time, a higher-level transformer substation is assisted to recover the power supply, the normal operation of a power; the system is not provided with a special high-voltage station transformer, and directly uses a three-winding transformer as a main transformer and a station transformer, so that the primary system wiring is simplified, the operation step of recovering station power from black start is reduced, the investment of primary equipment is reduced, and the power supply is rapidly sent out during the black start.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A black start system of a 220kV voltage-class internal and external bridge connection without a high-voltage plant substation is characterized by comprising a first hydraulic generator (1), a first three-winding transformer (4), a first 220kV line (10) and a first 6kV bus (12);
the first hydraulic generator (1) is connected with the low-voltage winding star-shaped side of the first three-winding transformer (4) through a first 10kV circuit breaker (2), a first 10kV isolation disconnecting link (3) and the first three-winding transformer in sequence;
the triangular side of the high-voltage winding of the first three-winding transformer (4) is connected with a first 220kV circuit (10) through a first 220kV isolation disconnecting link (5), a second 220kV isolation disconnecting link (6), a first 220kV circuit breaker (7), a third 220kV isolation disconnecting link (8) and a fourth 220kV isolation disconnecting link (9) in sequence;
the low-voltage winding triangular side of the first three-winding transformer (4) is connected with a first 6kV bus (12) through a first 6kV switch (11).
2. The black start system of the 220kV voltage-class internal and external bridge connection high-voltage plant-less substation, according to claim 1, further comprising a second hydro-generator (13), a second 220kV line (22) and a second 6kV bus (24);
the second hydro-generator (13) is connected with the low-voltage winding star side of a second three-winding transformer (16) through a second 10kV circuit breaker (14) and a second 10kV isolation disconnecting link (15);
the triangular side of the high-voltage winding of the second three-winding transformer (16) is connected with a second 220kV circuit (22) through a fifth 220kV isolation disconnecting link (17), a sixth 220kV isolation disconnecting link (18), a second 220kV circuit breaker (19), a seventh 220kV isolation disconnecting link (20) and an eighth 220kV isolation disconnecting link (21) in sequence;
and the low-voltage winding triangular side of the second three-winding transformer (16) is connected with a second 6kV bus (24) through a second 6kV switch (23).
3. The black start system for the 220kV voltage-class internal and external bridge connection non-high-voltage-factory substation according to claim 1, further comprising a 6kV interconnection switch (25), a ninth 220kV isolation switch (26), a third 220kV breaker (27), a tenth 220kV isolation switch (28), an eleventh 220kV isolation switch (29), a fourth 220kV breaker (30) and a twelfth 220kV isolation switch (31);
one end of the 6kV interconnection switch (25) is connected with the first 6kV bus (12), and the other end of the 6kV interconnection switch is connected with the second 6kV bus (24);
the ninth 220kV isolation disconnecting link (26), the third 220kV circuit breaker (27) and the tenth 220kV isolation disconnecting link (28) are connected in series, one end of the ninth 220kV isolation disconnecting link (26) is connected with a common point where the first 220kV isolation disconnecting link (5) and the second 220kV isolation disconnecting link (6) are connected, and one end of the tenth 220kV isolation disconnecting link (28) is connected with a common point where the fifth 220kV isolation disconnecting link (17) and the sixth 220kV isolation disconnecting link (18) are connected;
the eleventh 220kV isolation disconnecting link (29), the fourth 220kV circuit breaker (30) and the twelfth 220kV isolation disconnecting link (31) are connected in series, one end of the eleventh 220kV isolation disconnecting link (29) is connected with a common point where the third 220kV isolation disconnecting link (8) and the fourth 220kV isolation disconnecting link (9) are connected, and one end of the twelfth 220kV isolation disconnecting link (31) is connected with a common point where the seventh 220kV isolation disconnecting link (20) and the eighth 220kV isolation disconnecting link (21) are connected.
4. The black start system of the 220kV voltage-class internal and external bridge connection of the transformer substation without the high factory voltage according to claim 1, wherein before the black start of the first hydraulic generator (1) with the first three-winding transformer (4) and the first 220kV line (10), the first 10kV isolation disconnecting link (3), the first 220kV isolation disconnecting link (5), the second 220kV isolation disconnecting link (6), the third 220kV isolation disconnecting link (8), the fourth 220kV isolation disconnecting link (9), the second 10kV circuit breaker (14), the second 10kV isolation disconnecting link (15), the fifth 220kV isolation disconnecting link (17), the sixth 220kV isolation disconnecting link (18), the second 220kV circuit breaker (19), the seventh 220kV isolation disconnecting link (20), the eighth 220kV isolation disconnecting link (21), the second 6kV switch (23) and the 6kV interconnection switch (25) are all in a closed state, and the first 10kV circuit breaker (2) and the third circuit breaker (10) are in a closed state, The first 220kV circuit breaker (7), the first 6kV switch (11), the ninth 220kV isolation disconnecting link (26), the third 220kV circuit breaker (27), the tenth 220kV isolation disconnecting link (28), the eleventh 220kV isolation disconnecting link (29), the fourth 220kV circuit breaker (30) and the twelfth 220kV isolation disconnecting link (31) are all in an off state; the first hydraulic generator (1), the first three-winding transformer (4) and the first 220kV line (10) are in a power failure state, the second hydraulic generator (13), the second three-winding transformer (16), the second 220kV line (22) and the second 6kV bus (24) are in a charged state, and the first 6kV bus (12) is in power supply connection with the second 6kV bus (24).
5. The black start system of the 220kV voltage-class internal and external bridge connection high-voltage factory transformer substation is characterized in that when the first hydraulic generator (1) recovers to supply power to the first 6kV bus (12), the first hydraulic generator (1) is pressurized to a rated voltage, the 6kV interconnection switch (25) is in an open state, and the first 10kV circuit breaker (2) and the first 6kV switch (11) are in a closed state.
6. The black start system of the 220kV voltage-class internal and external bridge connection high-plant-voltage-class substation without the transformer station is characterized in that when the first hydraulic generator (1) recovers to supply power to the first 6kV bus (12), the first hydraulic generator (1) is started to a rated rotating speed from energy storage by using a speed regulator oil pressure system, further, the generator end builds up voltage to the rated voltage, the 6kV interconnection switch (25) is firstly disconnected, and then the first 10kV circuit breaker (2) and the first 6kV switch (11) are closed, so that the first hydraulic generator (1) is operated by the factory power with the first 6kV bus (12).
7. The black start system of the 220kV voltage-class internal and external bridge connection high-plant-level substation without the transformer, which is characterized in that when the first hydro-generator (1) is charged with the first three-winding transformer (4) and the first 220kV line (10), the first 220kV circuit breaker (7) is in a closed state, and the voltages at two ends of the first 220kV line (10) are rated voltages.
8. The black start system for the 220kV voltage-class internal and external bridge connection high-plant-less substation, according to claim 1, is characterized in that the rated voltage of the first hydro-generator (1) and the rated voltage of the second hydro-generator (13) are 10.5kV, and the rated voltage of the first three-winding transformer (4) and the rated voltage of the second three-winding transformer (16) are 242kV/10.5kV/6.3kV on three sides.
9. A black start method for a 220kV voltage-class internal and external bridge connection non-high-voltage factory substation is characterized by comprising the following steps:
1) when the transformer (4) with the first three windings and the first 220kV line (10) of the first hydraulic generator (1) are started in a black mode, checking and confirming that the ninth 220kV isolation disconnecting link (26), the third 220kV circuit breaker (27), the tenth 220kV isolation disconnecting link (28), the eleventh 220kV isolation disconnecting link (29) and the fourth 220kV circuit breaker (30) are all in an off state, and entering the step 2);
2) disconnecting the 6kV interconnection switch (25), detecting a power failure state of the first 6kV bus (12), detecting a shutdown state of the first hydraulic generator (1), and entering a step 3, wherein the first three-winding transformer (4) and the first 220kV line (10) are in a power failure state;
3) closing the first 10kV isolation disconnecting link (3), the first 220kV isolation disconnecting link (5), the second 220kV isolation disconnecting link (6), the third 220kV isolation disconnecting link (8) and the fourth 220kV isolation disconnecting link (9) in sequence, and entering the step 4;
4) starting up to a rated rotating speed by using the oil pressure of a speed regulator oil pressure system of the first hydraulic generator (1), operating an excitation system to build the voltage of the first hydraulic generator (1) to a rated voltage, closing the first 10kV circuit breaker (2), and entering the step 5);
5) closing a first 6kV switch (11), and enabling the first 6kV bus (12) to recover power supply to enter the step 6);
6) closing a first 220kV circuit breaker (7), charging a first 220kV line (10) by the first water wheel generator (1), and entering the step 7);
7) and (3) checking that the voltage phase sequence of the current side and the opposite side of the first 220kV line (10) is correct, indicating that the voltage phase sequence is the rated voltage, and finishing the black start of the first hydraulic generator (1) with the first three-winding transformer (4) and the first 220kV line (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306651.5A CN112311012A (en) | 2020-11-19 | 2020-11-19 | Black start system and method for 220kV voltage-class internal and external bridge connection non-high-rise factory substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306651.5A CN112311012A (en) | 2020-11-19 | 2020-11-19 | Black start system and method for 220kV voltage-class internal and external bridge connection non-high-rise factory substation |
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| CN112311012A true CN112311012A (en) | 2021-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498313A (en) * | 2022-02-09 | 2022-05-13 | 广东韶钢松山股份有限公司 | Flexible connecting bus bridge and switch cabinet transitional connection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498313A (en) * | 2022-02-09 | 2022-05-13 | 广东韶钢松山股份有限公司 | Flexible connecting bus bridge and switch cabinet transitional connection method |
| CN114498313B (en) * | 2022-02-09 | 2023-02-03 | 广东韶钢松山股份有限公司 | Flexible connecting bus bridge and switch cabinet transitional connection method |
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