All-electrode multi-gradient energy storage peak power generation system

Abstract

The invention provides a full-electrode multi-gradient energy storage peak power generation system, and relates to the field of energy storage peak regulation technologies, and the full-electrode multi-gradient energy storage peak power generation system comprises a wind and light power station, an energy storage system and a thermodynamic system. The wind and light power station is connected with the energy storage system, the energy storage system is connected with the thermodynamic system, all wind power and photoelectric energy generated by the wind and light power station is stored in the energy storage system, and stable power generation is completed by adjusting output of the energy storage system and inputting the energy into the thermodynamic system. In addition, all wind power and photoelectric 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 is avoided, and the problems that unstable renewable energy power generation affects the stability of the power grid and even causes resource waste are solved.

Description

Technical Field

[0001] This application relates to the technical field of energy storage and peak shaving, and particularly to a full-electrode multi-gradient energy storage peak power generation system. Background Art

[0002] At present, renewable energy sources such as wind energy and solar energy in China have been developing rapidly year by year. Coupled with the increasing annual electricity consumption of the whole society, the peak-valley difference of power grid electricity consumption is increasing day by day. It is becoming more and more important to maintain the stability of electric energy in the power grid.

[0003] In related technologies, wind power and photovoltaic power generated by wind energy and solar energy need to be input into the power grid together with thermal power generated by traditional coal-fired units; due to unstable factors such as wind volume and sunlight, wind power and photovoltaic power will be random and intermittent.

[0004] However, random and intermittent wind power and photovoltaic power will impact the power grid after being input into the power grid, affecting the stability and safety of the power grid. If not input into the power grid, it will cause waste of resources. Summary of the Invention

[0005] In view of this, this application provides a full-electrode multi-gradient energy storage peak power generation system, aiming to solve the problem that unstable renewable energy power generation affects the stability of the power grid and even causes waste of resources.

[0006] To achieve the above object, a full-electrode multi-gradient energy storage peak power generation system provided by this application adopts the following technical solutions:

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

[0008] The wind-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 be connected to the power grid;

[0009] The wind-solar power station is configured to convert wind energy and light energy into wind power and photovoltaic power and transport them into 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 respectively absorb and convert the wind power and photovoltaic power output by the wind-solar power station and store the energy of the wind power and photovoltaic power;

[0011] The thermal system, the third energy storage component, the second energy storage component, and the first energy storage component are connected in series in sequence;

[0012] The thermal system is configured to heat the steam in the thermal system and make it do work to generate electric energy for input into the power grid through the third energy storage component, the second energy storage component, and the first energy storage component in sequence;

[0013] The thermal system and the fourth energy storage component are connected in series at the head and tail; 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 electric energy for input into the power grid.

[0014] In a possible implementation manner, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, 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 includes a heat exchanger, a first storage tank, a second storage tank, and a heat release component;

[0015] The heat exchanger, the first storage tank, the heat release component, and the second storage tank are connected in series at the head and tail;

[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, and then releases heat through the heat release component and becomes a low-temperature medium and is stored in the second storage tank.

[0017] In a possible implementation manner, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the thermal system includes a steam turbine unit, a generator, a condenser, and a deaerator;

[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 be connected to the power grid;

[0019] The heat release component in the first energy storage component is connected to the steam turbine unit, and the heat release component in the fourth energy storage component is connected in series at the head and tail with the steam turbine unit.

[0020] In a possible implementation manner, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the thermal system further includes a low-pressure heater group and a high-pressure heater group;

[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 a possible implementation, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the thermal system further includes a first desuperheater and a second desuperheater;

[0024] The heat release element in the first energy storage component, the first desuperheater, the high-pressure heater group, and the heat release element in the third energy storage component are sequentially connected; a part of the steam heated by the heat release element in the first energy storage component can be input into the high-pressure heater group through the first desuperheater;

[0025] The second desuperheater is connected between the heat release element in the fourth energy storage component and the low-pressure heater group.

[0026] In a possible implementation, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the heat release element in the first energy storage component, the first desuperheater, and the heat release element in the fourth energy storage component are sequentially connected, and a part 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 through the first desuperheater.

[0027] In a possible implementation, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the thermal system further includes a first feed water pump and a second feed water pump;

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

[0029] In a possible implementation, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the thermal system further includes a condensate heater;

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

[0031] In a possible implementation, for the full-electrode multi-gradient energy storage peak power generation system provided by the present application, the heat release element of the first energy storage component is a superheater, the heat release element of the second energy storage component is an evaporator, the heat release element of the third energy storage component is a feed water heater, and the heat release element of the fourth energy storage component is a reheater;

[0032] The feed water heater, the evaporator, the superheater, and the thermal system are sequentially connected end to end.

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

[0034] The all-electrode multi-gradient energy storage peak power generation system provided by the present application includes: a wind-solar power station, an energy storage system, and a thermal system; the wind-solar power station is connected to the energy storage system, and the energy storage system is connected to the thermal system. All the energy of the wind power and photovoltaic power generated by the wind-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, relatively stable power generation is completed, effectively avoiding the impact of the randomness and intermittency of wind power and photovoltaic power on the power grid. In addition, all the energy of the wind power and photovoltaic power generated by the wind-solar power station is stored in the energy storage system, which can improve the utilization rate of resources and will not cause waste of resources, solving the problem that the unstable renewable energy power generation affects the stability of the power grid and even causes waste of resources.

[0035] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, the other technical problems that the all-electrode multi-gradient energy storage peak power generation system provided by the present application can solve, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present application, and the present application is not limited to the following specific implementation manners.

[0037] Figure 1 It is a schematic structural diagram of an all-electrode multi-gradient energy storage peak power generation system provided by an embodiment of the present application;

[0038] Figure 2 For indicating Figure 1 the connection structure schematic diagram of the wind-solar power station, the energy storage system, and the thermal system in

[0039] Figure 3 For Figure 2 the structural schematic diagram of the wind-solar power station in

[0040] Figure 4 For Figure 2 the structural schematic diagram of the energy storage system in

[0041] Figure 5 For Figure 2 the structural schematic diagram of the thermal system in

[0042] Description of the reference numerals in the drawings:

[0043] 100, wind-solar power station; 110, wind turbine generator set; 120, photovoltaic module;

[0044] 200, energy storage system; 210, first energy storage module; 211, heat exchanger; 212, first storage tank; 213, second storage tank; 214, heat release component; 220, second energy storage module; 230, third energy storage module; 240, fourth energy storage module;

[0045] 300, thermal system; 310, steam turbine unit; 320, generator; 330, condenser; 340, deaerator; 350, low-pressure heater group; 351, second desuperheating and pressure-reducing valve; 352, second feed water pump; 360, high-pressure heater group; 361, first desuperheating and pressure-reducing valve; 362, first feed water pump; 370, condensate heater.

[0046] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed embodiments

[0047] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0048] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0050] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically and precisely defined.

[0051] The terms "first", "second", "third", "fourth", etc. in the description, claims and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence.

[0052] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0053] As described in the background art, in the related art, the wind power and photovoltaic power generated by wind energy and solar energy need to be input into the power grid together with the thermal power generated by traditional coal-fired units; the wind volume and sunlight are unstable factors, resulting in randomness and intermittency of wind power and photovoltaic power. The random and intermittent wind power and photovoltaic power will impact the power grid after being input into the power grid, affecting the stability and safety of the power grid. If this part of the electric energy is not input into the power grid, it will become "waste electricity" and be discarded, causing waste of resources.

[0054] In addition, in the related art, when the wind volume and sunlight are sufficient, the production capacity of wind power and photovoltaic power is relatively high, and it is necessary to reduce the production capacity of coal-fired units, that is, to reduce the temperature and pressure output of the boiler. When the wind power and photovoltaic power decrease, it is necessary to increase the production capacity of coal-fired units at this time. When adjusting the temperature and pressure of the boiler, this process is slow, and the boiler cannot quickly change the internal pressure and temperature. A large adjustment of the temperature and pressure output of the boiler will also affect the stable power output to the power grid. A too large adjustment range of the pressure and temperature of the steam in the boiler may also cause damage to the boiler.

[0055] Based on the above technical problems, the embodiments of the present application provide a full-electrode multi-gradient energy storage peak power generation system. In this technical solution, a wind-solar power station is connected to an energy storage system, and the energy storage system is connected to a thermal system. All the energy of the wind power and photovoltaic power generated by the wind-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, relatively stable power generation is completed, effectively avoiding the impact of the randomness and intermittency of wind power and photovoltaic power on the power grid. In addition, all the energy of the wind power and photovoltaic power generated by the wind-solar power station is stored in the energy storage system, which can improve the utilization rate of resources and will not cause waste of resources, solving the problem that the unstable renewable energy power generation affects the stability of the power grid and even causes waste of resources.

[0056] It should be noted that Figures 1 to 5 schematically shows a simplified schematic diagram of each component in the full-electrode multi-gradient energy storage peak power generation system. The specific structure of the remaining components in the full-electrode multi-gradient energy storage peak power generation system is not limited to Figures 1 to 5 the illustration of.

[0057] The following will be a detailed description of the present application in conjunction with the accompanying drawings and specific embodiments:

[0058] Referring to Figure 1 and Figure 2 as shown, a full-electrode multi-gradient energy storage peak power generation system provided by the embodiments of the present application includes: a wind-solar power station 100, an energy storage system 200, and a thermal system 300.

[0059] The wind-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 be connected to the power grid.

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

[0061] The wind-solar power station 100 is configured to convert wind energy and light energy into wind power and photovoltaic power and transmit them into 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 respectively absorb and convert the wind power and photovoltaic power output by the wind-solar power station 100 and store the energy of the wind power and photovoltaic 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 in sequence.

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

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

[0066] In the above embodiment, the wind power and photovoltaic power generated by the wind-solar power station 100 will all be input into the energy storage system 200. Specifically, the wind power and photovoltaic power can be respectively transported 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, having the effect of multi-level energy storage and maximizing the utilization rate of wind power and photovoltaic power.

[0067] The steam in the thermal power system 300 can be heated 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 in the thermal power system 300 becomes superheated steam, is input into the thermal power system 300 to do work and generate electricity, and the steam after doing work in the thermal power system 300 will be input into the fourth energy storage component 240 for reheating, and the reheated steam will be re-input into the thermal power system 300, which is equivalent to using the energy storage system 200 to perform superheating and reheating treatments on the steam in the thermal power system 300 in sequence, improving the utilization rate of the steam and ensuring the maximization of energy utilization.

[0068] In addition, the wind power and photovoltaic power generated by the wind-solar power station 100 will all be input into the energy storage system 200. It can be understood that the wind power and photovoltaic power with randomness and intermittency do not need to be directly input into the power grid, avoiding direct impact on the power grid. By adjusting the output of the energy storage system 200, the thermal power system 300 can generate electricity more stably, and then input the relatively stable electric energy into the power grid without affecting the stable electric energy in the power grid.

[0069] Or it can be understood that no matter how much wind power and photovoltaic power are generated by the wind-solar power station 100, they will be input into the energy storage system 200 for energy storage, which can effectively avoid the generation of "garbage electricity" and improve the utilization rate of resources.

[0070] Refer to Figures 2 to 5 As shown, in a possible embodiment, 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 member 214.

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

[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, and then releases heat through the heat release component 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 component 214, and the second storage tank 213 are connected in series end to end to form a complete cycle of heat absorption, energy storage, heat release, and storage. The structure is compact, and it can not only complete energy storage but also complete energy release.

[0074] Refer to Figure 4 and Figure 5 As shown, in a possible implementation manner, 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, the condenser 330, and the deaerator 340 are connected in series in sequence. The steam turbine unit 310 is connected to the generator 320, and the generator 320 is used to be connected to the power grid;

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

[0077] In the above embodiment, the steam in the thermal system 300 is heated successively by the heat release component 214 in the third energy storage component 230, the heat release component 214 in the second energy storage component 220, and the heat release component 214 in the first energy storage component 210 to form superheated steam, which is transported to the steam turbine unit 310 in the thermal system 300 to do work, and is generated by the generator 320 and input into the power grid. Thus, the work done by the superheated steam for power generation is completed. Then, the heat release component 214 in the fourth energy storage component 240 is connected to the steam turbine unit 310 in series end to end, so that the superheated steam after doing work for power generation will be input into the heat release component 214 in the fourth energy storage component 240 for reheating to form reheated steam, and the reheated steam is re-input into the steam turbine unit 310 for doing work for power generation. Thus, the work done by the reheated steam for power generation is completed. The steam that has undergone two rounds of work for power generation can maximize the utilization rate of the steam and make full use of resources.

[0078] In addition, the steam turbine unit 310 is connected to the condenser 330. It can be understood that if the superheated steam does not have a good reheat basis after doing work and generating electricity through the steam turbine unit 310, it can also be directly transported to the condenser 330 for condensation, and then become liquid and be input into the return water process of the thermal system 300. Or, the reheated steam can also be input into the condenser 330 for condensation after doing work through the steam turbine unit 310. The condensed water output by the condenser 330 will undergo deaeration by the deaerator 340, and then be input into the heat release component 214 in the third energy storage component 230. The deaerator 340 will remove the oxygen and other gases dissolved in the return water process to prevent and reduce the corrosion of each component and other auxiliary equipment in the energy storage system 200.

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

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

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

[0082] In the above embodiment, 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 regenerative effect.

[0083] In a possible implementation manner, the thermal system 300 further includes a first desuperheating and pressure reducing valve 361 and a second desuperheating and pressure reducing valve 351.

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

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

[0086] In the above embodiment, a part of the superheated steam generated by the energy storage system 200 can be input into the high-pressure heater group 360 through the first desuperheating and pressure reducing valve 361, and a part of the reheated steam can be input into the low-pressure heater group 350 through the second desuperheating and pressure reducing valve 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 to avoid danger in the energy storage system 200. On the other hand, it can avoid pipeline rupture and improve safety.

[0087] In a possible implementation, the heat release component 214 in the first energy storage component 210, the first desuperheating and pressure reducing valve 361, and the heat release component 214 in the fourth energy storage component 240 are sequentially connected in series. A part of the steam heated by the first energy storage component 210 can also be input into the heat release component 214 in the fourth energy storage component 240 through the first desuperheating and pressure reducing valve 361.

[0088] In the above embodiment, when the temperature and pressure of the superheated steam output by the heat release component 214 in the first energy storage component 210 do not meet the standards, it can also be directly input into the heat release component 214 in the fourth energy storage component 240 through the first desuperheating and pressure reducing valve 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 a possible implementation, the thermal system 300 further includes a first feed water pump 362 and a second feed water pump 352.

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

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

[0092] In a possible implementation, referring to Figure 5 as shown, the thermal system 300 further includes a condensate heater 370.

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

[0094] In the above embodiment, it can be understood that the temperature of the condensate directly output from the condenser 330 is relatively low and is not suitable for directly inputting into the low-pressure heater group 350. By providing 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 a possible implementation, the heat release component 214 of the first energy storage component 210 is a superheater, the heat release component 214 of the second energy storage component 220 is an evaporator, the heat release component 214 of the third energy storage component 230 is a feed water heater, and the heat release component 214 of the fourth energy storage component 240 is a reheater.

[0096] The feed water heater, the evaporator, the superheater, and the thermal system 300 are connected in series end 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 the superheater to form superheated steam with a relatively high temperature and pressure. The sequential connection of the feed water heater, the evaporator, and the superheater helps to improve the regeneration effect.

[0098] In a 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 one of molten salt and oil, and the medium in the third energy storage component 230 is one of oil and water.

[0099] In the above embodiment, the first energy storage component 210 or the fourth energy storage component 240 using molten salt energy storage has the characteristics of high thermal efficiency, good heat transfer performance, and high safety. Moreover, the operating temperature of molten salt energy storage is between 290°C and 565°C, which can adapt to the first steam with relatively high pressure and temperature, ensuring the maximization of heat exchange efficiency. It can be understood that 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 have gradually increasing relative temperatures, and the suitable temperatures of water, oil, and molten salt also increase sequentially, which can reduce costs on the basis of ensuring reasonable energy storage.

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

[0101] In a possible implementation, referring to Figures 2 to 5 As shown, to clearly display the connection relationships between the wind-solar power station 100, the energy storage system 200, and the thermal system 300, in the drawings, straight lines with arrows are used to represent the connection relationships between the inlets and outlets of each system. As Figure 2 shown, the outlets A of the wind power and photovoltaic power generated by the wind-solar power station 100 are respectively 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. The outlet B of the superheater in the first energy storage component 210 is connected to the inlet b of the steam turbine unit 310 in the thermal system 300. The outlet D of the steam 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 steam 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 feed water heater in the third energy storage component 230.

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

[0103] The implementation principle of a full-electrode multi-gradient energy storage peak power generation system in an embodiment of this application is as follows: The full-electrode multi-gradient energy storage peak power generation system includes a wind-solar power station 100, an energy storage system 200, and a thermal system 300; the wind-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 energy of wind power and photovoltaic power generated by the wind-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, relatively stable power generation is completed, effectively avoiding the impact of the randomness and intermittency of wind power and photovoltaic power on the power grid. In addition, all the energy of wind power and photovoltaic power generated by the wind-solar power station 100 is stored in the energy storage system 200, which can improve the utilization rate of resources and will not cause waste of resources, solving the problem that unstable renewable energy power generation affects the stability of the power grid and even causes waste of resources.

[0104] Those skilled in the art will readily conceive of other embodiments of this application after considering the specification and the practice 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 known common knowledge or conventional technical means in the technical field not disclosed in this application. The specification and examples are only illustrative, and the true scope and spirit of this application are pointed out by the claims.

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

Claims

1. A full-electrode multi-gradient energy storage peak power generation system, characterized in that, Comprising: A wind-solar power station, an energy storage system, and a thermal system; The wind-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 configured to be connected to the power grid; The wind-solar power station is configured to convert wind energy and light energy into wind power and photovoltaic power and transmit them to the energy storage system; 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 respectively absorb and convert the wind power and photovoltaic power output by the wind-solar power station and store the energy of the wind power and photovoltaic power; The thermal system, the third energy storage component, the second energy storage component, and the first energy storage component are connected in series end to end; The thermal system is configured to heat the steam in the thermal system and make it do work to generate electric energy for input into the power grid through the third energy storage component, the second energy storage component, and the first energy storage component in sequence; The thermal system and the fourth energy storage component are connected in series 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 electric energy for input into the power grid.

2. The all-electrode multi-gradient energy storage peak power generation system according to claim 1, wherein 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 includes a heat exchanger, a first storage tank, a second storage tank, and a heat release component; The heat exchanger, the first storage tank, the heat release component, and the second storage tank are connected in series end to end; 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, and then releases heat through the heat release component and becomes a low-temperature medium and is stored in the second storage tank.

3. The all-electrode multi-gradient energy storage peak power generation system according to claim 2, characterized in that, The thermal system includes a steam turbine unit, a generator, a condenser, and a deaerator; 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 configured to be connected to the power grid; The heat release component in the first energy storage component is connected to the steam turbine unit, and the heat release component in the fourth energy storage component is connected in series end to end with the steam turbine unit.

4. The all-electrode multi-gradient energy storage peak power generation system according to claim 3, characterized in that The thermal system further includes a low-pressure heater group and a high-pressure heater group; Both the low-pressure heater group and the high-pressure heater group are connected to the steam turbine unit; The condenser, the low-pressure heater group, the deaerator, and the high-pressure heater group are connected in sequence.

5. The all-electrode multi-gradient energy storage peak power generation system according to claim 4, characterized in that The thermal system further includes a first desuperheating and pressure reducing valve and a second desuperheating and pressure reducing valve; The heat release component in the first energy storage component, the first desuperheating and pressure reducing valve, the high-pressure heater group, and the heat release component in the third energy storage component are connected in sequence; a part of the steam heated by the heat release component in the first energy storage component can be input into the high-pressure heater group through the first desuperheating and pressure reducing valve; The second desuperheating and pressure reducing valve is connected between the heat release component in the fourth energy storage component and the low-pressure heater group.

6. The all-electrode multi-gradient energy storage peak power generation system according to claim 5, wherein, The heat release component in the first energy storage assembly, the first desuperheater, and the heat release component in the fourth energy storage assembly are connected in sequence. Part of the steam heated by the first energy storage assembly can also be input into the heat release component in the fourth energy storage assembly through the first desuperheater.

7. The all-electrode multi-gradient energy storage peak power generation system according to claim 4, characterized in that The thermal system further includes a first feed water pump and a second feed water pump; The first feed water pump is connected and arranged between the deaerator and the high-pressure heater group, and the second feed water pump is connected and arranged between the condenser and the low-pressure heater group.

8. The all-electrode multi-gradient energy storage peak power generation system according to claim 7, characterized in that, The thermal system further includes a condensate heater; The condensate heater is connected and arranged between the second feed water pump and the low-pressure heater group.

9. The full-electrode multi-gradient energy storage peak power generation system according to any one of claims 2 to 8, characterized in that, The heat release component of the first energy storage assembly is a superheater, the heat release component of the second energy storage assembly is an evaporator, the heat release component of the third energy storage assembly is a feed water heater, and the heat release component of the fourth energy storage assembly is a reheater; The feed water heater, the evaporator, the superheater, and the thermal system are connected in sequence from start to end.

10. The all-electrode multi-gradient energy storage peak power generation system according to claim 9, 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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