Modularized UPS for nuclear power station

Abstract

The utility model discloses a modularized UPS for a nuclear power station, which relates to the technical field of UPSs, and comprises a power supply module used for accessing alternating current electric energy and carrying out multi-path power supply; the storage battery control module is used for providing standby electric energy; the first switching module is used for power failure detection and electric energy switching control; the alternating current regulation module is used for performing alternating current regulation on the electric energy output by the storage battery control module; the first load module is used for receiving electric energy and supplying power to a low-voltage nuclear power station load; the diesel power generation module is used for generating power and providing standby electric energy; the second switching module is used for power failure detection and electric energy switching control; the auxiliary power supply control module is used for regularly transmitting the electric energy output by the alternating current adjusting module to the second load module when the second switching module detects power failure; and the second load module is used for receiving electric energy and supplying power to the high-voltage nuclear power station load. The modularized UPS for the nuclear power station realizes uninterrupted power supply control, meets power utilization requirements, and improves power supply efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of UPS, in particular to a modular UPS for nuclear power plants. Background Art

[0002] A nuclear power plant is a facility that converts nuclear energy into electrical energy through appropriate devices. Under normal circumstances, its main power supply (i.e., normal power supply) outputs power. When the main power supply loses power, a modular UPS (Uninterruptible Power Supply) will replace the main power supply output to supply power to the nuclear power plant. In the existing technology, modular UPS for nuclear power plants generally adopts a diesel-battery hybrid backup power supply system to meet the power needs of nuclear power plants in different situations. However, when switching power, the diesel backup power supply system requires a certain amount of startup time, resulting in the inability to timely control the backup power supply. This puts the nuclear power plant at risk of power outage and thus needs improvement. Utility Model Content

[0003] The embodiment of the present utility model provides a modular UPS for a nuclear power plant to solve the problems raised in the above background technology.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A modular UPS for a nuclear power plant, comprising: a power module, a first switching module, a battery control module, an AC regulation module, a first load module, a second switching module, an auxiliary power supply control module, a diesel generator module, and a second load module;

[0006] A power module, configured to receive AC power and perform multi-channel power supply, outputting a first power and a second power;

[0007] A battery control module is used to provide direct current power and invert the direct current power to output a third type of power;

[0008] a first switching module connected to the power module, the first load module and the battery control module, configured to transmit the first electric energy to the first load module, perform power failure detection on the first electric energy and transmit the third electric energy to the first load module when a power failure occurs;

[0009] an AC regulation module, connected to the battery control module, configured to perform AC-AC regulation on the third electric energy and output fourth electric energy;

[0010] a first load module, configured to receive electric energy transmitted by the first switching module and supply power to a connected low-voltage nuclear power plant load;

[0011] A diesel generator module is used to provide the fifth electrical energy;

[0012] a second switching module, connected to the power module, the second load module and the diesel generator module, configured to transmit the second electrical energy to the second load module, perform power failure detection on the second electrical energy and, when a power failure occurs, output a first control signal and transmit the fifth electrical energy to the second load module;

[0013] an auxiliary power supply control module, connected to the AC regulation module and the second load module, for setting a timing time and transmitting the fourth electric energy to the second switching module on a regular basis upon receiving a first control signal;

[0014] The second load module is used to receive the second electric energy and the fifth electric energy transmitted by the second switching module, receive the fourth electric energy transmitted by the auxiliary power supply control module, and supply power to the connected high-voltage nuclear power plant load.

[0015] As a further solution of the present invention: the power module includes a power interface and a multi-channel output transformer; the first switching module includes a first relay switch, a second relay switch, a first power supply, a second resistor, a first resistor, a first relay, a first optocoupler and a first switching tube; the first load module includes a first load interface;

[0016] Preferably, the first end and the second end of the power supply interface are respectively connected to the first input end and the second input end of the multi-channel output transformer, the first output end of the multi-channel output transformer is connected to the moving end of the first relay switch and is connected to the first end of the first optocoupler through the second resistor, the second end of the first optocoupler is grounded, the third end of the first optocoupler is connected to the base of the first switching tube and is connected to the first power supply and one end of the first relay through the first resistor, the other end of the first relay is connected to the collector of the first switching tube, the emitter of the first switching tube and the fourth end of the first optocoupler are both grounded, the static end of the first relay switch is connected to the first end of the first load interface and the static end of the second relay switch, the moving end of the second relay switch is connected to the battery control module, and the ground end of the multi-channel output transformer and the second end of the first load interface are both grounded.

[0017] As a further solution of the present invention: the battery control module includes a battery module and a first inverter;

[0018] Preferably, the first and second ends of the battery module are respectively connected to the first input and second input ends of the first inverter, the first output end of the first inverter is connected to the active end of the second relay switch, and the second output end of the first inverter is connected to the ground end of the multi-channel output transformer.

[0019] As a further solution of the present invention: the AC regulation module includes a third resistor, a first capacitor, a first thyristor, a first bidirectional diode, a first potentiometer, a second capacitor, a fourth resistor and a first transformer; the auxiliary power supply control module includes a fifth relay switch;

[0020] Preferably, one end of the third resistor is connected to the moving end of the second relay switch, one end of the first thyristor, the slider end of the first potentiometer, one end of the first potentiometer, one end of the fourth resistor and the first output end of the first inverter, the other end of the third resistor is connected to the other end of the first thyristor, one end of the second capacitor and the first end of the primary side of the first transformer through the first capacitor, the control end of the first thyristor is connected to one end of the first bidirectional diode, the other end of the first bidirectional diode is connected to the other end of the second capacitor, the other end of the first potentiometer and the other end of the fourth resistor, the second end of the primary side of the first transformer is connected to the second output end of the first inverter, the first end of the secondary side of the first transformer is connected to the moving end of the fifth relay switch, the static end of the fifth relay switch is connected to the second load module, and the second end of the secondary side of the first transformer is connected to the ground end of the multi-channel output transformer.

[0021] As a further solution of the present invention: the diesel generator module includes a diesel generator device; the second switching module includes a third relay switch, a fourth relay switch, a fifth resistor, a second optical coupler, a second power supply, a sixth resistor, a second relay and a second switch tube;

[0022] Preferably, the first end of the diesel generator is connected to the moving end of the fourth relay switch, the static end of the fourth relay switch is connected to the first end of the second load interface, the static end of the third relay switch and the static end of the third relay switch, the moving end of the third relay switch is connected to the second output end of the multi-channel output transformer and is connected to the first end of the second optocoupler through the fifth resistor, the second end of the second optocoupler is grounded, the third end of the second optocoupler is connected to the base of the second switch tube, the auxiliary power supply control module and the first end of the sixth resistor, the second end of the sixth resistor is connected to the second power supply and one end of the second relay, the other end of the second relay is connected to the collector of the second switch tube, and the emitter of the second switch tube and the fourth end of the second optocoupler are both grounded.

[0023] As a further solution of the present invention: the auxiliary power supply control module further includes a first diode, a seventh resistor, a first timer, a third capacitor, a fourth capacitor, a third switch tube and a third relay;

[0024] Preferably, the cathode of the first diode is connected to the first end of the sixth resistor, one end of the seventh resistor, one end of the third relay, the fourth end and the eighth end of the first timer, the anode of the first diode is connected to the other end of the seventh resistor, the second end and the sixth end of the first timer and is grounded through the third capacitor, the first end of the first timer and the emitter of the third switch tube are both grounded, the fifth end of the first timer is grounded through the fourth capacitor, the base of the third switch tube is connected to the third end of the first timer, and the collector of the third switch tube is connected to the other end of the third relay.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the modular UPS for nuclear power plants of the present invention can respectively detect power failures of the electric energy input to the first load module and the second load module by the first switching module and the second switching module; when the first load module loses power, the battery control module provides backup power supply; when the second load module loses power, the auxiliary power supply control module transmits the electric energy output by the AC regulation module to the second load module in a timely manner, and during the timing period, starts the diesel generator module and provides backup power supply to meet the power demand of the second load module and improve the power supply efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The present invention provides a block diagram of the principle of a modular UPS for nuclear power plants.

[0028] Figure 2 This is a circuit diagram of a modular UPS for a nuclear power plant provided in an example of the present utility model.

[0029] Figure 3 This is a connection circuit diagram of the auxiliary power supply control module provided by an example of the present utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In one embodiment, see Figure 1 A modular UPS for a nuclear power plant includes: a power module 1, a first switching module 2, a battery control module 3, an AC regulation module 4, a first load module 5, a second switching module 6, an auxiliary power supply control module 7, a diesel generator module 8, and a second load module 9;

[0032] Specifically, the power module 1 is used to receive AC power and perform multi-channel power supply work, outputting the first power and the second power;

[0033] The battery control module 3 is used to provide DC power and invert the DC power to output the third power;

[0034] a first switching module 2 connected to the power module 1, the first load module 5 and the battery control module 3, configured to transmit the first electric energy to the first load module 5, perform power failure detection on the first electric energy and transmit the third electric energy to the first load module 5 when a power failure occurs;

[0035] an AC regulation module 4 connected to the battery control module 3 and configured to perform AC-AC regulation on the third electric energy and output fourth electric energy;

[0036] A first load module 5 is configured to receive the electric energy transmitted by the first switching module 2 and supply power to the connected low-voltage nuclear power plant load;

[0037] A diesel generator module 8 is used to provide a fifth electrical energy;

[0038] a second switching module 6 connected to the power module 1, the second load module 9 and the diesel generator module 8, configured to transmit the second electric energy to the second load module 9, perform power failure detection on the second electric energy and output a first control signal and transmit the fifth electric energy to the second load module 9 when a power failure occurs;

[0039] An auxiliary power supply control module 7 is connected to the AC regulation module 4 and the second load module 9, and is used to set a timing time and transmit the fourth electric energy to the second switching module 6 on a regular basis upon receiving a first control signal;

[0040] The second load module 9 is configured to receive the second electric energy and the fifth electric energy transmitted by the second switching module 6 , receive the fourth electric energy transmitted by the auxiliary power supply control module 7 , and supply power to the connected high-voltage nuclear power plant load.

[0041] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface and a multi-channel output transformer to access AC power, perform multi-channel transformation on the AC power and output it; the first switching module 2 can adopt a first switching circuit composed of a photoelectric coupler, a transistor, a resistor, a relay, etc., which can detect power failure of the first load module 5, and complete the power supply switching between the power supply module 1 and the battery control module 3 when power failure occurs; the battery control module 3 can adopt a battery control circuit composed of a battery module and an inverter to provide DC power and perform inversion processing; the AC regulation module 4 can adopt an AC regulation circuit composed of a thyristor, a resistor, a capacitor, a transformer, etc. to perform AC-AC regulation processing on the power output by the battery control module 3; the first load module 5 can adopt The first load circuit composed of the first load interface is connected to the low-voltage load of the nuclear power plant; the above-mentioned second switching module 6 can adopt a second switching circuit composed of a photoelectric coupler, a resistor, a transistor, a relay, etc., which can detect power failure of the electric energy input to the second load module 9, and when a power failure occurs, complete the switching power supply of the diesel generator module 8 and the power supply module 1; the above-mentioned auxiliary power supply control module 7 can adopt an auxiliary power supply control circuit composed of a timer, a diode, a transistor, a relay, etc., which can perform timing work and control the AC regulation module 4 to supply power to the second load module 9 in a timely manner; the above-mentioned diesel generator module 8 can adopt a diesel generator circuit composed of a diesel generator device to provide AC backup power; the above-mentioned second load module 9 can adopt a second load circuit composed of a second load interface to be connected to the high-voltage load of the nuclear power plant.

[0042] In another embodiment, see Figure 1 、 Figure 2 and Figure 3 The power module 1 includes a power interface and a multi-channel output transformer; the first switching module 2 includes a first relay switch K1-1, a second relay switch K1-2, a first power supply VCC1, a second resistor R2, a first resistor R1, a first relay K1, a first optocoupler J1 and a first switch tube V1; the first load module 5 includes a first load interface;

[0043] Specifically, the first end and the second end of the power interface are respectively connected to the first input end and the second input end of the multi-channel output transformer, the first output end of the multi-channel output transformer is connected to the moving end of the first relay switch K1-1 and is connected to the first end of the first optocoupler J1 through the second resistor R2, the second end of the first optocoupler J1 is grounded, the third end of the first optocoupler J1 is connected to the base of the first switching tube V1 and is connected to the first power supply VCC1 and one end of the first relay K1 through the first resistor R1, the other end of the first relay K1 is connected to the collector of the first switching tube V1, the emitter of the first switching tube V1 and the fourth end of the first optocoupler J1 are both grounded, the static end of the first relay switch K1-1 is connected to the first end of the first load interface and the static end of the second relay switch K1-2, the dynamic end of the second relay switch K1-2 is connected to the battery control module 3, and the ground end of the multi-channel output transformer and the second end of the first load interface are both grounded.

[0044] In a specific embodiment, the above-mentioned first relay switch K1-1 can be a normally closed switch, and the second relay switch K1-2 can be a normally open switch, both of which are controlled by the first relay K1 through magnetic attraction; the above-mentioned first optocoupler J1 can be a TLP620 photoelectric coupler; the above-mentioned first switch tube V1 can be an NPN transistor.

[0045] Furthermore, the battery control module 3 includes a battery module and a first inverter T1;

[0046] Specifically, the first end and the second end of the battery module are respectively connected to the first input end and the second input end of the first inverter T1, the first output end of the first inverter T1 is connected to the active end of the second relay switch K1-2, and the second output end of the first inverter T1 is connected to the ground end of the multi-channel output transformer.

[0047] In a specific embodiment, the first inverter T1 may be composed of four groups of IGBTs and a single chip microcomputer to perform inversion processing on the input electric energy.

[0048] Furthermore, the AC regulation module 4 includes a third resistor R3, a first capacitor C1, a first thyristor S1, a first bidirectional diode VD1, a first potentiometer RP1, a second capacitor C2, a fourth resistor R4 and a first transformer B1; the auxiliary power supply control module 7 includes a fifth relay switch K3-1;

[0049] Specifically, one end of the third resistor R3 is connected to the moving end of the second relay switch K1-2, one end of the first thyristor S1, the slider end of the first potentiometer RP1, one end of the first potentiometer RP1, one end of the fourth resistor R4, and the first output end of the first inverter T1. The other end of the third resistor R3 is connected to the other end of the first thyristor S1, one end of the second capacitor C2, and the first end of the primary side of the first transformer B1 through the first capacitor C1. The control end of the first thyristor S1 is connected to one end of the first bidirectional diode VD1. The other end of the first bidirectional diode VD1 is connected to the other end of the second capacitor C2, the other end of the first potentiometer RP1, and the other end of the fourth resistor R4. The second end of the primary side of the first transformer B1 is connected to the second output end of the first inverter T1. The first end of the secondary side of the first transformer B1 is connected to the moving end of the fifth relay switch K3-1. The static end of the fifth relay switch K3-1 is connected to the second load module 9. The second end of the secondary side of the first transformer B1 is connected to the ground end of the multi-channel output transformer.

[0050] In a specific embodiment, the first thyristor S1 can be a bidirectional thyristor; the first potentiometer RP1 can perform AC regulation processing; and the fifth relay switch K3 - 1 can be a normally open switch.

[0051] Furthermore, the diesel power generation module 8 includes a diesel power generation device; the second switching module 6 includes a third relay switch K2-1, a fourth relay switch K2-2, a fifth resistor R5, a second optical coupler J2, a second power supply VCC2, a sixth resistor R6, a second relay K2 and a second switch tube V2;

[0052] Specifically, the first end of the diesel generator set is connected to the moving end of the fourth relay switch K2-2, the static end of the fourth relay switch K2-2 is connected to the first end of the second load interface, the static end of the third relay switch K2-1 and the static end of the third relay switch K2-1, the moving end of the third relay switch K2-1 is connected to the second output end of the multi-channel output transformer and connected to the first end of the second optocoupler J2 through the fifth resistor R5, the second end of the second optocoupler J2 is grounded, the third end of the second optocoupler J2 is connected to the base of the second switching tube V2, the auxiliary power supply control module 7 and the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the second power supply VCC2 and one end of the second relay K2, the other end of the second relay K2 is connected to the collector of the second switching tube V2, and the emitter of the second switching tube V2 and the fourth end of the second optocoupler J2 are both grounded.

[0053] In a specific embodiment, the third relay switch K2-1 can be a normally closed switch, and the fourth relay switch K2-2 can be a normally open switch, both of which are controlled by the second relay K2 through magnetic attraction; the second optocoupler J2 can be a TLP620 photoelectric coupler; and the second switch tube V2 can be an NPN transistor.

[0054] Furthermore, the auxiliary power supply control module 7 further includes a first diode D1, a seventh resistor R7, a first timer IC1, a third capacitor C3, a fourth capacitor C4, a third switch tube V3 and a third relay K3;

[0055] Specifically, the cathode of the first diode D1 is connected to the first end of the sixth resistor R6, one end of the seventh resistor R7, one end of the third relay K3, the fourth end and the eighth end of the first timer IC1, the anode of the first diode D1 is connected to the other end of the seventh resistor R7, the second end and the sixth end of the first timer IC1, and is grounded through the third capacitor C3. The first end of the first timer IC1 and the emitter of the third switch tube V3 are both grounded, the fifth end of the first timer IC1 is grounded through the fourth capacitor C4, the base of the third switch tube V3 is connected to the third end of the first timer IC1, and the collector of the third switch tube V3 is connected to the other end of the third relay K3.

[0056] In a specific embodiment, the first timer IC1 may use an NE555 chip, which can be used in conjunction with the first diode D1, the seventh resistor R7, the third capacitor C3 and the fourth capacitor C4 to set the timing time, and output a high-level signal during the timing time, and output a low-level signal after the timing ends; the third switch tube V3 may use an NPN transistor; the third relay K3 controls the operation of the fifth relay switch K3-1 by magnetic attraction.

[0057] In a modular UPS for a nuclear power plant according to this embodiment, AC power is connected to a power interface, a multi-channel output transformer performs multi-channel voltage transformation and multi-channel output, and is transmitted to a first load interface by a first relay switch K1-1 and to a second load interface by a third relay switch K2-1. A first optocoupler J1 performs power-off detection on the power transmitted to the first load interface, and when a power-off occurs, the first optocoupler J1 is cut off, the first power supply VCC1 triggers the first switch tube V1 to turn on through the first resistor R1, the first relay K1 is energized and controls the first relay switch K1-1 to turn off, and the second relay switch K1-2 to close, so that the power provided by the battery module is inverted by the first inverter T1 and transmitted to the first load interface. When the second optocoupler J2 detects a power-off at the second load interface, the second power supply VCC2 triggers the second switch tube V2 to turn on through the sixth resistor R6, triggering the first timer IC1 to start timing. During operation, the second relay K2 controls the third relay switch K2-1 to open and the fourth relay switch K2-2 to close, allowing the diesel generator to supply power. Since the diesel generator requires a certain amount of startup time, the first timer IC1 cooperates with the first diode D1, the seventh resistor R7, the third capacitor C3 and the fourth capacitor C4 to output a high-level signal within the timing period, controlling the third switch tube V3 to turn on. The third relay K3 is energized and controls the fifth relay switch K3-1 to close. The AC power regulated by the first transformer B1, the third resistor R3, the first capacitor C1, the first thyristor S1, the first bidirectional diode VD1, the first potentiometer RP1, the fourth resistor R4 and the second capacitor C2 is transmitted to the second load interface through the fifth relay switch K3-1 for short-term power supply. At the same time, adjusting the resistance value of the first potentiometer RP1 can adjust the power transmitted by the fifth relay switch K3-1.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A modular UPS for a nuclear power plant, characterized in that: The modular UPS for nuclear power plants includes: a power module, a first switching module, a battery control module, an AC regulation module, a first load module, a second switching module, an auxiliary power supply control module, a diesel generator module, and a second load module; The power supply module is used to receive AC power and perform multi-channel power supply work, outputting the first power and the second power; The battery control module is used to provide direct current power and invert the direct current power to output the third power; The first switching module is connected to the power module, the first load module and the battery control module, and is used to transmit the first electric energy to the first load module, perform power failure detection on the first electric energy and transmit the third electric energy to the first load module when a power failure occurs; The AC regulation module is connected to the battery control module and is used to perform AC-AC regulation on the third electric energy and output fourth electric energy; The first load module is configured to receive the electric energy transmitted by the first switching module and supply power to the connected low-voltage nuclear power plant load; The diesel generator module is used to provide the fifth electrical energy; The second switching module is connected to the power module, the second load module and the diesel generator module, and is used to transmit the second electric energy to the second load module, perform power failure detection on the second electric energy and output a first control signal and transmit the fifth electric energy to the second load module when a power failure occurs; The auxiliary power supply control module is connected to the AC regulation module and the second load module, and is used to set a timing time and transmit the fourth electric energy to the second switching module on a regular basis upon receiving a first control signal; The second load module is used to receive the second electric energy and the fifth electric energy transmitted by the second switching module, receive the fourth electric energy transmitted by the auxiliary power supply control module, and supply power to the connected high-voltage nuclear power plant load.

2. A modular UPS for a nuclear power plant according to claim 1, characterized in that: The power module includes a power interface and a multi-channel output transformer; the first switching module includes a first relay switch, a second relay switch, a first power supply, a second resistor, a first resistor, a first relay, a first optocoupler and a first switch tube; the first load module includes a first load interface; The first end and the second end of the power supply interface are respectively connected to the first input end and the second input end of the multi-channel output transformer, the first output end of the multi-channel output transformer is connected to the moving end of the first relay switch and is connected to the first end of the first optocoupler through the second resistor, the second end of the first optocoupler is grounded, the third end of the first optocoupler is connected to the base of the first switching tube and is connected to the first power supply and one end of the first relay through the first resistor, the other end of the first relay is connected to the collector of the first switching tube, the emitter of the first switching tube and the fourth end of the first optocoupler are both grounded, the static end of the first relay switch is connected to the first end of the first load interface and the static end of the second relay switch, the dynamic end of the second relay switch is connected to the battery control module, and the ground end of the multi-channel output transformer and the second end of the first load interface are both grounded.

3. A modular UPS for a nuclear power plant according to claim 2, characterized in that: The battery control module includes a battery module and a first inverter; The first end and the second end of the battery module are respectively connected to the first input end and the second input end of the first inverter, the first output end of the first inverter is connected to the active end of the second relay switch, and the second output end of the first inverter is connected to the ground end of the multi-channel output transformer.

4. A modular UPS for a nuclear power plant according to claim 3, characterized in that: The AC regulation module includes a third resistor, a first capacitor, a first thyristor, a first bidirectional diode, a first potentiometer, a second capacitor, a fourth resistor and a first transformer; the auxiliary power supply control module includes a fifth relay switch; One end of the third resistor is connected to the moving end of the second relay switch, one end of the first thyristor, the slider end of the first potentiometer, one end of the first potentiometer, one end of the fourth resistor and the first output end of the first inverter, the other end of the third resistor is connected to the other end of the first thyristor, one end of the second capacitor and the first end of the primary side of the first transformer through the first capacitor, the control end of the first thyristor is connected to one end of the first bidirectional diode, the other end of the first bidirectional diode is connected to the other end of the second capacitor, the other end of the first potentiometer and the other end of the fourth resistor, the second end of the primary side of the first transformer is connected to the second output end of the first inverter, the first end of the secondary side of the first transformer is connected to the moving end of the fifth relay switch, the static end of the fifth relay switch is connected to the second load module, and the second end of the secondary side of the first transformer is connected to the ground end of the multi-channel output transformer.

5. The modular UPS for nuclear power plants according to claim 4, characterized in that: The diesel power generation module includes a diesel power generation device; the second switching module includes a third relay switch, a fourth relay switch, a fifth resistor, a second optical coupler, a second power supply, a sixth resistor, a second relay and a second switch tube; The first end of the diesel generator set is connected to the moving end of the fourth relay switch, the static end of the fourth relay switch is connected to the first end of the second load interface, the static end of the third relay switch and the static end of the third relay switch, the moving end of the third relay switch is connected to the second output end of the multi-channel output transformer and is connected to the first end of the second optocoupler through the fifth resistor, the second end of the second optocoupler is grounded, the third end of the second optocoupler is connected to the base of the second switching tube, the auxiliary power supply control module and the first end of the sixth resistor, the second end of the sixth resistor is connected to the second power supply and one end of the second relay, the other end of the second relay is connected to the collector of the second switching tube, and the emitter of the second switching tube and the fourth end of the second optocoupler are both grounded.

6. The modular UPS for nuclear power plants according to claim 5, characterized in that: The auxiliary power supply control module further includes a first diode, a seventh resistor, a first timer, a third capacitor, a fourth capacitor, a third switch tube and a third relay; The cathode of the first diode is connected to the first end of the sixth resistor, one end of the seventh resistor, one end of the third relay, the fourth end and the eighth end of the first timer, the anode of the first diode is connected to the other end of the seventh resistor, the second end and the sixth end of the first timer and is grounded through the third capacitor, the first end of the first timer and the emitter of the third switch tube are both grounded, the fifth end of the first timer is grounded through the fourth capacitor, the base of the third switch tube is connected to the third end of the first timer, and the collector of the third switch tube is connected to the other end of the third relay.

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