Multi-unit nuclear power plant power supply system

Abstract

The utility model discloses a multi-unit nuclear power plant power supply system. The system comprises at least one unit module, a first diesel engine power supply bus and a second diesel engine power supply bus, each unit module comprises a first medium-voltage bus, a second medium-voltage bus, a main generator, a main transformer, a first high-voltage bus, a second high-voltage bus, a first station transformer, a second station transformer, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a first standby transformer, a second standby transformer, a first diesel generator, a second diesel generator, a first contact switch and a second contact switch. The first and second high-voltage buses are respectively connected with the first and second medium-voltage buses through the first and second station transformers and the first and third switches; the first and second high-voltage buses are connected with the first and second medium-voltage buses through the first and second standby transformers and the third and fourth switches; the first and second medium-voltage buses are respectively connected with the first and second diesel generators through fifth and sixth switches; the first power supply bus and the second power supply bus of the diesel engine connect the first medium-voltage bus and the second medium-voltage bus in each unit module through the first contact switch and the second contact switch in each unit module.

Description

Technical Field

[0001] An embodiment of the utility model relates to the field of nuclear power technology, and particularly to a power supply system for a multi-unit nuclear power plant. Background Art

[0002] Each unit of a nuclear power plant is usually equipped with a main AC power supply system to supply power to the plant loads. The normal power source of the main AC power supply system comes from each main generator. The power generated by each main generator is transmitted to the medium-voltage bus through the auxiliary transformer to supply power to the plant loads. When each main generator is unavailable, the 500 kV power source outside the plant is reverse-fed to the medium-voltage bus through the 500 kV switchyard, the main transformer and the auxiliary transformer to supply power to the plant loads. If for various reasons the 500 kV power source outside the plant cannot be reverse-fed through the 500 kV switchyard, the 220 kV power source outside the plant will be reverse-fed to the medium-voltage bus through the 220 kV switchyard and the standby transformer to supply power to the plant loads. If each main generator, the 500 kV power source outside the plant, and the 220 kV power source outside the plant are all unavailable, each unit of the nuclear power plant is also equipped with two diesel generators. Each diesel generator will start, and each diesel generator is responsible for supplying power to one medium-voltage bus in each unit. The two diesel generators are responsible for supplying power to each unit. In this way, each diesel generator can ensure that the nuclear power plant facilities do not completely rely on the power source outside the plant, and provide further defense depth for the nuclear power plant when the power source outside the plant is lost and improve the economy of the operation of the nuclear power plant.

[0003] However, in the case of the failure of any one of the diesel generators in a certain unit, the start-up risk of the nuclear power plant under the design basis conditions will increase, and at the same time, the probability of damage to high-value plant electrical equipment will also increase greatly. Therefore, how to improve the power supply reliability of the diesel generator system of the nuclear power plant has become a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0004] The utility model provides a power supply system for a multi-unit nuclear power plant to improve the power supply reliability of the power supply system of the nuclear power plant in the case of the failure of any one of the diesel generators in a certain unit.

[0005] To achieve the above object, an embodiment of the utility model provides a power supply system for a multi-unit nuclear power plant, which system includes: at least one unit module, a first diesel power supply bus and a second diesel power supply bus; each of the unit modules includes a first medium-voltage bus, a second medium-voltage bus, a main generator, a main transformer, a first high-voltage bus, a second high-voltage bus, a first auxiliary transformer, a second auxiliary transformer, a first switch, a second switch, a first standby transformer, a second standby transformer, a third switch, a fourth switch, a first diesel generator, a second diesel generator, a fifth switch, a sixth switch, a first contact switch and a second contact switch;

[0006] The main generator is connected to the first high-voltage bus; the main transformer is connected to the first high-voltage bus; the first high-voltage bus is connected to the first medium-voltage bus through the first auxiliary transformer and the first switch; the first high-voltage bus is connected to the second medium-voltage bus through the second auxiliary transformer and the second switch; the second high-voltage bus is connected to the first medium-voltage bus through the first standby transformer and the third switch; the second high-voltage bus is connected to the second medium-voltage bus through the second standby transformer and the fourth switch; the first medium-voltage bus is connected to the first diesel generator through the fifth switch; the second medium-voltage bus is connected to the second diesel generator through the sixth switch;

[0007] The first power supply bus of the diesel engine connects the first medium-voltage buses in each of the unit modules through each of the first contact switches in each of the unit modules;

[0008] The second power supply bus of the diesel engine connects the second medium-voltage buses in each of the unit modules through each of the second contact switches in each of the unit modules.

[0009] Optionally, the system further includes: a first standby diesel engine, a third contact switch, and a fourth contact switch;

[0010] The first standby diesel engine is connected to the first power supply bus of the diesel engine through the third contact switch;

[0011] The first standby diesel engine is connected to the second power supply bus of the diesel engine through the fourth contact switch.

[0012] Optionally, the first power supply bus of the diesel engine and the second power supply bus of the diesel engine share a diesel engine power supply bus;

[0013] The diesel engine power supply bus connects the first medium-voltage buses in each of the unit modules through each of the first contact switches in each of the unit modules;

[0014] The diesel engine power supply bus connects the second medium-voltage buses in each of the unit modules through each of the second contact switches in each of the unit modules;

[0015] The third contact switch and the fourth contact switch share a fifth contact switch; the first standby diesel engine is connected to the diesel engine power supply bus through the fifth contact switch.

[0016] Optionally, the system further includes: a second standby diesel engine, a third standby diesel engine, a sixth contact switch, and a seventh contact switch;

[0017] The second standby diesel engine is connected to the first power supply bus of the diesel engine through the sixth contact switch;

[0018] The third standby diesel engine is connected to the second power supply bus of the diesel engine through the seventh contact switch.

[0019] Optionally, each of the unit modules further includes: a first controller, a second controller, and a master controller;

[0020] The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch;

[0021] The master controller is electrically connected to each of the first contact switches and the second contact switches.

[0022] Optionally, the system further includes: a first low-voltage relay and a second low-voltage relay;

[0023] The first low-voltage relay is connected to the first medium-voltage bus; the second low-voltage relay is connected to the second medium-voltage bus.

[0024] Optionally, each of the unit modules further includes: a first controller, a second controller, and a master controller;

[0025] The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch;

[0026] The master controller is electrically connected to each of the third contact switches and the fourth contact switches; the master controller is connected to the first standby diesel engine.

[0027] Optionally, the master controller is further connected to the fifth contact switch.

[0028] Optionally, each of the unit modules further includes: a first controller, a second controller, and a master controller;

[0029] The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch;

[0030] The master controller is electrically connected to the second standby diesel engine, the third standby diesel engine, the sixth contact switch, and the seventh contact switch.

[0031] In the embodiment of the present invention, since the first power supply bus of the diesel engine connects the first medium-voltage buses in each of the unit modules through the first contact switches in each of the unit modules; the second power supply bus of the diesel engine connects the second medium-voltage buses in each of the unit modules through the second contact switches in each of the unit modules, any one of the first diesel generators in other units can be started in this way, the first contact switches in other units are closed, the first contact switch of this unit is closed, and any one of the first diesel generators in other units supplies power to the first medium-voltage bus of this unit through the first power supply bus of the diesel engine; thus ensuring that any one of the two diesel generators in a certain unit fails to start, resulting in no power in any one of the medium-voltage buses, and improving the power supply reliability of the diesel generator system in the nuclear power plant. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0033] Figure 2 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0034] Figure 3 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0035] Figure 4 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0036] Figure 5 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0037] Figure 6 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0038] Figure 7 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention;

[0039] Figure 8 It is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention. Detailed Embodiments

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0041] Figure 1 is a schematic structural diagram of a multi-unit nuclear power plant power supply system provided by the present invention; as Figure 1 shown, the system includes: at least one unit module 10, a first diesel power supply bus L1 and a second diesel power supply bus L2; each unit module 10 includes a first medium-voltage bus IES1, a second medium-voltage bus IES2, a main generator 1G, a main transformer 1MT, a first high-voltage bus 1A, a second high-voltage bus 1B, a first auxiliary transformer 1STA, a second auxiliary transformer 1STB, a first switch 11, a second switch 12, a first standby transformer 1ATA, a second standby transformer 1ATB, a third switch 13, a fourth switch 14, a first diesel generator 1MGA, a second diesel generator 1MGB, a fifth switch 15, a sixth switch 16, a first contact switch 21 and a second contact switch 22;

[0042] The main generator 1G is connected to the first high-voltage bus 1A; the main transformer 1MT is connected to the first high-voltage bus 1A; the first high-voltage bus 1A is connected to the first medium-voltage bus IES1 through the first auxiliary transformer 1STA and the first switch 11; the second high-voltage bus 1B is connected to the second medium-voltage bus IES2 through the second auxiliary transformer 1STB and the second switch 12; the second high-voltage bus 1B is connected to the first medium-voltage bus IES1 through the first standby transformer 1ATA and the third switch 13; the second high-voltage bus 1B is connected to the second medium-voltage bus IES2 through the second standby transformer 1ATB and the fourth switch 14; the first medium-voltage bus IES1 is connected to the first diesel generator 1MGA through the fifth switch 15; the second medium-voltage bus IES2 is connected to the second diesel generator 1MGB through the sixth switch 16;

[0043] The first diesel power supply bus L1 connects the first medium-voltage buses IES1 in each unit module through the first contact switches 21 in each unit module;

[0044] The second diesel power supply bus L2 connects the second medium-voltage buses IES2 in each unit module through the second contact switches 22 in each unit module.

[0045] Among them, the normal operation modes of the power supply system of a multi-unit nuclear power plant may include: The first mode is that the main generators 1G in each unit module 10 operate. The main generators 1G supply power to the first medium-voltage bus IES1 through the first auxiliary transformer 1STA and the first switch 11. The first medium-voltage bus IES1 supplies power to some auxiliary loads. It supplies power to the second medium-voltage bus IES2 through the second auxiliary transformer 1STB and the second switch 12. The second medium-voltage bus IES2 supplies power to other auxiliary loads. The second mode is that the off-site 500 kV power supply passes through the 500 kV switchyard and supplies power to the first medium-voltage bus IES1 through the main transformer 1MT of each unit module, the first auxiliary transformer 1STA, and the first switch 11. The first medium-voltage bus IES1 supplies power to some auxiliary loads. And it supplies power to the second medium-voltage bus IES2 through the main transformer 1MT, the second auxiliary transformer 1STB, and the second switch 12. The second medium-voltage bus IES2 supplies power to other auxiliary loads. The third mode is that the off-site 200 kV power supply passes through the 200 kV switchyard and supplies power to the first medium-voltage bus IES1 through the first standby transformer 1ATA and the third switch 13. The first medium-voltage bus IES1 supplies power to some auxiliary loads. And when it supplies power to the second medium-voltage bus IES2 through the second standby transformer 1ATB and the fourth switch 14, the second medium-voltage bus IES2 supplies power to other auxiliary loads.

[0046] When all the main generators 1G, the off-site 500 kV power supply, and the off-site 200 kV power supply fail, the first medium-voltage bus 1ES1 and the second medium-voltage bus 1ES2 in each unit module 10 have no power. Each first diesel generator 1MGA in each unit module 10 can be started, and the corresponding fifth switch 15 is controlled to close, so that the first medium-voltage bus 1ES1 in each unit module 10 has power. Each second diesel generator 1MGB is started, and the corresponding sixth switch 16 is controlled to close, so that the second medium-voltage bus 1ES2 in each unit module 10 has power. And if any one of the first diesel generators 1MGA or the second diesel generators 1MGB in a certain unit module 10 fails to start or has a starting failure, in this embodiment, since the first diesel power supply bus L1 connects the first medium-voltage bus 1ES1 in each unit module through each first contact switch 21 in each unit module; the second diesel power supply bus L2 connects the second medium-voltage bus 1ES2 in each unit module through each second contact switch 22 in each unit module. In this way, any one of the first diesel generators 1MGA in other units can be started, the first contact switch 21 in other units is closed, the first contact switch 21 in this unit is closed, and any one of the first diesel generators in other units supplies power to the first medium-voltage bus 1ES1 of this unit through the first diesel power supply bus L1. In this way, it is ensured that when any one of the above modes fails in any unit module 10, the power failure of any one of the two diesel generators that causes any one of the medium-voltage buses is avoided, and the power supply reliability of the diesel generator system of the nuclear power plant is improved.

[0047] Exemplarily, taking the case where the first diesel generator 1MGA of the first unit module fails to start or has a starting failure as an example, the first diesel generator 1MGA in the second unit module can be started, and the first contact switch 21 in the second unit module is closed. The first contact switch 21 in this unit module is closed, and the first diesel generator 1MGA in the second unit module supplies power to the first medium-voltage bus 1ES1 of this unit through the first medium-voltage bus 1ES1 in the second unit module and the first power supply bus L1 of the diesel engine;

[0048] Taking the case where the second diesel generator 1MGB of the first unit module fails to start or has a starting failure as an example, the second diesel generator 1MGB in the second unit module can be started, and the second contact switch 22 in the second unit module is closed. The second contact switch 22 in this unit module is closed, and the second diesel generator 1MGB in the second unit module supplies power to the second medium-voltage bus 1ES2 of this unit through the second medium-voltage bus 1ES2 in the second unit module and the second power supply bus L2 of the diesel engine. Of course, in this embodiment, when both the first diesel generator 1MGA and the second diesel generator 1MGB of the first unit module fail to start or have starting failures, the first diesel generator 1MGA in the second unit module and the second diesel generator 1MGB in the second unit module can be started simultaneously.

[0049] Optionally, on the basis of the above embodiment, further optimization is carried out. Figure 2 It is a schematic structural diagram of another multi-unit nuclear power plant power supply system provided by an embodiment of the present invention; as Figure 2 shown, the system further includes: a first standby diesel engine 0MGB, a third contact switch 23, and a fourth contact switch 24; the first standby diesel engine 0MGB is connected to the first power supply bus L1 of the diesel engine through the third contact switch 23; the first standby diesel engine 0MGB is connected to the second power supply bus L2 of the diesel engine through the fourth contact switch 24.

[0050] Among them, if any one of the first diesel generator 1MGA or the second diesel generator 1MGB in a certain unit module 10 fails to start or has a starting failure, here taking the case where the first diesel generator 1MGA in the first unit module fails to start or has a starting failure as an example, then the first medium-voltage busbar 1ES1 in the first unit module is de-energized. This embodiment further includes a first standby diesel engine 0MGB, a third switch 23, and a fourth switch 24. In this way, the first standby diesel engine 0MGB can still be started. At the same time, the third switch 23 is controlled to close, and the first switch 21 in the first unit module is controlled to close. In this way, the first standby diesel engine 0MGB supplies power to the first medium-voltage busbar 1ES1 in the first unit module through the first power supply busbar L1 of the diesel generator; thus, it also ensures that the first medium-voltage busbar 1ES1 is de-energized due to the failure of the first diesel generator 1MGA to start, improving the power supply reliability of the diesel generator system in the nuclear power plant.

[0051] Of course, it can be understood that when the second diesel generator 1MGB in the first unit module fails to start or has a starting failure, then the second medium-voltage busbar 1ES2 in the first unit module is de-energized. This embodiment further includes a first standby diesel engine 0MGB, a third switch 23, and a fourth switch 24. In this way, the first standby diesel engine 0MGB can still be started. At the same time, the fourth switch 24 is controlled to close, and the second switch 22 in the first unit module is controlled to close. In this way, the first standby diesel engine 0MGB supplies power to the second medium-voltage busbar 1ES2 in the first unit module through the second power supply busbar L2 of the diesel generator.

[0052] Optionally, in some embodiments, Figure 3 is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention; as Figure 3 shown, the first power supply busbar L1 of the diesel engine and the second power supply busbar L2 of the diesel engine share the power supply busbar L of the diesel engine; the power supply busbar L of the diesel engine connects the first medium-voltage busbars 1ES1 in each unit module through the first switches 21 in each unit module; the power supply busbar L of the diesel engine connects the second medium-voltage busbars 1ES2 in each unit module through the second switches 22 in each unit module; the third switch 23 and the fourth switch 24 share a fifth switch 25; the first standby diesel engine 0MGB is connected to the power supply busbar L of the diesel engine through the fifth switch 25.

[0053] Among them, if any one of the first diesel generator 1MGA or the second diesel generator 1MGB in a certain unit module 10 fails to start or has a starting failure, here taking the first diesel generator 1MGA in the first unit module failing to start or having a starting failure as an example, then the first medium-voltage bus 1ES1 in the first unit module has no power. In this embodiment, the first power supply bus L1 of the diesel engine and the second power supply bus L2 of the diesel engine share the diesel engine power supply bus L; the third contact switch 23 and the fourth contact switch 24 share the fifth contact switch 25. In this way, the first standby diesel engine 0MGB can be started, and at the same time, the fifth contact switch 25 is controlled to close, and the first contact switch 21 in the first unit module is controlled to close. In this way, the first standby diesel engine 0MGB supplies power to the first medium-voltage bus 1ES1 in the first unit module through the diesel generator power supply bus L; thus, it also ensures that the first medium-voltage bus 1ES1 has no power due to the failure to start of the first diesel generator 1MGA, improving the power supply reliability of the diesel generator system in the nuclear power plant. In addition, compared with the Figure 2 The wiring method in the scheme is simpler.

[0054] Of course, it can also be understood that when the second diesel generator 1MGB in the first unit module fails to start or has a starting failure, then the second medium-voltage bus 1ES2 in the first unit module has no power. In this embodiment, the first standby diesel engine 0MGB can also be started, and at the same time, the fifth contact switch 25 is controlled to close, and the second contact switch 22 in the first unit module is controlled to close. In this way, the first standby diesel engine 0MGB supplies power to the second medium-voltage bus 1ES2 in the first unit module through the diesel generator power supply bus L.

[0055] Optionally, in some other embodiments, Figure 4 is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention; as Figure 4 shown, the system further includes: a second standby diesel engine 0MGB, a third standby diesel engine 0MGC, a sixth contact switch 26, and a seventh contact switch 27; the second standby diesel engine 0MGB is connected to the first power supply bus L1 of the diesel engine through the sixth contact switch 26; the third standby diesel engine 0MGC is connected to the second power supply bus L2 of the diesel engine through the seventh contact switch 27.

[0056] Among them, if any one of the first diesel generator 1MGA or the second diesel generator 1MGB in a certain unit module 10 fails to start or has a starting failure, taking the first diesel generator 1MGA in the first unit module failing to start or having a starting failure as an example, the first medium-voltage busbar 1ES1 in the first unit module is de-energized. In this embodiment, it includes the second standby diesel engine 0MGB, the third standby diesel engine 0MGC, the sixth contact switch 26, and the seventh contact switch 27. In this way, the second standby diesel engine 0MGB can be started, and at the same time, the sixth contact switch 26 is controlled to close, and the first contact switch 21 in the first unit module is controlled to close. In this way, the second standby diesel engine 0MGB supplies power to the first medium-voltage busbar 1ES1 in the first unit module through the first power supply busbar L1 of the diesel engine, thus ensuring that the first medium-voltage busbar is de-energized due to the failure of the first diesel generator 1MGA to start, and improving the power supply reliability of the diesel generator system in the nuclear power plant.

[0057] When the second diesel generator 1MGB in the first unit module fails to start or has a starting failure, the second medium-voltage busbar 1ES2 in the first unit module is de-energized. In this embodiment, the third standby diesel engine 0MGC can also be started. At the same time, the seventh contact switch 27 is controlled to close, and the second contact switch 22 in the first unit module is controlled to close. In this way, the third standby diesel engine 0MGC supplies power to the second medium-voltage busbar 1ES2 in the first unit module through the second power supply busbar L2 of the diesel generator, thus ensuring that the second medium-voltage busbar 1ES2 is de-energized due to the failure of the second diesel generator 1MGA to start, and improving the power supply reliability of the diesel generator system in the nuclear power plant. In addition, when the first diesel generator 1MGA of the first unit module and the second diesel generator 1MGB of the first unit module both fail to start or have starting failures at the same time, the second standby diesel engine 0MGB, the sixth contact switch 26, the third standby diesel engine 0MGC, and the seventh contact switch 27 can be started simultaneously.

[0058] It should be noted that the starting methods of the above-mentioned first diesel generator 1MGA, second diesel generator 1MGB, first standby diesel engine 0MGA, second standby diesel engine 0MGB, and third standby diesel engine 0MGC include various methods, and this embodiment does not make specific limitations on this.

[0059] Optionally, Figure 5 is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention; as Figure 5As shown in the figure, each unit module further includes: a first controller 20, a second controller 30, and a master controller 40; the first controller 20 is connected to the first diesel generator 1MGA; the second controller 30 is connected to the second diesel generator 1MGB; the first controller 20 is connected to the first switch 11, the third switch 13, and the fifth switch 15; the second controller 30 is connected to the second switch 12, the fourth switch 14, and the sixth switch 16; the master controller 40 is electrically connected to each first contactor switch 21 and the second contact switch 22 (the connection relationship is not specifically shown in the figure).

[0060] Wherein, when each main generator 1G, the off-site 500KV power supply, and the off-site 200KV power supply all fail, and when the first medium-voltage bus 1ES1 and the second medium-voltage bus 1ES2 in each unit module 10 are both de-energized, in this embodiment, each first controller 20 can control the start of each first diesel generator 1MGA, and control the corresponding fifth switch 15 to close, while ensuring that each first switch 11 is in the open state and each third switch 13 is in the open state. In this way, each first controller 20 can ensure the rapid start of each first diesel generator 1MGA, and automatic control to save time, ensuring that each first medium-voltage bus 1ES1 has the ability to quickly carry load; at the same time, each second controller 30 can control the start of each second diesel generator 1MGB, and control the corresponding sixth switch 15 to close, while ensuring that each second switch 12 is in the open state and each fourth switch 16 is in the open state. In this way, each second controller 30 can ensure the rapid start of each second diesel generator 1MGB, and automatic control to save time, ensuring that each second medium-voltage bus 1ES2 has the ability to quickly carry load; when any one of the two diesel generators fails to start quickly, the first controller 20 or the second controller 30 in other unit modules can correspondingly quickly start the first diesel generator 1MGA, the fifth switch 15, or the second diesel generator 1MGB, the sixth switch 16, and the master controller 40 controls the corresponding contact switch to close, thereby ensuring power supply reliability.

[0061] Optionally, Figure 6 is a schematic structural diagram of another multi-unit nuclear power plant power system provided by an embodiment of the present invention; as Figure 6 shown, each unit module further includes: a first controller 20, a second controller 30, and a master controller 40; the first controller 20 is connected to the first diesel generator 1MGA; the second controller 30 is connected to the second diesel generator 1MGB; the first controller 20 is connected to the first switch 11, the third switch 13, and the fifth switch 15; the second controller 30 is connected to the second switch 12, the fourth switch 14, and the sixth switch 16; the master controller 40 is electrically connected to each third contactor switch 23 and the fourth contact switch 24; the master controller 40 is connected to the first standby diesel engine 0MGA (the connection relationship is not specifically shown in the figure).

[0062] Similarly, each first controller 20 ensures the rapid start-up of each first diesel generator 1MGA, and each second controller 30 also ensures the rapid start-up of each first diesel generator 1MGA. When the rapid start-up of either of the two diesel generators fails, the master controller 40 can quickly start the first standby diesel engine 0MGA and control the third contactor switch 23 to close, and either the second contact switch 22 or the fourth contact switch 24 to close, and the second contact switch 22 to close. In this way, the first standby diesel engine 0MGA can replace either diesel generator to supply power to the corresponding medium-voltage bus, ensuring power supply reliability.

[0063] Optionally, Figure 7 FIG. [X] is a schematic structural diagram of another multi-unit nuclear power plant power supply system provided by an embodiment of the present invention; as Figure 7 shown, each unit module further includes: a first controller 20, a second controller 30, and a master controller 40; the first controller 20 is connected to the first diesel generator 1MGA; the second controller 30 is connected to the second diesel generator 1MGB; the first controller 20 is connected to the first switch 11, the third switch 13, and the fifth switch 15; the second controller 30 is connected to the second switch 12, the fourth switch 14, and the sixth switch 16; the master controller 40 is connected to the first standby diesel engine 0MGA; the master controller 40 is further connected to the fifth contact switch 25 (the connection relationship is not specifically shown in the figure).

[0064] Similarly, each first controller 20 ensures the rapid start-up of each first diesel generator 1MGA, and each second controller 30 also ensures the rapid start-up of each first diesel generator 1MGA. When the rapid start-up of either of the two diesel generators fails, the master controller 40 can quickly start the first standby diesel engine 0MGA, close the fifth contactor switch 25 and the first contactor switch 21. In this way, the first standby diesel engine 0MGA can replace the first diesel generator to supply power to the first medium-voltage bus, ensuring power supply reliability. Of course, the master controller 40 can quickly start the first standby diesel engine 0MGA, close the fifth contactor switch 25 and the second contactor switch 22. In this way, the first standby diesel engine 0MGA can replace the second diesel generator to supply power to the first medium-voltage bus, ensuring power supply reliability.

[0065] Optionally, Figure 8 FIG. [X] is a schematic structural diagram of another multi-unit nuclear power plant power supply system provided by an embodiment of the present invention; as Figure 8As shown, each unit module further includes: a first controller 20, a second controller 30, and a master controller 40; the first controller 20 is connected to the first diesel generator 1MGA; the second controller 30 is connected to the second diesel generator 1MGB; the first controller 20 is connected to the first switch 11, the third switch 13, and the fifth switch 15; the second controller 30 is connected to the second switch 12, the fourth switch 14, and the sixth switch 16; the master controller 40 is electrically connected to the second standby diesel engine 0MGB, the third standby diesel engine 0MGC, the sixth contact switch 26, and the seventh contact switch 27 (the connection relationship is not specifically shown in the figure).

[0066] Similarly, each first controller 20 ensures the rapid start of each first diesel generator 1MGA, and each second controller 30 also ensures the rapid start of each first diesel generator 1MGA; when the rapid start of the first diesel generator among the two diesel generators fails, the master controller 40 can quickly start the second standby diesel engine 0MGB and control the sixth contact switch 26 to close, so that the second standby diesel engine 0MGB replaces the first diesel generator 1MGA to supply power to the first medium-voltage bus; or when the rapid start of the second diesel generator among the two diesel generators fails, the master controller 40 can quickly start the third standby diesel engine 0MGC and control the seventh contact switch 27 to close, so that the third standby diesel engine 0MGC replaces the second diesel generator 1MGB to supply power to the second medium-voltage bus.

[0067] Optionally, in the above Figures 5 - 8 , each power supply system further includes a first low-voltage relay and a second low-voltage relay; the first low-voltage relay is connected to the first medium-voltage bus 1ES1; the second low-voltage relay is connected to the second medium-voltage bus 1ES2. Among them, the first low-voltage relay and the second low-voltage relay can be respectively used to detect whether the first diesel generator 1MGA and the second diesel generator 1MGB start successfully. If the first diesel generator 1MGA and the second diesel generator 1MGB start successfully, the first low-voltage relay and the second low-voltage relay can respectively detect a high-voltage signal output on the corresponding medium-voltage bus. If the first diesel generator 1MGA and the second diesel generator 1MGB do not start successfully, the first low-voltage relay and the second low-voltage relay can respectively detect a low-voltage signal output on the corresponding medium-voltage bus; in this way, the two low-voltage relays can be used to detect whether the diesel generator starts successfully, improving the reliability of the power supply system.

[0068] Note that the above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, it can also include more other equivalent embodiments, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A multi-unit nuclear power plant power supply system, characterized in that, Including: At least one unit module, a first diesel power supply bus and a second diesel power supply bus; each of the unit modules includes a first medium-voltage bus, a second medium-voltage bus, a main generator, a main transformer, a first high-voltage bus, a second high-voltage bus, a first auxiliary transformer, a second auxiliary transformer, a first switch, a second switch, a first standby transformer, a second standby transformer, a third switch, a fourth switch, a first diesel generator, a second diesel generator, a fifth switch, a sixth switch, a first contact switch and a second contact switch; The main generator is connected to the first high-voltage bus; the main transformer is connected to the first high-voltage bus; the first high-voltage bus is connected to the first medium-voltage bus through the first auxiliary transformer and the first switch; the first high-voltage bus is connected to the second medium-voltage bus through the second auxiliary transformer and the second switch; the second high-voltage bus is connected to the first medium-voltage bus through the first standby transformer and the third switch; the second high-voltage bus is connected to the second medium-voltage bus through the second standby transformer and the fourth switch; the first medium-voltage bus is connected to the first diesel generator through the fifth switch; the second medium-voltage bus is connected to the second diesel generator through the sixth switch; The first diesel power supply bus connects the first medium-voltage buses in each of the unit modules through the first contact switches in each of the unit modules; The second diesel power supply bus connects the second medium-voltage buses in each of the unit modules through the second contact switches in each of the unit modules.

2. The multi-unit nuclear power plant power supply system according to claim 1, characterized in that Further including: A first standby diesel engine, a third contact switch and a fourth contact switch; The first standby diesel engine is connected to the first diesel power supply bus through the third contact switch; The first standby diesel engine is connected to the second diesel power supply bus through the fourth contact switch.

3. The multi-unit nuclear power plant power supply system according to claim 2, characterized in that, The first diesel power supply bus and the second diesel power supply bus share a diesel power supply bus; The diesel power supply bus connects the first medium-voltage buses in each of the unit modules through the first contact switches in each of the unit modules; The diesel power supply bus connects the second medium-voltage buses in each of the unit modules through the second contact switches in each of the unit modules; The third contact switch and the fourth contact switch share a fifth contact switch; the first standby diesel engine is connected to the diesel power supply bus through the fifth contact switch.

4. The multi-unit nuclear power plant power supply system according to claim 1, characterized in that, Further including: A second standby diesel engine, a third standby diesel engine, a sixth contact switch and a seventh contact switch; The second standby diesel engine is connected to the first diesel power supply bus through the sixth contact switch; The third standby diesel engine is connected to the second diesel power supply bus through the seventh contact switch.

5. The multi-unit nuclear power plant power supply system according to claim 1, characterized in that Each of the unit modules further includes: a first controller, a second controller and a master controller; The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch; The master controller is electrically connected to each of the first contact switches and the second contact switches.

6. The multi-unit nuclear power plant power supply system according to claim 1, characterized in that, It further includes: A first low-voltage relay and a second low-voltage relay; The first low-voltage relay is connected to the first medium-voltage bus; The second low-voltage relay is connected to the second medium-voltage bus.

7. The multi-unit nuclear power plant power supply system according to claim 3, characterized in that, Each of the unit modules further includes: a first controller, a second controller, and a master controller; The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch; The master controller is electrically connected to each of the third contact switches and the fourth contact switches; the master controller is connected to the first standby diesel engine.

8. The multi-unit nuclear power plant power supply system according to claim 7, characterized in that, The master controller is further connected to the fifth contact switch.

9. The multi-unit nuclear power plant power supply system according to claim 4, characterized in that, Each of the unit modules further includes: a first controller, a second controller, and a master controller; The first controller is connected to the first diesel generator; the second controller is connected to the second diesel generator; the first controller is connected to the first switch, the third switch, and the fifth switch; the second controller is connected to the second switch, the fourth switch, and the sixth switch; The master controller is electrically connected to the second standby diesel engine, the third standby diesel engine, the sixth contact switch, and the seventh contact switch.

Images