Power supply system

Abstract

The invention provides a power supply system, which is applied to the technical field of nuclear power and comprises an energy storage module, a power generation module, a first power supply module and a first switch, the first output end of the power generation module is connected with the input end of the first power supply module. The second output end of the power generation module is connected with the input end of the energy storage module through the first switch. Wherein under the condition that the first power supply module needs full load supply, the first switch is in an off state so as to provide all electric quantity of the power generation module for the first power supply module, and under the condition that the first power supply module needs preset load supply, the first switch is in an on state so as to store redundant electric quantity of the power generation module in the energy storage module; the load value of the preset load is lower than a preset value. According to the power supply system, redundant electric quantity of the power generation module is stored in the energy storage module, and then the energy storage module can supply the part of electric quantity to other equipment, so that the utilization rate of energy is improved.

Description

Technical Field

[0001] The present application relates to the field of nuclear power technology, and in particular to a power supply system. Background Art

[0002] A nuclear power plant is a power plant that converts nuclear energy into thermal energy to generate steam for steam turbines, which in turn drive generators to form power plants that generate commercial electricity. Unlike fossil fuel power generation, nuclear power generation does not emit huge amounts of pollutants into the atmosphere, so nuclear power generation does not cause air pollution. However, in the existing nuclear power supply system, when the grid load is at a low point, part of the steam is discharged into the atmosphere, and the power plant output power cannot be fully utilized, resulting in low energy utilization. Summary of the invention

[0003] The embodiment of the present application provides a power supply system to solve the problem of low energy utilization in the existing power supply system.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] An embodiment of the present application provides a power supply system, which includes:

[0006] An energy storage module, a power generation module, a first power supply module and a first switch;

[0007] The first output end of the power generation module is connected to the input end of the first power supply module, and the second output end of the power generation module is connected to the input end of the energy storage module through the first switch;

[0008] Among them, when the first power supply module needs to be supplied at full load, the first switch is in an open state to provide all the power of the power generation module to the first power supply module. When the first power supply module needs to be supplied with a preset load, the first switch is in a closed state to store excess power of the power generation module in the energy storage module. The load value of the preset load is lower than the preset value.

[0009] Optionally, the power supply system further includes a second power supply module and a second switch, and an input end of the second power supply module is connected to the first output end of the energy storage module through the second switch.

[0010] Optionally, the power generation module includes a main power generation module and a backup power generation module, and the first power supply module includes a main power supply module and a backup power supply module;

[0011] The output end of the main power generation module is connected to the input end of the main power supply module, and the input end of the energy storage module is connected between the output end of the main power generation module and the input end of the main power supply module through the first switch;

[0012] The output end of the backup power generation module is connected to the first input end of the backup power supply module, and the output end of the main power supply module is connected to the second input end of the backup power supply module.

[0013] Optionally, the power supply system further includes a switch module;

[0014] The second output terminal of the energy storage module is connected to the third input terminal of the backup power supply module through the switch module.

[0015] Optionally, the switch module includes a third switch, a fourth switch, a fifth switch and a sixth switch, and the backup power generation module includes a first diesel generator and a second diesel generator;

[0016] The second output end of the energy storage module is connected between the output end of the first diesel generator and the input end of the backup power supply module through the third switch and the fourth switch;

[0017] The second output end of the energy storage module is connected between the output end of the second diesel generator and the input end of the backup power supply module through the third switch, the fifth switch and the sixth switch.

[0018] Optionally, the switch module further includes a seventh switch, and the backup power generation module further includes a full-site power-off SBO diesel generator;

[0019] The second output end of the energy storage module is connected to the input end of the backup power supply module through the third switch, the fifth switch and the seventh switch.

[0020] Optionally, the energy storage system further includes a load switch, the main power supply module includes a power grid system and a normal plant bus, and the main power generation module includes a steam turbine and a generator;

[0021] The output end of the steam turbine is connected to the input end of the generator, the output end of the generator is connected to the first end of the load switch, and the second end of the load switch is respectively connected to the input end of the normal plant bus, the input end of the energy storage module and the input end of the power grid system;

[0022] The output end of the normal plant bus is connected to the second input end of the backup power supply module.

[0023] Optionally, the power supply system further includes a first transformer, a second transformer, a third transformer and a fourth transformer;

[0024] The second end of the load switch is connected to the input end of the first transformer, and the output end of the first transformer is connected to the input end of the power grid system;

[0025] The second end of the load switch is connected to the input end of the second transformer, and the output end of the second transformer is connected to the input end of the normal plant bus;

[0026] The second end of the load switch is connected to the input end of the third transformer, and the output end of the third transformer is connected to the input end of the normal plant bus;

[0027] The second end of the load switch is connected to the input end of the fourth transformer, and the output end of the fourth transformer is connected to the input end of the energy storage module through the first switch.

[0028] Optionally, the energy storage module includes a mobile power source and a battery pack;

[0029] The output end of the fourth transformer is connected to the first input end of the battery pack through the first switch;

[0030] The output end of the mobile power source is connected to the second input end of the battery pack.

[0031] Optionally, the backup power supply module is an emergency plant bus.

[0032] The power supply system of the embodiment of the present application includes an energy storage module, a power generation module, a first power supply module and a first switch; the first output end of the power generation module is connected to the input end of the first power supply module, and the second output end of the power generation module is connected to the input end of the energy storage module through the first switch; wherein, when the first power supply module needs to be supplied at full load, the first switch is in an open state to provide all the power of the power generation module to the first power supply module, and when the first power supply module needs to be supplied with a preset load, the first switch is in a closed state to store the excess power of the power generation module in the energy storage module, and the load value of the preset load is lower than the preset value. The power supply system stores the excess power of the power generation module in the energy storage module, and then the energy storage module can supply this part of the power to other devices, thereby improving the utilization rate of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 It is one of the structural diagrams of the power supply system provided in the embodiment of the present application;

[0035] Figure 2 This is the second structural diagram of the power supply system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The present application embodiment provides a power supply system. Figure 1 , Figure 1 is a structural diagram of a power supply system provided in an embodiment of the present application, such as Figure 1 As shown, the power supply system includes:

[0038] An energy storage module, a power generation module, a first power supply module and a first switch;

[0039] The first output end of the power generation module is connected to the input end of the first power supply module, and the second output end of the power generation module is connected to the input end of the energy storage module through the first switch;

[0040] Among them, when the first power supply module needs to be supplied at full load, the first switch is in an open state to provide all the power of the power generation module to the first power supply module. When the first power supply module needs to be supplied with a preset load, the first switch is in a closed state to store excess power of the power generation module in the energy storage module. The load value of the preset load is lower than the preset value.

[0041] In the power supply system of the embodiment of the present application, the above-mentioned power generation module may include a steam turbine, a generator and a diesel generator of a nuclear power plant, etc., and the first power supply module may include a power grid system and a plant bus, etc. The existing power supply system of a nuclear power plant is to drive the generator to supply power to various equipment of the power grid system and various equipment of the nuclear power plant through the steam generated by the steam turbine, but when the various equipment of the power grid system does not need so much electricity, part of the steam in the steam turbine will be discharged into the atmosphere, resulting in a low energy utilization rate. In view of this problem, the embodiment of the present application provides an energy storage module, the input end of which is connected to the second output end of the power generation module through a first switch.

[0042] When the various devices that the first power supply module provides power to need full load supply, the first switch is controlled to be disconnected, and the power generation module transmits all the power to the first power supply module, and the nuclear power plant operates at full power to supply the power grid system and the power supply of the plant; when the first power supply module needs low load supply, that is, the required load value is lower than the preset value, the first switch is controlled to be closed, so that the nuclear power plant maintains full power operation, because frequent power changes will cause adverse effects on the reactor during operation, and maintaining full power operation is conducive to improving the stability of power plant operation. In addition, maintaining full power operation can also reduce the wear caused by frequent start and stop of equipment, thereby extending the service life of the equipment, because there is no need to adjust various equipment to match the load of the power grid and the power plant. Then the excess electrical energy is stored in the energy storage module in the form of chemical energy, and then the energy storage module can supply this part of the electricity to other equipment, thereby improving the utilization rate of energy.

[0043] Optionally, the power supply system further includes a second power supply module and a second switch, and an input end of the second power supply module is connected to the first output end of the energy storage module through the second switch.

[0044] In the power supply system of the embodiment of the present application, continue to refer to Figure 1 The power supply system also includes a second power supply module and a second switch, and the input end of the second power supply module is connected to the first output end of the energy storage module through the second switch. When the energy storage module has sufficient power, the second switch can be controlled to close, and the power of the energy storage module can be supplied to other devices, such as electric vehicle charging piles, etc., which is conducive to further improving the utilization rate of energy and increasing revenue.

[0045] Optionally, the power generation module includes a main power generation module and a backup power generation module, and the first power supply module includes a main power supply module and a backup power supply module;

[0046] The output end of the main power generation module is connected to the input end of the main power supply module, and the input end of the energy storage module is connected between the output end of the main power generation module and the input end of the main power supply module through the first switch;

[0047] The output end of the backup power generation module is connected to the first input end of the backup power supply module, and the output end of the main power supply module is connected to the second input end of the backup power supply module.

[0048] In the power supply system of the embodiment of the present application, see Figure 2The power generation module includes a main power generation module and a backup power generation module. The first power supply module includes a main power supply module and a backup power supply module. The main power generation module mainly generates electricity for conventional equipment in normal operation of the nuclear power plant. The output end of the main power generation module is connected to the input end of the main power supply module. The main power generation module transmits electricity to the main power supply module, and the main power supply module supplies electricity to conventional equipment in normal operation of the nuclear power plant.

[0049] The standby power generation module mainly generates electricity for the safety equipment of the nuclear power plant in emergency situations. The output end of the standby power generation module is connected to the second input end of the standby power supply module. The standby power generation module transmits electricity to the standby power supply module, and the standby power supply module supplies electricity to the safety equipment of the nuclear power plant in emergency situations.

[0050] The input end of the energy storage module is connected between the output end of the main power generation module and the input end of the main power supply module through the first switch. When the main power supply module needs low-load supply, the first switch is controlled to close, and the main power generation module transfers excess electricity to the energy storage module for storage. The energy storage module can then supply this part of electricity to other devices, thereby improving energy utilization.

[0051] Optionally, the power supply system further includes a switch module;

[0052] The second output terminal of the energy storage module is connected to the third input terminal of the backup power supply module through the switch module.

[0053] In the power supply system of the embodiment of the present application, continue to refer to Figure 2 The power supply system also includes a switch module. The second output end of the energy storage module is connected to the third input end of the backup power supply module through the switch module. When an emergency occurs in the nuclear power plant, if the capacity of the energy storage module is large enough and the power generated by the backup power generation module is insufficient, the energy storage module can be used as a backup for the backup power generation module, and the power in the energy storage module can be transmitted to the backup power supply module to supply the power to the safety equipment of the nuclear power plant in an emergency, thereby further improving the utilization rate of energy and ensuring the operation of the nuclear power plant.

[0054] Optionally, the switch module includes a third switch, a fourth switch, a fifth switch and a sixth switch, and the backup power generation module includes a first diesel generator and a second diesel generator;

[0055] The second output end of the energy storage module is connected between the output end of the first diesel generator and the input end of the backup power supply module through the third switch and the fourth switch;

[0056] The second output end of the energy storage module is connected between the output end of the second diesel generator and the input end of the backup power supply module through the third switch, the fifth switch and the sixth switch.

[0057] In the power supply system of the embodiment of the present application, the switch module specifically includes a third switch, a fourth switch, a fifth switch and a sixth switch, and the backup power generation module includes a first diesel generator and a second diesel generator. When an emergency occurs in a nuclear power plant, illustratively, if the capacity of the energy storage module is greater than a first preset value, the third switch, the fourth switch, the fifth switch and the sixth switch can be controlled to close, and the energy storage module can be used as a backup for the first diesel generator and the second diesel generator to supply power to the backup power supply module, thereby ensuring the normal operation of the nuclear power plant.

[0058] Optionally, the switch module further includes a seventh switch, and the backup power generation module further includes a full-site power-off SBO diesel generator;

[0059] The second output end of the energy storage module is connected to the input end of the backup power supply module through the third switch, the fifth switch and the seventh switch.

[0060] In the power supply system of the embodiment of the present application, the switch module may further include a seventh switch, and the backup power generation module may further include a station blackout (SBO) diesel generator. When an emergency occurs in a nuclear power plant, illustratively, if the capacity of the energy storage module is less than the first preset value but greater than the second preset value, the third switch, the fifth switch and the seventh switch may be controlled to close, and the energy storage device may be used as a backup for the SBO generator to power the backup module, thereby ensuring the normal operation of the nuclear power plant.

[0061] Optionally, the energy storage system further includes a load switch, the main power supply module includes a power grid system and a normal plant bus, and the main power generation module includes a steam turbine and a generator;

[0062] The output end of the steam turbine is connected to the input end of the generator, the output end of the generator is connected to the first end of the load switch, and the second end of the load switch is respectively connected to the input end of the normal plant bus, the input end of the energy storage module and the input end of the power grid system;

[0063] The output end of the normal plant bus is connected to the second input end of the backup power supply module.

[0064] In the power supply system of the embodiment of the present application, specifically, the main power supply module includes a power grid system and a normal plant bus, and the main power generation module includes a steam turbine and a generator. The steam generated by the steam turbine drives the generator to generate electricity. When the nuclear power plant needs to operate at full power, the electricity generated by the generator is fully transmitted to the power grid system and the normal plant bus, thereby maintaining the normal operation of conventional equipment in the nuclear power plant.

[0065] Optionally, the power supply system further includes a first transformer, a second transformer, a third transformer and a fourth transformer;

[0066] The second end of the load switch is connected to the input end of the first transformer, and the output end of the first transformer is connected to the input end of the power grid system;

[0067] The second end of the load switch is connected to the input end of the second transformer, and the output end of the second transformer is connected to the input end of the normal plant bus;

[0068] The second end of the load switch is connected to the input end of the third transformer, and the output end of the third transformer is connected to the input end of the normal plant bus;

[0069] The second end of the load switch is connected to the input end of the fourth transformer, and the output end of the fourth transformer is connected to the input end of the energy storage module through the first switch.

[0070] In the power supply system of the embodiment of the present application, it also includes a first transformer, a second transformer, a third transformer and a fourth transformer. The transformers in the embodiment of the present application mainly play a role of voltage reduction. Each transformer reduces the voltage of the electricity generated by the generator to within an appropriate range, and then supplies it to the equipment of the nuclear power plant, which can not only realize long-distance power transmission, but also ensure the safe operation of each equipment.

[0071] Optionally, the energy storage module includes a mobile power source and a battery pack;

[0072] The output end of the fourth transformer is connected to the first input end of the battery pack through the first switch;

[0073] The output end of the mobile power source is connected to the second input end of the battery pack.

[0074] In the power supply system of the embodiment of the present application, the energy storage module specifically includes a mobile power supply and a battery pack. The output end of the fourth transformer is specifically connected to the first input end of the battery pack through a first switch. When the first power supply module requires low load supply, that is, the required load value is lower than a preset value, the first switch is controlled to close so that the nuclear power plant maintains full power operation, and then the excess electricity is stored in the battery pack in the form of chemical energy.

[0075] The output end of the mobile power supply is connected to the second input end of the battery pack. The mobile power supply can be moved at any time in an emergency situation of the nuclear power plant and provide DC power supply to ensure the normal operation of some safety equipment in the nuclear power plant.

[0076] Optionally, the backup power supply module is an emergency plant bus.

[0077] In the power supply system of the embodiment of the present application, the backup power supply module is an emergency plant busbar, which is used to supply power to the safety equipment of the nuclear power plant.

[0078] Here, it is necessary to explain the source of power for the emergency plant bus: the power of the emergency plant bus first comes from the normal plant bus; when the power source of the normal plant bus is insufficient, it relies on diesel generators and SBO diesel generators to generate electricity; when the power generation of each diesel generator is insufficient, it relies on battery packs and mobile power supplies as power backup. This power supply method meets the principle of defense in depth and can effectively guarantee the power source of the emergency plant bus, thereby maintaining the normal operation of the safety equipment of the nuclear power plant in emergency situations.

[0079] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0080] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A power supply system, characterized in that: The power supply system comprises: An energy storage module, a power generation module, a first power supply module and a first switch; The first output end of the power generation module is connected to the input end of the first power supply module, and the second output end of the power generation module is connected to the input end of the energy storage module through the first switch; Among them, when the first power supply module needs to be supplied at full load, the first switch is in an open state to provide all the power of the power generation module to the first power supply module. When the first power supply module needs to be supplied with a preset load, the first switch is in a closed state to store excess power of the power generation module in the energy storage module. The load value of the preset load is lower than the preset value.

2. The power supply system according to claim 1, characterized in that: The power supply system further includes a second power supply module and a second switch, wherein an input end of the second power supply module is connected to a first output end of the energy storage module via the second switch.

3. The power supply system according to claim 1, characterized in that: The power generation module includes a main power generation module and a backup power generation module, and the first power supply module includes a main power supply module and a backup power supply module; The output end of the main power generation module is connected to the input end of the main power supply module, and the input end of the energy storage module is connected between the output end of the main power generation module and the input end of the main power supply module through the first switch; The output end of the backup power generation module is connected to the first input end of the backup power supply module, and the output end of the main power supply module is connected to the second input end of the backup power supply module.

4. The power supply system according to claim 3, characterized in that: The power supply system also includes a switch module; The second output terminal of the energy storage module is connected to the third input terminal of the backup power supply module through the switch module.

5. The power supply system according to claim 4, characterized in that: The switch module includes a third switch, a fourth switch, a fifth switch and a sixth switch, and the backup power generation module includes a first diesel generator and a second diesel generator; The second output end of the energy storage module is connected between the output end of the first diesel generator and the input end of the backup power supply module through the third switch and the fourth switch; The second output end of the energy storage module is connected between the output end of the second diesel generator and the input end of the backup power supply module through the third switch, the fifth switch and the sixth switch.

6. The power supply system according to claim 5, characterized in that: The switch module further includes a seventh switch, and the backup power generation module further includes a full-field power-off SBO diesel generator; The second output end of the energy storage module is connected to the input end of the backup power supply module through the third switch, the fifth switch and the seventh switch.

7. The power supply system according to claim 3, characterized in that: The energy storage system further includes a load switch, the main power supply module includes a power grid system and a normal plant bus, and the main power generation module includes a steam turbine and a generator; The output end of the steam turbine is connected to the input end of the generator, the output end of the generator is connected to the first end of the load switch, and the second end of the load switch is respectively connected to the input end of the normal plant bus, the input end of the energy storage module and the input end of the power grid system; The output end of the normal plant bus is connected to the second input end of the backup power supply module.

8. The power supply system according to claim 7, characterized in that: The power supply system also includes a first transformer, a second transformer, a third transformer and a fourth transformer; The second end of the load switch is connected to the input end of the first transformer, and the output end of the first transformer is connected to the input end of the power grid system; The second end of the load switch is connected to the input end of the second transformer, and the output end of the second transformer is connected to the input end of the normal plant bus; The second end of the load switch is connected to the input end of the third transformer, and the output end of the third transformer is connected to the input end of the normal plant bus; The second end of the load switch is connected to the input end of the fourth transformer, and the output end of the fourth transformer is connected to the input end of the energy storage module through the first switch.

9. The power supply system according to claim 8, characterized in that: The energy storage module includes a mobile power source and a battery pack; The output end of the fourth transformer is connected to the first input end of the battery pack through the first switch; The output end of the mobile power source is connected to the second input end of the battery pack.

10. The power supply system according to claim 3, characterized in that: The backup power supply module is an emergency plant bus.

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