Wind power and pumped storage combined power generation device and method

Abstract

The invention relates to the technical field of renewable energy wind power, in particular to a wind power and pumped storage combined power generation device and method.The wind power and pumped storage combined power generation device is characterized in that an upper water storage tank is arranged at the bottom of a tower of a wind driven generator and connected with a lower reservoir through a water pumping pipeline, and the lower reservoir is arranged in the wind driven generator; the pumped storage unit comprises a transformer, a motor, a water pump machine, a generator and a water turbine, the water turbine and the water pump machine are arranged on a water pumping pipeline, and when the power grid load of the pumped storage unit is off-peak, the motor drives the water pump machine to rotate to pump water in the lower reservoir to the upper water storage tank, and when the power grid load is peak, the water in the upper water storage tank is discharged to the lower reservoir. And the wind driven generator and the water turbine supply power to a power grid. The structure of the upper water storage tank and the lower water storage tank improves the rigidity of the tower barrel structure, enhances the anti-overturning capacity of the tower barrel, is low in development cost and low in requirements for water sources and terrains, achieves the on-site energy storage service of renewable energy sources, and reduces the occupied volume of a pumped storage system.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy wind power technology, and in particular to a wind power and pumped storage combined power generation device and method. Background Art

[0002] With the depletion of fossil energy and the continuous development of the manufacturing industry, people's demand for energy is increasing, so the exploration of renewable energy is imminent. Wind power generation is a fairly mature and widely used renewable energy generation technology. Moreover, wind energy is a clean energy, which is characterized by no pollution to the environment and is conducive to promotion. However, renewable energy such as wind power generation will undergo significant changes due to various external factors such as climatic conditions, and is random and volatile. Direct access to wind power will impact the stability of the power system and have a huge impact on the security of the power grid.

[0003] At present, energy storage systems are usually used to smooth the output power of wind power, so as to integrate wind power into the power grid safely and efficiently. Common energy storage systems include: battery energy storage, compressed air energy storage, pumped storage, etc. Among them, battery energy storage is more convenient, but it is costly, difficult to maintain, and will pollute the environment during the production process; compressed air energy storage requires the construction of a compressed air system and special geographical conditions as a large air storage room, and a large part of the energy of the traditional air compression system is converted into heat energy during the air compression process, which is not effectively utilized and has low efficiency. The characteristics of pumped storage power stations are simple principles, long life, large capacity, high power storage efficiency, green and environmentally friendly, and centralized energy storage. Therefore, pumped storage is the most widely used energy storage method to date.

[0004] The problem faced by the pumped storage system is that it occupies a large area, has high construction costs, requires a large amount of infrastructure such as dams, pumping stations, power stations and related pipelines, requires a lot of basic engineering, and naturally requires a lot of maintenance. Secondly, pumped storage power stations require superior geographical conditions to build reservoirs and dams. Since an upper reservoir and a lower reservoir are required, they are generally built in mountainous and hilly areas with mountains and water. As a result, places that meet the geographical conditions for pumped storage are limited, and such places are often far away from the load center and the transmission distance is long. Therefore, how to optimize the existing wind power combined with pumped storage system is a problem that wind power generation needs to pay attention to and solve in the future. Summary of the invention

[0005] The present invention provides a wind power and pumped storage combined power generation device and method to solve the problems of intermittency and volatility of existing wind power generation.

[0006] The first aspect of the present invention provides a wind power and pumped storage combined power generation device, comprising: a wind turbine, a pumped storage unit, an upper water storage tank and a lower water reservoir, wherein an upper water storage tank is arranged at the bottom of the tower of the wind turbine, the upper water storage tank is connected to the lower water reservoir through a pumping pipe, the lower water reservoir is arranged inside the foundation of the wind turbine, the upper water storage tank is arranged on the top of the lower water reservoir, the pumped storage unit comprises a transformer, an electric motor, a water pump, a generator and a turbine, the water turbine and the water pump are arranged on the pumping pipe, the electric The motor is connected to the water pump, the generator is connected to the water turbine, and the motor and the generator are both connected to the transformer. The pumped storage unit is used to drive the motor to drive the water pump in the opposite direction when the power grid is in a low load state, so as to pump water from the lower water reservoir to the upper water tank for pumped storage. When the power grid is in a peak load state, the water in the upper water tank is discharged to the lower water reservoir, and the generator is driven by the water turbine to generate electricity, so that the wind generator and the water turbine supply power to the power grid at the same time.

[0007] Optionally, the above-mentioned wind power and pumped storage combined power generation device further includes: an inspection passage, which is arranged on one side of the upper water storage tank.

[0008] Optionally, the upper water storage tank is a cylindrical container formed by welding steel plates, and the wall thickness of the upper water storage tank is greater than or equal to a preset thickness.

[0009] Optionally, the upper water storage tank is welded and fixed to the outside of the wind turbine tower.

[0010] Optionally, the lower water reservoir is a cylindrical container, and concrete is poured around and on the bottom of the lower water reservoir for fixation.

[0011] Optionally, the upper water storage tank is coaxially arranged with the lower water storage tank, the upper water storage tank is located above the ground, and the lower water storage tank is located below the ground.

[0012] The second aspect of the present invention provides a method for combined power generation of wind power and pumped storage, using the above-mentioned combined power generation device of wind power and pumped storage, wherein the method includes: detecting the current load state of the power grid; if the current load state is in a valley state, using the electricity generated by the wind generator to drive the water pump to rotate in the opposite direction through the electric motor, and pumping the water from the lower water reservoir to the upper water tank for pumped storage; when the load state is in a peak state, the water from the upper water tank is discharged to the lower water reservoir, and the generator is driven by the water turbine to generate electricity, so that the wind generator and the water turbine supply power to the power grid at the same time.

[0013] Optionally, the power supply capacity and load capacity of the wind turbine are in supply and demand balance, wherein the formula for the supply and demand balance is:

[0014] in, The total power supply capacity for the wind turbine for one day, D all ( t ) is the daily load capacity of the fan, For the fan t The power generation capacity at the moment, For pumped storage t The power generation capacity converted from the potential energy of water at any moment, is the pumping power of the turbine pump at time t, is the system load at time t.

[0015] In the above implementation, when the power grid is in a low-load state, the pumped-storage unit uses the wind turbine to drive the motor to drive the water pump to rotate in the opposite direction, pumping water from the lower water tank to the upper water tank for pumped storage. When the power grid is in a peak load state, the water in the upper water tank is released to the lower water tank, and the turbine drives the generator to generate electricity, so that the wind turbine and the turbine supply power to the power grid at the same time. Thus, the intermittent and volatile problems of existing wind power generation are solved, the structure is simple, easy to control, the utilization efficiency of electric energy is effectively improved, the on-site energy storage service of renewable energy is realized, and the volume occupied by the pumped-storage system is effectively reduced. The comprehensive development cost is low, the requirements for water sources and terrain are low, and the structure of the upper water tank and the lower water tank improves the rigidity of the tower structure and strengthens the anti-overturning ability of the tower.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 A schematic diagram of a wind power and pumped storage combined power generation device provided according to an embodiment of the present invention; Figure 2 A schematic cross-sectional view of a water storage tank and a tower portion of a wind turbine according to an embodiment of the present invention; Figure 3 A schematic diagram of the arrangement of internal components of a pumped storage unit according to an embodiment of the present invention; Figure 4 A schematic diagram of the working principle of a pumped storage unit according to an embodiment of the present invention; Figure 5 A flowchart of the working principle of a wind power and pumped storage combined power generation device according to an embodiment of the present invention; Figure 6 A schematic diagram of calculating the overall overturning moment and anti-overturning moment of a wind turbine structure according to an embodiment of the present invention; Figure 7 The figure is a flow chart of a method for combined power generation of wind power and pumped storage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] The wind power and pumped storage combined power generation device and method of the embodiment of the present invention are described below with reference to the accompanying drawings. In view of the intermittent and fluctuating problems of the existing wind power generation mentioned in the above background technology, the present invention provides a wind power and pumped storage combined power generation device, in which the pumped storage unit uses the wind generator to drive the motor to drive the water pump to rotate in the opposite direction when the power grid is in a low load state, and the water in the lower water tank is pumped to the upper water tank for pumped storage. When the power grid is in a peak load state, the water in the upper water tank is discharged to the lower water tank, and the generator is driven by the water turbine to generate electricity, so that the wind generator and the water turbine supply power to the power grid at the same time. Thus, the intermittent and fluctuating problems of the existing wind power generation are solved, the structure is simple, easy to control, the utilization efficiency of electric energy is effectively improved, the on-site energy storage service of renewable energy is realized, and the volume occupied by the pumped storage system is effectively reduced, the comprehensive development cost is low, the requirements for water sources and terrain are low, and the structure of the upper water tank and the lower water tank improves the rigidity of the tower structure and strengthens the anti-overturning ability of the tower.

[0020] In order to optimize the existing wind power generation combined with pumped storage system, the embodiment of the present invention aims to propose a new type of wind power and pumped storage combined power generation device, which has good power generation stability and small fluctuations, and compared with traditional pumped storage power stations, it occupies less space and is more practical.

[0021] Another purpose of the embodiment of the present invention is to smooth the output power of wind power generation, reduce the impact of unstable wind power on the power grid, and improve the efficiency of power utilization by pumping storage when the power load of the power grid is low, and drive the wind turbine and the turbine to generate electricity simultaneously when the power load of the power grid is peak.

[0022] Specifically, Figure 1A schematic diagram of a wind power and pumped storage combined power generation device provided in an embodiment of the present invention.

[0023] like Figure 1 As shown, the wind power and pumped storage combined power generation device comprises: a wind turbine 1, a pumped storage unit 5, an upper water storage tank 3 and a lower water storage tank 6, wherein: An upper water storage tank 3 is arranged at the bottom of the tower 2 of the wind turbine 1. The upper water storage tank 3 is connected to the lower water storage tank 6 through a pumping pipe 13. The lower water storage tank 6 is arranged inside the foundation of the wind turbine 1. The upper water storage tank 3 is arranged on the top of the lower water storage tank 6. The pumped storage unit 5 includes a transformer 12, a motor 11, a water pump 10, a generator 9 and a turbine 8. The turbine 8 and the water pump 10 are arranged on the pumping pipe 13. The motor 11 is connected to the water pump 10. The generator 9 is connected to the turbine 8. The motor 11 and the generator 9 are both connected to the transformer 12. The pumped storage unit 5 is used to drive the motor 11 to drive the water pump 10 to rotate in the opposite direction when the power grid is in a low load state, so as to pump the water in the lower water reservoir 6 to the upper water tank 3 for pumped storage. When the power grid is in a peak load state, the water in the upper water tank 3 is discharged into the lower water reservoir 6, and the generator 9 is driven by the turbine 8 to generate electricity, so that the wind turbine 1 and the turbine 8 can supply power to the power grid at the same time.

[0024] Optionally, in some embodiments, the above-mentioned wind power and pumped storage combined power generation device further includes: an inspection channel 7, and the inspection channel 7 is arranged on one side of the upper water storage tank 3.

[0025] Optionally, in some embodiments, the upper water storage tank 3 is a cylindrical container welded by steel plates, and the wall thickness of the upper water storage tank 3 is greater than or equal to a preset thickness.

[0026] Optionally, in some embodiments, the upper water storage tank 3 is fixed to the outside of the tower 2 of the wind turbine 1 by welding.

[0027] Optionally, in some embodiments, the lower water reservoir 6 is a cylindrical container, and concrete is poured around and on the bottom of the lower water reservoir 6 for fixation.

[0028] Optionally, in some embodiments, the upper water storage tank 3 and the lower water storage tank 6 are coaxially arranged, the upper water storage tank 3 is located above the ground, and the lower water storage tank 6 is located below the ground.

[0029] Among them, an upper water storage tank 3 is provided outside the tower 2 of the wind turbine 1, and the upper water storage tank 3 is connected to the lower water storage tank 6 through a pumping pipe 13. The lower water storage tank 6 is arranged inside the foundation of the wind turbine, and the upper water storage tank 3 is arranged on the top of the lower water storage tank 6. The pumped storage unit 5 includes a transformer 12, a motor 11, a water pump 10, a generator 9 and a turbine 8. The turbine 8 and the water pump 10 are arranged on the pumping pipe 13, the motor 11 is connected to the water pump 10, the generator 9 is connected to the turbine 8, and the motor 11 and the generator 9 are both connected to the transformer 12. The cross-sectional view of the upper water storage tank 3 and the tower 2 is shown in FIG. Figure 2 As shown, the internal components of the pumped storage unit 5 are arranged as shown in Figure 3 As shown, in Figure 2 Including water storage area 4, in Figure 3 In the embodiment, the upper water outlet 14 of the water pumping pipe and the lower water outlet 15 of the water pumping pipe are included.

[0030] Specifically, the various components of the pumped storage unit 5 are connected as follows: Figure 4 As shown, the working process of each component of the pumped storage unit 5 is as follows Figure 5 As shown, specifically, when the grid load is at a low point, the water pump 10 plays a pumping role, and the pumped-storage unit 5 uses the electricity generated by the wind turbine 1 to drive the water pump 10 to rotate in the opposite direction through the motor 11, and pumps the water in the lower water reservoir 6 to the upper water tank 3 to perform pumped storage. When the grid load is at a peak, the turbine 8 plays a power generation role, and the pumping pipe 13 releases the water in the upper water tank 3 to the lower water reservoir 6, and drives the generator 9 to generate electricity through the turbine 8, so that the wind turbine 1 and the turbine 8 supply power to the grid at the same time.

[0031] To make the purpose, technical scheme and technical effect of the embodiments of the present invention clearer, the following Figure 6 , the technical solution in the embodiment of the present invention is further explained.

[0032] (1) Capacity matching Combination Figure 1 As shown, under the premise of ensuring that the power grid system can operate safely, reliably and stably, wind power should be used as fully as possible to meet the load demand of the power system. In order to ensure the normal operation of the system, the supply and demand balance of all its power supply capacity and all load capacity must be met. According to the installed capacity of a single wind turbine in the wind farm and the demand for power grid load capacity, the capacity of the upper water storage tank and the lower water reservoir required to be matched is determined. The following provides a preferred embodiment of a specific application: Supply and demand balance of power supply capacity and load capacity of a single wind turbine:

[0033] in, The total power supply capacity for the wind turbine for one day, Dall ( t ) is the daily load capacity of the fan, For the fan The power generation capacity at the moment, For pumped storage The power generation capacity converted from the potential energy of water at any moment, For water turbine pump Pumping power at the moment, for System load at any time.

[0034] Fan in t The actual power generation capacity at the moment is: ; in, is the air density, for The actual wind speed blowing across the blades at any given moment. is the fan blade radius, is the actual wind energy utilization coefficient, generally taken as <0.593.

[0035] Pumped storage in t The actual power generation capacity converted from the potential energy of water at this moment is: ; in, is the potential energy conversion efficiency of water, usually between 0.8 and 0.9. express t The quality of water at all times, is the gravitational acceleration of water, Indicates the water head height.

[0036] Taking an actual large-scale power grid as an example, assume that the total installed capacity of its wind farm is 5000 MW (equivalent to 3333 1.5 MW wind turbines), the total pumped storage capacity is 1200 MW, and the water head is 25 m. According to the regularity of daily load capacity, at least 7 hours of pumping are carried out every day (24 hours) for pumped storage. The pumped storage capacity of a single wind turbine is calculated to be 0.36 MW. Assuming a 40% energy storage efficiency, the maximum water storage capacity change of a single wind turbine in one day is about 12000 m 3 .

[0037] The shape and size of the upper water storage tank are determined to be: cylindrical, with an inner diameter of 20 m, a height of 40 m, and a maximum capacity of 12560m 3 .

[0038] The shape and size of the lower reservoir are determined to be: cylindrical, with an inner diameter of 40 m, a height of 10 m, and a maximum capacity of 12560m 3 .

[0039] (2) Structural design Considering the large water storage capacity of the upper water storage tank, it is necessary to verify the structure of the upper water storage tank to determine the reasonable wall thickness. It is assumed that the upper water storage tank is welded with Q355b steel.

[0040] The pressure on the bottom container wall of the upper water storage tank is: ; in, is the density of water, is the gravitational acceleration of water, Indicates the water head height.

[0041] Determine the container type for the upper water storage tank: Thin-walled containers: ; Thick-walled containers: ; in, is the inner diameter of the upper water storage tank, is the thickness of the upper water storage tank.

[0042] After calculation, the upper water storage tank is a thin-walled container. For thin-walled containers, the hoop stress and axial stress of the most unfavorable section at the bottom of the upper water storage tank are: ; In the formula, It is the welding joint coefficient, which is generally taken as 0.8~1.

[0043] Taking into account that the inner wall steel of the upper water storage tank may produce defects such as microcracks after yielding, which will affect the safety of long-term operation, the wall thickness is determined according to the elastic failure mode. That is, when the principal stress on the inner wall steel of the upper water storage tank exceeds its yield strength and enters the plastic stage, the upper water storage tank will fail and cannot be used any longer.

[0044] According to the first strength theory and thin wall formula, the wall thickness of the upper water storage tank should be greater than the preset thickness, that is: ; In the formula, is the yield strength of steel.

[0045] After calculation, the wall thickness of the upper water storage tank should meet δ ≥23mm.

[0046] At the same time, considering that the installation of the upper water storage tank increases the cross-sectional area of ​​the tower, the bending stiffness of the bottom of the tower is improved.

[0047] Bending stiffness of the bottom of the original wind turbine tower: ; Bending stiffness of the bottom of the tower of the new wind turbine combined pumped storage structure: ; In the formula, is the elastic modulus, is the inner diameter of the tower, is the wall thickness of the tower.

[0048] According to the dimensions of the new wind power and pumped storage combined power generation device provided above, it is calculated that the bending stiffness of the tower bottom of the new wind turbine combined pumped storage structure is increased by 10 compared with the bending stiffness of the tower bottom of the original wind turbine structure. 2 times the magnitude.

[0049] (3) Calculation of anti-overturning force The new wind power and pumped storage combined power generation device is a self-supporting tall structure, and wind load is the main cause of lateral displacement and vibration of the wind tower. Due to the large capacity of the device, large wind rotor diameter, and high tower height, the wind load acting on the tower is very large, resulting in an increase in the overturning moment of the wind turbine. For the new wind power and pumped storage combined power generation device, since the height and windward area of ​​the upper water storage tank, tower and wind rotor blades are different, and the wind load acting on the tower wall varies greatly along the tower height, it is necessary to calculate the loads of the above three parts separately.

[0050] Combination Figure 6 As shown, the calculation method of the overall overturning moment and anti-overturning moment of the fan structure is explained.

[0051] Calculation of standard value of wind load per unit area on upper water storage tank and tower surface: ; In the formula, Acting on any height of the tower surface z The standard value of wind load at for z Wind vibration coefficient at height, is the wind load shape coefficient, is the wind pressure height variation coefficient, The basic wind pressure.

[0052] Calculation of horizontal load transferred to the top of the tower by the wind rotor blades: ; In the formula, is the air density, is the rated wind speed, is the fan blade radius, is the actual wind energy utilization coefficient, C P <0.593.

[0053] Calculation of overturning moment of new wind turbine combined pumped storage structure: ; Calculation of anti-overturning moment of new wind turbine combined pumped storage structure: ; in, is the overturning moment of the new wind turbine combined pumped storage structure, The anti-overturning moment of the new wind turbine combined pumped storage structure, is the height of the upper water storage tank, is the height of the tower above the upper water storage tank, is the base height, The base width, is the deadweight of the fan structure, It is the deadweight of the pumped storage device, including the deadweight of the upper water storage tank and water.

[0054] According to the dimensions of the new wind power and pumped storage combined power generation device provided above, and according to the calculation of the overturning moment of the structure under the most unfavorable state, it is calculated that the anti-overturning moment of the new wind turbine combined pumped storage structure in the embodiment of the present invention is much higher than the overturning moment.

[0055] According to the wind power and pumped storage combined power generation device proposed in the embodiment of the present invention, when the power grid is in a low load state, the pumped storage unit uses the wind generator to drive the motor to drive the water pump to rotate in the opposite direction, so as to pump the water in the lower water reservoir to the upper water tank for pumped storage; when the power grid is in a peak load state, the water in the upper water tank is released into the lower water reservoir, and the generator is driven by the turbine to generate electricity, so that the wind generator and the turbine supply power to the power grid at the same time. Thus, the problem of intermittency and volatility of existing wind power generation is solved. Compared with the existing technology, the structure of the present invention is simple and easy to control. The intermittent and volatility problems of existing wind power generation can be well solved by the combined power generation of wind power and pumped storage. An upper water storage tank is set outside the wind turbine tower and a lower water storage tank is set inside the wind turbine foundation. The water flow height difference is fully utilized to realize the power generation and energy storage of pumped storage, and the on-site energy storage service of renewable energy is realized. It can also effectively reduce the volume occupied by the pumped storage system, and the comprehensive development cost is low, and the requirements for water sources and terrain are low. It is suitable for plain wind farms with abundant wind resources but requiring auxiliary consumption by energy storage power stations. Secondly, the structure of the upper water storage tank and the lower water storage tank improves the rigidity of the tower structure and strengthens the anti-overturning ability of the tower.

[0056] Next, the wind power and pumped storage combined power generation method proposed according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0057] Figure 7 It is a flow chart of a method for combined power generation of wind power and pumped storage according to an embodiment of the present invention.

[0058] like Figure 7 As shown, the wind power and pumped storage combined power generation method comprises the following steps: In step S701, the current load state of the power grid is detected.

[0059] In step S702, if the current load state is at a low point, the electricity generated by the wind turbine is used to drive the water pump to rotate in the opposite direction through the motor to pump the water from the lower water reservoir to the upper water tank for pumped storage. When the load state is at a peak point, the water from the upper water tank is released into the lower water reservoir, and the generator is driven by the turbine to generate electricity, so that the wind turbine and the turbine supply power to the power grid at the same time.

[0060] Optionally, in some embodiments, the power supply capacity and load capacity of the wind turbine are in supply and demand balance, wherein the formula for supply and demand balance is:

[0061] in, The total power supply capacity for the wind turbine for one day, D all ( t ) is the daily load capacity of the fan, For the fan The power generation capacity at the moment, For pumped storage The power generation capacity converted from the potential energy of water at any moment, For water turbine pump Pumping power at the moment, for System load at any time.

[0062] It should be noted that the above explanation of the embodiment of the wind power and pumped storage combined power generation device is also applicable to the wind power and pumped storage combined power generation method of this embodiment, which will not be repeated here.

[0063] According to the wind power and pumped storage combined power generation method proposed in the embodiment of the present invention, the current load state of the power grid is detected; if the current load state is in the valley state, the electricity generated by the wind turbine is used to drive the water pump to rotate in the opposite direction through the motor, and the water in the lower water tank is pumped to the upper water tank for pumped storage. When the load state is in the peak state, the water in the upper water tank is released to the lower water tank, and the generator is driven by the turbine to generate electricity, so that the wind turbine and the turbine supply power to the power grid at the same time. Thus, the intermittent and fluctuating problems of existing wind power generation are solved, the structure is simple and easy to control, the upper water tank is set outside the wind turbine tower and the lower water tank is set inside the wind turbine foundation, and the water flow height difference is fully utilized to realize the power generation and energy storage of pumped storage, and the on-site energy storage service of renewable energy is realized, and the volume occupied by the pumped storage system can be effectively reduced, the comprehensive development cost is low, and the requirements for water sources and terrain are low, which is suitable for plain wind farms with abundant wind resources but requiring auxiliary consumption of energy storage power stations. Secondly, the structure of the upper water storage tank and the lower water reservoir improves the rigidity of the tower structure and strengthens the tower's anti-overturning ability.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

Claims

1. A wind power and pumped storage combined power generation device, characterized in that: include: Wind turbine, pumped storage unit, upper water storage tank and lower water storage tank, among which, An upper water storage tank is arranged at the bottom of the tower of the wind turbine generator, and the upper water storage tank is connected to the lower water storage tank through a pumping pipe. The lower water storage tank is arranged inside the foundation of the wind turbine generator, and the upper water storage tank is arranged on the top of the lower water storage tank. The pumped storage unit comprises a transformer, an electric motor, a water pump, a generator and a water turbine. The water turbine and the water pump are arranged on the pumping pipeline. The electric motor is connected to the water pump, the generator is connected to the water turbine, and both the electric motor and the generator are connected to the transformer. The pumped storage unit is used to drive the electric motor to drive the water pump to rotate in the opposite direction by the wind generator when the power grid is in a low load state, so as to pump water from the lower water reservoir to the upper water tank for pumped storage; when the power grid is in a peak load state, the water from the upper water tank is discharged into the lower water reservoir, and the generator is driven by the water turbine to generate electricity, so that the wind generator and the water turbine supply power to the power grid at the same time.

2. The wind power and pumped storage combined power generation device according to claim 1 is characterized in that: Also includes: An inspection passage is provided on one side of the upper water storage tank.

3. The wind power and pumped storage combined power generation device according to claim 1, characterized in that: The upper water storage tank is a cylindrical container formed by welding steel plates, and the wall thickness of the upper water storage tank is greater than or equal to a preset thickness.

4. The wind power and pumped storage combined power generation device according to claim 1, characterized in that: The upper water storage tank is welded and fixed to the outside of the wind turbine tower.

5. The wind power and pumped storage combined power generation device according to claim 1, characterized in that: The lower water reservoir is a cylindrical container, and concrete is poured around and on the bottom of the lower water reservoir for fixation.

6. The wind power and pumped storage combined power generation device according to claim 1, characterized in that: The upper water storage tank is coaxially arranged with the lower water storage tank, the upper water storage tank is located above the ground, and the lower water storage tank is located below the ground.

7. A method for combined power generation of wind power and pumped storage, characterized in that: The wind power and pumped storage combined power generation device according to any one of claims 1 to 6 is used, wherein the method comprises the following steps: Detect the current load status of the power grid; If the current load state is at a low point, the electricity generated by the wind turbine is used to drive the water pump to rotate in the opposite direction through the electric motor, and the water in the lower water reservoir is pumped to the upper water tank for pumped storage. When the load state is at a peak point, the water in the upper water tank is discharged to the lower water reservoir, and the generator is driven by the water turbine to generate electricity, so that the wind turbine and the water turbine supply power to the power grid at the same time.

8. The wind power and pumped storage combined power generation method according to claim 7, characterized in that: The power supply capacity and load capacity of the wind turbine generator are in supply and demand balance, wherein the formula for the supply and demand balance is: in, The total power supply capacity for the wind turbine for one day, D all ( t ) is the daily load capacity of the fan, For the fan t The power generation capacity at the moment, For pumped storage t The power generation capacity converted from the potential energy of water at any moment, is the pumping power of the turbine pump at time t, is the system load at time t.

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