A solar photovoltaic and thermal integrated thermal power storage peak regulation system

Abstract

The present invention discloses a solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system, which mainly includes a solar photovoltaic power generation panel, a preheater, an evaporator, a compression-expansion integrated machine, a condenser, a high and low temperature water tank, a cooling tower and a plurality of water pumps connected by a series of pipelines. In order to achieve different operating conditions, in the present invention, a series of valves are arranged on the pipeline, and the two operating modes of charging and discharging can be realized by controlling the opening or closing state of all valves and water pumps. When the power consumption is low, a small amount of electric energy is consumed to store the waste heat to realize the charging operation mode; when the power consumption is high, the thermal energy is converted into electric energy for peak regulation to enter the discharge operation mode. The system of the present invention can directly utilize the waste heat of the solar photovoltaic backplane and effectively improve the photoelectric conversion efficiency of the solar photovoltaic panel. In addition, the integrated design of solar photovoltaic-compression heat pump-organic Rankine cycle not only achieves the purpose of peak regulation of the photovoltaic power generation system, but also reduces the economic cost of thermoelectric energy storage.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage and peak regulation, and in particular relates to a solar photovoltaic and thermal integrated thermoelectric energy storage and peak regulation system. Background Art

[0002] The country vigorously encourages the development and utilization of renewable energy and reduces the use of conventional energy to optimize my country's energy structure. In 2020, the country's renewable energy power generation reached 2214.8 billion kWh, of which solar photovoltaic power generation was 260.5 billion kWh, a year-on-year increase of 16.1%. Solar energy has strong volatility, so the increase in solar photovoltaic power generation has a greater demand for power storage capacity. Exploring a more flexible, low-cost and more efficient way of power storage is a hot issue in the current research field.

[0003] Nowadays, solar photovoltaic power generation still has problems such as low power generation efficiency and high cost. When sunlight shines on photovoltaic cell modules, only part of the energy is converted into electrical energy. The rest of the energy not only cannot be converted into electrical energy output, but also becomes waste heat, which reduces the efficiency of photovoltaic power generation. If the excess heat energy is recovered and utilized while solar photovoltaic power generation is in progress, it will not only have a cooling effect on the battery, improving its photovoltaic power generation efficiency and service life, but also greatly improve the comprehensive utilization efficiency of solar energy. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides a solar photovoltaic integrated thermal energy storage peak-shaving system based on compression heat pump-organic Rankine cycle power generation. The proposed system can directly utilize the waste heat of the solar photovoltaic backplane and effectively improve the photoelectric conversion efficiency of the solar photovoltaic power generation panel. In addition, the integrated design of solar photovoltaic-compression heat pump-organic Rankine cycle greatly reduces the economic cost of thermal energy storage and can also achieve the purpose of peak-shaving of the photovoltaic power generation system.

[0005] In order to solve the above technical problems, the present invention proposes a solar photovoltaic integrated thermal energy storage peak-shaving system, including a solar photovoltaic power generation panel, a preheater, an evaporator, a compression expansion machine, a condenser, a high-temperature water tank, a low-temperature water tank and a cooling tower; the solar photovoltaic power generation panel includes a waste heat recovery coil, the water outlet of the waste heat recovery coil is connected to the high-temperature side of the preheater through a water supply pipeline, and the low-temperature side of the preheater is connected to the water inlet of the waste heat recovery coil through a return water pipeline, and a water pump B1 is provided on the return water pipeline; a working medium inlet of the preheater is provided There is a working fluid pump; the working fluid outlet of the preheater is connected to the working fluid inlet of the evaporator, the working fluid outlet of the evaporator is connected to one end of the pipeline I, and the other end of the pipeline I is divided into two paths, G1 and G2, wherein the G1 pipeline is connected to the working fluid high-pressure port of the compression-expansion integrated machine, the G2 pipeline is connected to the working fluid inlet of the condenser, a tee A1 is provided on the G2 pipeline, and a G3 pipeline is connected between the working fluid low-pressure port of the compression-expansion integrated machine and the tee A1; a bypass is connected between the working fluid high-pressure port of the compression-expansion integrated machine and the working fluid inlet of the condenser P1; the working fluid outlet of the condenser is connected to the inlet of the working fluid pump through pipeline II; a bypass P2 is connected between the working fluid outlet of the condenser and the working fluid inlet of the preheater; the high temperature side of the evaporator is connected to the water outlet of the high temperature water tank through the S1 pipeline, and the water inlet of the high temperature water tank is connected to the high temperature side of the condenser through the S2 pipeline, a tee A2 is provided on the S2 pipeline, and an S3 pipeline is connected between the water inlet of the cooling tower and the tee A2; the low temperature side of the evaporator is connected to the water inlet of the low temperature water tank through the D1 pipeline, The water outlet of the low-temperature water tank is connected to the low-temperature side of the condenser through the D2 pipeline. A tee A3 is provided on the D2 pipeline, and the D3 pipeline is connected between the water outlet of the cooling tower and the tee A3; a water pump is respectively provided on the pipe sections on both sides of the tee A3 on the D1 pipeline and the D2 pipeline; a valve is respectively provided on the pipe sections on both sides of the tee A1 on the G1 pipeline and the G2 pipeline, the bypass P1, the bypass P2, the pipeline II, the S1 pipeline, the D1 pipeline, the S2 pipeline, the S3 pipeline, the D2 pipeline, and the D3 pipeline; a throttle valve is provided on the bypass P2.

[0006] Furthermore, the solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system described in the present invention controls the opening or closing status of all valves and the opening or closing status of all water pumps. When electricity consumption is low, it realizes a charging operation mode and consumes a small amount of electricity to store waste heat; when electricity consumption is peak, it realizes a discharging operation mode and converts thermal energy into electrical energy for peak regulation.

[0007] In the charging operation mode, the working fluid absorbs waste heat from the back plate of the solar photovoltaic panel in the preheater, is compressed in the compression-expansion machine, enters the condenser to exchange heat with the low-temperature water in the low-temperature water tank, is throttled by the throttle valve on the bypass P2, and enters the preheater for reciprocating circulation; the low-temperature water in the low-temperature water tank absorbs heat and is stored in the high-temperature water tank, thereby realizing efficient storage of low-temperature waste heat.

[0008] In the discharge operation mode, the working fluid absorbs the low-temperature waste heat generated by the back plate of the solar photovoltaic panel in the preheater, enters the evaporator to absorb the heat from the high-temperature water tank for further heating, and then expands through the compression and expansion machine to do work externally, so that the mechanical energy is converted into electrical energy. Then the working fluid enters the condenser to release heat, and is pressurized by the working fluid pump to enter the evaporator for reciprocating circulation; the high-temperature water in the high-temperature water tank releases heat and flows into the low-temperature water tank, and the cooling water in the cooling tower exchanges heat with the condenser, bringing the heat released by the working fluid back to the cooling tower for cooling, realizing a reciprocating cycle; when solar photovoltaic power generation cannot meet the requirements, supplementary power generation is carried out through the storage of low-temperature waste heat.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention proposes a new solar photovoltaic and photothermal integrated thermoelectric energy storage and peak-shaving system based on compression heat pump-organic Rankine cycle power generation. On the one hand, the waste heat generated by solar photovoltaic power generation is recycled and utilized to reduce the temperature of photovoltaic cells, thereby effectively improving the photoelectric conversion efficiency of solar photovoltaic panels. On the other hand, the integrated design of solar photovoltaic-compression heat pump-organic Rankine cycle can achieve energy storage and peak-shaving while reducing the investment cost of equipment to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the solar photovoltaic and thermal integrated thermoelectric energy storage peak regulation system of the present invention;

[0012] In the figure: 1-solar photovoltaic power generation panel, 2-preheater, 3-evaporator, 4-compression expansion machine, 41-working fluid high pressure port, 42-working fluid low pressure port, 5-condenser, 6-throttle valve, 7-working fluid pump, 8-high temperature water tank, 9-low temperature water tank, 10-cooling tower. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0014] The design idea of ​​the solar photovoltaic and thermal integrated thermal power storage peak-shaving system technical solution of the present invention is that the system includes two operating modes: charging mode and discharging mode. When the power consumption is low, the system enters the charging mode and stores the waste heat by consuming a small amount of electricity; when the power consumption is high, the power grid is often overloaded, and the system enters the discharging mode and converts thermal energy into electrical energy for peak regulation.

[0015] Charging operation mode: The waste heat generated by solar photovoltaic power generation is stored through a thermodynamic cycle. First, the working fluid undergoes a constant-pressure heat absorption process in the preheater, and after absorbing the low-temperature waste heat, it changes from a low-temperature, low-pressure gas to a high-temperature, low-pressure gas; then it passes through a compression-expansion machine for constant-entropy compression, and the working fluid changes from a high-temperature, low-pressure gas to a high-temperature, high-pressure gas; then the working fluid enters the condenser for a constant-pressure heat release process, and the high-temperature, high-pressure gaseous working fluid changes to a low-temperature, high-pressure liquid, and the low-temperature water in the low-temperature water tank absorbs the heat released by the condenser and stores it in the high-temperature water tank to facilitate the charging operation mode; finally, the working fluid changes from a low-temperature, high-pressure liquid to a low-temperature, low-pressure gas after adiabatic throttling. Through the above four processes of the thermodynamic cycle, heat is stored for use during peak electricity consumption periods.

[0016] Discharge operation mode: The waste heat generated by solar photovoltaic power generation is used to preheat the working fluid once through the preheater, and then the high-temperature water tank is used as a secondary heating heat source for the working fluid to heat it again. The working fluid converts thermal energy into electrical energy for peak regulation through the following four processes of the organic Rankine cycle. First, evaporation absorbs heat. The working fluid absorbs the waste heat from the solar photovoltaic backplane and the heat in the high-temperature water tank in the preheater and evaporator; then the working fluid enters the compression-expansion integrated machine to expand and perform external work, converting thermal energy into mechanical energy, and then generating electricity through mechanical energy; then it enters the condenser to realize the constant pressure heat release process, and a small amount of waste heat is cooled by cooling water from the cooling tower; finally, the working fluid is pressurized by the working fluid pump and enters the preheater. The above organic Rankine cycle converts thermal energy into electrical energy for peak regulation.

[0017] The specific implementation process of the present invention is further described in conjunction with the accompanying drawings.

[0018] Figure 1 The invention shows a solar photovoltaic integrated thermal energy storage peak-shaving system, which mainly includes a solar photovoltaic panel 1, a preheater 2, an evaporator 3, a compression-expansion integrated machine 4, a condenser 5, a high-temperature water tank 8, a low-temperature water tank 9 and a cooling tower 10 connected by a series of pipes. The connection relationship between the various parts is as follows:

[0019] The solar photovoltaic power generation panel 1 includes a waste heat recovery coil, the water outlet of the waste heat recovery coil is connected to the high temperature side of the preheater 2 through a water supply pipeline, and the low temperature side of the preheater 2 is connected to the water inlet of the waste heat recovery coil through a return water pipeline. A water pump B1 is provided on the return water pipeline; a working fluid pump 7 is provided at the working fluid inlet of the preheater 2.

[0020] The working fluid outlet of the preheater 2 is connected to the working fluid inlet of the evaporator 3, and the working fluid outlet of the evaporator 3 is connected to one end of the pipeline I, and the other end of the pipeline I is divided into two paths, G1 and G2, wherein the G1 pipeline is connected to the working fluid high-pressure port 41 of the compression-expansion machine 4, and the G2 pipeline is connected to the working fluid inlet of the condenser 5. A tee A1 is provided on the G2 pipeline, and a G3 pipeline is connected between the working fluid low-pressure port 42 of the compression-expansion machine 4 and the tee A1; a bypass P1 is connected between the working fluid high-pressure port 41 of the compression-expansion machine 4 and the working fluid inlet of the condenser 5; the working fluid outlet of the condenser 5 is connected to the inlet of the working fluid pump 7 through the pipeline II; a bypass P2 is connected between the working fluid outlet of the condenser 5 and the working fluid inlet of the preheater 2, and a throttle valve 6 is provided on the bypass P2.

[0021] The high temperature side of the evaporator 3 is connected to the water outlet of the high temperature water tank 8 through the S1 pipeline, and the water inlet of the high temperature water tank 8 is connected to the high temperature side of the condenser 5 through the S2 pipeline. A tee A2 is provided on the S2 pipeline, and an S3 pipeline is connected between the water inlet of the cooling tower 10 and the tee A2.

[0022] The low-temperature side of the evaporator 3 is connected to the water inlet of the low-temperature water tank 9 through the D1 pipeline, and the water outlet of the low-temperature water tank 9 is connected to the low-temperature side of the condenser 5 through the D2 pipeline. A tee A3 is provided on the D2 pipeline, and a D3 pipeline is connected between the water outlet of the cooling tower 10 and the tee A3.

[0023] A water pump is respectively provided on the pipe sections on both sides of the tee A3 on the D1 pipeline and the D2 pipeline; the water pump arranged on the D1 pipeline is denoted as water pump B2, the water pump arranged on the pipe section between the tee A3 and the low-temperature water tank (9) on the D2 pipeline is denoted as water pump B3, and the water pump arranged on the pipe section between the tee A3 and the cooling tower 10 on the D2 pipeline is denoted as water pump B4.

[0024] In order to achieve different operating conditions, in the present invention, a series of valves are provided on the pipeline, specifically: a valve V1 is provided on the G1 pipeline, a valve V2 is provided on the G2 pipeline on the pipe section between the tee A1 and the evaporator 3, a valve V4 is provided on the G2 pipeline on the pipe section between the tee A1 and the condenser 5, a valve V3 is provided on the bypass P1, a valve V5 is provided on the bypass P2, a valve V6 is provided on the pipeline II and upstream of the working fluid pump 7, a valve Y1 is provided on the S1 pipeline, a valve Y2 is provided on the D1 pipeline and upstream of the water pump B2, a valve Y3 is provided on the D2 pipeline and upstream of the water pump B3, a valve Y4 is provided on the S2 pipeline and on the pipe section between the tee A2 and the high-temperature water tank 8, a valve L1 is provided on the S3 pipeline, and a valve L2 is provided on the D3 pipeline and downstream of the water pump B4.

[0025] In the present invention, considering that the screening criteria for working fluids of heat pump and ORC system are similar, the same refrigerant is selected as the operating working fluid of the system. After comparison, R134a, R152a, R142b and other working fluids can be selected as the operating working fluid of the system of the present invention. The preheater 2, evaporator 3 and condenser 5 are all shell and tube heat exchangers, the compression expansion machine 4 is a twin-screw type, and the working fluid pump 7 and all water pumps are horizontal centrifugal pumps. The cooling tower 10 is an open cooling tower.

[0026] The system of the present invention can be used to adjust power generation according to local power consumption conditions. When the power consumption is at a low point, the system can store excess heat. When the power consumption is at a peak point, the system can convert the stored heat into electrical energy to relieve the pressure on the power grid. The specific plan is as follows.

[0027] By utilizing the solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system described in the present invention, by controlling the opening or closing status of all valves and the opening and closing of each water pump, a charging operation mode can be implemented during low electricity consumption, consuming a small amount of electricity to store waste heat; during peak electricity consumption, the power grid is often overloaded, and the system can implement a discharging operation mode to convert thermal energy into electrical energy for peak regulation.

[0028] The first situation is when the solar photovoltaic power generation can meet the electricity demand, when entering the charging operation mode, the status of all valves and water pumps is: open valve V2, valve V3, valve V5, valve Y3 and valve Y4, start water pump B1 and water pump B3, and other valves and water pumps are in the closed state. In this mode, the low-temperature waste heat generated by the solar photovoltaic backplane is stored in the high-temperature water tank 8 by consuming a small amount of electricity through the heat pump cycle. The specific process is: in the charging operation mode, the working fluid absorbs the waste heat from the backplane of the solar photovoltaic power generation panel 1 in the preheater 2, and after being compressed in the compression-expansion integrated machine 4, it enters the condenser 5 to exchange heat with the low-temperature water in the low-temperature water tank 9, and enters the preheater 2 for reciprocating circulation after throttling through the throttle valve 6 on the bypass P2; the low-temperature water in the low-temperature water tank 9 absorbs heat and is stored in the high-temperature water tank 8, thereby realizing efficient storage of low-temperature waste heat.

[0029] In the second case, when solar photovoltaic power generation cannot meet the electricity demand and enters the discharge operation mode, the status of all valves and water pumps is: open valve Y1, valve Y2, valve V1, valve V4, valve V6, valve L1 and valve L2, start circulating water pump B1 and circulating water pump B4, and other valves and water pumps are in the closed state. In this mode, the ORC power generation cycle converts thermal energy into mechanical energy to generate electrical energy. The specific process is as follows: in the discharge operation mode, the working fluid absorbs the low-temperature waste heat generated by the back plate of the solar photovoltaic panel 1 in the preheater 2, enters the evaporator 3 to absorb the heat from the high-temperature water tank 8 for further heating, and then expands through the compression-expansion integrated machine 4 to do work externally, so that the mechanical energy is converted into electrical energy, and then the working fluid enters the condenser 5 to release heat, and is pressurized by the working fluid pump 7 to enter the evaporator 3 for reciprocating circulation; the high-temperature water in the high-temperature water tank 8 releases heat and flows into the low-temperature water tank 9, and the cooling water in the cooling tower 10 exchanges heat with the condenser 5, and then brings the heat generated by the working fluid into the cooling tower 10 for cooling, and reciprocating circulation; when solar photovoltaic power generation cannot meet the requirements, it is used to supplement power generation through the storage of low-temperature waste heat. The solar photovoltaic and light-thermal integrated system not only improves the power generation efficiency of photovoltaic power generation, but also improves the comprehensive utilization efficiency of solar energy.

[0030] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many modifications without departing from the purpose of the present invention, all of which are within the protection of the present invention.

Claims

1. A solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system, comprising a solar photovoltaic power generation panel (1), a preheater (2), an evaporator (3), a compression-expansion integrated machine (4), a condenser (5), a high-temperature water tank (8), a low-temperature water tank (9) and a cooling tower (10), characterized in that: The solar photovoltaic power generation panel (1) comprises a waste heat recovery coil, the water outlet of the waste heat recovery coil is connected to the high temperature side of the preheater (2) through a water supply pipeline, the low temperature side of the preheater (2) is connected to the water inlet of the waste heat recovery coil through a return water pipeline, and a water pump B1 is provided on the return water pipeline; A working medium pump (7) is provided at the working medium inlet of the preheater (2); The working fluid outlet of the preheater (2) is connected to the working fluid inlet of the evaporator (3), the working fluid outlet of the evaporator (3) is connected to one end of the pipeline I, and the other end of the pipeline I is divided into two paths, G1 and G2, wherein the G1 pipeline is connected to the working fluid high-pressure port (41) of the compression-expansion machine (4), the G2 pipeline is connected to the working fluid inlet of the condenser (5), a tee A1 is provided on the G2 pipeline, and a G3 pipeline is connected between the working fluid low-pressure port (42) of the compression-expansion machine (4) and the tee A1; a bypass P1 is connected between the working fluid high-pressure port (41) of the compression-expansion machine (4) and the working fluid inlet of the condenser (5); the working fluid outlet of the condenser (5) is connected to the inlet of the working fluid pump (7) through the pipeline II; and a bypass P2 is connected between the working fluid outlet of the condenser (5) and the working fluid inlet of the preheater (2); The high-temperature side of the evaporator (3) is connected to the water outlet of the high-temperature water tank (8) via the S1 pipeline, and the water inlet of the high-temperature water tank (8) is connected to the high-temperature side of the condenser (5) via the S2 pipeline. A tee A2 is provided on the S2 pipeline, and an S3 pipeline is connected between the water inlet of the cooling tower (10) and the tee A2; The low-temperature side of the evaporator (3) is connected to the water inlet of the low-temperature water tank (9) via a D1 pipeline, and the water outlet of the low-temperature water tank (9) is connected to the low-temperature side of the condenser (5) via a D2 pipeline. A tee A3 is provided on the D2 pipeline, and a D3 pipeline is connected between the water outlet of the cooling tower (10) and the tee A3; A water pump is provided on each of the two side pipe sections of the tee A3 on the D1 pipeline and the D2 pipeline; A valve is respectively provided on the two side pipe sections of the tee A1 on the G1 pipeline and the G2 pipeline, the bypass P1, the bypass P2, the pipeline II, the S1 pipeline, the D1 pipeline, the S2 pipeline, the S3 pipeline, the D2 pipeline, and the D3 pipeline; The bypass P2 is provided with a throttle valve (6).

2. The solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system according to claim 1 is characterized in that: The water pump arranged on the D1 pipeline is denoted as water pump B2, the water pump arranged on the pipe section between the tee A3 and the low-temperature water tank (9) on the D2 pipeline is denoted as water pump B3, and the water pump arranged on the pipe section between the tee A3 and the cooling tower (10) on the D2 pipeline is denoted as water pump B4; The valve on the G1 pipeline is denoted as valve V1. The valve on the G2 pipeline located between the tee A1 and the evaporator (3) is denoted as valve V2, and the valve on the G2 pipeline located between the tee A1 and the condenser (5) is denoted as valve V4. The valve on the bypass P1 is denoted as valve V3. The valve on the bypass P2 is denoted as valve V5. The valve on the pipeline II is denoted as valve V6, and the valve V6 is located upstream of the working fluid pump (7). The valve on the S1 pipeline is denoted as valve Y1. The valve on the D1 pipeline is denoted as valve Y2, and the valve Y2 is located upstream of the water pump B2. The valve on the pipeline D2 between the tee A3 and the low-temperature water tank (9) is denoted as valve Y3. The valve Y3 is located upstream of the water pump B3. The valve on the pipe section between the tee A2 and the high-temperature water tank (8) on the S2 pipe is denoted as valve Y4. The valve on the S3 pipeline is denoted as valve L1. The valve on the D3 pipeline is denoted as valve L2, and the valve L2 is located downstream of the water pump B4.

3. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 1 is characterized in that: Select any one of R134a, R152a and R142b as the operating working fluid.

4. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 1 is characterized in that: The preheater (2), evaporator (3) and condenser (5) are all shell and tube heat exchangers.

5. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 1 is characterized in that: The integrated compression and expansion machine (4) is of a twin-screw type.

6. The solar photovoltaic and thermal integrated thermoelectric energy storage peak-shaving system according to claim 1 is characterized in that: The working fluid pump (7) and all water pumps are horizontal centrifugal pumps.

7. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 1 is characterized in that: The cooling tower (10) is an open cooling tower.

8. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 2 is characterized in that: By controlling the opening or closing status of all valves, the charging operation mode is realized when electricity consumption is low, consuming a small amount of electricity to store waste heat; when electricity consumption is peak, the discharging operation mode is realized, converting thermal energy into electrical energy for peak regulation.

9. The solar photovoltaic and thermal integrated thermal power storage peak-shaving system according to claim 8, characterized in that: When entering the charging operation mode, the status of all valves and water pumps is: open valve V2, valve V3, valve V5, valve Y3 and valve Y4, start water pump B1 and water pump B3, and other valves and water pumps are closed; In the charging operation mode, the working fluid absorbs waste heat from the back plate of the solar photovoltaic panel (1) in the preheater (2), is compressed in the compression-expansion integrated machine (4), enters the condenser (5) to exchange heat with low-temperature water in the low-temperature water tank (9), and enters the preheater (2) for reciprocating circulation after being throttled by the throttle valve (6) on the bypass P2; The low-temperature water in the low-temperature water tank (9) absorbs heat and is stored in the high-temperature water tank (8), thereby achieving efficient storage of low-temperature waste heat.

10. The solar photovoltaic and thermal integrated thermal power storage peak regulation system according to claim 8, characterized in that: When entering the discharge operation mode, the status of all valves and water pumps is: open valve Y1, valve Y2, valve V1, valve V4, valve V6, valve L1 and valve L2, start circulating water pump B1 and circulating water pump B4, and other valves and water pumps are closed; In the discharge operation mode, the working fluid absorbs low-temperature waste heat generated by the back plate of the solar photovoltaic panel (1) in the preheater (2), enters the evaporator (3) to absorb heat from the high-temperature water tank (8) for further heating, and then expands through the compression-expansion integrated machine (4) to perform external work, thereby converting mechanical energy into electrical energy. The working fluid then enters the condenser (5) to release heat, and is pressurized by the working fluid pump (7) to enter the evaporator (3) for reciprocating circulation; The high-temperature water in the high-temperature water tank (8) releases heat and flows into the low-temperature water tank (9), and the cooling water in the cooling tower (10) exchanges heat with the condenser (5), bringing the heat released by the working fluid back to the cooling tower (10) for cooling, thereby realizing a reciprocating cycle; when solar photovoltaic power generation cannot meet the requirements, supplementary power generation is performed by storing low-temperature waste heat.

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