CN103607054A - Distributed solar pumped storage power station - Google Patents

Abstract

The invention discloses a distributed solar pumped water storage power station, comprising: several solar panel arrays for converting solar energy into electric energy; The motor (the inverter with high failure rate and high price is omitted), the DC motor is connected to the water pump, and the water pump is connected to the high-level water tower. The high-level water tower includes a storage tank and a high-level water tower, and the high-level water tower is connected to the hydroelectric power generation through pipelines machines, hydroelectric generators connected to the grid. The solar panel array utilizes sufficient solar energy during the day. On the one hand, the DC motor drives the water pump to transport water from the low-level reservoir to the high-level reservoir, thereby converting solar energy into water and storing the potential energy; on the other hand, it transmits electricity to the grid through a generator; When there is no solar energy, water can also be discharged from the high-level water fort to the low-level reservoir according to the needs of the grid to drive the hydroelectric generator to generate electricity for the grid.

Description

Distributed solar pumped water storage power station

technical field

The invention relates to a solar energy storage device, in particular to a distributed solar pumped water storage power station.

Background technique

For a long time, in order to meet the requirements of electric load, the power sector has to build power generation capacity according to the maximum load requirement. On the one hand, this has caused a large amount of surplus and waste of power generation capacity. On the other hand, the power sector has to often limit power consumption during peak hours of power consumption. Therefore, there is an urgent need for an economical, reliable and efficient power storage system to match it. More importantly, the electric energy storage system is currently one of the most important bottlenecks restricting the large-scale utilization of renewable energy. At present, the main renewable energy sources, such as wind energy, solar energy, tidal energy, etc., are all intermittent energy sources. How to use energy storage technology to "splicing" these intermittent energy sources is a problem that must be solved to increase the proportion of renewable energy. At the same time, the electric energy storage system is also a key technology of the distributed energy system. Distributed energy systems use a large number of small distributed power systems to replace conventional large-scale centralized power systems, which have the advantages of comprehensive energy utilization, high thermal efficiency, and low pollution. But at the same time, the system failure rate caused by lines, operation and other reasons will be higher than that of conventional large-scale centralized power systems. Moreover, due to the small capacity of the system, the fluctuation of the system load will also increase significantly. Therefore, the use of electric energy storage systems as load balancing devices and backup power sources is a measure that must be considered in distributed energy systems.

New energy must meet two conditions at the same time: first, it has abundant reserves and will not be exhausted; second, it is safe and clean, and will not threaten human beings or damage the environment. Solar energy, as a clean and renewable new energy source, is more and more favored by people and has a wide range of functions in people's life and work. One of its uses is to convert solar energy into electrical energy.

The solar energy irradiated on the earth is very huge, and the solar energy irradiated on the earth in about 40 minutes is enough for the energy consumption of human beings all over the world for one year. It can be said that solar energy is truly inexhaustible and inexhaustible energy. Moreover, solar power generation is absolutely clean and does not produce pollution. So solar power is known as an ideal energy source.

The disadvantages of solar energy are: ①The energy distribution density of irradiation is small, that is, it will occupy a huge area; ②The energy obtained is related to the weather conditions such as four seasons, day and night, and cloudy or sunny. To make solar power generation truly practical, one is to improve the efficiency of solar photoelectric conversion and reduce its cost, and the other is to realize the interconnection of solar power with the power grid.

In order to solve the problems of time limit and unstable output of solar energy, the construction of electric energy storage system is particularly important. At present, the existing electric energy storage technologies include pumped water energy storage, compressed air energy storage, batteries, superconducting magnetic energy, flywheels and capacitors. However, due to capacity, energy storage period, energy density, charge and discharge efficiency, lifespan, operating costs, environmental protection and other reasons, only pumped water energy storage and compressed air energy storage have been used in large-scale commercial systems. The pumped water storage system has the advantages of mature technology, high efficiency, large capacity, and unlimited energy storage period, and is currently a widely used power energy storage system.

Contents of the invention

In order to solve the problem that solar energy intermittently appears and a large amount of solar energy cannot be utilized, the present invention provides a distributed solar energy pumping energy storage power station, which uses sufficient solar energy during the day to send water from a closed low-level reservoir to high-level water through a water pump. Fort, so that the potential energy of solar energy into water is stored. When the solar energy cannot be used at night, the water is discharged from the high-level water fort to the low-level reservoir to drive the hydroelectric generator to generate electricity. Improve the utilization rate and timeliness of solar energy, turn unstable and uncontrollable solar energy into electric energy according to the peak and valley demand of the grid, and better solve the problem of grid-connected power generation. The present invention is solved by following technical scheme:

A distributed solar pumped water storage power station, including: several solar panels, used to convert solar energy into electrical energy; as we all know, what the solar panels send is direct current, and the solar panels are also connected to the DC motor (saved High failure rate, expensive inverter), the DC motor is connected to the water pump, and the water pump is connected to the high-level water tower. The high-level water tower includes a reservoir and a high-level water castle. Connect to grid. The solar panel array utilizes sufficient solar energy during the day. On the one hand, the DC motor drives the water pump to transport water from the low-level reservoir to the high-level water castle, thereby converting solar energy into potential energy of water and storing it; Power transmission; when there is no solar energy, water can also be discharged from the high-level water castle to the low-level reservoir to drive the hydroelectric generator to generate electricity for the grid according to the needs of the grid.

For a further improvement of the above technical solution, the solar panels are arranged in a distributed array, each array of solar panels is connected to a DC motor, and each DC motor is connected to a water pump. The number and position of solar panels arranged in a distributed array can be arranged according to actual needs, and the normal operation of the DC motor and water pump can be guaranteed. When each array fails, it can be repaired independently without affecting the operation of other arrays.

For the further improvement of the above technical solution, the voltage of the DC motor is 400-600V.

For the further improvement of the above technical solutions, the output power of the solar panels of each array is 200KW or above.

For the further improvement of the above technical solution, the high-level water castle is also connected with a water turbine. A water turbine converts the energy of water flow into rotational mechanical energy.

For further improvement of the above technical solution, the hydraulic turbine is fixedly connected to the transmission shaft of the hydroelectric generator. A hydroelectric generator is driven by a water turbine to generate electricity.

For the further improvement of the above technical solution, the water storage tank is a closed storage tank. The closed storage tank has the effect of antifreeze and heat preservation. The thickness of the heat preservation and antifreeze layer should be determined according to the local climate conditions and the maximum depth of the permafrost layer to ensure that the water in the pool does not freeze and be damaged by frost heaving, so as to ensure the normal operation of the solar pumped energy storage system.

The beneficial effects of the present invention are:

Using sufficient solar energy during the day to send water from the low-level reservoir to the high-level reservoir through the water pump, so as to convert the solar energy into the potential energy of water and store it. On the one hand, the DC motor drives the water pump to transport the water from the low-level reservoir to the high-level reservoir, thereby converting solar energy. Store the potential energy of water; on the other hand, transmit electricity to the grid through the generator; when there is no solar energy, it can also discharge water from the high-level reservoir to the low-level reservoir to drive the hydroelectric generator to generate electricity for the grid according to the needs of the grid. Energy saving and environmental protection, the energy storage cycle is not limited; effectively improve the utilization rate of solar energy, stabilize the output power of solar power generation; unit solar panel array failure, can be repaired and checked separately, without affecting the normal operation of the power station as a whole.

Description of drawings

Fig. 1 is the whole work flowchart of the present invention;

Fig. 2 is the structural representation of water tower of the present invention;

Among them: 1-closed low-level water storage tank, 2a-water pump, 2b-water pump, 2c-water pump, 2d-water pump, 3-hydraulic generator, 4-high water castle.

Detailed ways

Taking four sets of solar cell panel arrays as an example, the present invention will be further described in detail in conjunction with the accompanying drawings and specific implementation methods:

Referring to Figure 1, a distributed solar pumped water storage power station includes: a number of solar panels for converting solar energy into electrical energy; the solar panels are also connected to a DC motor, which is connected to a water pump, and the water pump is connected to a high-level water tower , the high-level water tower includes an interconnected reservoir 1 and a high-level water fort 4, the high-level water fort 4 is connected to the hydroelectric generator 3 through a pipeline, and the hydroelectric generator 3 is connected to the grid. The high-level water castle 4 is also connected with a water turbine. A water turbine converts the energy of water flow into rotational mechanical energy. The transmission shaft of the water turbine and the hydroelectric generator 3 is fixedly connected. The hydroelectric generator 3 is driven by the water turbine to generate electricity. The solar panels are arranged in a distributed array, each array of solar panels is connected to a DC motor, and each DC motor is connected to a water pump. In this embodiment, as shown in Figure 2, four solar panel arrays are connected to four DC motors to drive four water pumps 2a, 2b, 2c, and 2d to pump the water in the reservoir 1 into high-level water respectively. Fort 4. In order to make the water pump work normally, the voltage of the DC motor is 400-600V, therefore, the output power of the solar panels of each array is 200KW or above. The number and position of solar panels arranged in a distributed array can be arranged according to actual needs, and the normal operation of the DC motor and the water pump can be guaranteed. When each array fails, it can be repaired independently without affecting the operation of other arrays.

The working process of the embodiment of the present invention is shown in Figure 1. On the one hand, four water pumps are driven by four DC motors to transport water from the low-level reservoir 1 to the high-level water castle 4, thereby converting solar energy into potential energy of water and storing it. According to the electricity demand of the grid, the water is discharged from the high-level water fort 4 to the low-level reservoir 1, and the water flow drives the water turbine to rotate, and drives the hydroelectric generator 3 to generate electricity, providing controllable and stable power for the grid.

In order to meet the needs of various environments, the reservoir 1 of the present invention is a closed reservoir. The closed storage tank has the effect of antifreeze and heat preservation. The thickness of the heat preservation and antifreeze layer should be determined according to the local climate conditions and the maximum depth of the permafrost layer to ensure that the water in the pool does not freeze and be damaged by frost heaving, so as to ensure the normal operation of the solar pumped energy storage system.

A distributed solar pumped water storage power station provided by the present invention has been introduced in detail above. For those of ordinary skill in the art, based on the idea of the embodiment of the present invention, there will be changes in the specific implementation and application range , For example, what is given in the accompanying drawings is only a case of this embodiment. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (7)

1. the distributed solar energy energy-accumulating power station that draws water, comprising:

Some solar panels, for converting solar energy to electric energy;

It is characterized in that, described solar panel also connects direct current machine, and direct current machine connects water pump, by water pump, be communicated with the closed cistern of low level, the water of low level cistern is delivered to high-order water fort, and high-order water fort connects hydroelectric generator by pipeline, and hydroelectric generator is connected to electrical network.

2. the distributed solar energy according to claim 1 energy-accumulating power station that draws water, it is characterized in that: described solar panel is distributive array and arranges, the solar panel of every an array is connected to a direct current machine, and each direct current machine is connected to a water pump.

3. the distributed solar energy according to claim 2 energy-accumulating power station that draws water, is characterized in that: the voltage of described direct current machine is 400-600V.

4. the distributed solar energy according to claim 2 energy-accumulating power station that draws water, is characterized in that: the solar panel power output of every an array be 200KW or more than.

5. the distributed solar energy according to claim 1 energy-accumulating power station that draws water, is characterized in that: described high-order water fort is also connected with the hydraulic turbine.

6. the distributed solar energy according to claim 5 energy-accumulating power station that draws water, is characterized in that: the described hydraulic turbine and the power transmission shaft of hydroelectric generator are affixed.

7. the distributed solar energy according to claim 1 energy-accumulating power station that draws water, is characterized in that: described cistern is closed cistern.

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