Black-start power system of direct-current inverter power supply unit

Abstract

The utility model provides a black-start power system of a direct current inverter power supply unit, which comprises a direct current energy storage device, a direct current power supply output by the direct current energy storage device is inverted by a rectification inverter and then outputs an alternating current power supply, and the alternating current power supply is connected to a unit self-power system. The unit self-powered system is used for supplying power to unit accessory equipment and starting the unit accessory equipment in sequence to enable the generator transformer and the generator unit to run in a no-load mode, and the generator unit supplies power to the station service system through the high-voltage station service transformer. A direct-current power supply output by a direct-current energy storage device of the direct-current power supply system is inverted by a rectification inverter and then outputs an alternating-current V power supply, and then the alternating-current V power supply is connected to a unit self-powered system through a standby power supply incoming line loop, supplies power to unit accessory equipment and starts the unit accessory equipment in sequence. And the switching operation time is shortened, the operation risk is reduced, and rapid black start of the unit is realized, so that the plant flooding accident can be avoided, and the rapid recovery of the system accident is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power station safety, in particular to a black start power system of a DC inverter power supply unit. Background Art

[0002] For hydropower stations that use diesel generator sets for security power supply, the existing black start method is generally that when the power supply of the entire power station disappears, the operating personnel are required to manually start the diesel generator set, switch the relevant circuit breakers of the power supply system, and restore the 0.4kV self-use power system corresponding to the black start unit to supply power to the unit's ancillary equipment, and the dam power system to supply power to the flood discharge facilities.

[0003] According to the actual experience of black start operation of the unit, the operating personnel have to start the diesel generator, close the diesel generator export switch, switch the factory power switch, and manually start the unit from zero to increase the voltage. The whole process takes a long time and has extremely high safety risks such as asynchronous operation, reverse charging, and wrong interval. Summary of the Invention

[0004] The utility model provides a black start power system for a DC inverter power supply unit. The DC power output by the DC energy storage device of the DC power supply system is inverted by a rectifier inverter to output an AC 400V power supply, which is then connected to the unit's own power system through a backup power supply incoming line circuit, and then supplies power to the unit's auxiliary equipment and starts the unit's auxiliary equipment in sequence.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A black start power system for a DC inverter power supply unit includes a DC energy storage device. The DC power output by the DC energy storage device is inverted by a rectifier inverter to output AC power. The AC power is connected to the unit's self-use power system. The unit's self-use power system is used to supply power to the unit's auxiliary equipment and start the unit's auxiliary equipment in sequence so that the generator transformer and the generator unit run at no load. The generator unit supplies power to the plant power system through a high-voltage plant transformer.

[0007] The above-mentioned auxiliary power system supplies power to the unit's own power system through the auxiliary power feeder loop switch, auxiliary transformer and the unit's own power incoming line switch.

[0008] A standby power supply line switch for the unit's own power is provided between the above-mentioned rectifier inverter and the unit's own power system.

[0009] The above-mentioned auxiliary equipment of the unit includes an excitation system.

[0010] The above generator set is connected to the generator transformer through a GCB circuit breaker.

[0011] The above-mentioned auxiliary power system is provided with multiple busbar sections connected to different multiple generator sets.

[0012] The above-mentioned unit's self-use power system is equipped with two busbars, which are connected by a tie switch. The two busbars are respectively connected to different busbars of the plant power system through the unit's self-use power incoming line switch, the plant transformer and the plant power feeder loop switch.

[0013] A connecting switch is provided between adjacent busbars of the above-mentioned auxiliary power system, and a system feed switch is provided on the busbar of the auxiliary power system.

[0014] A locking connection is provided between the above-mentioned unit's own power backup power incoming line switch and the unit's own power incoming line switch.

[0015] This utility model provides a DC inverter power supply unit black-start power system. The DC power output from the DC energy storage device of the DC power supply system is inverted by a rectifier inverter to output 400V AC power. This power is then connected to the unit's own power system through a backup power supply line circuit. The system then supplies power to the unit's auxiliary equipment and starts them sequentially. This reduces switching operation time and operational risks, enabling rapid black-start of the unit, thereby preventing flooding accidents and facilitating rapid recovery from system accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples:

[0017] Figure 1 This is the electrical schematic diagram of the utility model system.

[0018] Among them: DC energy storage equipment 1, rectifier inverter 2, unit self-use backup power supply incoming line switch 3, unit self-use power system 4, unit self-use power incoming line switch 5, plant transformer 6, plant power feeder loop switch 7, system feeder switch 8, plant power system 9, high-voltage plant transformer 10, generator transformer 11, GCB circuit breaker 12, generator unit 13, excitation system 14. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following content will systematically and completely describe the specific technical solutions of the present invention in combination with the drawings provided according to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] like Figure 1As shown in the figure, a black start power system for a DC inverter power supply unit includes a DC energy storage device 1. The DC power output by the DC energy storage device 1 is inverted by a rectifier inverter 2 and then output as AC power. The AC power is connected to the unit's self-use power system 4. The unit's self-use power system 4 is used to supply power to the unit's auxiliary equipment and start the unit's auxiliary equipment in sequence so that the generator transformer 11 and the generator unit 13 run at no load. The generator unit 13 supplies power to the plant power system 9 through the high-voltage plant transformer 10.

[0021] The above-mentioned auxiliary power system 9 supplies power to the unit's own power system 4 via the auxiliary power feeder loop switch 7, the auxiliary transformer 6 and the unit's own power incoming line switch 5.

[0022] A standby power supply incoming line switch 3 for the unit's own power is provided between the rectifier inverter 2 and the unit's own power system 4 .

[0023] The auxiliary equipment of the above-mentioned unit includes an excitation system 14 .

[0024] The generator set 13 is connected to the generator transformer 11 via a GCB circuit breaker 12 .

[0025] The above-mentioned auxiliary power system 9 is provided with multiple busbars connected to different multiple generator sets 13 .

[0026] The above-mentioned unit self-use power system 4 is provided with two busbar sections, which are connected by a tie switch. The two busbar sections are respectively connected to different busbars of the plant power system 9 through the unit self-use power incoming line switch 5, the plant transformer 6 and the plant power feeder loop switch 7.

[0027] A connecting switch is provided between adjacent busbars of the above-mentioned auxiliary power system 9 , and a system feed switch 8 is provided on the busbar of the auxiliary power system 9 .

[0028] A locking connection is provided between the above-mentioned unit's own power backup power incoming line switch 3 and the unit's own power incoming line switch 5.

[0029] Example:

[0030] A DC inverter power supply unit black-start power system and method is configured with a DC energy storage device 1 for the unit black-start. The DC power output by the DC energy storage device 1 is inverted by a rectifier inverter 2 to output an AC 400V power supply, which is then connected to the unit's self-use power system 4 through a backup power supply incoming line loop 3. The power is then supplied to the unit's auxiliary equipment and started in sequence. The generator sets 11 and 13 operate at no load. The generator set 13 supplies power to a 10kV plant power system 9 through a high-voltage plant transformer 10. The 10kV plant power system 9 supplies power to the unit's self-use power system 4 through a 10kV feeder loop 7, a plant transformer 6, and a unit's self-use power incoming line switch 5, thereby achieving independent operation of the unit 13.

[0031] In order to avoid asynchronous closing between the unit's own power supply and the power battery power supply, a corresponding locking connection needs to be added between the unit's own power backup power supply incoming switch 3 and the unit's own power incoming switch 5.

[0032] The black start DC energy storage device 1 selected in the present invention can be a battery or capacitor energy storage device, depending on the ventilation and firefighting equipment configuration and space available at the project site. The rated voltage and capacity of the DC energy storage device 1 can be reduced based on the actual load current of the project to facilitate design based on different requirements.

[0033] The present invention starts the auxiliary equipment of the unit in the following order: start the unit water supply system, start the unit cooling system, start the high-pressure oil lifting device, start the speed control system, withdraw the high-pressure oil lifting device, close the GCB12, start the excitation system 14, the generator and transformer groups 11 and 13 run at no load, and perform the plant power switching operation. The unit 13 carries the plant power, and the black start of the unit 13 is completed.

[0034] In order to adapt to the different configurations of auxiliary equipment of each engineering unit, the startup sequence of the unit's auxiliary equipment can be adjusted accordingly to meet the actual situation of the unit's black start.

Claims

1. A DC inverter power supply unit black start power system, characterized in that: The invention comprises a DC energy storage device (1), wherein the DC power outputted by the DC energy storage device (1) is inverted by a rectifier inverter (2) and then outputted as AC power, and the AC power is connected to the unit's self-use power system (4), and the unit's self-use power system (4) is used to supply power to the unit's auxiliary equipment and start the unit's auxiliary equipment in sequence so that the generator transformer (11) and the generator unit (13) run at no load, and the generator unit (13) supplies power to the plant power system (9) through the high-voltage plant transformer (10).

2. A DC inverter power supply unit black start power system according to claim 1, characterized in that: The plant power system (9) supplies power to the unit's own power system (4) via the plant power feeder circuit switch (7), the plant transformer (6) and the unit's own power incoming line switch (5).

3. A DC inverter power supply unit black start power system according to claim 2, characterized in that: A standby power supply line switch (3) for the unit's own power is provided between the rectifier inverter (2) and the unit's own power system (4).

4. A DC inverter power supply unit black start power system according to claim 3, characterized in that: The auxiliary equipment of the unit includes an excitation system (14).

5. A DC inverter power supply unit black start power system according to claim 4, characterized in that: The generator set (13) is connected to the generator transformer (11) via a GCB circuit breaker (12).

6. A DC inverter power supply unit black start power system according to claim 5, characterized in that: The plant power system (9) is provided with multiple busbars connected to different multiple generator sets (13).

7. A DC inverter power supply black start power system according to claim 6, characterized in that: The unit's own power system (4) is provided with two busbar sections, which are connected via a tie switch. The two busbar sections are connected to different busbars of the plant power system (9) via the unit's own power incoming line switch (5), the plant transformer (6) and the plant power feeder loop switch (7).

8. A DC inverter power supply black start power system according to claim 7, characterized in that: A connecting switch is provided between adjacent busbars of the plant power system (9), and a system feed switch (8) is provided on the busbar of the plant power system (9).

9. A DC inverter power supply black start power system according to claim 8, characterized in that: A locking connection is provided between the unit's own standby power supply incoming line switch (3) and the unit's own power incoming line switch (5).

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