A centralized energy storage power station heat dissipation system

Abstract

The present invention belongs to the field of energy storage technology, and relates to a centralized energy storage power station heat dissipation system, including: a plurality of battery compartments, a plurality of electric control compartments, a heat pump power storage system and a coolant storage tank; one of the battery compartments is electrically connected to an electric control compartment, and each of the electric control compartments is provided with a liquid cooling system, each of the liquid cooling systems is connected to the heat pump power storage system through a liquid cooling pipeline, and the heat pump power storage system is connected to the coolant storage tank through a liquid cooling pipeline, and the coolant storage tank provides coolant for the heat pump power storage system. It can improve the operating efficiency of large-scale centralized energy storage power station systems.

Description

Technical Field

[0001] The invention relates to a centralized energy storage power station heat dissipation system, belonging to the technical field of energy storage. Background Art

[0002] With the rapid increase in new energy installed capacity, the energy storage industry has also ushered in explosive growth. In order to alleviate the pressure on the operation of the power grid, the demand for the construction of large-scale centralized energy storage power stations on the grid side is also becoming increasingly strong. In the design of the heat dissipation solution of the energy storage system, it has gradually changed from the original air-cooled heat dissipation solution to the liquid-cooled heat dissipation solution, mainly because the latter can bring more precise temperature control and higher safety. However, the liquid-cooled heat dissipation solution is currently mainly used in the battery compartment in the energy storage system to dissipate heat from the battery module, and the air-cooled heat dissipation solution is still used on the converter in the electric control compartment.

[0003] Liquid cooling solutions for converters have been applied in wind turbines, which has greatly improved the temperature control performance of modules and converters. With the increase in the scale of energy storage system construction, the capacity of a single converter is also increasing rapidly. At present, the capacity of some models is equivalent to that of wind power converters. In the future, there is a trend of adopting liquid cooling solutions in the converter link of large-scale centralized energy storage power stations.

[0004] The development of phase change heat storage technology will be applied in the field of waste heat recovery, which will help improve the overall efficiency of the system. However, there is still little research on the combination of phase change heat storage technology and energy storage technology.

[0005] Existing technical solutions do not consider how to collect and utilize heat when designing the heat dissipation system of large-scale centralized energy storage power stations; the development of phase change heat storage technology has made progress, but there is still a gap in the application of combining it with electrochemical energy storage systems to improve the efficiency of energy storage systems. Summary of the invention

[0006] In view of the above problems, an object of the present invention is to provide a centralized energy storage power station heat dissipation system, which can improve the operating efficiency of a large-scale centralized energy storage power station system.

[0007] To achieve the above-mentioned purpose, the present invention proposes the following technical solutions: a centralized energy storage power station heat dissipation system, comprising: a plurality of battery compartments, a plurality of electrical control compartments, a heat pump power storage system and a coolant storage tank; one of the battery compartments is electrically connected to an electrical control compartment, and each of the electrical control compartments is provided with a liquid cooling system, each of the liquid cooling systems is connected to the heat pump power storage system through a liquid cooling pipeline, the heat pump power storage system is connected to the coolant storage tank through a liquid cooling pipeline, and the coolant storage tank is used to store coolant.

[0008] Furthermore, the AC side of the electric control cabin outputs AC current, which is boosted by a transformer and then incorporated into the power grid system.

[0009] Furthermore, the liquid cooling system is used to dissipate heat from the converter IGBT module of the electric control cabin, and the heat generated during the operation of the electric control cabin is recycled through phase change heat storage.

[0010] Furthermore, the grid-side inverter temperature of the electric control cabin is controlled below 120°C, and the cabinet temperature of the electric control cabin is controlled below 65°C.

[0011] Furthermore, the heat pump power storage system performs power storage and heat supply functions through a positive organic Rankine cycle or a reverse organic Rankine cycle.

[0012] Furthermore, the heat pump power storage system includes: an evaporator, a phase change heat storage device and a condenser, the evaporator includes two parallel pipelines, one pipeline is connected to the heat source, and the other pipeline is connected to the phase change heat storage device, and the condenser also includes two parallel pipelines, one pipeline is connected to the cold source, and the other pipeline is connected to the phase change heat storage device.

[0013] Furthermore, a heat pump cycle is performed between the evaporator and the phase change heat storage device, and an ORC (Organic Rankine Cycle) heat pump cycle is performed between the condenser and the phase change heat storage device.

[0014] Furthermore, both ends of the phase change heat storage device each include a three-way valve, and three outlets of the three-way valve are respectively connected to the phase change heat storage device, the evaporator and the condenser.

[0015] Furthermore, a compressor is arranged on a pipeline connecting one of the three-way valves to the evaporator, and the compressor is used to provide electric energy for the heat pump power storage system. An expansion valve is arranged on a pipeline connecting another of the three-way valves to the evaporator.

[0016] Furthermore, an expander is arranged on a pipeline connecting one of the three-way valves to the condenser, and the expander is used to output electric energy. A working fluid pump is arranged on a pipeline connecting another of the three-way valves to the condenser, and is used to drive the circulation of the working fluid.

[0017] The present invention adopts the above technical solution, which has the following advantages:

[0018] 1. The heat dissipation design scheme of the present invention combines the liquid cooling system of a large-scale centralized energy storage power station with the phase change heat storage technology, which can improve the operating efficiency of the energy storage system. Taking into account the trend of the single-unit capacity of the energy storage system converter gradually becoming larger, the liquid cooling heat dissipation technology of the energy storage converter will be applied, and the phase change heat storage technology is used to recycle the heat in the converter link of the energy storage system, thereby effectively improving the efficiency of the entire energy storage system.

[0019] 2. In the present invention, both the battery compartment and the electric control compartment adopt a liquid cooling solution to achieve more precise control of temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a centralized energy storage power station heat dissipation system in one embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of a heat pump power storage system in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail through specific embodiments. However, it should be understood that the provision of specific embodiments is only for a better understanding of the present invention, and they should not be understood as limitations of the present invention. In the description of the present invention, it should be understood that the terms used are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0023] In order to solve the problem that the prior art does not consider how to collect and utilize heat, and there is still a blank in the application of electrochemical energy storage systems combined with improving the efficiency of energy storage systems, the present invention proposes a centralized energy storage power station heat dissipation system, a number of battery compartments, a number of electric control compartments, a heat pump power storage system and a coolant storage tank; a battery compartment is electrically connected to an electric control compartment, and a liquid cooling system is arranged on each electric control compartment, each liquid cooling system is connected to the heat pump power storage system through a liquid cooling pipeline, and the heat pump power storage system is connected to the coolant storage tank through a liquid cooling pipeline, and the coolant storage tank is used to store coolant. The operating efficiency of the energy storage system can be improved. Considering the trend of the single-unit capacity of the energy storage system converter gradually increasing, the liquid cooling heat dissipation technology of the energy storage converter will be applied, and the phase change heat storage technology is used to recycle the heat of the energy storage system converter link, thereby effectively improving the efficiency of the entire energy storage system. The following is a detailed description of the scheme of the present invention through embodiments in conjunction with the accompanying drawings.

[0024] Definition of technical terms:

[0025] Energy storage system: in this embodiment, it specifically refers to a lithium iron phosphate battery energy storage system.

[0026] Battery compartment: refers to the prefabricated battery compartment on the DC side of the energy storage system, which mainly includes the battery system, battery rack, high-voltage box, junction cabinet, fire-fighting equipment, monitoring equipment, etc.

[0027] Electric control cabin: refers to the prefabricated cabin of the AC control system of the energy storage system, which mainly includes converters, transformers, etc.

[0028] Example:

[0029] This embodiment discloses a centralized energy storage power station heat dissipation system. Figure 1 As shown, it includes: a number of battery compartments, a number of electric control compartments, a heat pump power storage system and a coolant storage tank; a battery compartment is electrically connected to an electric control compartment, the AC side of the electric control compartment outputs AC current, which is boosted by a transformer and then connected to the power grid system, each electric control compartment is provided with a liquid cooling system, each liquid cooling system is connected to the heat pump power storage system through a liquid cooling pipeline, the heat pump power storage system is connected to the coolant storage tank through a liquid cooling pipeline, and the coolant storage tank is used to store coolant. Figure 1 In the system, both the battery compartment and the electric control compartment adopt liquid cooling solutions to achieve more precise temperature control. The optimal working environment temperature of lithium batteries in the battery compartment is generally around 25°C, and the temperature of the coolant used to cool the battery system generally does not exceed 30°C. Because the temperature is relatively low, it is difficult to collect and utilize it through heat storage technology; the liquid cooling system in the electric control compartment mainly dissipates heat for the converter IGBT module, the grid-side inverter temperature is generally controlled below 120°C, and the cabinet temperature is generally controlled below 65°C. The heat generated by the electric control compartment during operation is suitable for recycling through phase change heat storage.

[0030] The heat pump power storage system uses a positive organic Rankine cycle or a reverse organic Rankine cycle to store electricity and provide heat. The basic principle of the heat pump power storage system with a positive organic Rankine cycle or a reverse organic Rankine cycle is as follows: Figure 2 As shown in the figure, the system realizes the power storage function through the time-sharing switching operation of the heat pump cycle and ORC mode. In the application process, the cold end of ORC can be used as a heat source to realize the system's power storage and heating functions. Since the phase change process of the organic circulation medium is an isothermal process, in order to reduce the irreversible loss of heat transfer, the system uses phase change heat storage as the condensing end of the heat pump cycle and the evaporating end of the ORC cycle. The system involves multiple physical processes such as heat transfer processes such as medium-grade heat energy input, high-grade heat energy storage and release, and low-grade heat energy emission, as well as thermoelectric conversion. The transport, storage and conversion processes between different grades of energy have a strong coupling relationship.

[0031] like Figure 2As shown, the heat pump power storage system includes: an evaporator, a phase change heat storage device and a condenser. The evaporator includes two parallel pipelines, one pipeline is connected to the heat source, and the other pipeline is connected to the phase change heat storage device. The condenser also includes two parallel pipelines, one pipeline is connected to the cold source, and the other pipeline is connected to the phase change heat storage device. A heat pump cycle is performed between the evaporator and the phase change heat storage device, and an ORC heat pump cycle is performed between the condenser and the phase change heat storage device. Each end of the phase change heat storage device includes a three-way valve, and the three outlets of the three-way valve are respectively connected to the phase change heat storage device, the evaporator and the condenser. A compressor is arranged on the pipeline connected to the evaporator by a three-way valve, and the compressor is used to provide electrical energy for the heat pump power storage system. An expansion valve is arranged on the pipeline connected to the evaporator by another three-way valve. An expander is arranged on the pipeline connected to the condenser by a three-way valve, and the expander is used to output electrical energy. A working fluid pump is arranged on the pipeline connected to the condenser by another three-way valve, and is used to drive the working fluid circulation.

[0032] By combining the liquid cooling system of the energy storage power station with the heat pump power storage system, the waste heat of the energy storage power station can be recovered and can be used for power generation, or combined with the cold and heat storage facilities of the office building in the power station for hot and cold regulation, thereby improving the efficiency of the energy storage system.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be included in the protection scope of the claims of the present invention. The above content is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A centralized energy storage power station heat dissipation system, characterized in that: include: Several battery compartments, several electric control compartments, heat pump power storage systems and coolant storage tanks; A battery compartment is electrically connected to an electric control compartment, and each of the electric control compartments is provided with a liquid cooling system, each of the liquid cooling systems is connected to a heat pump power storage system through a liquid cooling pipeline, and the heat pump power storage system is connected to the coolant storage tank through a liquid cooling pipeline, and the coolant storage tank is used to store coolant; The heat pump power storage system includes: an evaporator, a phase change heat storage device and a condenser. The evaporator includes two parallel pipelines, one pipeline is connected to the heat source, and the other pipeline is connected to the phase change heat storage device. The condenser also includes two parallel pipelines, one pipeline is connected to the cold source, and the other pipeline is connected to the phase change heat storage device. The liquid cooling system is used to dissipate heat from the converter IGBT module of the electric control cabin. The heat generated by the electric control cabin during operation is recycled and utilized through phase change heat storage. The cabinet temperature of the electric control cabin is controlled below 65°C; The AC side of the electric control cabin outputs AC current, which is boosted by a transformer and then incorporated into the power grid system; the heat pump power storage system performs power storage and heat supply functions through a positive organic Rankine cycle or a reverse organic Rankine cycle.

2. The centralized energy storage power station heat dissipation system according to claim 1, characterized in that: A heat pump cycle is performed between the evaporator and the phase-change heat storage device, and an organic Rankine cycle is performed between the condenser and the phase-change heat storage device.

3. The centralized energy storage power station heat dissipation system according to claim 2, characterized in that: The two ends of the phase change heat storage device each include a three-way valve, and the three outlets of the three-way valve are respectively connected to the phase change heat storage device, the evaporator and the condenser.

4. The centralized energy storage power station heat dissipation system according to claim 3, characterized in that: A compressor is arranged on a pipeline connected to the evaporator by one of the three-way valves, and the compressor is used to provide electric energy for the heat pump power storage system. An expansion valve is arranged on a pipeline connected to the evaporator by another three-way valve.

5. The centralized energy storage power station heat dissipation system according to claim 3, characterized in that: An expander is arranged on a pipeline connected to the condenser by one of the three-way valves, and the expander is used to output electric energy. A working fluid pump is arranged on a pipeline connected to the condenser by another three-way valve, and is used to drive the circulation of the working fluid.

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