Wind-solar power generation deep refrigeration energy storage system and method

Abstract

The invention discloses a wind-solar power generation deep refrigeration energy storage system and method, and relates to the technical field of renewable energy source energy storage, the system comprises a wind power generation device, a photovoltaic power generation device, a deep refrigeration device, a cold storage device and a controller; the deep refrigeration device is connected with the wind power generation device, the photovoltaic power generation device and the cold storage device, and the wind power generation device and / or the photovoltaic power generation device supply power to the deep refrigeration device; the controller is connected with the wind power generation device, the photovoltaic power generation device and the deep refrigeration device. Power is supplied to the power grid through wind and light power generation or electric energy is stored through the cryogenic energy storage technology, the storage system is used for supplying power to the power grid, the stability of renewable energy power supply is improved, and the utilization efficiency of renewable energy is improved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy storage technology, and more specifically to a system and method for deep refrigeration energy storage using wind and solar power generation. Background Art

[0002] With the rapid development of renewable energy, the use of wind and solar energy is becoming more and more widespread. However, wind and solar energy are intermittent and unstable, which leads to unstable power generation and difficulty in directly connecting to the power grid. In order to solve this problem, it is necessary to develop efficient energy storage systems. Existing energy storage systems mainly include battery energy storage, pumped storage, etc., but these systems have problems such as high cost, low efficiency and great environmental impact.

[0003] Therefore, how to develop an efficient, environmentally friendly and economical energy storage system is an urgent problem that technicians in this field need to solve. Summary of the invention

[0004] In view of this, the present invention provides a wind-solar power generation deep refrigeration energy storage system and method, aiming to solve the problems existing in the existing energy storage system and achieve efficient, environmentally friendly and economical energy storage.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A wind-solar power generation deep refrigeration energy storage system, comprising: a wind power generation device, a photovoltaic power generation device, a deep refrigeration device, a cold storage device and a controller;

[0007] The deep refrigeration device is respectively connected to a wind power generation device, a photovoltaic power generation device and a cold storage device, and the wind power generation device and / or the photovoltaic power generation device provide power for the deep refrigeration device;

[0008] The controller is respectively connected to the wind power generation device, the photovoltaic power generation device and the deep refrigeration device.

[0009] The technical effect of the above technical scheme is that the wind power generation device converts wind energy into electrical energy, which is used for refrigeration in the deep refrigeration device; the photovoltaic power generation device is used to convert solar energy into electrical energy, which is used for refrigeration in the deep refrigeration device or connected to the grid through a controller to supply power to the grid; the deep refrigeration device is used to convert electrical energy and mechanical energy into cold energy and store it; the cold storage device is used to store cold energy; and the control system is used to control the operation of the entire system.

[0010] Preferably, the deep refrigeration device includes an air liquefaction module, a cold and hot cycle module and an expansion power generation module; the air liquefaction module compresses and cools the air to generate cold liquid which is transported to the cold storage device for storage; the expansion power generation module draws cold liquid from the cold storage device for expansion power generation; the cold and hot cycle module stores the heat energy generated during the air compression and cooling process for expansion power generation, and stores the cold energy generated during the expansion power generation process for air compression and cooling.

[0011] Preferably, the air liquefaction module includes an air purifier, an air compressor unit, a cooler, a refrigeration expander and a gas-liquid separator; the wind power generation device and / or the photovoltaic power generation device drives the air compressor unit to work through a motor, and supplies power to the air purifier, the cooler and the refrigeration expander; the air compressor unit compresses and boosts the air, the compressed air is purified and filtered through the air purifier, the purified compressed air is cooled through the cooler, the cooled air is cooled through the refrigeration expander, the output gas-liquid mixture is separated through the gas-liquid separator, and the cold liquid is transported to the cold storage device, and the cold air is returned to the refrigeration expander; the heat energy absorbed by the cooled air is transmitted to the cold and hot circulation module.

[0012] Preferably, the air compressor unit includes a main compressor and a booster compressor. The air is first compressed and pressurized by the main compressor and then delivered to the air purifier. The compressed air purified by the air purifier is pressurized to a preset pressure value by the booster compressor and then delivered to the cooler.

[0013] Preferably, the expansion power generation module includes a cryogenic pump, an evaporator, a heat exchanger and an expansion generator; cold liquid is extracted from the cold storage device by the cryogenic pump and transported to the evaporator; the evaporator vaporizes the cold liquid to generate cold air which is transported to the heat exchanger; the heat exchanger heats the cold air and transmits it to the expansion generator, and the cold energy obtained by heat exchange is transported to the cold and hot circulation module; the expansion generator uses the heated gas to expand and generate electricity, and outputs electrical energy.

[0014] Preferably, the hot and cold circulation module includes a heat storage tank, a cold storage tank, a cryogenic tank and a cold air pump; the heat storage tank is connected to the cooler and the heat exchanger, stores heat energy from the cooler, and supplies heat exchange to the heat exchanger; the cold storage tank is connected to the heat exchanger and the cooler, receives and stores cold energy from the heat exchanger through the cold air pump, and provides cold energy to the cooler; the cryogenic tank recovers the unvaporized cold liquid in the evaporator and transports it to the gas-liquid separator.

[0015] Preferably, the cold storage device includes a liquefied air storage tank, which stores cold liquid and is connected to a gas-liquid separator and a cryogenic pump.

[0016] Preferably, the heat storage tank and the cold storage tank use phase change materials or other high-efficiency energy storage media to achieve large-capacity, high-density cold / heat energy storage.

[0017] Preferably, the photovoltaic power generation device includes a solar panel, which collects solar energy and converts it into electrical energy to supply power to the deep refrigeration device or the power grid.

[0018] Preferably, the wind power generation device includes a wind wheel, a transmission structure and a generator. The wind wheel drives the generator through the transmission structure to convert mechanical energy into electrical energy, and the mechanical energy is converted into electrical energy to supply power to the deep refrigeration device or the power grid.

[0019] Preferably, the solar panels of the photovoltaic power generation device are arranged on the blades of the wind wheel of the wind power generation device, and the blades are fixed to the wind wheel by an adjustment component. The blade angle can be adjusted by the adjustment component to cater to the wind direction and the angle of sunlight. The wind wheel is fixed with a rotatable connection structure and can rotate horizontally to cater to the wind direction and light.

[0020] A deep refrigeration energy storage method for wind and solar power generation, comprising the following steps:

[0021] Step 1: Install and adjust wind power generation equipment and photovoltaic power generation equipment;

[0022] Step 2: The wind power generation device and the photovoltaic power generation device generate electric energy, and the controller controls the electric energy to be transmitted to the deep refrigeration device or the power grid;

[0023] Step 3: The deep refrigeration device uses electric energy to compress air for cooling and stores the cold energy in a cold storage device;

[0024] Step 5: The controller controls the dispatching of the cold storage device to transmit the cold energy back to the deep refrigeration device, converts the cold energy into electrical energy and transmits it to the power grid.

[0025] It can be known from the above technical solutions that compared with the prior art, the present invention discloses a deep refrigeration energy storage system and method for wind and solar power generation, which uses deep cold energy storage technology to convert electrical energy into the internal energy of liquid air and store it; when storing energy, the electrical energy compresses, cools and liquefies the air, and at the same time stores the heat energy released in the process, which is used to heat the air when releasing energy; when releasing energy, the liquid air is pressurized and gasified, driving the expander to generate electricity, and at the same time stores the cold energy of the process, which is used to cool the air when storing energy, effectively improving the energy storage efficiency. The system structure of the present invention is simple, and the operation and maintenance costs are low. Through the efficient use and storage of renewable energy, it can reduce dependence on traditional energy and reduce environmental pollution. In addition, the present invention can adjust the energy storage capacity according to demand and is suitable for renewable energy systems of different scales. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 1A schematic diagram of the structure of a wind-solar power generation deep refrigeration energy storage system provided by the present invention;

[0028] Figure 2 This is a schematic structural diagram of the deep refrigeration device provided by the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present invention discloses a deep refrigeration energy storage system for wind and solar power generation, such as Figure 1 As shown, it includes: a wind power generation device, a photovoltaic power generation device, a deep refrigeration device, a cold storage device and a controller;

[0031] The deep refrigeration device is respectively connected to the wind power generation device, the photovoltaic power generation device and the cold storage device, and the wind power generation device and / or the photovoltaic power generation device provide power for the deep refrigeration device;

[0032] The controller is respectively connected to the wind power generation device, the photovoltaic power generation device and the deep refrigeration device.

[0033] In the present invention, the wind power generation device converts wind energy into electrical energy, which is used for refrigeration in the deep refrigeration device; the photovoltaic power generation device is used to convert solar energy into electrical energy, which is used for refrigeration in the deep refrigeration device or connected to the grid through a controller to supply power to the grid; the deep refrigeration device is used to convert electrical energy and mechanical energy into cold energy and store it; the cold storage device is used to store cold energy; and the control system is used to control the operation of the entire system.

[0034] In a specific embodiment, Figure 2 As shown, the wind power generation device and / or the photovoltaic power generation device are used to power the deep refrigeration device, and the deep refrigeration device includes an air liquefaction module, a cold and hot cycle module, and an expansion power generation module; the air liquefaction module compresses and cools the air, generates cold liquid and transports it to the cold storage device for storage; the expansion power generation module extracts cold liquid from the cold storage device for expansion power generation; the cold and hot cycle module stores the heat energy in the air compression and cooling process for expansion power generation, and stores the cold energy in the expansion power generation process for air compression and cooling. The air liquefaction module is used to compress, cool and liquefy the air, and the heat energy released in this process is stored in the cold and hot cycle module. The expansion power generation module can use the heat energy in the cold and hot cycle module to pressurize and heat the liquefied air after liquefaction, and convert the cold energy into electrical energy, thereby supplying power to the power grid. In addition, the heat energy and cold energy in the energy storage process can be extracted for external heating or cooling, so as to realize the direct use of renewable energy.

[0035] Furthermore, the air liquefaction module includes an air purifier, an air compressor unit, a cooler, a refrigeration expander and a gas-liquid separator; the wind power generation device and / or the photovoltaic power generation device drives the air compressor unit to work and the air purifier, the cooler and the refrigeration expander to supply power through a motor; the air compressor unit compresses and boosts the air, the compressed air is purified and filtered through the air purifier, the purified compressed air is cooled through the cooler, the cooled air is cooled through the refrigeration expander, the output gas-liquid mixture is separated through the gas-liquid separator and the cold liquid is transported to the cold storage device, and the cold air is returned to the refrigeration expander; the heat energy absorbed by the cooled air is transmitted to the cold and hot circulation module.

[0036] Furthermore, the air compressor unit includes a main compressor and a booster compressor. The air is first compressed and pressurized by the main compressor and then transported to the air purifier. The compressed air purified by the air purifier is pressurized to a preset pressure value by the booster compressor and then transported to the cooler.

[0037] Furthermore, the expansion power generation module includes a cryogenic pump, an evaporator, a heat exchanger and an expansion generator; the cryogenic pump draws cold liquid from the cold storage device and transports it to the evaporator; the evaporator vaporizes the cold liquid to generate cold air which is transported to the heat exchanger; the heat exchanger heats the cold air and transmits it to the expansion generator, and the cold energy obtained by heat exchange is transported to the cold and hot circulation module; the expansion generator uses the heated gas to expand and generate electricity, and outputs electrical energy.

[0038] Furthermore, the hot and cold circulation module includes a heat storage tank, a cold storage tank, a cryogenic tank and a cold air pump; the heat storage tank is connected to the cooler and the heat exchanger, stores heat energy from the cooler, and supplies heat exchange to the heat exchanger; the cold storage tank is connected to the heat exchanger and the cooler, receives and stores cold energy from the heat exchanger through the cold air pump, and provides cold energy to the cooler; the cryogenic tank recovers the unvaporized cold liquid in the evaporator and transports it to the gas-liquid separator.

[0039] Furthermore, the cold storage device includes a liquefied air storage tank, which stores cold liquid and is connected to the gas-liquid separator and the cryogenic pump.

[0040] Furthermore, the heat storage tank and the cold storage tank use phase change materials or other high-efficiency energy storage media to achieve large-capacity, high-density cold / heat energy storage.

[0041] In this embodiment, the deep refrigeration device can fully utilize the heat energy during air compression, cooling, and liquefaction, as well as the cold energy during energy release, thereby effectively improving the energy storage efficiency.

[0042] In a specific embodiment, the photovoltaic power generation device includes a solar panel, which collects solar energy and converts it into electrical energy to supply power to a deep refrigeration device or a power grid; the wind power generation device includes a wind wheel, a transmission structure and a generator, and the wind wheel drives the generator through the transmission structure to convert mechanical energy into electrical energy.

[0043] Furthermore, the solar panels of the photovoltaic power generation device are arranged on the blades of the wind wheel of the wind power generation device. The blades are fixed to the wind wheel by an adjustment component. The blade angle can be adjusted by the adjustment component to cater to the wind direction and the angle of sunlight. The wind wheel is fixed with a rotatable connection structure, and the wind wheel can rotate horizontally to cater to the wind direction and light.

[0044] Furthermore, the wind wheel also includes a support frame, an adjustment component and a control component. One end of the blade is hinged to one end of the support frame and can rotate around the axis of the support frame. The adjustment component is used to adjust the angle between the blade and the axis of the support frame. At the same time, the support frame is also rotatably connected to the mounting frame that fixes the wind wheel in the photovoltaic power generation device, so that the wind wheel can rotate 360° in the horizontal direction. The control component is used to control the rotation angle of the adjustment component and the wind wheel. The rotation connection between the adjustment component and the wind wheel can cater to the wind direction and light angle, and improve the efficiency of wind and solar power generation.

[0045] On the other hand, a method for deep refrigeration energy storage of wind and solar power generation includes the following steps:

[0046] S1: Install and adjust wind power generation equipment and photovoltaic power generation equipment;

[0047] S2: The wind power generation device and the photovoltaic power generation device generate electric energy, and the controller controls the electric energy to be transmitted to the deep refrigeration device or the power grid;

[0048] S3: The deep refrigeration device uses electric energy to compress air for refrigeration and stores the cold energy in a cold storage device;

[0049] S5: The controller controls and dispatches the cold storage device to transmit the cold energy back to the deep refrigeration device, converts the cold energy into electrical energy and transmits it to the power grid.

[0050] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0051] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind and solar power generation deep refrigeration energy storage system, characterized in that: include: Wind power generation devices, photovoltaic power generation devices, deep refrigeration devices, cold storage devices and controllers; The deep refrigeration device is respectively connected to a wind power generation device, a photovoltaic power generation device and a cold storage device, and the wind power generation device and / or the photovoltaic power generation device provide power for the deep refrigeration device; The controller is respectively connected to the wind power generation device, the photovoltaic power generation device and the deep refrigeration device.

2. A wind-solar power generation deep refrigeration energy storage system according to claim 1, characterized in that: The deep refrigeration device includes an air liquefaction module, a hot and cold cycle module and an expansion power generation module; the air liquefaction module compresses and cools the air to generate cold liquid which is transported to the cold storage device for storage; the expansion power generation module draws cold liquid from the cold storage device for expansion power generation; the hot and cold cycle module stores the heat energy generated during the air compression and cooling process for expansion power generation, and stores the cold energy generated during the expansion power generation process for air compression and cooling.

3. A wind-solar power generation deep refrigeration energy storage system according to claim 2, characterized in that: The air liquefaction module includes an air purifier, an air compressor unit, a cooler, a refrigeration expander and a gas-liquid separator; the air compressor unit compresses and boosts the air, the compressed air is purified and filtered through the air purifier, the purified compressed air is cooled through the cooler, the cooled air is cooled through the refrigeration expander, the output gas-liquid mixture is separated through the gas-liquid separator and the cold liquid is transported to the cold storage device, and the cold air is returned to the refrigeration expander; the heat energy absorbed by the cooled air is transmitted to the cold and hot circulation module.

4. A wind-solar power generation deep refrigeration energy storage system according to claim 3, characterized in that: The air compressor unit includes a main compressor and a booster compressor. The air is first compressed and pressurized by the main compressor and then transported to the air purifier. The compressed air purified by the air purifier is pressurized to a preset pressure value by the booster compressor and then transported to the cooler.

5. A wind-solar power generation deep refrigeration energy storage system according to claim 3, characterized in that: The expansion power generation module includes a cryogenic pump, an evaporator, a heat exchanger and an expansion generator; the cryogenic pump extracts cold liquid from the cold storage device and transports it to the evaporator; the evaporator vaporizes the cold liquid to generate cold air which is transported to the heat exchanger; the heat exchanger heats the cold air and transmits it to the expansion generator, and the cold energy obtained by heat exchange is transported to the cold and hot circulation module; the expansion generator uses the heated gas to expand and generate electricity, and outputs electrical energy.

6. A wind-solar power generation deep refrigeration energy storage system according to claim 5, characterized in that: The hot and cold circulation module includes a heat storage tank, a cold storage tank, a cryogenic tank and a cold air pump; the heat storage tank is connected to the cooler and the heat exchanger, stores heat energy from the cooler, and supplies heat exchange to the heat exchanger; the cold storage tank is connected to the heat exchanger and the cooler, receives and stores cold energy from the heat exchanger through the cold air pump, and provides cold energy to the cooler; the cryogenic tank recovers the unvaporized cold liquid in the evaporator and transports it to the gas-liquid separator.

7. A wind-solar power generation deep refrigeration energy storage system according to claim 5, characterized in that: The cold storage device includes a liquefied air storage tank, which stores cold liquid and is connected to a gas-liquid separator and a cryogenic pump.

8. The wind-solar power generation deep refrigeration energy storage system according to claim 1, characterized in that: The photovoltaic power generation device includes solar panels, which collect solar energy and convert it into electrical energy to supply power to the deep refrigeration device or the power grid; the wind power generation device includes a wind wheel, a transmission structure and a generator. The wind wheel drives the generator through the transmission structure to convert mechanical energy into electrical energy to supply power to the deep refrigeration device or the power grid.

9. A wind-solar power generation deep refrigeration energy storage system according to claim 8, characterized in that: The solar panel is arranged on the blades of the wind wheel, and the blades are fixed on the wind wheel through an adjustment component, and the angle of the blades is adjusted by the adjustment component; the wind wheel is fixed by a rotatable connection structure.

10. A deep refrigeration energy storage method for wind and solar power generation, characterized in that: A wind-solar power generation deep refrigeration energy storage system applied to any one of claims 1-9 comprises the following steps: Step 1: Install and adjust wind power generation equipment and photovoltaic power generation equipment; Step 2: The wind power generation device and the photovoltaic power generation device generate electric energy, and the controller controls the electric energy to be transmitted to the deep refrigeration device or the power grid; Step 3: The deep refrigeration device uses electric energy to compress air for cooling and stores the cold energy in a cold storage device; Step 5: The controller controls the dispatching of the cold storage device to transmit the cold energy back to the deep refrigeration device, converts the cold energy into electrical energy and transmits it to the power grid.

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