A full-electrode multi-gradient energy storage peak power generation system

Abstract

The application provides a full-electrode multi-gradient energy storage peak generation system, relates to the field of energy storage peak regulation technology, and provides the full-electrode multi-gradient energy storage peak generation system, which comprises a wind and light power station, an energy storage system and a thermal system. The wind and light power station is connected with the energy storage system, the energy storage system is connected with the thermal system, all wind power and light power energy generated by the wind and light power station is stored in the energy storage system, the output of the energy storage system is adjusted and input to the thermal system to complete relatively stable power generation, so that the randomness and intermittence of the wind power and light power can be effectively avoided to impact the power grid. In addition, all wind power and light power energy generated by the wind and light power station is stored in the energy storage system, the utilization rate of resources can be improved, resource waste can be avoided, the problem that unstable renewable energy power generation influences the stability of the power grid and even causes resource waste is solved.

Description

Technical Field

[0001] This application relates to the field of energy storage and peak shaving technology, and in particular to an all-electrode multi-gradient energy storage peak power generation system. Background Technology

[0002] At present, renewable energy sources such as wind power and solar energy in my country are developing rapidly year by year. In addition, the electricity consumption of the whole society is increasing year by year, and the peak-valley difference of power grid is increasing day by day. Maintaining the stability of power in the power grid is becoming more and more important.

[0003] In related technologies, wind power and solar power generated by wind and solar energy need to be fed into the power grid together with thermal power generated by traditional coal-fired units; because wind volume and sunshine are unstable factors, wind power and solar power will be random and intermittent.

[0004] However, the randomness and intermittency of wind and solar power can impact the grid after being fed into it, affecting its stability and security. Conversely, not feeding it into the grid would result in a waste of resources. Summary of the Invention

[0005] In view of this, this application provides an all-electrode multi-gradient energy storage peak power generation system, which aims to solve the problem that unstable renewable energy power generation affects grid stability and even causes resource waste.

[0006] To achieve the above objectives, this application provides an all-electrode multi-gradient energy storage peak power generation system, which adopts the following technical solution:

[0007] This application provides an all-electrode multi-gradient energy storage peak power generation system, including: a wind and solar power station, an energy storage system, and a thermal system;

[0008] The wind and solar power station is connected to the energy storage system, the energy storage system is connected to the thermal system, and the thermal system is used to connect to the power grid.

[0009] The wind and solar power station is configured to convert wind energy and solar energy into wind power and solar power, and transmit them to the energy storage system;

[0010] The energy storage system includes a first energy storage component, a second energy storage component, a third energy storage component, and a fourth energy storage component. The first energy storage component, the second energy storage component, the third energy storage component, and the fourth energy storage component are configured to each absorb and convert the wind power and solar power generated by the wind and solar power station, and store the energy of the wind power and solar power.

[0011] The thermal system, the third energy storage component, the second energy storage component, and the first energy storage component are connected end to end in sequence.

[0012] The thermal system is configured to heat the steam within the thermal system sequentially through the third energy storage component, the second energy storage component, and the first energy storage component, thereby generating electrical energy for input into the power grid.

[0013] The thermal system and the fourth energy storage component are connected end to end; so that the steam generated by the thermal system is transported to the fourth energy storage component for reheating after doing work, and the reheated steam is transported to the thermal system to do work and generate electrical energy for input into the power grid.

[0014] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application includes at least one of the first energy storage component, the second energy storage component, the third energy storage component, and the fourth energy storage component, which includes a heat exchanger, a first storage tank, a second storage tank, and a heat release element.

[0015] The heat exchanger, the first storage tank, the heat release element, and the second storage tank are connected end to end in sequence.

[0016] The low-temperature medium in the second storage tank is heated by the heat exchanger, so that the low-temperature medium in the second storage tank becomes a high-temperature medium and is stored in the first storage tank. Then, it is heated by the heat release element and becomes a low-temperature medium and is stored in the second storage tank.

[0017] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application includes a steam turbine unit, a generator, a condenser, and a deaerator in the thermal system.

[0018] The steam turbine unit, the condenser, and the deaerator are connected in sequence. The steam turbine unit is connected to the generator, and the generator is used to connect to the power grid.

[0019] The heat-releasing element in the first energy storage component is connected to the steam turbine unit, and the heat-releasing element in the fourth energy storage component is connected to the steam turbine unit end to end in sequence.

[0020] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application further includes a low-pressure heater group and a high-pressure heater group in the thermal system.

[0021] Both the low-pressure heater group and the high-pressure heater group are connected to the steam turbine unit;

[0022] The condenser, the low-pressure heater group, the deaerator, and the high-pressure heater group are connected in sequence.

[0023] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application further includes a first de-cooling and pressure reducing device and a second de-cooling and pressure reducing device in the thermal system.

[0024] The heat-releasing element, the first desuperheating and pressure-reducing device, the high-pressure heater group, and the heat-releasing element in the third energy storage component are connected in sequence; part of the steam heated by the heat-releasing element in the first energy storage component can be input into the high-pressure heater group via the first desuperheating and pressure-reducing device.

[0025] The second de-heating and pressure reducing device is connected between the heat release element in the fourth energy storage assembly and the low-pressure heater group.

[0026] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application has the heat release element in the first energy storage component, the first desuperheating and pressure reducing device, and the heat release element in the fourth energy storage component connected in sequence. A portion of the steam heated by the first energy storage component can also be input into the heat release element in the fourth energy storage component via the first desuperheating and pressure reducing device.

[0027] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application further includes a first feedwater pump and a second feedwater pump in the thermal system.

[0028] The first feedwater pump is connected between the deaerator and the high-pressure heater group, and the second feedwater pump is connected between the condenser and the low-pressure heater group.

[0029] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application further includes a condensate heater in the thermal system.

[0030] The condensate heater is connected between the second feed water pump and the low-pressure heater group.

[0031] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application has the heat-releasing element of the first energy storage component being a superheater, the heat-releasing element of the second energy storage component being an evaporator, the heat-releasing element of the third energy storage component being a feedwater heater, and the heat-releasing element of the fourth energy storage component being a reheater.

[0032] The water supply heater, the evaporator, the superheater, and the thermal system are connected in sequence.

[0033] In one possible implementation, the all-electrode multi-gradient energy storage peak power generation system provided in this application has a medium in at least one of the first energy storage component and the fourth energy storage component that is molten salt, a medium in the second energy storage component that is one of molten salt and oil, and a medium in the third energy storage component that is one of oil and water.

[0034] The all-electrode multi-gradient energy storage peak power generation system provided in this application includes: a wind and solar power station, an energy storage system, and a thermal system. The wind and solar power station is connected to the energy storage system, and the energy storage system is connected to the thermal system. All the wind and solar power generated by the wind and solar power station is stored in the energy storage system. By adjusting the output of the energy storage system and inputting it into the thermal system, a relatively stable power generation is achieved, effectively avoiding the impact of the randomness and intermittency of wind and solar power on the power grid. In addition, storing all the wind and solar power generated by the wind and solar power station in the energy storage system can improve the utilization rate of resources and avoid resource waste, thus solving the problem that unstable renewable energy power generation affects the stability of the power grid and even causes resource waste.

[0035] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the all-electrode multi-gradient energy storage peak power generation system provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0036] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application, and this application is not limited to the specific embodiments described below.

[0037] Figure 1 A schematic diagram of the structure of an all-electrode multi-gradient energy storage peak power generation system provided in this application embodiment;

[0038] Figure 2 To indicate Figure 1 A schematic diagram of the interconnection structure of a medium-sized wind and solar power station, energy storage system, and thermal system;

[0039] Figure 3 for Figure 2 Schematic diagram of a medium-sized wind and solar power station;

[0040] Figure 4 for Figure 2 A schematic diagram of the structure of a medium-sized energy storage system;

[0041] Figure 5 for Figure 2 A schematic diagram of the structure of a medium-temperature thermal system.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Wind and solar power stations; 110. Wind turbine generators; 120. Photovoltaic modules;

[0044] 200. Energy storage system; 210. First energy storage component; 211. Heat exchanger; 212. First storage tank; 213. Second storage tank; 214. Heat release element; 220. Second energy storage component; 230. Third energy storage component; 240. Fourth energy storage component;

[0045] 300. Thermal system; 310. Steam turbine unit; 320. Generator; 330. Condenser; 340. Deaerator; 350. Low-pressure heater group; 351. Second desuperheater and pressure reducer; 352. Second feedwater pump; 360. High-pressure heater group; 361. First desuperheater and pressure reducer; 362. First feedwater pump; 370. Condensate heater.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] In the description of this application, "multiple" means two or more, unless otherwise specified precisely.

[0051] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0052] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0053] As mentioned in the background section, in related technologies, wind power and solar power generated by wind and solar energy need to be fed into the power grid along with thermal power generated by traditional coal-fired units. Wind volume and solar radiation are unstable factors, causing wind and solar power to be random and intermittent. This randomness and intermittency of wind and solar power, once fed into the grid, can impact the grid's stability and security. If this portion of electricity is not fed into the grid, it becomes "waste electricity" and is discarded, resulting in resource waste.

[0054] In addition, in related technologies, when wind and solar power are abundant, the output of wind and solar power is high, requiring a reduction in the output of coal-fired units, i.e., reducing the temperature and pressure output of the boiler. When wind and solar power decrease, the output of coal-fired units needs to be increased. When adjusting the temperature and pressure of the boiler, this process is slow, and the boiler cannot quickly change its internal pressure and temperature. Significantly adjusting the temperature and pressure output of the boiler will also affect the stable output of electricity to the grid. Excessive adjustment of the pressure and temperature of the steam inside the boiler may also cause damage to the boiler.

[0055] Based on the aforementioned technical problems, this application provides an all-electrode multi-gradient energy storage peak power generation system. In this technical solution, the wind and solar power station is connected to the energy storage system, and the energy storage system is connected to the thermal system. All the wind and solar power generated by the wind and solar power station is stored in the energy storage system. By adjusting the output of the energy storage system and inputting it into the thermal system, a relatively stable power generation is achieved, effectively avoiding the impact of the randomness and intermittency of wind and solar power on the power grid. In addition, storing all the wind and solar power generated by the wind and solar power station in the energy storage system can improve the utilization rate of resources and avoid resource waste, thus solving the problem that unstable renewable energy power generation affects the stability of the power grid and even causes resource waste.

[0056] It should be noted that, Figures 1 to 5 The diagram illustrates a simplified schematic of the components in an all-electrode multi-gradient energy storage peak power generation system. The specific structures of the remaining components in the all-electrode multi-gradient energy storage peak power generation system are not limited to these schematics. Figures 1 to 5 of examples.

[0057] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0058] Reference Figure 1 and Figure 2 As shown in the embodiment of this application, an all-electrode multi-gradient energy storage peak power generation system includes: a wind and solar power station 100, an energy storage system 200, and a thermal system 300.

[0059] The wind and solar power station 100 is connected to the energy storage system 200, the energy storage system 200 is connected to the thermal system 300, and the thermal system 300 is used to connect to the power grid.

[0060] It should be noted that the wind and solar power station 100 includes at least one wind turbine generator 110 and at least one photovoltaic module 120. The wind and solar power station 100 is a related technology in this field, and its specific structure is not limited here.

[0061] The wind and solar power station 100 is configured to convert wind energy and solar energy into wind power and solar power, and transmit them to the energy storage system 200.

[0062] The energy storage system 200 includes a first energy storage component 210, a second energy storage component 220, a third energy storage component 230, and a fourth energy storage component 240. The first energy storage component 210, the second energy storage component 220, the third energy storage component 230, and the fourth energy storage component 240 are configured to absorb and convert the wind power and solar power generated by the wind and solar power station 100, and store the energy of the wind power and solar power.

[0063] The thermal system 300, the third energy storage component 230, the second energy storage component 220 and the first energy storage component 210 are connected end to end.

[0064] The thermal system 300 is configured to heat the steam in the thermal system 300 in sequence through the third energy storage component 230, the second energy storage component 220 and the first energy storage component 210, so that the steam does work to generate electrical energy for input into the power grid.

[0065] The thermal system 300 and the fourth energy storage component 240 are connected end to end; so that the steam generated by the thermal system 300 is transported to the fourth energy storage component 240 for reheating after doing work, and the reheated steam is transported back to the thermal system 300 to do work and generate electrical energy for input into the power grid.

[0066] In the above embodiment, all the wind power and solar power generated by the wind and solar power station 100 will be input into the energy storage system 200. Specifically, the wind power and solar power can be respectively transmitted to the first energy storage component 210, the second energy storage component 220, the third energy storage component 230 and the fourth energy storage component 240, which has the effect of multi-level energy storage and maximizes the utilization rate of wind power and solar power.

[0067] The steam in the thermal system 300 can be heated sequentially by the third energy storage component 230, the second energy storage component 220, and the first energy storage component 210, thereby turning the steam in the thermal system 300 into superheated steam. This superheated steam is then input into the thermal system 300 to perform work and generate electricity. The steam that has performed work in the thermal system 300 is then input into the fourth energy storage component 240 for reheating. The reheated steam is then input back into the thermal system 300. This is equivalent to using the energy storage system 200 to sequentially superheat and reheat the steam in the thermal system 300, thereby improving the steam utilization rate and ensuring maximum energy utilization.

[0068] In addition, all the wind and solar power generated by the wind and solar power station 100 will be fed into the energy storage system 200. It is understandable that the wind and solar power, which are random and intermittent, do not need to be directly fed into the grid, thus avoiding direct impact on the grid. By adjusting the output of the energy storage system 200, the thermal system 300 can generate electricity in a more stable manner, and then the relatively stable electrical energy is fed into the grid without affecting the stable electrical energy in the grid.

[0069] Alternatively, it can be understood that regardless of the amount of wind and solar power generated by the wind and solar power station 100, it will be fed into the energy storage system 200 for energy storage, which can effectively avoid the generation of "waste electricity" and improve the utilization rate of resources.

[0070] Reference Figures 2 to 5 As shown, in one possible implementation, at least one of the first energy storage component 210, the second energy storage component 220, the third energy storage component 230, and the fourth energy storage component 240 includes a heat exchanger 211, a first storage tank 212, a second storage tank 213, and a heat release element 214.

[0071] The heat exchanger 211, the first storage tank 212, the heat release element 214, and the second storage tank 213 are connected end to end in sequence.

[0072] The low-temperature medium in the second storage tank 213 is heated by the heat exchanger 211, so that the low-temperature medium in the second storage tank 213 becomes a high-temperature medium and is stored in the first storage tank 212. Then, it is heated by the heat release element 214 and becomes a low-temperature medium and is stored in the second storage tank 213.

[0073] In the above embodiment, the heat exchanger 211, the first storage tank 212, the heat release element 214, and the second storage tank 213 are connected end to end to form a complete cycle of heat absorption, energy storage, heat release, and storage. The structure is compact and can both store and release energy.

[0074] Reference Figure 4 and Figure 5 As shown, in one possible implementation, the thermal system 300 includes a steam turbine unit 310, a generator 320, a condenser 330, and a deaerator 340.

[0075] The steam turbine unit 310, condenser 330 and deaerator 340 are connected in sequence. The steam turbine unit 310 is connected to the generator 320, which is used to connect to the power grid.

[0076] The heat release element 214 in the first energy storage component 210 is connected to the steam turbine unit 310, and the heat release element 214 in the fourth energy storage component 240 is connected to the steam turbine unit 310 end to end in sequence.

[0077] In the above embodiment, the steam in the thermal system 300 is heated sequentially by the heat release element 214 in the third energy storage component 230, the heat release element 214 in the second energy storage component 220, and the heat release element 214 in the first energy storage component 210 to form superheated steam. This superheated steam is then transported to the turbine unit 310 in the thermal system 300 to perform work, and the generated electricity is then fed into the power grid via the generator 320. This completes the power generation of the superheated steam. Next, the heat release element 214 in the fourth energy storage component 240 is connected to the turbine unit 310 end to end, so that the superheated steam after power generation is input into the heat release element 214 in the fourth energy storage component 240 for reheating to form reheated steam. This reheated steam is then re-input into the turbine unit 310 to perform power generation. This completes the power generation of the reheated steam. The steam that has undergone two power generation processes maximizes the utilization rate of the steam and makes full use of resources.

[0078] Furthermore, the turbine unit 310 is connected to the condenser 330. It is understood that if the superheated steam does not have a good reheat basis after being used to generate electricity by the turbine unit 310, it can be directly sent to the condenser 330 for condensation and become liquid before being input into the return water process of the thermal system 300. Alternatively, the reheated steam can also be input into the condenser 330 for condensation after being used to generate electricity by the turbine unit 310. The condensate output from the condenser 330 will be deoxygenated by the deaerator 340 and then input into the heat release element 214 in the third energy storage component 230. The deaerator 340 will remove oxygen and other gases dissolved in the return water process to prevent and reduce corrosion of various components and other auxiliary equipment in the energy storage system 200.

[0079] In one possible implementation, the thermal system 300 further includes a low-pressure heater assembly 350 and a high-pressure heater assembly 360.

[0080] Both the low-pressure heater group 350 and the high-pressure heater group 360 are connected to the turbine group 310.

[0081] Condenser 330, low-pressure heater group 350, deaerator 340 and high-pressure heater group 360 are connected in sequence.

[0082] In the above embodiments, the low-pressure heater group 350 and the high-pressure heater group 360 can heat the return water in the thermal system 300 to improve the heat recovery effect.

[0083] In one possible implementation, the thermal system 300 further includes a first de-cooling and pressure reducing device 361 and a second de-cooling and pressure reducing device 351.

[0084] The heat release element 214 in the first energy storage component 210, the first desuperheating and pressure reducing device 361, the high-pressure heater group 360, and the heat release element 214 in the third energy storage component 230 are connected in sequence; part of the steam heated by the heat release element 214 in the first energy storage component 210 can be input into the high-pressure heater group 360 through the first desuperheating and pressure reducing device 361.

[0085] The second desuperheater 351 is connected between the heat release element 214 in the fourth energy storage component 240 and the low-pressure heater group 350.

[0086] In the above embodiment, some of the superheated steam generated by the energy storage system 200 can be input into the high-pressure heater group 360 through the first desuperheater 361, and some of the reheated steam can be input into the low-pressure heater group 350 through the second desuperheater 351. On the one hand, when the pressure in the energy storage system 200 is too high and needs to be adjusted and released, the above-mentioned superheated steam and reheated steam circulation loop can facilitate the pressure regulation of the energy storage system 200 and avoid danger in the energy storage system 200. On the other hand, it can prevent pipeline rupture and improve safety.

[0087] In one possible implementation, the heat-releasing element 214 in the first energy storage component 210, the first desuperheating and pressure-reducing device 361, and the heat-releasing element 214 in the fourth energy storage component 240 are connected in sequence. Part of the steam heated by the first energy storage component 210 can also be input into the heat-releasing element 214 in the fourth energy storage component 240 through the first desuperheating and pressure-reducing device 361.

[0088] In the above embodiment, when the temperature and pressure of the superheated steam output by the heat release element 214 in the first energy storage component 210 are not up to standard, it can be directly input into the heat release element 214 in the fourth energy storage component 240 through the first desuperheating and pressure reducing device 361 for reheating to directly form reheated steam. The above process can reduce the energy loss of the substandard superheated steam, thereby maintaining the pressure and temperature stability in the energy storage system 200.

[0089] In one possible implementation, the thermal system 300 further includes a first water supply pump 362 and a second water supply pump 352.

[0090] The first feedwater pump 362 is connected between the deaerator 340 and the high-pressure heater group 360, and the second feedwater pump 352 is connected between the condenser 330 and the low-pressure heater group 350.

[0091] In the above embodiments, the first water pump 362 and the second water pump 352 can improve the smoothness of the return water process of the thermal system 300.

[0092] In one possible implementation, refer to Figure 5 As shown, the thermal system 300 also includes a condensate heater 370.

[0093] The condensate heater 370 is connected between the second feed water pump 352 and the low-pressure heater group 350.

[0094] In the above embodiments, it can be understood that the condensate directly output from the condenser 330 has a low temperature and is not suitable for direct input into the low-pressure heater group 350. By setting the condensate heater 370, it is equivalent to preheating the condensate output from the condenser 330, which helps to improve the working efficiency of the low-pressure heater group 350.

[0095] In one possible implementation, the heat-releasing element 214 of the first energy storage component 210 is a superheater, the heat-releasing element 214 of the second energy storage component 220 is an evaporator, the heat-releasing element 214 of the third energy storage component 230 is a feedwater heater, and the heat-releasing element 214 of the fourth energy storage component 240 is a reheater.

[0096] The water heater, evaporator, superheater, and thermal system 300 are connected in sequence from beginning to end.

[0097] In the above embodiment, the return water of the thermal system 300 is first heated by the feed water heater, and then heated by the evaporator and superheater to form superheated steam with higher temperature and pressure. The sequential connection of the feed water heater, evaporator and superheater helps to improve the heat recovery effect.

[0098] In one possible implementation, the medium in at least one of the first energy storage component 210 and the fourth energy storage component 240 is molten salt, the medium in the second energy storage component 220 is either molten salt or oil, and the medium in the third energy storage component 230 is either oil or water.

[0099] In the above embodiments, the first energy storage component 210 or the fourth energy storage component 240 utilizes molten salt energy storage, which features high thermal efficiency, good heat transfer performance, and high safety. Furthermore, the operating temperature of molten salt energy storage is between 290℃ and 565℃, making it suitable for first steam with both high pressure and temperature, ensuring maximum heat exchange efficiency. It is understood that the relative temperatures of the high-temperature media in the first storage tank 212 of the third energy storage component 230, the second energy storage component 220, and the first energy storage component 210 increase sequentially, and the suitable temperatures for water, oil, and molten salt also increase sequentially, thus reducing costs while ensuring reasonable energy storage.

[0100] It should be noted that the low-pressure heater group 350 and high-pressure heater group 360 mentioned above are related technologies in this field, and their connection relationships with other components are not limited except for the limitations mentioned in this application.

[0101] In one possible implementation, refer to Figures 2 to 5 As shown in the attached diagram, to clearly illustrate the connection relationships between the wind and solar power station 100, the energy storage system 200, and the thermal system 300, straight lines with arrows are used to represent the connection relationships between the inlets and outlets of each system, such as... Figure 2 As shown, the outlets A of the wind and solar power generation of the wind power station 100 are connected to the inlet a of the heat exchanger 211 in the first energy storage component 210, the inlet a of the heat exchanger 211 in the second energy storage component 220, the inlet a of the heat exchanger 211 in the third energy storage component 230, and the inlet a of the heat exchanger 211 in the fourth energy storage component 240, respectively. The outlet B of the superheater in the first energy storage component 210 is connected to the inlet b of the turbine unit 310 in the thermal system 300. The outlet D of the turbine unit 310 is connected to the inlet d of the reheater. The outlet E of the reheater is connected to the inlet e of the turbine unit 310 in the thermal system 300. The outlet F of the high-pressure heater group 360 in the thermal system 300 is connected to the inlet f of the feedwater heater in the third energy storage component 230.

[0102] The outlet F of the superheater is connected to the inlet f of the second turbine unit 310, and the outlet G of the second high-pressure heater is connected to the inlet g of the feedwater heater.

[0103] The implementation principle of the all-electrode multi-gradient energy storage peak power generation system in this application embodiment is as follows: The all-electrode multi-gradient energy storage peak power generation system includes a wind and solar power station 100, an energy storage system 200, and a thermal system 300. The wind and solar power station 100 is connected to the energy storage system 200, and the energy storage system 200 is connected to the thermal system 300. All the wind and solar power generated by the wind and solar power station 100 is stored in the energy storage system 200. By adjusting the output of the energy storage system 200 and inputting it into the thermal system 300, a relatively stable power generation is achieved, effectively avoiding the impact of the randomness and intermittency of wind and solar power on the power grid. In addition, storing all the wind and solar power generated by the wind and solar power station 100 in the energy storage system 200 can improve the utilization rate of resources and avoid resource waste, thus solving the problem of unstable renewable energy power generation affecting the stability of the power grid and even causing resource waste.

[0104] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein.

[0105] This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The description and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0106] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A full electrode multi-gradient energy storage peak power generation system, characterized in that, The wind and light power station, the energy storage system and the thermal system are connected; the energy storage system is connected with the thermal system, and the thermal system is used for being connected with the power grid; the wind and light power station is configured to convert wind energy and light energy into wind power and light power and deliver to the energy storage system; the energy storage system comprises a first energy storage component, a second energy storage component, a third energy storage component and a fourth energy storage component, and the first energy storage component, the second energy storage component, the third energy storage component and the fourth energy storage component are configured to respectively absorb and convert the wind power and light power generated by the wind and light power station and store the energy of the wind power and light power; the thermal system, the third energy storage component, the second energy storage component and the first energy storage component are sequentially connected in sequence; the thermal system is configured to sequentially heat steam in the thermal system through the third energy storage component, the second energy storage component and the first energy storage component and make the steam work to generate electric energy for inputting into the power grid; the thermal system and the fourth energy storage component are sequentially connected in sequence; the steam generated by the thermal system is delivered to the fourth energy storage component for reheating after working, and the reheated steam is delivered to the thermal system for working to generate electric energy for inputting into the power grid; at least one of the first energy storage component, the second energy storage component, the third energy storage component and the fourth energy storage component comprises a heat exchanger, a first storage tank, a second storage tank and a heat releasing element; the heat exchanger, the first storage tank, the heat releasing element and the second storage tank are sequentially connected in sequence; low-temperature medium in the second storage tank is heated by the heat exchanger, so that the low-temperature medium in the second storage tank becomes high-temperature medium stored in the first storage tank, and then is discharged by the heat releasing element to become low-temperature medium stored in the second storage tank; the thermal system comprises a steam turbine unit, a generator, a condenser and a deaerator; the steam turbine unit, the condenser and the deaerator are sequentially connected in sequence, the steam turbine unit is connected with the generator, and the generator is used for being connected with the power grid; the heat releasing element in the first energy storage component is connected with the steam turbine unit, and the heat releasing element in the fourth energy storage component is sequentially connected with the steam turbine unit in sequence; the thermal system further comprises a low-pressure heater group and a high-pressure heater group; the low-pressure heater group and the high-pressure heater group are both connected with the steam turbine unit; the condenser, the low-pressure heater group, the deaerator and the high-pressure heater group are sequentially connected in sequence; the thermal system further comprises a first temperature and pressure reducer and a second temperature and pressure reducer; the heat releasing element in the first energy storage component, the first temperature and pressure reducer, the high-pressure heater group and the heat releasing element in the third energy storage component are sequentially connected in sequence; part of the steam heated by the heat releasing element in the first energy storage component can be input into the high-pressure heater group through the first temperature and pressure reducer; the second temperature and pressure reducer is connected between the heat releasing element in the fourth energy storage component and the low-pressure heater group. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The all-electrode multi-gradient energy storage peak generation system according to claim 1, characterized in that, ​ ​ ​ 3. The all-electrode multi-gradient energy storage peak power generation system according to claim 2, characterized in that, ​ ​ ​ 4. The all-electrode multi-gradient energy storage peak power generation system according to claim 3, characterized in that, The heat releasing part in the first energy storage assembly, the first desuperheater and the heat releasing part in the fourth energy storage assembly are sequentially communicated, and part of the steam heated by the first energy storage assembly can also be input into the heat releasing part in the fourth energy storage assembly through the first desuperheater.

5. The all-electrode multi-gradient energy storage peak power generation system of claim 2, wherein, The thermal system further comprises a first feed water pump and a second feed water pump; The first feed water pump is arranged in communication between the deaerator and the high-pressure heater group, and the second feed water pump is arranged in communication between the condenser and the low-pressure heater group.

6. The all-electrode multi-gradient energy storage peak generation system according to claim 5, characterized in that, The thermal system further comprises a condensate heater; The condensate heater is arranged in communication between the second feed water pump and the low-pressure heater group.

7. The all-electrode multi-gradient energy storage peak power generation system according to any one of claims 1 to 6, characterized in that, The heat releasing part in the first energy storage assembly is a superheater, the heat releasing part in the second energy storage assembly is an evaporator, the heat releasing part in the third energy storage assembly is a feed water heater, and the heat releasing part in the fourth energy storage assembly is a reheater; The feed water heater, the evaporator, the superheater and the thermal system are sequentially communicated in a loop.

8. The all-electrode multi-gradient energy storage peak power generation system according to claim 7, characterized in that, The medium in at least one of the first energy storage assembly and the fourth energy storage assembly is molten salt, the medium in the second energy storage assembly is one of molten salt and oil, and the medium in the third energy storage assembly is one of oil and water.

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