A photovoltaic power station cooling system coupled with a waste incineration power station and a control method thereof

Abstract

The present invention relates to a photovoltaic power station cooling system coupled to a waste incineration power station. The system comprises a waste incineration power station and a photovoltaic power station, and further comprises: an absorption chiller connected to the mechanical ventilation cooling tower and flue gas heat exchanger of the waste incineration power station; a first circulating water pump installed between the flue gas heat exchanger and the absorption chiller; a second circulating water pump installed between the absorption chiller and the mechanical ventilation cooling tower; a photovoltaic cooling water circuit installed on the photovoltaic power station and connected to the absorption chiller; and a third circulating water pump installed on the photovoltaic cooling water circuit. The system uses the flue gas heat exchanger to recover waste heat from the flue gas at the tail end of the waste incineration boiler. The high-temperature circulating water generated by the flue gas heat exchanger serves as the heat source for the absorption chiller, thereby improving the energy utilization efficiency of the waste incineration power station. Simultaneously, the absorption chiller provides low-temperature cooling water for components in the photovoltaic power station, thereby improving the power generation efficiency and increasing the power generation capacity of the photovoltaic power station.

Description

Technical Field

[0001] The present invention relates to a cooling system for a photovoltaic power station, in particular to a cooling system for a photovoltaic power station coupled with a waste incineration power station and a control method thereof. Background Art

[0002] At present, the design outlet flue gas temperature of waste incineration waste heat boilers is 190℃~210℃. With the continuous improvement of living standards, the calorific value of domestic waste has gradually increased. At the same time, due to the presence of coking or ash accumulation inside the boiler, the outlet flue gas temperature of the waste heat boilers of some waste incineration power plants is higher than the design value. This part of energy is directly discharged into the environment through the chimney along with the flue gas, resulting in a decrease in the thermal efficiency of the entire plant and a waste of energy.

[0003] New solar photovoltaic power stations are being built within or near factories. These stations generate their own electricity for their own use, with surplus power going to the grid. They power some auxiliary equipment in waste incineration plants, reducing the plant's power consumption, while also providing some power directly to the grid, increasing grid-connected power generation. Because photovoltaic modules utilize sunlight wavelengths between 300nm and 1100nm through the thermoelectric effect, converting all other wavelengths into heat, they generate significant heat during operation. Research has shown that the efficiency of photovoltaic modules decreases linearly with increasing operating temperature, at a rate of approximately 0.5% per °C. For example, a photovoltaic module operating at 20°C will produce approximately 20% higher peak power than one operating at 70°C. This demonstrates the significant impact of temperature on photovoltaic modules. Therefore, cooling photovoltaic modules during operation is essential. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a photovoltaic power station cooling system coupled with a waste incineration power station and a control method thereof. First, the system uses a flue gas heat exchanger to recover the waste heat of the flue gas at the tail end of the waste incineration boiler. The high-temperature circulating water generated by the flue gas heat exchanger is used as the heat source for the absorption refrigeration machine, thereby improving the energy utilization efficiency of the waste incineration power station. At the same time, the absorption refrigeration machine provides low-temperature cooling water for the components in the photovoltaic power station. The power generation efficiency of the photovoltaic power station is improved and the power generation of the photovoltaic power station is increased. Secondly, a control method is proposed, which uses a controller to control the start and stop of each circulating water pump and the switch of the electric valve to achieve a rapid response of the photovoltaic power station cooling system and avoid the influence of poor cooling effect of the photovoltaic power station cooling system caused by the loss of cooling water caused by the cooling process of the components in the photovoltaic power station. The specific technical solution is:

[0005] A photovoltaic power station cooling system coupled with a waste incineration power station comprises a waste incineration power station and a photovoltaic power station, and further comprises: an absorption chiller, wherein the absorption chiller is respectively connected to a mechanical ventilation cooling tower and a flue gas heat exchanger of the waste incineration power station; a first circulating water pump, wherein the first circulating water pump is installed between the flue gas heat exchanger and the absorption chiller; a second circulating water pump, wherein the second circulating water pump is installed between the absorption chiller and the mechanical ventilation cooling tower; a photovoltaic cooling water circuit and a heat exchanger, wherein the photovoltaic cooling water circuit is installed on the photovoltaic power station, and the photovoltaic cooling water circuit is respectively connected to the absorption chiller and the heat exchanger; and a third circulating water pump, wherein the third circulating water pump is installed between the heat exchanger and the absorption chiller.

[0006] Preferably, the absorption chiller comprises a generator, a condenser, an evaporator and an absorber, the generator is connected to the flue gas heat exchanger, the absorber and the condenser are connected to the mechanical ventilation cooling tower, and the evaporator is connected to the photovoltaic cooling water circuit;

[0007] The absorption chiller uses the high-temperature circulating water at the outlet of the flue gas heat exchanger as a heat source, obtains the cooling water required by the photovoltaic cooling water circuit through the evaporator, and the waste heat generated by the condenser and absorber is taken away by the circulating water in the mechanical ventilation cooling tower.

[0008] Preferably, the photovoltaic cooling water circuit includes: branch pipes, the number of which is at least two

[0009] Preferably, the waste incineration power plant includes a waste incineration boiler, a bag dust collector, a flue gas heat exchanger and a chimney connected in sequence, and also includes: a generator, a mechanical ventilation cooling tower and a steam turbine, a condenser, a low-pressure heater and a deaerator connected in sequence, wherein the steam turbine is connected to the waste incineration boiler and the generator, the deaerator is connected to the waste incineration boiler, and the mechanical ventilation cooling tower is connected to the condenser.

[0010] A method for controlling a cooling system of a photovoltaic power station coupled to a waste incineration power station comprises the following steps:

[0011] Get the temperature displayed by the temperature sensor and the irradiance displayed by the irradiance sensor;

[0012] When the displayed temperature is greater than the preset temperature and the irradiance is greater than the preset irradiance, the first controller controls the first circulating water pump, the second circulating water pump, and the third circulating water pump to start, the flue gas heat exchanger, the absorption chiller, and the heat exchanger to start working, and the photovoltaic power station cooling system starts to start;

[0013] When the temperature sensor shows that the temperature is lower than the preset temperature, or the irradiance sensor shows that the irradiance is lower than the preset irradiance, the first controller controls the first circulating water pump, the second circulating water pump and the third circulating water pump to be shut down, the flue gas heat exchanger, the absorption chiller and the heat exchanger to stop working, and the photovoltaic power station cooling system is shut down.

[0014] Preferably, the method further includes the following steps: obtaining the three most recent flow sampling signals Qm1, Qm2, and Qm3 recorded by the flow sensor, and calculating ΔQ1=Qm1-Qm2, and ΔQ2=Qm2-Qm3;

[0015] When Qm1>Qm2>Qm3 or ΔQ2>ΔQ1, the electric valve is controlled to open by the second controller, and cooling water is replenished to the photovoltaic power station cooling system through the replenishing water tank; otherwise, the electric valve is controlled to close by the second controller, and the replenishing water tank stops replenishing cooling water to the photovoltaic power station cooling system.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The flue gas heat exchanger is used to recover the waste heat of the flue gas at the tail end of the waste incineration boiler. The high-temperature circulating water generated by the flue gas heat exchanger is used as the heat source for the absorption refrigerator, realizing the waste heat utilization of the waste power station and improving the energy utilization efficiency of the waste incineration power station.

[0018] 2. Absorption chillers use the waste heat from the waste incineration power plant to provide low-temperature cooling water for the components in the photovoltaic power station, so that the photovoltaic components always operate within the temperature range with higher power generation efficiency, thereby improving the power generation efficiency of the photovoltaic power station and increasing the power generation of the photovoltaic power station.

[0019] 3. The hot water generated by cooling the components in the photovoltaic power station is first exchanged with the domestic water in the domestic hot water system in the plant. After the heat exchange, the condensed water returns to the absorption refrigerant. On the one hand, the waste heat of the hot water generated by cooling the components in the photovoltaic power station is effectively utilized, realizing the cascade utilization of energy. On the other hand, it also avoids the hot water generated by cooling the components in the photovoltaic power station from being too high in temperature and directly entering the absorption chiller, thereby reducing the cooling effect of the absorption chiller.

[0020] 4. The absorption chiller and the waste incineration power plant share a mechanical ventilation cooling tower, and their circulating cooling water pipelines are connected in parallel, saving equipment investment costs.

[0021] 5. The controller receives temperature and irradiation signals to control the start and stop of each circulating water pump, thereby achieving rapid response of the photovoltaic power station cooling system.

[0022] 6. The controller receives the flow signal and controls the opening and closing of the electric valve to avoid the poor cooling effect of the photovoltaic power station cooling system caused by the cooling water loss caused by the cooling process of the components in the photovoltaic power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram is a structural diagram of a photovoltaic power station cooling system coupled with a waste incineration power station.

[0024] Among them, 1-waste incineration boiler, 2-steam turbine, 3-generator, 4-condenser, 5-low-pressure heater, 6-deaerator, 7-bag dust collector, 8-flue gas heat exchanger, 9-chimney, 10-mechanical ventilation cooling tower, 11-absorption chiller, 111-generator, 112-condenser, 113-evaporator, 114-absorber, 12-first circulating pump, 13-second circulating water pump, 14-photovoltaic power station, 15-water inlet header, 16-water outlet header, 17-heat exchanger, 18-domestic hot water system in the plant, 19-electric valve, 20-third circulating water pump, 21-supplementary water tank, 22-first controller, 23-second controller, 24-temperature sensor, 25-irradiance sensor, 26-flow sensor. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Example

[0028] like Figure 1As shown, a photovoltaic power station cooling system coupled with a waste incineration power station includes a waste incineration power station, a photovoltaic power station 14, an absorption chiller 11, a first circulating water pump 12, a second circulating water pump 13, a third circulating water pump 20, an electric valve 19, a make-up water tank 21, a heat exchanger 17, a flow sensor 26, a temperature sensor 24, an irradiance sensor 25, a first controller 22 and a second controller 23.

[0029] The absorption chiller 11 is connected to the waste incineration plant's mechanical draft cooling tower 10 and flue gas heat exchanger 8, respectively. A first circulating water pump 12 is installed between the flue gas heat exchanger 8 and the absorption chiller 11. A second circulating water pump 13 is installed between the absorption chiller 11 and the mechanical draft cooling tower 10. A photovoltaic cooling water circuit is installed on the photovoltaic power station 14 and connects to the absorption chiller 11 and heat exchanger 17, respectively. A third circulating water pump 20 is installed between the heat exchanger 17 and the absorption chiller 11. The heat exchanger 17 is also connected to the plant's domestic hot water system 18. A make-up water tank 21 is connected to the heat exchanger 17 and the third circulating water pump 20. A motorized valve 19 is installed on the outlet pipe of the make-up water tank 21, and a flow sensor 26 is installed between the absorption chiller 11 and the third circulating water pump 20. A second controller 23 is electrically connected to the motorized valve 19 and flow sensor 26 to control the motorized valve 19 based on flow. The temperature sensor 24 and the irradiance sensor 25 are both installed on the photovoltaic power station 14; the first controller 22 is electrically connected to the temperature sensor 24, the irradiance sensor 25, the first circulating water pump 12, the second circulating water pump 13 and the third circulating water pump 20, respectively, and is used to control the first circulating water pump 12, the second circulating water pump 13 and the third circulating water pump 20 according to the temperature and irradiation intensity.

[0030] Specifically, the photovoltaic cooling water circuit includes branch pipes, an inlet header pipe 15, and an outlet header pipe 16. There are at least two branch pipes installed on the photovoltaic array of the photovoltaic power station 14. The inlet header pipe 15 is connected to one end of the branch pipe, and the outlet header pipe 16 is connected to the other end of the branch pipe. The inlet header pipe 15 is also connected to the outlet of the evaporator 113 in the absorption chiller 11. The outlet header pipe 16 is connected to the inlet of the evaporator 113 in the absorption chiller 11 through the heat exchanger 17.

[0031] Specifically, the waste incineration power station includes a waste incineration boiler 1, a bag dust collector 7, a flue gas heat exchanger 8 and a chimney 9 connected in sequence, and also includes: a generator 3, a mechanical ventilation cooling tower 10 and a steam turbine 2, a condenser 4, a low-pressure heater 5 and a deaerator 6 connected in sequence, wherein the steam turbine 2 is also connected to the waste incineration boiler 1 and the generator 3, the deaerator 6 is also connected to the waste incineration boiler 1, and the mechanical ventilation cooling tower 10 is connected to the condenser 4.

[0032] Specifically, absorption chiller 11 is a lithium bromide absorption chiller, a mature existing product. It comprises a generator 111, a condenser 112, an evaporator 113, and an absorber 114. Generator 111 is connected to flue gas heat exchanger 8, absorber 114 and condenser 112 are connected to the mechanical draft cooling tower 10, and evaporator 113 is connected to the photovoltaic cooling water circuit.

[0033] Specifically, the temperature sensor 24 is installed on the back of the photovoltaic module near the water inlet collecting pipe 15; the irradiance sensor 25 is installed in an open space in the photovoltaic power station 14, which is not blocked by objects and does not block the photovoltaic module.

[0034] The main working principles of the system are:

[0035] The condensed water, pressurized by the first circulating water pump 12, exchanges heat with the flue gas at the outlet of the bag filter 7 in the flue gas heat exchanger 8, generating high-temperature circulating water that serves as the heat source for the absorption chiller 11. This water then enters the generator 111 to heat the refrigerant-absorbent mixed solution, vaporizing the refrigerant in the mixed solution. The vaporized refrigerant then enters the condenser 112, releasing heat and condensing into high-pressure, low-temperature liquid refrigerant. The liquid refrigerant then enters the evaporator 113, where it evaporates and absorbs heat, cooling the condensed water from the outlet of the third circulating water pump 20. The resulting cooling water enters the photovoltaic cooling water circuit to cool the operating photovoltaic modules. The evaporated refrigerant in the evaporator 113 enters the absorber 114, where it is absorbed by the absorbent. The circulating cooling water from the mechanical draft cooling tower 10 enters the condenser 112 and absorber 114 in sequence, dissipating the excess heat generated in these condensers. This process effectively utilizes the waste heat of the flue gas at the tail end of the waste incineration boiler through an absorption chiller to produce low-temperature cooling water required for cooling the components in the photovoltaic power station. This not only realizes the waste heat utilization of the waste power station and improves the energy utilization efficiency of the waste incineration power station, but also cools the photovoltaic components in the photovoltaic power station so that the photovoltaic components always operate within a temperature range with high power generation efficiency, thereby improving the power generation efficiency of the photovoltaic power station and increasing the power generation of the photovoltaic power station. At the same time, the waste heat generated by the absorption chiller is released into the atmosphere through the mechanical ventilation cooling tower in the waste incineration power station. There is no need to add additional cooling towers and other equipment for the absorption chiller, which reduces the investment cost of equipment in system operation.

[0036] Furthermore, the hot water generated by cooling the photovoltaic power plant's components first enters heat exchanger 17 for heat exchange with domestic water from the plant's domestic hot water system. The condensed water is then pumped via third circulating water pump 20 to evaporator 113 of absorption chiller 11. This process prevents the excessively high temperature of the hot water generated by cooling the photovoltaic power plant's components from directly entering the absorption chiller, which would otherwise reduce its cooling efficiency. It also effectively utilizes the waste heat from the hot water generated by cooling the photovoltaic power plant's components, achieving cascaded energy utilization.

[0037] To ensure the normal operation of the above system, this embodiment also provides a control method for the cooling system of a photovoltaic power station coupled with a waste incineration power station, including a control method for the cooling system switch and a control method for water replenishment.

[0038] Cooling system control method:

[0039] Get the temperature displayed by the temperature sensor 24 and the irradiance displayed by the irradiance sensor 25;

[0040] When the displayed temperature is greater than the preset temperature and the irradiance is greater than the preset irradiance, the first controller 22 sends a signal to control the first circulating water pump 12, the second circulating water pump 13 and the third circulating water pump 20 to start, the flue gas heat exchanger 8, the absorption chiller 11 and the heat exchanger 17 to start working, and the cooling system of the entire photovoltaic power station 14 starts to start;

[0041] When the temperature sensor (24) indicates that the temperature is lower than the preset temperature, or the irradiance sensor (25) indicates that the irradiance is lower than the preset irradiance, a signal is sent through the first controller 22 to control the first circulating water pump 12, the second circulating water pump 13 and the third circulating water pump 20 to be turned off, the flue gas heat exchanger 8, the absorption chiller 11 and the heat exchanger 17 to stop working, and the cooling system of the entire photovoltaic power station 14 is turned off.

[0042] Specifically, in general, the photovoltaic modules in a photovoltaic power station have the highest power generation efficiency when the ambient temperature is 20℃-30℃, and the photovoltaic power station has the highest power generation efficiency when the irradiance is greater than 0W / m 2 Start generating electricity when the irradiance is less than 0W / m 2 Stop power generation, so the preferred preset temperature in this embodiment is 25°C, and the preferred preset irradiance is 0W / m 2 .

[0043] Through the control method of this cooling system, the photovoltaic power station cooling system can respond quickly, avoiding energy loss caused by the absorption chiller continuing to work when the photovoltaic power station stops working or the photovoltaic module temperature is not high.

[0044] Water replenishment control method:

[0045] The flow sensor 26 displays the flow rate Qm; the flow sensor 26 obtains the three most recent flow sampling signals Qm1, Qm2, and Qm3, and the second controller 23 calculates ΔQ1=Qm1-Qm2, ΔQ2=Qm2-Qm3;

[0046] When Qm1>Qm2>Qm3, or ΔQ2>ΔQ1, the second controller 23 sends a signal to control the electric valve 19 to open, and the supplementary water tank 21 starts to supplement cooling water to the cooling system of the photovoltaic power station; otherwise, the second controller 23 sends a signal to control the electric valve 19 to close, and the supplementary water tank 21 stops supplementing cooling water to the cooling system of the photovoltaic power station 14.

[0047] This water replenishment control method can avoid the impact of poor cooling effect of the photovoltaic power station cooling system caused by cooling water loss during the cooling process of components in the photovoltaic power station.

[0048] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for a photovoltaic power station cooling system coupled with a waste incineration power station, characterized in that: A photovoltaic power station cooling system coupled with a waste incineration power station comprises a waste incineration power station and a photovoltaic power station (14), and the system further comprises: An absorption refrigeration machine (11), the absorption refrigeration machine (11) being connected to a mechanical ventilation cooling tower (10) and a flue gas heat exchanger (8) of the waste incineration power plant respectively; a first circulating water pump (12), the first circulating water pump (12) being installed between the flue gas heat exchanger (8) and the absorption chiller (11); a second circulating water pump (13), the second circulating water pump (13) being installed between the absorption chiller (11) and the mechanical draft cooling tower (10); A photovoltaic cooling water circuit and a heat exchanger (17), wherein the photovoltaic cooling water circuit is installed on the photovoltaic power station (14), and the photovoltaic cooling water circuit is connected to the absorption refrigeration machine (11) and the heat exchanger (17) respectively; and a third circulating water pump (20), the third circulating water pump (20) being installed between the heat exchanger (17) and the absorption chiller (11); The system further comprises: a temperature sensor (24), the temperature sensor (24) being installed on the photovoltaic power station (14); an irradiance sensor (25), the irradiance sensor (25) being installed on the photovoltaic power station (14); and a first controller (22), the first controller (22) being electrically connected to the temperature sensor (24), the irradiance sensor (25), the first circulating water pump (12), the second circulating water pump (13), and the third circulating water pump (20), respectively, and being used to control the first circulating water pump (12), the second circulating water pump (13), and the third circulating water pump (20) according to temperature and irradiance intensity; The system further comprises: a flow sensor (26), the flow sensor (26) being installed between the absorption refrigeration machine (11) and the third circulating water pump (20); a second controller (23), the second controller (23) being electrically connected to the flow sensor (26) and the electric valve (19), respectively, and being used to control the electric valve (19) according to the flow rate; The method comprises the following steps: Obtaining the temperature displayed by the temperature sensor (24) and the irradiance displayed by the irradiance sensor (25); When the displayed temperature is greater than a preset temperature and the irradiance is greater than a preset irradiance, the first controller (22) controls the first circulating water pump (12), the second circulating water pump (13), and the third circulating water pump (20) to start, the flue gas heat exchanger (8), the absorption chiller (11), and the heat exchanger (17) to start working, and the cooling system of the photovoltaic power station (14) starts to start; When the temperature sensor (24) indicates that the temperature is less than a preset temperature, or the irradiance sensor (25) indicates that the irradiance is less than a preset irradiance, the first controller (22) controls the first circulating water pump (12), the second circulating water pump (13), and the third circulating water pump (20) to be turned off, the flue gas heat exchanger (8), the absorption chiller (11), and the heat exchanger (17) to stop working, and the cooling system of the photovoltaic power station (14) is turned off; The method further comprises the following steps: Obtain the three most recent flow sampling signals Qm1, Qm2, and Qm3 recorded by the flow sensor (26), and calculate ΔQ1=Qm1-Qm2, ΔQ2=Qm2-Qm3; When Qm1>Qm2>Qm3 or ΔQ2>ΔQ1, the electric valve (19) is controlled to open by the second controller (23), and cooling water is replenished to the cooling system of the photovoltaic power station (14) through the replenishing water tank (21); otherwise, the electric valve (19) is controlled to close by the second controller (23), and the replenishing water tank (21) stops replenishing cooling water to the cooling system of the photovoltaic power station (14).

2. The control method of a photovoltaic power station cooling system coupled with a waste incineration power station according to claim 1, characterized in that: The absorption refrigeration machine (11) comprises a generator (111), a condenser (112), an evaporator (113) and an absorber (114); the generator (111) is connected to the flue gas heat exchanger (8); the absorber (114) and the condenser (112) are connected to the mechanical ventilation cooling tower (10); and the evaporator (113) is connected to the photovoltaic cooling water circuit; The absorption refrigeration machine (11) uses the high-temperature circulating water at the outlet of the flue gas heat exchanger (8) as a heat source to obtain the cooling water required by the photovoltaic cooling water circuit through the evaporator (113), and the waste heat generated by the condenser (112) and the absorber (114) is taken away by the circulating water in the mechanical ventilation cooling tower (10).

3. The control method of a photovoltaic power station cooling system coupled with a waste incineration power station according to claim 2, characterized in that: The photovoltaic cooling water circuit includes: Branch pipes, the number of the branch pipes being at least two, and the branch pipes being installed on the photovoltaic array of the photovoltaic power station (14); a water inlet collecting pipe (15), the water inlet collecting pipe (15) being connected to one end of the branch pipe; and an outlet water collecting pipe (16), the outlet water collecting pipe (16) being connected to the other end of the branch pipe; The water inlet collecting pipe (15) is connected to the outlet of the evaporator (113); The water outlet collecting pipe (16) is connected to the inlet of the evaporator (113) via the heat exchanger (17).

4. The control method of a photovoltaic power station cooling system coupled with a waste incineration power station according to claim 1, characterized in that: The heat exchanger (17) is also connected to the domestic hot water system (18) within the factory.

5. The control method of a photovoltaic power station cooling system coupled with a waste incineration power station according to claim 1, characterized in that: Also includes: A supplementary water tank (21) and an electric valve (19), wherein the supplementary water tank (21) is connected to the heat exchanger (17) and the third circulating water pump (20), and the electric valve (19) is installed on the outlet pipeline of the supplementary water tank (21).

6. The control method of a photovoltaic power station cooling system coupled with a waste incineration power station according to claim 1, characterized in that: The waste incineration power plant comprises a waste incineration boiler (1), a bag filter (7), a flue gas heat exchanger (8) and a chimney (9) connected in sequence, and further comprises: a generator (3), a mechanical ventilation cooling tower (10) and a steam turbine (2), a condenser (4), a low-pressure heater (5) and a deaerator (6) connected in sequence, wherein the steam turbine (2) is connected to the waste incineration boiler (1) and the generator (3), the deaerator (6) is connected to the waste incineration boiler (1), and the mechanical ventilation cooling tower (10) is connected to the condenser (4).

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