CN218216700U

CN218216700U - Stable photovoltaic power generation system

Info

Publication number: CN218216700U
Application number: CN202221982818.4U
Authority: CN
Inventors: 刘祖明; 李杰慧; 孙建平; 李艳雄; 敖选; 金塍川
Original assignee: Yunnan Zy Energy Corp
Current assignee: Yunnan Zy Energy Corp
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-01-03
Anticipated expiration: 2032-07-29

Abstract

The utility model discloses a stable photovoltaic power generation system is in conventional photovoltaic water pump system's pump house, and newly-increased computer lab installation hydraulic turbine and generator are gone out the water end with original water lifting pipeline two and are made slightly to reform transform and just can satisfy the electricity generation and use. The water outlet end of a pump room water pump is provided with a branch water supply turbine, and water is extracted into a high-level water tank through a photovoltaic water pump in the daytime; increase one and be connected to the trunk line from pond bottom drainage pipe, can be used for the sewer pipe-line of electricity generation with the water lift pipeline of original photovoltaic pump station when the evening power consumption peak to obtain stable electricity generation and incorporate into the electric wire netting. The system constructs the original photovoltaic pump station into a novel energy system which has the functions of water lifting and pumped storage stable power generation at the same time, is a distributed novel small photovoltaic pumped storage power station, and can realize stable photovoltaic water pump surplus power grid connection.

Description

Stable photovoltaic power generation system

Technical Field

The utility model relates to an utilize photovoltaic water pump water lift energy storage to carry out the system of electricity generation, in particular to stable photovoltaic power generation system, this system can carry out photovoltaic water pump water lift energy storage, can rationally utilize the energy storage again to carry out hydroelectric power generation and be incorporated into the power networks with the surplus electricity.

Background

The photovoltaic water pumping is a mature photovoltaic technology, and generally comprises a water source, a high-level water pool, a pipeline, a photovoltaic matrix, a water pump and a control inversion system. Early photovoltaic water pumps were primarily used for potable water, almost daily, and the system scale was small.

In recent years, photovoltaic water pump water pumping is widely applied to irrigation water pumping in water-deficient areas, the systems have high power, most of the systems are independent systems, system capacity is configured according to irrigation requirements in dry seasons, the systems are usually in a state of large surplus power generation or even an idle state in other periods, in order to fully play a role in photovoltaic power generation, although a photovoltaic power generation system can be directly connected to the grid for power generation, a conventional photovoltaic grid-connected power generation technology is used, but with the rapid increase of installed capacities of photovoltaic power generation and wind power generation in China, the unstable power supplies cannot be increased in many counties, and therefore the conventional photovoltaic direct grid-connected power generation is more and more restricted.

Because photovoltaic power generation depends on solar radiation for power generation, the solar radiation is fluctuated and cannot be controlled, most of large photovoltaic power stations are required to be forcibly configured with energy storage, most of the large photovoltaic power stations are required to be configured with 10% of power for 2 hours for energy storage, and a chemical power supply-storage battery is basically used.

The traditional pumped storage power station is a very mature technology, but is generally a large or oversize system, which comprises an upper reservoir used for pumping and storing energy by utilizing residual energy in off-peak time periods and a lower reservoir used for draining and generating electricity in peak time periods, wherein the pumped storage scheme can be used for large-capacity long-time storage, the efficiency of the system is usually 70-85%, and the system is the most economic large-scale energy storage mode at present. Because the pumped storage power station needs to build two reservoirs and requires the formation of a terrain height difference between the two reservoirs, the site selection requirement of the pumped storage power station is high, the requirement can be met only by special terrain, and the manufacturing cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stable photovoltaic power generation system to point out the not enough of two kinds of techniques existence separately in solving above-mentioned background art, realize stable photovoltaic power generation and be incorporated into the power networks.

The photovoltaic water pump water lifting system comprises a water source, a high-level water pool or water storage system, a pipeline, a water pump and a green photovoltaic power generation system, and also has a required terrain height difference, the water pumping energy storage can be realized only by adding one hydraulic power generation system (certainly, a power grid needs to be erected to ensure outward power transmission, the reliability of a pump station is also improved by the power grid, the water pumping can be ensured by using the power grid for supplying power when sunlight is weak and at night when multiple water is needed), the photovoltaic power generation in non-irrigation seasons is fully utilized, unstable photovoltaic power generation is converted into stable hydropower, the property of unstable photovoltaic power generation is fundamentally changed, the defect that the electric quantity cannot be ensured by the photovoltaic power generation is overcome, the limitation that an unstable power supply can only be connected into the power grid in a certain proportion is also overcome, the cheapest and reliable long-time energy storage is provided, the photovoltaic water pumping system is combined with a novel distributed water pumping power station, and is combined with a large photovoltaic power station or pump station to form a large-scale stable photovoltaic power generation system.

The technical scheme of the utility model is realized like this: in the pump room of conventional photovoltaic water pump system, or newly-increased computer lab installation hydraulic turbine and generator, just can satisfy the electricity generation and use with the outlet end of original water lifting pipe both ends slightly transformation. Namely, a water outlet end of a pump room water pump is provided with a branch water supply turbine, and water is extracted into a high-level water pool through a photovoltaic water pump in the daytime; a water lifting pipeline of an original photovoltaic pump station can be used as a sewer pipeline for power generation in the evening peak power utilization period, so that stable power generation can be obtained and incorporated into a power grid. In another scheme, a sewer pipe can be added again, so that power can be generated at any time, power grid dispatching is facilitated, power generation is more convenient, and the system can also be used as a stable power generation grid-connected system of a large photovoltaic power station.

Specifically, the utility model discloses a: the system comprises a water pump and a hydraulic generator which are arranged in parallel at a water source end, a water pumping electric gate valve at the outlet end of the water pump, a power generation electric gate valve at the inlet end of the hydraulic generator, a one-way valve at a high-level water pool end, a shared channel between the three-way channel and the one-way valve, a photovoltaic power generation inlet and a photovoltaic water pump control inverter which supply power to the water pump and the electric gate valve, and a grid-connected synchronous parallel control system which is used for connecting the power generation of the hydraulic generator to an alternating current power grid.

The utility model discloses can also realize like this: the electric water-pumping gate valve of the outlet pipeline of the water pump is replaced by a one-way valve, and a sewer pipe is additionally arranged. A gate valve can be added on the water outlet pipeline at the bottom of the high-level water tank for use when the pipeline is maintained.

Preferably, the system further comprises a grid-connected synchronous parallel control system for connecting the power generation of the hydraulic generator into an alternating current power grid, and the grid-connected synchronous parallel control system is used for automatically connecting the grid to meet the peak regulation and frequency regulation requirements of the power grid through automatic control or remote control by the power grid.

Preferably, the water pump is powered by a power grid to lift water when solar radiation is weak or at night.

Preferably, the elevated water tank is used to collect and utilize rainwater to generate electricity hydroelectrically during rainy season when solar energy is poor.

Compared with the prior art, the beneficial effects of the utility model are that:

it needs to build high-order pond alone to have practiced thrift pumped storage, and need unnecessary electric power could carry out the water lift, show and reduced conventional pumped storage construction investment, full play irrigates photovoltaic pump station photovoltaic power generation ability in non-irrigation season, it can not exert a function and cause extravagant difficult problem to have solved non-irrigation season photovoltaic pump system, construct original photovoltaic pump station and become the novel energy system who has water lift function and pumped storage stable power generation function simultaneously, it is a distributed novel small photovoltaic pumped storage power station, can realize stable photovoltaic pump residual electricity and be incorporated into the power networks. Meanwhile, the connection of the power grid is also beneficial to water lifting in the dry seasons due to weak sunlight and at night by using the power grid, the water lifting capacity is obviously increased, the function of equipment is fully exerted, and the emergency water demand is met. In rainy season, the solar energy is not good, and rainwater can be collected to increase the hydroelectric power generation capacity. The function of the device can be effectively exerted in dry seasons and rainy seasons. The grid-connected inverter can also be used as a stable grid-connected power generation system which is combined with a large-scale photovoltaic power station and used for stabilizing photovoltaic power generation fluctuation, and impact and influence of the traditional photovoltaic grid-connected inverter on a power grid are completely avoided.

Drawings

Fig. 1 is a schematic structural diagram of a common water lifting pipe system for power generation pipes in embodiment 1.

Fig. 2 is a schematic structural view of a system for separately constructing a power generation water pipe in embodiment 2.

In the figure: the system comprises a water pump 1, a photovoltaic power generation inlet 2, a photovoltaic water pump control inverter 3, a water pumping electric gate valve 41, a power generation electric gate valve 42, a shared pipeline 5, a one-way valve 6, a high-level water tank 7, a low-level water tank 8 or a water source 9, a grid-connected synchronous parallel control system 10, a hydraulic generator 11, an alternating current power grid and a sewer pipe 12.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments or the prior art will be briefly introduced below, and the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: water lifting pipeline system shared by power generation pipelines

Fig. 1 illustrates a novel photovoltaic water pump pumped storage system sharing a power generation pipeline water lifting pipeline, which includes: the water pump 1 and the hydraulic generator 10 are arranged at the end of the water source 8 in parallel, the electric pumping gate valve 41 is arranged at the outlet end of the water pump 1, the electric generating gate valve 42 is arranged at the inlet end of the hydraulic generator 10, the electric pumping gate valve 41 is communicated with one end of the electric pumping gate valve 42 through a three-way pipe at the machine room end, the check valve 6 is arranged at the upper part of the high-level water tank 7 and the communicating pipe is arranged at the bottom of the high-level water tank 7, and the check valve 6 is communicated with the communicating pipe through a three-way pipe at the water tank end; the system comprises a common pipeline 5 for communicating a three-way pipeline at a machine room end with a three-way pipeline at a water pool end, a photovoltaic power generation inlet 2 for supplying power to a water pump 1 and an electric gate valve 4, and a photovoltaic water pump control inverter 3, wherein the power generation of a hydraulic generator 10 is synchronized into a synchronization parallel control system 9 of an alternating current power grid 11.

When water is pumped, the water pumping electric gate valve 41 on the water pump 1 side is opened, and the power generation electric gate valve 42 on the hydraulic generator 10 side is closed; in contrast, during power generation, the electric pumping gate valve 41 on the water pump 1 side is closed, and the electric power generation gate valve 42 on the hydraulic generator 10 side is opened. The shared pipeline 5 is shared and is a water lifting pipeline for water feeding and a water conveying pipeline for power generation by water discharging. A water outlet pipeline from the bottom of the water pool is additionally arranged on an original water inlet pipeline from the top of the water pool of the high-level water pool 7, a one-way valve 6 is arranged on the water outlet pipeline from the top, and the valve can be closed when water is not lifted, so that cavitation of air entering the pipeline to a water turbine impeller is prevented. A gate valve can also be added on the water outlet pipeline at the bottom of the high-level water tank 7 for use when the pipeline is repaired. The volume of a high-level water tank of a general photovoltaic water pump system is specified to meet daily water lifting amount of three days, the general photovoltaic water pump is designed according to full load lifting of about 5 hours, and even if a small amount of water surface evaporation loss is considered, the general system can store energy for at least 12 hours for a long time (the power of a water wheel generator is the same as that of a water pump motor). The grid-connected synchronous parallel control system 9 can be a commercially available product, and the commercially available product can be remotely controlled, automatically operated at regular time or manually controlled to operate according to the requirement of a power grid, so that the residual power can be connected to the grid.

This system is through photovoltaic power generation direct drive water pump lift by water daytime, opens the electronic gate valve 41 that draws water this moment, and electricity generation electronic gate valve 42 closes. At night, the electric power generating gate valve 42 is opened, the electric water pumping gate valve 41 is closed, and the hydraulic generator 10 generates electric power. When both the devices are stopped, the electric gate valve 41 and the electric gate valve 42 are closed.

Example 2: water lifting and power generation independent use pipeline system

Fig. 2 illustrates a novel photovoltaic water pump pumped storage system with independent pipes for water pumping and power generation, the symbol in the figure is basically the same as that in fig. 1, except that a pumped electric gate valve 41 of the outlet pipe of the water pump 1 is replaced by a one-way valve, and a sewer pipe 12 is added. A gate valve can also be added on the water outlet pipeline at the bottom of the high-level water tank 7 for use in maintaining the pipeline.

The system directly drives the water pump 1 to lift water through photovoltaic power generation in daytime. At night or at any time, the power grid needs to be supplemented with power supply to generate the power, the electric gate valve 42 is opened, and the hydraulic generator 10 can generate power without mutual influence. When the hydraulic generator 10 does not generate power, the power generation motor gate valve 42 is closed.

Claims

1. A stabilized photovoltaic power generation system, comprising: the water pump (1) and the hydraulic generator (10) are arranged at the end of the water source (8) in parallel, the electric pumping gate valve (41) is arranged at the outlet end of the water pump (1), the electric generating gate valve (42) is arranged at the inlet end of the hydraulic generator (10), and the electric pumping gate valve (41) is communicated with one end of the electric generating gate valve (42) through a three-way pipeline at the machine room end; the device comprises a check valve (6) positioned at the upper part of a high-level water tank (7) and a communicating pipe positioned at the bottom of the high-level water tank (7), wherein the check valve (6) is communicated with the communicating pipe through a three-way pipeline at the tank end; the common pipeline (5) for communicating the three-way pipeline at the machine room end and the three-way pipeline at the water pool end is a photovoltaic power generation inlet (2) and a photovoltaic water pump control inverter (3) which supply power for the water pump (1), the water pumping electric gate valve (41) and the power generation electric gate valve (42).

2. A stabilized photovoltaic power generation system, comprising: the water pump control system comprises a water pump (1) and a hydraulic generator (10) which are arranged at the end of a water source (8) in parallel, a water pumping electric gate valve (41) which is arranged at the outlet end of the water pump (1), a power generation electric gate valve (42) which is arranged at the inlet end of the hydraulic generator (10), a one-way valve (6) which is arranged at the end of a high-level water pool (7), a shared pipeline (5) which is arranged between the power generation electric gate valve (42) and the one-way valve (6), a sewer pipe (12) of which one end is arranged at the bottom of the high-level water pool (7) and the other end is connected with the power generation electric gate valve (42), and a photovoltaic power generation inlet (2) and a photovoltaic water pump control inverter (3) which supply power for the water pump (1) and the power generation electric gate valve (42).

3. The stable photovoltaic power generation system according to claim 1 or 2, further comprising a grid-connected and synchronous parallel control system (9) for grid-connecting the power generation of the hydro-generator (10) into the alternating current grid (11), wherein the grid-connected and synchronous parallel control system (9) is automatically controlled or remotely controlled by the grid and is used for automatically grid-connecting to meet the peak and frequency modulation requirements of the grid.

4. Stabilized photovoltaic power generation system according to claim 3, characterized in that the water pump (1) is powered by the electricity network for water lift when solar radiation is weak or at night.

5. Stabilized photovoltaic power generation system according to claim 3, characterized in that the elevated basin (7) is used to collect and use rainwater for hydroelectric power generation in rainy seasons with poor solar energy.