Wind energy and solar energy combined cooling, heating, power and water supply system of offshore platform and control method

Abstract

The invention discloses a wind energy and solar energy combined cooling, heating, power and water supply system of an offshore platform and a control method, and relates to the technical field of wind energy and solar energy application of the offshore platform. When sunlight is sufficient, heat is supplied to the photoelectric heater through solar energy, cold and cold water are supplied through the steam injection refrigerating system, and when sunlight is insufficient, heat is supplied to the photoelectric heater through power supply of the wind power generation system. Power is supplied to the compressor to start the vapor compression refrigeration system to supply cold and cold water, and meanwhile power is directly supplied to users. The problem that cold supply, heat supply, power supply and water supply requirements of the offshore platform cannot be met when the sunlight condition is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore platform energy application, and in particular to a wind energy and solar energy combined cooling, heating, electricity and water supply system and a control method for an offshore platform. Background Art

[0002] At present, offshore oil drilling platforms, marine research stations and other facilities are far away from land, making the transportation and supply of traditional energy extremely inconvenient. Wind energy is a renewable and pollution-free energy source. Offshore wind resources are abundant and stable, with huge development potential and broad prospects.

[0003] Solar energy is a clean and renewable energy source. Using photoelectric heaters to provide heating on offshore platforms can significantly reduce the consumption of traditional energy and is environmentally friendly. The steam jet refrigeration system does not require electricity supply and can be driven by solar energy as a heat source. However, the offshore environment is complex and changeable, and the efficiency of photoelectric heaters is highly dependent on sunshine conditions. When there is insufficient sunshine, the photoelectric conversion rate will drop significantly, affecting the stable operation of the steam jet refrigeration system.

[0004] The steam compression refrigeration system is an efficient and stable refrigeration system driven by electricity. Therefore, by setting up wind turbines on offshore platforms, electricity can be generated to supply the steam compression refrigeration system, making up for the problem of reduced efficiency of the steam jet refrigeration system when the sunshine conditions are insufficient, and ensuring the supply of cooling capacity. Summary of the invention

[0005] The object of the present invention is to provide a wind and solar energy combined cooling, heating, electricity and water supply system and a control method for an offshore platform to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above tasks, the present invention provides a wind energy and solar energy combined cooling, heating, electricity and water supply system for an offshore platform, including a steam jet refrigeration system, the steam jet refrigeration system including a generator, an ejector, a condenser, a booster pump, a throttle valve and an evaporator, and the wind energy and solar energy combined cooling, heating, electricity and water supply system for an offshore platform also includes a photoelectric heater, a wind power generation system and a compressor; The photoelectric heater is connected to the generator through a water inlet port and a water outlet port, is used to supply hot water to the generator, and is powered by a wind power generation system; The high-pressure outlet of the compressor is connected to the inlet of the condenser and the outlet of the ejector respectively, and the low-pressure inlet is connected to the outlet of the evaporator and the injection port of the ejector respectively, and is powered by a wind power generation system; The wind power generation system includes a wind turbine generator set and a battery. The battery is electrically connected to the photoelectric heater, the compressor and the user distribution box respectively. A temperature control switch is provided on the circuit between the photoelectric heater and the battery. The temperature control switch is communicatively connected to the temperature sensor of the photoelectric heater.

[0007] The generator, ejector, condenser and booster pump in the steam jet refrigeration system are connected in sequence to form a circulation loop, and the inlet of the throttle valve is connected to the outlet of the condenser, the outlet of the throttle valve is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the injection port of the ejector, so that the ejector, condenser, throttle valve and evaporator are connected in sequence to form another circulation loop.

[0008] In order to control the circulation of the refrigerant in the steam jet refrigeration system, a stop valve 1 is provided on the pipeline between the ejector and the condenser, and a stop valve 3 is provided on the pipeline between the condenser and the booster pump. The selection of the steam jet refrigeration system is controlled by controlling the stop valve 1 and the stop valve 3.

[0009] In order to control the circulation of the refrigerant in the vapor compression refrigeration system, a stop valve 2 is provided on the pipeline between the high-pressure outlet of the compressor and the condenser, and a stop valve 4 is provided on the pipeline between the low-pressure inlet of the compressor and the evaporator. The selection of the vapor compression refrigeration system is controlled by controlling the stop valve 2 and the stop valve 4.

[0010] The high-pressure outlet of the compressor is connected to the inlet of the condenser and the outlet of the ejector through a tee, and the low-pressure inlet of the compressor is connected to the outlet of the evaporator and the injection port of the ejector through a tee.

[0011] The present invention also discloses a wind and solar energy combined cooling, heating, electricity and water supply control method for an offshore platform, which is used to control the above-mentioned combined cooling, heating, electricity and water supply system, and comprises the following steps: S1: Detect whether the temperature of the photoelectric heater is greater than a first set value, and determine whether the heating mode of the photoelectric heater is an electric heating mode or a solar heating mode; S2: If it is determined to be the electric heating mode, the temperature control switch is closed, the photoelectric heater is powered by the wind power generation system, the electric heating mode is entered, and the process returns to step S1, while directly entering the steam compression refrigeration mode; If it is determined to be the solar heating mode, the temperature control switch is turned off, the solar energy is used to heat the photoelectric heater, the solar heating mode is entered, heat is directly provided to the user, and the corresponding cooling mode is entered by executing step S3; S3: Detecting whether the temperature of the photoelectric heater is greater than a second set value, and determining whether the refrigeration mode of the refrigeration system is a steam injection refrigeration mode or a steam compression refrigeration mode; If it is determined to be the steam jet refrigeration mode, the booster pump, generator and ejector are started, so that the refrigerant medium in the pipeline enters the condenser and evaporator through the ejector, entering the steam jet refrigeration mode, and supplying cooling and cold water to users through the evaporator; If it is determined to be the steam compression refrigeration mode, the compressor is started by powering the wind power generation system, so that the refrigerant medium in the pipeline enters the condenser and evaporator through the compressor, entering the steam compression refrigeration mode, and supplying cooling and cold water to users through the evaporator.

[0012] In one working condition, the steam injection refrigeration mode is entered in step S3, and the following steps are further performed: Open stop valve 1 and stop valve 3, and close stop valve 2 and stop valve 4; The stop valve 1 is arranged on the pipeline between the ejector and the condenser, the stop valve 3 is arranged on the pipeline between the condenser and the booster pump, the stop valve 2 is arranged on the pipeline between the high-pressure outlet of the compressor and the condenser, and the stop valve 4 is arranged on the pipeline between the low-pressure inlet of the compressor and the evaporator.

[0013] In one operating condition, the steam compression refrigeration mode is entered in step S3, and the following steps are further performed: Close stop valve 1 and stop valve 3, and open stop valve 2 and stop valve 4; The stop valve 1 is arranged on the pipeline between the ejector and the condenser, the stop valve 3 is arranged on the pipeline between the condenser and the booster pump, the stop valve 2 is arranged on the pipeline between the high-pressure outlet of the compressor and the condenser, and the stop valve 4 is arranged on the pipeline between the low-pressure inlet of the compressor and the evaporator.

[0014] The first set value is adjusted according to the selection of the system refrigeration medium and the operating conditions of the offshore platform system. The first set value is 35-50°C.

[0015] According to the stable working temperature of the generator, the second set value is not less than 75°C.

[0016] The combined cooling, heating, electricity and water supply system of the present invention has the following effects: 1. The system can make full use of offshore wind resources and continuously generate electricity through wind turbines. On the one hand, this electricity can drive the steam compression refrigeration system to make up for the defect that the steam injection refrigeration system is difficult to operate stably due to the influence of sunlight conditions, and ensure the continuous cooling and cold water demand of the offshore platform; on the other hand, this electricity can be directly used as the energy source of the photoelectric heater to continuously generate high-temperature hot water to ensure the heating demand of the offshore platform; in addition, this electricity can be directly used as the power source of the offshore platform.

[0017] 2. When there is sufficient sunshine, the system can use the photovoltaic heater to generate heat for the offshore platform, and can also use solar energy to drive the steam jet refrigeration system to generate cold and fresh water for the offshore platform.

[0018] 3. The system's energy comes from wind and solar energy on the offshore platform. It does not require the consumption of traditional fossil energy and can achieve zero carbon emissions. At the same time, the system can greatly enhance the offshore platform's independent operation capabilities and solve the problem of the offshore platform's dependence on land energy supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic diagram of a steam jet refrigeration system; Figure 2 A schematic diagram of an embodiment of a wind and solar combined cooling, heating, electricity and water supply system for an offshore platform; Figure 3 A flow chart of a wind and solar combined cooling, heating, electricity and water supply control method for an offshore platform; 1. Generator; 2. Ejector; 3. Stop valve one; 4. Three-way one; 5. Condenser; 6. Three-way two; 7. Throttle valve; 8. Evaporator; 9. Three-way three; 10. Stop valve four; 11. Compressor; 12. Stop valve two; 13. Stop valve three; 14. Booster pump; 15. Battery; 16. Wind turbine; 17. Photoelectric heater; 18. User; 19. Temperature control switch. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1 See also Figure 2 The present embodiment provides a wind energy and solar energy combined heating, cooling, electricity and water supply system for an offshore platform, including a steam jet refrigeration system, the steam jet refrigeration system includes a generator 1, an ejector 2, a condenser 5, a booster pump 14, a throttle valve 7 and an evaporator 8, and the wind energy and solar energy combined heating, cooling, electricity and water supply system for an offshore platform also includes a photoelectric heater 17, a wind power generation system and a compressor 11.

[0023] The photoelectric heater 17 is connected to the generator 1 through a water inlet port and a water outlet port, and is used to supply hot water to the generator 1, and is powered by the wind power generation system.

[0024] The high-pressure outlet of the compressor 11 is connected to the inlet of the condenser 5 and the outlet of the ejector 2 respectively, and the low-pressure inlet is connected to the outlet of the evaporator 8 and the injection port of the ejector 2 respectively, and is powered by the wind power generation system.

[0025] The wind power generation system includes a wind turbine 16 and a battery 15, and the battery is electrically connected to the photoelectric heater 17, the compressor 11 and the user 18 distribution box respectively. A temperature control switch 19 is provided on the circuit between the photoelectric heater 17 and the battery 15, and the temperature control switch is communicatively connected to the temperature sensor of the photoelectric heater 17.

[0026] In this embodiment, the photoelectric heater 17 is an auxiliary electric heating pressurized solar water heater.

[0027] See also Figure 1 , wherein the generator 1, the ejector 2, the condenser 5, and the booster pump 14 in the steam jet refrigeration system are sequentially connected to form a circulation loop, and the outlet of the generator 1 is connected to the mainstream inlet of the ejector 2, the inlet of the throttle valve 7 is connected to the outlet of the condenser 5 through the three-way 6, the outlet of the throttle valve 7 is connected to the inlet of the evaporator 8, and the outlet of the evaporator 8 is connected to the injection port of the ejector 2, so that the ejector 2, the condenser 5, the throttle valve 7 and the evaporator 8 are sequentially connected to form another circulation loop, thereby forming a refrigeration loop, and supplying cooling and cold water to the user 18 through the evaporator 8.

[0028] See also Figure 2 In order to control the circulation of the refrigerant in the steam jet refrigeration system, a stop valve 1 3 is provided on the pipeline between the ejector 2 and the condenser 5, and a stop valve 3 13 is provided on the pipeline between the condenser 5 and the booster pump 14. The selection of the steam jet refrigeration system is controlled by controlling the stop valve 1 3 and the stop valve 3 13.

[0029] In order to control the circulation of the refrigerant in the vapor compression refrigeration system, a stop valve 2 12 is provided on the pipeline between the high pressure outlet of the compressor 11 and the condenser 5, and a stop valve 4 10 is provided on the pipeline between the low pressure inlet of the compressor 11 and the evaporator 8. The selection of the vapor compression refrigeration system is controlled by controlling the stop valve 1 3 and the stop valve 3 13.

[0030] The high-pressure outlet of the compressor 11 is connected to the inlet of the condenser 5 and the outlet of the ejector 2 through a tee 4, and the low-pressure inlet of the compressor 11 is connected to the outlet of the evaporator 8 and the injection port of the ejector 2 through a tee 9.

[0031] The power supply is provided by the wind power generator system, wherein the temperature of the photoelectric heater 17 is detected to control the closing and opening of the temperature control switch 19, thereby supplying power to or cutting off the power to the photoelectric heater 17, and the power supply to the compressor 11 and the user 18 is directly supplied by the storage battery 15 of the wind power generation system.

[0032] The heat is supplied by the photoelectric heater 17. When the sunshine condition is sufficient and the temperature of the photoelectric heater 17 is greater than 50°C, the temperature control switch 19 is turned off and hot water is directly supplied to the user 18. When the sunshine condition is insufficient and the temperature of the photoelectric heater 17 is less than 50°C, the temperature control switch 19 is closed and power is supplied to the photoelectric heater 17 through the wind power generation system until the temperature of the photoelectric heater 17 is greater than 50°C, then the temperature control switch 19 is turned off and hot water is supplied to the user 18.

[0033] Cooling and chilled water supply are supplied by: When the sunshine condition is sufficient and the temperature of the photoelectric heater 17 is greater than or equal to 75°C, the stop valve 1 3 and the stop valve 3 13 are opened, the stop valve 2 12 and the stop valve 4 10 are closed, the generator 1, the booster pump 14 and the ejector 2 are started, and the steam ejection refrigeration system is started. At this time, the refrigerant in the generator 1 is heated by the hot water in the photoelectric heater 17 and enters the ejector 2. The high-temperature and high-pressure refrigerant steam from the generator 1 and the low-temperature and low-pressure refrigerant steam from the evaporator 8 are mixed inside the ejector 2 to form medium-temperature and medium-pressure refrigerant steam. The medium-temperature and medium-pressure refrigerant steam is condensed into liquid refrigerant in the condenser 5; the liquid refrigerant is separated by the three-way 2 6, a part of the refrigerant liquid enters the booster pump 14 through the stop valve 3 13, and returns to the generator 1 after being pressurized in the booster pump 14; the other part of the refrigerant liquid enters the throttle valve 7, and enters the evaporator 8 after being decompressed by the throttle valve 7. The refrigerant liquid evaporates into refrigerant steam in the evaporator 8, and then returns to the ejector 2 through the three-way 3 9. The evaporator 8 is used to supply cooling to the offshore platform user 18. While supplying cooling, the evaporator in the refrigeration cycle exchanges heat with the air, and the air condenses when it is cold, thereby generating condensed water. The condensed water generated on the evaporator is collected and processed, and then transported to the user through the water supply pipeline to realize cold water supply.

[0034] When the sunshine condition is insufficient and the temperature of the photoelectric heater 17 is less than 75°C, the stop valve 1 3 and the stop valve 3 13 are closed, the stop valve 2 12 and the stop valve 4 10 are opened, the compressor 11 is started, and the steam compression refrigeration system is started. At this time, the low-temperature and low-pressure refrigerant medium vapor in the evaporator 8 passes through the three-way valve 3 9 and the stop valve 4 10 to enter the compressor 11 for compression, and the high-temperature and high-pressure refrigerant medium vapor coming out of the compressor 11 enters the condenser 5 through the stop valve 2 12. The high-temperature and high-pressure refrigerant medium vapor is condensed into liquid in the condenser 5, and the refrigerant medium liquid enters the throttle valve 7 through the three-way valve 2 6. The refrigerant medium liquid after the pressure reduction by the throttle valve 7 enters the evaporator 8, and the evaporator 8 provides cooling for the user 18. While providing cooling, the evaporator in the refrigeration cycle exchanges heat with the air, and the air condenses when it encounters cold, thereby generating condensed water. The condensed water generated on the evaporator is collected and processed, and then transported to the user through the water supply pipeline to realize cold water supply.

[0035] Example 2 See also Figure 3 Based on Example 1, this embodiment further introduces a wind and solar energy combined cooling, heating, electricity and water supply control method for an offshore platform, which is used to control the combined cooling, heating, electricity and water supply system of Example 1, and specifically includes the following steps: S1: Detect whether the temperature of the photoelectric heater 17 is greater than a first set value, and determine whether the heating mode of the photoelectric heater 17 is an electric heating mode or a solar heating mode; In this embodiment, the first setting value is 50°C as an example, which can be selected according to user needs. In this embodiment, it is preferably selected within the range of 35°C-50°C. If the temperature of the photoelectric heater 17 is less than or equal to 50°C, it is determined to be an electric heating mode, and if the temperature of the photoelectric heater 17 is greater than 50°C, it is determined to be a solar heating mode.

[0036] S2: If it is determined to be the electric heating mode, the temperature control switch 19 is closed, the photoelectric heater 17 is powered by the wind power generation system, the electric heating mode is entered, and the process returns to step S1, and the steam compression refrigeration mode is directly entered; Therefore, when the sunshine conditions are insufficient, the photoelectric heater 17 is powered by the wind power generation system to increase the temperature of the water in the water tank of the photoelectric heater 17. At the same time, the compressor is powered by the battery of the wind power generation system to enter the steam compression refrigeration mode, and the refrigeration circuit composed of the compressor, condenser, throttle valve and evaporator is used to supply cooling.

[0037] If it is determined to be the solar heating mode, the temperature control switch 19 is turned off, the solar energy is used to heat the photoelectric heater 17, the solar heating mode is entered, heat is directly provided to the user 18, and the corresponding cooling mode is entered by executing step S3. The details are as follows: S3: Detect whether the temperature of the photoelectric heater 17 is greater than a second set value, and determine whether the refrigeration mode of the refrigeration system is a steam injection refrigeration mode or a steam compression refrigeration mode; In this embodiment, the second set value is 75°C as an example, which can be selected according to the refrigeration medium. If the temperature of the photoelectric heater 17 is greater than or equal to 75°C, the steam injection refrigeration mode is determined, and if the temperature of the photoelectric heater 17 is less than 75°C, the steam compression refrigeration mode is determined.

[0038] If it is determined to be the steam injection refrigeration mode, then the stop valve 1 3 and the stop valve 3 13 are opened, the stop valve 2 12 and the stop valve 4 10 are closed, and the booster pump 14, the generator 1 and the ejector 2 are started, so that the refrigerant in the pipeline enters the condenser 5 and the evaporator 8 through the ejector 2, and enters the steam injection refrigeration mode, and supplies cooling to the user 18 through the evaporator 8; If it is determined to be the steam compression refrigeration mode, then the stop valve 1 3 and the stop valve 3 13 are closed, the stop valve 2 12 and the stop valve 4 10 are opened, and the compressor 11 is started by powering by the wind power generation system, so that the cooling medium in the pipeline enters the condenser 5 and the evaporator 8 through the compressor 11, enters the steam compression refrigeration mode, and supplies cooling to the user 18 through the evaporator 8.

[0039] In addition, while the refrigeration system is providing cooling, the evaporator in the refrigeration cycle exchanges heat with the air. The air condenses when it gets cold, thereby producing condensed water. The condensed water produced on the evaporator is collected and processed, and then transported to the user through the water supply pipe to achieve cold water supply.

[0040] See also Figure 2 The stop valve 1 3 is arranged on the pipeline between the ejector 2 and the condenser 5, the stop valve 3 13 is arranged on the pipeline between the condenser 5 and the boost pump 14, the stop valve 2 12 is arranged on the pipeline between the high-pressure outlet of the compressor 11 and the condenser 5, and the stop valve 4 10 is arranged on the pipeline between the low-pressure inlet of the compressor 11 and the evaporator 8.

[0041] Combination Figure 2 and Figure 3 As shown, according to different sunshine conditions, the present invention has two cooling and heating modes, which are as follows: Mode 1, that is, when there is sufficient sunshine, first determine whether the temperature of the photoelectric heater 17 is greater than the first set value, such as 50°C. If it is greater than the first set value, heat is directly supplied to the user 18. At the same time, determine whether the temperature is greater than the second set value, such as 75°C. If it is greater than the second set value, cool and supply cold water to the user 18 through the steam injection refrigeration mode. If it is not greater than the second set value, start the compressor 11 and power it through the wind power generation system, and use the steam compression refrigeration mode to supply cool and supply cold water to the user 18. Refrigeration is performed in the steam compression refrigeration mode to solve the problem that the temperature of the water tank of the photoelectric heater 17 is too low to reach the working temperature of the generator 1 in the steam injection refrigeration system, resulting in the inability to activate the steam injection refrigeration mode.

[0042] Mode 2, that is, when there is insufficient sunshine, first close the temperature control switch 19, power the photoelectric heater 17 through the wind power generation system for heating, and at the same time start the compressor 11 and power it through the wind power generation system, and use the steam compression refrigeration mode to provide cooling and cold water for the user 18. After heating for a period of time, the temperature of the water in the photoelectric heater 17 is detected again. When the temperature is detected to be greater than 50°C, heat can be supplied to the user 18. Refrigeration through the steam compression refrigeration mode solves the problem that the steam injection refrigeration mode cannot be used when there is insufficient sunshine, and ensures the refrigeration needs and cold water needs of various machine room equipment, life, etc. of the offshore platform user 18 when the sunshine conditions are insufficient. The wind power generation system is used to power the photoelectric heater in an electric heating mode to ensure the heating needs of the offshore platform users when the sunshine conditions are insufficient.

[0043] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wind and solar energy combined cooling, heating, electricity and water supply system for an offshore platform, comprising a steam jet refrigeration system, the steam jet refrigeration system comprising a generator (1), an ejector (2), a condenser (5), a booster pump (14), a throttle valve (7) and an evaporator (8), characterized in that: The wind and solar energy combined cooling, heating, electricity and water supply system for the offshore platform also includes a photoelectric heater (17), a wind power generation system and a compressor (11); The photoelectric heater (17) is connected to the generator (1) via a water inlet port and a water outlet port, is used to supply hot water to the generator (1), and is powered by a wind power generation system; The high-pressure outlet of the compressor (11) is respectively connected to the inlet of the condenser (5) and the outlet of the ejector (2), and the low-pressure inlet is respectively connected to the outlet of the evaporator (8) and the injection port of the ejector (2), and is powered by a wind power generation system; The wind power generation system comprises a wind power generator set (16) and a storage battery (15), wherein the storage battery is electrically connected to a photoelectric heater (17), a compressor (11) and a user (18) distribution box, respectively, wherein a temperature control switch (19) is provided on the circuit between the photoelectric heater (17) and the storage battery (15), and the temperature control switch is communicatively connected to a temperature sensor of the photoelectric heater (17).

2. The combined cooling, heating, electricity and water supply system according to claim 1, characterized in that: The generator (1), the ejector (2), the condenser (5), and the booster pump (14) in the steam jet refrigeration system are sequentially connected to form a circulation loop, and the inlet of the throttle valve (7) is connected to the outlet of the condenser (5), the outlet of the throttle valve (7) is connected to the inlet of the evaporator (8), and the outlet of the evaporator (8) is connected to the injection port of the ejector (2), so that the ejector, the condenser, the throttle valve, and the evaporator are sequentially connected to form another circulation loop.

3. The combined cooling, heating, electricity and water supply system according to claim 1, characterized in that: The high-pressure outlet of the compressor (11) is respectively connected to the inlet of the condenser (5) and the outlet of the ejector (2) through a tee, and the low-pressure inlet of the compressor (11) is respectively connected to the outlet of the evaporator (8) and the injection port of the ejector (2) through a tee.

4. The combined cooling, heating, electricity and water supply system according to claim 1, characterized in that: A stop valve 1 (3) is provided on the pipeline between the ejector (2) and the condenser (5), and a stop valve 3 (13) is provided on the pipeline between the condenser (5) and the booster pump (14).

5. The combined cooling, heating, electricity and water supply system according to claim 1, characterized in that: A second stop valve (12) is provided on the pipeline between the high-pressure outlet of the compressor (11) and the condenser (5), and a fourth stop valve (10) is provided on the pipeline between the low-pressure inlet of the compressor (11) and the evaporator (8).

6. A wind and solar combined cooling, heating, electricity and water supply control method for an offshore platform, used to control the combined cooling, heating, electricity and water supply system of claim 1, comprising the following steps: S1: Detecting whether the temperature of the photoelectric heater (17) is greater than a first set value, and determining whether the heating mode of the photoelectric heater (17) is an electric heating mode or a solar heating mode; S2: If it is determined to be the electric heating mode, the temperature control switch (19) is closed, the photoelectric heater (17) is powered by the wind power generation system, the electric heating mode is entered, and the process returns to step S1, while directly entering the steam compression refrigeration mode; If it is determined to be the solar heating mode, the temperature control switch (19) is turned off, the photoelectric heater (17) is heated by solar energy, the solar heating mode is entered, heat is directly supplied to the user (18), and the corresponding cooling mode is entered by executing step S3; S3: Detecting whether the temperature of the photoelectric heater (17) is greater than a second set value, and determining whether the refrigeration mode of the refrigeration system is a steam injection refrigeration mode or a steam compression refrigeration mode; If it is determined that the steam jet refrigeration mode is selected, the booster pump (14), the generator (1) and the ejector (2) are started, so that the refrigerant in the pipeline enters the condenser (5) and the evaporator (8) through the ejector (2), enters the steam jet refrigeration mode, and supplies cooling and cold water to the user (18) through the evaporator (8); If the steam compression refrigeration mode is determined, the compressor (11) is started by powering the wind power generation system, so that the refrigerant in the pipeline enters the condenser (5) and the evaporator (8) through the compressor (11), enters the steam compression refrigeration mode, and supplies cooling and cold water to the user (18) through the evaporator (8).

7. The method for controlling the combined cooling, heating, electricity and water supply according to claim 6, characterized in that: The steam injection refrigeration mode is entered in step S3, and the following steps are further performed: Open stop valve 1 (3) and stop valve 3 (13), and close stop valve 2 (12) and stop valve 4 (10); The stop valve 1 (3) is arranged on the pipeline between the ejector (2) and the condenser (5), the stop valve 3 (13) is arranged on the pipeline between the condenser (5) and the booster pump (14), the stop valve 2 (12) is arranged on the pipeline between the high-pressure outlet of the compressor (11) and the condenser (5), and the stop valve 4 (10) is arranged on the pipeline between the low-pressure inlet of the compressor (11) and the evaporator (8).

8. The method for controlling the combined cooling, heating, electricity and water supply according to claim 6, characterized in that: Entering the steam compression refrigeration mode in step S3 further includes performing the following steps: Close stop valve 1 (3) and stop valve 3 (13), and open stop valve 2 (12) and stop valve 4 (10); The stop valve 1 (3) is arranged on the pipeline between the ejector (2) and the condenser (5), the stop valve 3 (13) is arranged on the pipeline between the condenser (5) and the booster pump (14), the stop valve 2 (12) is arranged on the pipeline between the high-pressure outlet of the compressor (11) and the condenser (5), and the stop valve 4 (10) is arranged on the pipeline between the low-pressure inlet of the compressor (11) and the evaporator (8).

9. The method for controlling the combined cooling, heating, electricity and water supply according to claim 6, characterized in that: The first set value is 35°C-50°C.

10. The method for controlling the combined cooling, heating, electricity and water supply according to claim 6 or 9, characterized in that: The second set value is not less than 75°C.

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