Offshore wind and light power generation system

Abstract

The utility model discloses an offshore wind and light power generation system, and relates to the technical field of wind and light power generation, the offshore wind and light power generation system comprises a wind power generation assembly, a photovoltaic power generation assembly, a storage battery, a pumped storage device and a compressed air energy storage device which are respectively connected with a power grid, and the pumped storage device comprises a lower reservoir, an upper reservoir, a pump turbine and a pressure pipeline; the upper reservoir is located above the lower reservoir, the lower reservoir and the upper reservoir are connected through the pressure pipeline, the pump turbine is arranged in the lower reservoir and connected with the pressure pipeline, a valve is arranged on the pressure pipeline, and the controller is connected with the pump turbine, the valve, the storage battery and the compressed air energy storage device. By arranging the three energy storage devices, namely the storage battery, the pumped storage device and the compressed air energy storage device, the controller can control the corresponding energy storage devices to store electricity and discharge electricity according to working conditions, complex working condition changes on the sea can be effectively adapted, low-efficiency operation of the pump turbine is avoided, and loss of the pump turbine is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind and solar power generation, and in particular to an offshore wind and solar power generation system. Background Art

[0002] Pumped storage is a type of energy storage technology that uses water as an energy storage medium to store and manage electrical energy through the conversion of electrical energy and potential energy. The water level change in the lower reservoir of a pumped storage device is a tidal change. Pumped storage devices alone are difficult to adapt to the complex working conditions at sea, which will lead to low-efficiency operation of pump turbines during periods of low load demand, causing damage to the pump turbines.

[0003] Therefore, how to adapt to the complex changes in offshore operating conditions and avoid inefficient operation of pump turbines is a problem that technical personnel in this field need to solve. Utility Model Content

[0004] The purpose of this application is to provide an offshore wind-solar power generation system to solve the problem that relying solely on pumped storage devices is difficult to adapt to complex changes in offshore working conditions, which will lead to inefficient operation of pumps and turbines during periods of low load demand, causing wear and tear on the pumps and turbines.

[0005] In order to solve the above technical problems, the present application provides an offshore wind-solar power generation system, comprising: a wind power generation component, a photovoltaic power generation component, a battery, a pumped storage device, a compressed air energy storage device and a controller;

[0006] The wind power generation component, the photovoltaic power generation component, the battery, the pumped storage device and the compressed air energy storage device are respectively connected to the power grid; the pumped storage device comprises a lower reservoir, an upper reservoir, a pump turbine and a pressure pipeline; the upper reservoir is located above the lower reservoir, and the lower reservoir and the upper reservoir are connected via the pressure pipeline; the pump turbine is arranged in the lower reservoir and connected to the pressure pipeline; a valve is provided on the pressure pipeline; and the controller is respectively connected to the pump turbine, the valve, the battery and the compressed air energy storage device.

[0007] Optionally, the compressed air energy storage device includes a water reservoir, a water pump, a water-gas co-containment chamber, a high-pressure air storage chamber, a water turbine and an air compressor; the side wall of the water-gas co-containment chamber is provided with a water inlet and a water outlet, the top of the water-gas co-containment chamber is provided with a first air outlet, the water reservoir is connected to the water inlet through the water pump, the water outlet is connected to the water reservoir through the water turbine, the first air outlet is connected to the high-pressure air storage chamber through the air compressor, and the water pump and the air compressor are both connected to the controller.

[0008] Optionally, the high-pressure air storage chamber is provided with a pressure sensor, and a second air outlet is provided near the top opening of the high-pressure air storage chamber, the second air outlet is connected to the high-pressure air storage chamber through a supercharger, and the controller is respectively connected to the pressure sensor and the supercharger.

[0009] Optionally, an air inlet is provided at the top of the high-pressure air storage chamber, the air inlet is connected to the high-pressure air storage chamber via a throttle valve, and the throttle valve is connected to the controller.

[0010] Optionally, the wind power generation component and the photovoltaic power generation component are respectively connected to the power grid through a main circuit, and the main circuit is provided with an inverter and a transformer, and the battery is connected to the power grid through the inverter and the transformer in turn.

[0011] Optionally, a flow meter is provided on the pressure pipeline, and the flow meter is connected to the controller.

[0012] Optionally, a filter assembly is provided on the pressure pipe.

[0013] Optionally, the filter assembly includes a first filter screen and a second filter screen, and the first filter screen and the second filter screen are detachably connected to two ends of the pressure pipe respectively.

[0014] Optionally, there are multiple batteries.

[0015] Optionally, an alarm device connected to the controller is also included.

[0016] The present application provides an offshore wind-solar power generation system, comprising: a wind power generation component, a photovoltaic power generation component, a battery, a pumped storage device, a compressed air energy storage device and a controller; the wind power generation component, the photovoltaic power generation component, the battery, the pumped storage device and the compressed air energy storage device are respectively connected to the power grid, the pumped storage device comprises a lower reservoir, an upper reservoir, a pump turbine and a pressure pipe, the upper reservoir is located above the lower reservoir, and the lower reservoir and the upper reservoir are connected by a pressure pipe, the pump turbine is arranged in the lower reservoir and connected to the pressure pipe, the pressure pipe is provided with a valve, and the controller is respectively connected to the pump turbine, the valve, the battery and the compressed air energy storage device. By setting three energy storage devices, namely, batteries, pumped storage devices and compressed air energy storage devices, the controller can control the storage and discharge of the corresponding energy storage devices according to the working conditions, and can effectively adapt to the complex working conditions at sea, avoid the inefficient operation of the pump turbine, and reduce the loss of the pump turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A structural diagram of an offshore wind-solar power generation system provided in an embodiment of the present application;

[0019] The accompanying drawings are marked as follows: 1 is a wind power generation component, 2 is a photovoltaic power generation component, 3 is a battery, 4 is a pumped storage device, 5 is a compressed air energy storage device, 6 is an inverter, 7 is a transformer, 401 is a lower reservoir, 402 is an upper reservoir, 403 is a pump turbine, 404 is a pressure pipeline, 405 is a valve, 501 is a water reservoir, 502 is a pump, 503 is a water-gas co-containment chamber, 504 is a high-pressure air storage chamber, 505 is a turbine, 506 is an air compressor, 507 is a booster, and 508 is a throttle valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The core of this application is to provide an offshore wind-solar power generation system to adapt to complex changes in offshore working conditions and avoid inefficient operation of water pumps and turbines.

[0022] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Figure 1 A structural diagram of an offshore wind-solar power generation system provided in an embodiment of the present application is shown in FIG. Figure 1As shown, the offshore wind-solar power generation system includes: a wind power generation component 1, a photovoltaic power generation component 2, a battery 3, a pumped storage device 4, a compressed air energy storage device 5 and a controller; the wind power generation component 1, the photovoltaic power generation component 2, the battery 3, the pumped storage device 4 and the compressed air energy storage device 5 are respectively connected to the power grid, the pumped storage device 4 includes a lower reservoir 401, an upper reservoir 402, a pump-turbine 403 and a pressure pipe 404, the upper reservoir 402 is located above the lower reservoir 401, and the lower reservoir 401 and the upper reservoir 402 are connected through the pressure pipe 404, the pump-turbine 403 is arranged in the lower reservoir 401 and connected to the pressure pipe 404, the pressure pipe 404 is provided with a valve 405, and the controller is respectively connected to the pump-turbine 403, the valve 405, the battery 3 and the compressed air energy storage device 5.

[0024] The embodiment of the present application does not specifically limit the number of storage batteries 3, and multiple storage batteries 3 can be used to store the electricity that cannot be consumed by the pumped storage device 4 and the compressed air energy storage device 5. The present application does not specifically limit the size of the upper reservoir 402 and the lower reservoir 401 in the pumped storage device 4. A flow meter can be set on the pressure pipe 404 connecting the upper reservoir 402 and the lower reservoir 401. The flow meter is connected to the controller, and the controller can adjust the opening of the valve 405 according to the flow feedback from the flow meter. Further, a filter assembly can also be provided on the pressure pipe 404. Specifically, the filter assembly includes a first filter screen and a second filter screen. The first filter screen and the second filter screen are detachably connected to the two ends of the pressure pipe 404, respectively. By setting the filter screen, the water in the upper reservoir 402 and the lower reservoir 401 can be filtered to prevent the pressure pipe 404 from being blocked. In addition, the filter screen can be detachably installed on the pressure pipe 404 for easy cleaning or replacement.

[0025] The embodiment of the present application does not specifically limit the compressed air energy storage device 5. The compressed air energy storage device 5 is a device that uses compressed air to store energy. Its working principle is that during the period of low electricity consumption, electric energy is used to compress the air to high pressure and store it in a pressure vessel, so that the electric energy is converted into the internal energy of the air and stored. During the period of peak electricity consumption, the high-pressure air is released from the pressure vessel to drive the generator to generate electricity. Specifically, the compressed air energy storage device 5 includes a water reservoir 501, a water pump 502, a water-gas co-containment chamber 503, a high-pressure air storage chamber 504, a water turbine 505 and an air compressor 506; the side wall of the water-gas co-containment chamber 503 is provided with a water inlet and a water outlet, the water outlet is below the water inlet, and the top of the water-gas co-containment chamber 503 is provided with a first air outlet, the water reservoir 501 is connected to the water inlet through the water pump 502, the water outlet is connected to the water reservoir 501 through the water turbine 505, the first air outlet is connected to the high-pressure air storage chamber 504 through the air compressor 506, and the water pump 502 and the air compressor 506 are both connected to the controller. Further, the high-pressure air storage chamber 504 is provided with a pressure sensor, and a second air outlet is provided near the top opening of the high-pressure air storage chamber 504, and the second air outlet is connected to the high-pressure air storage chamber 504 through the supercharger 507, and the controller is respectively connected to the pressure sensor and the supercharger 507. An air inlet is provided at the top of the high-pressure air storage chamber 504, and the air inlet is connected to the high-pressure air storage chamber 504 through a throttle valve 508, and the throttle valve 508 is connected to the controller.

[0026] The working process of the compressed air energy storage device 5 is described below: when storing electricity, the water pump 502 pumps the water from the water reservoir 501 into the water-gas co-containment chamber 503, and the air compressor 506 compresses the air in the water-gas co-containment chamber 503, converting the electrical energy into air internal energy and storing it in the high-pressure air storage chamber 504; when supplying electricity, the gas in the high-pressure air storage chamber 504 is released through the first air outlet into the water-gas co-containment chamber 503, and the water in the water-gas co-containment chamber 503 drives the turbine 505 to generate electricity. In order to ensure that the pressure in the high-pressure air storage chamber 504 is within a reasonable range, when the pressure detected by the pressure sensor is lower than the preset value, the controller controls the supercharger 507 to supply gas to the high-pressure air storage chamber 504 for pressurization, and when the pressure in the high-pressure air storage chamber 504 is too high, the air is released through the throttle valve 508 to reduce the pressure. Based on this, an alarm device connected to the controller is also included, which can issue an alarm prompt when the pressure detected by the pressure sensor is too high to improve safety.

[0027] The wind power generation component 1 and the photovoltaic power generation component 2 are respectively connected to the power grid through the main circuit, and the main circuit is provided with an inverter 6 and a transformer 7. The battery 3 is connected to the power grid through the inverter 6 and the transformer 7 in turn. The inverter 6 converts the DC power into a constant frequency and voltage or frequency and voltage regulated AC power for use by other devices. The transformer 7 can convert the voltage of the input power supply into a voltage suitable for the load requirements.

[0028] An offshore wind-solar power generation system provided in an embodiment of the present application includes: a wind power generation component, a photovoltaic power generation component, a battery, a pumped storage device, a compressed air energy storage device and a controller; the wind power generation component, the photovoltaic power generation component, the battery, the pumped storage device and the compressed air energy storage device are respectively connected to the power grid, the pumped storage device includes a lower reservoir, an upper reservoir, a pump turbine and a pressure pipe, the upper reservoir is located above the lower reservoir, and the lower reservoir and the upper reservoir are connected by a pressure pipe, the pump turbine is arranged in the lower reservoir and connected to the pressure pipe, the pressure pipe is provided with a valve, and the controller is respectively connected to the pump turbine, the valve, the battery and the compressed air energy storage device. By setting three energy storage devices, namely, batteries, pumped storage devices and compressed air energy storage devices, the controller can control the storage and discharge of the corresponding energy storage devices according to the working conditions, and can effectively adapt to the complex working conditions at sea, avoid the inefficient operation of the pump turbine, and reduce the loss of the pump turbine.

[0029] To better understand the present application, the application process of the offshore wind and solar power generation system is introduced below.

[0030] This system fully considers the characteristics of offshore wind and solar resources and the response time, power generation cost, energy conversion efficiency and efficiency characteristics of different energy storage under different working conditions to formulate a reasonable collaborative operation strategy: when the net load is negative and the excess power is greater than 20% of the rated power of the water pump in the pump-turbine 403, the pumped storage device 4 is used for energy storage first; if it cannot be completely absorbed, the auxiliary energy storage device (battery 3 and / or compressed air energy storage device 5) is used, and the equipment with surplus capacity is given priority. If there is power absorption capacity, it depends on the specific working conditions. When the net load is negative and the excess power is less than or equal to 20% of the rated power of the water pump in the pump-turbine 403, the auxiliary energy storage device (battery 3 and / or compressed air energy storage device 5) is directly used to absorb the excess power. When the net load is negative and the excess power is greater than the one-hour storage capacity of the energy storage device (battery 3, pumped storage device 4 and compressed air energy storage device 5), multiple energy storage devices are used to store the excess power at the same time and the remaining power that cannot be absorbed is discarded. When the net load is positive and the excess power is greater than 30% of the rated power of the turbine in the pump-turbine 403, the pumped storage device 4 is used for power supply first; if the load demand cannot be met, the auxiliary energy storage device (battery 3 and / or compressed air energy storage device 5) is used to continue to supply power, and the equipment with remaining capacity is given priority, otherwise it depends on the specific working conditions. When the net load is negative or positive, and the excess power is less than or equal to 30% of the rated power of the turbine in the pump-turbine 403, the auxiliary energy storage device is used directly for power supply. When the net load is positive and the excess power is greater than the one-hour power generation capacity of the energy storage system, multiple energy storage devices are used for power supply at the same time.

[0031] The system of the present application can make full use of offshore resources to solve the power supply problem in coastal cities and realize the efficient operation of the power generation system. At the same time, it can adapt to different working conditions through multiple energy storage complementarity, extend the life of the energy storage device, further improve the power supply reliability, and improve the clean energy absorption capacity.

[0032] The above is a detailed introduction to an offshore wind-solar power generation system provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can refer to each other. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0033] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An offshore wind-solar power generation system, characterized in that: include: Wind power generation component (1), photovoltaic power generation component (2), battery (3), pumped storage device (4), compressed air energy storage device (5) and controller; The wind power generation component (1), the photovoltaic power generation component (2), the storage battery (3), the pumped storage device (4) and the compressed air energy storage device (5) are respectively connected to a power grid; the pumped storage device (4) comprises a lower reservoir (401), an upper reservoir (402), a pump turbine (403) and a pressure pipeline (404); the upper reservoir (402) is located above the lower reservoir (401), and the lower reservoir (401) and the upper reservoir (402) are connected via the pressure pipeline (404); the pump turbine (403) is arranged in the lower reservoir (401) and connected to the pressure pipeline (404); a valve (405) is provided on the pressure pipeline (404); and the controller is respectively connected to the pump turbine (403), the valve (405), the storage battery (3) and the compressed air energy storage device (5).

2. The offshore wind-solar power generation system according to claim 1, characterized in that: The compressed air energy storage device (5) comprises a water reservoir (501), a water pump (502), a water-gas co-containment chamber (503), a high-pressure air storage chamber (504), a water turbine (505) and an air compressor (506); a water inlet and a water outlet are provided on the side wall of the water-gas co-containment chamber (503); a first air outlet is provided on the top of the water-gas co-containment chamber (503); the water reservoir (501) is connected to the water inlet via the water pump (502); the water outlet is connected to the water reservoir (501) via the water turbine (505); the first air outlet is connected to the high-pressure air storage chamber (504) via the air compressor (506); and the water pump (502) and the air compressor (506) are both connected to the controller.

3. The offshore wind-solar power generation system according to claim 2, characterized in that: The high-pressure gas storage chamber (504) is provided with a pressure sensor, and a second gas outlet is provided near the top opening of the high-pressure gas storage chamber (504), the second gas outlet is connected to the high-pressure gas storage chamber (504) via a supercharger (507), and the controller is respectively connected to the pressure sensor and the supercharger (507).

4. The offshore wind-solar power generation system according to claim 3, characterized in that: An air inlet is provided at the top of the high-pressure air storage chamber (504); the air inlet is connected to the high-pressure air storage chamber (504) via a throttle valve (508); and the throttle valve (508) is connected to the controller.

5. The offshore wind-solar power generation system according to claim 1, characterized in that: The wind power generation component (1) and the photovoltaic power generation component (2) are respectively connected to the power grid via a main circuit, an inverter (6) and a transformer (7) are provided on the main circuit, and the storage battery (3) is connected to the power grid via the inverter (6) and the transformer (7) in turn.

6. The offshore wind-solar power generation system according to claim 1, characterized in that: The pressure pipeline (404) is provided with a flow meter, and the flow meter is connected to the controller.

7. The offshore wind-solar power generation system according to claim 1, characterized in that: The pressure pipe (404) is provided with a filter assembly.

8. The offshore wind-solar power generation system according to claim 7, characterized in that: The filter assembly comprises a first filter screen and a second filter screen, wherein the first filter screen and the second filter screen are respectively detachably connected to two ends of the pressure pipe (404).

9. The offshore wind-solar power generation system according to any one of claims 1 to 8, characterized in that: The number of the storage batteries (3) is multiple.

10. The offshore wind-solar power generation system according to claim 3, characterized in that: Also included is an alarm device connected to the controller.

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