CN113890100A - Mountain area water supply and power supply system based on photovoltaic miniature pumped storage - Google Patents

Mountain area water supply and power supply system based on photovoltaic miniature pumped storage Download PDF

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Publication number
CN113890100A
CN113890100A CN202111252432.8A CN202111252432A CN113890100A CN 113890100 A CN113890100 A CN 113890100A CN 202111252432 A CN202111252432 A CN 202111252432A CN 113890100 A CN113890100 A CN 113890100A
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China
Prior art keywords
water
photovoltaic
mountain
mountain area
pumped storage
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CN202111252432.8A
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Chinese (zh)
Inventor
张鹏
陈昕
刘海波
陶铁铃
何杰
曹龙
汪建
胡超
刘爽
吴焱琦
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Priority to CN202111252432.8A priority Critical patent/CN113890100A/en
Publication of CN113890100A publication Critical patent/CN113890100A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B11/00—Arrangements or adaptations of tanks for water supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Power Engineering (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • Ocean & Marine Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The invention relates to a mountainous area water supply and power supply system based on photovoltaic miniature pumped storage, which comprises an upper reservoir, a lower reservoir, a mountainous area photovoltaic square matrix and a water surface floating type photovoltaic square matrix, wherein one end of the upper reservoir is connected with the lower reservoir through a water conveying pipeline, and the other end of the upper reservoir is connected with a mountainous area water system; the upper reservoir adopts a water storage tank of a mountainous area water lifting irrigation system, and the lower reservoir adopts a natural river or a water pool under the mountains; meanwhile, a mountain photovoltaic square matrix is built in the open space or the wasteland of the mountain area, and a water surface floating type photovoltaic square matrix is built in a reservoir under the mountain. The system not only provides power and energy storage service for the micro-grid in the mountainous area, but also can solve the problems of living water supply and agricultural irrigation in the mountainous area. The system combines a photovoltaic power station, a miniature pumped storage system and a mountain area water lifting irrigation system, and has self-power supply capability and self-water supply capability aiming at the mountain area with good photovoltaic resource conditions and water supply requirements.

Description

Mountain area water supply and power supply system based on photovoltaic miniature pumped storage
Technical Field
The invention relates to the technical field of new energy power generation, in particular to a photovoltaic micro pumped storage based mountain water supply and power supply system.
Background
The operation characteristics of renewable energy power generation systems such as photovoltaic systems and the like are the random fluctuation characteristics of output, and the random fluctuation is not only the result of the influence of various external conditions such as weather conditions and the like, but also the result of unstable supply and demand relations of a power system. For a micro-grid system, on one hand, the fluctuation of the output of new energy has negative influence on the safe and stable operation of a power system; on the other hand, when the electric power is excessive, the new energy cannot be reasonably utilized, and the electric power loss of the new energy is caused. If the influence caused by random fluctuation of renewable energy sources is to be thoroughly solved, a proper energy storage technology needs to be adopted for matching.
In 2020, 4820 ten thousand kilowatts are additionally arranged in the national photovoltaic system, wherein a centralized photovoltaic power station 3268 ten thousand kilowatts and a distributed photovoltaic power station 1552 ten thousand kilowatts are arranged. From the layout of the new loading machine, the middle east and south regions account for about 36 percent, and the three north region accounts for 64 percent. In 2020, the average number of photovoltaic utilization hours in the country is 1160 hours, the average light abandoning rate in the country is 2%, and the light abandoning rate in the northwest area with the prominent photovoltaic absorption problem is 4.8%. Therefore, the problem of photovoltaic electricity abandonment in partial provinces is still not negligible. The pumped storage power station has the advantages of low investment cost, long service life, large scale and centralized energy storage, is the most deployed energy storage mode so far, and occupies an absolute dominant position in the energy storage market. By the end of 2019, the accumulated scale of the energy storage projects operated in China is 32.3GW, wherein the total number of the pumped-storage power stations is 32, and the installed capacity is 3029 ten thousand kilowatts, which accounts for 93.70%.
In recent years, off-grid photovoltaic water lift systems in remote areas have been developed considerably. The photovoltaic water lifting system consists of four main parts, namely a photovoltaic square matrix, a power regulating unit, a motor and a water pump. If the photovoltaic water pumping system can be properly modified, the photovoltaic water pumping system has the capacity of water pumping and irrigation, and also has the capacity of energy storage and power generation, so that the power supply reliability of remote areas can be greatly improved.
Disclosure of Invention
In order to solve the problems, the invention provides a mountain area water supply and power supply system based on photovoltaic micro pumped storage, which combines a photovoltaic power station, a micro pumped storage and a mountain area water lifting irrigation system, so that the system has self-power supply capability and self-water supply capability.
The technical scheme adopted by the invention is as follows: the utility model provides a mountain area water supply power supply system based on miniature pumped storage of photovoltaic which characterized in that: the system comprises an upper reservoir, a lower reservoir, a mountain photovoltaic matrix and a water surface floating type photovoltaic matrix, wherein the upper reservoir adopts a water storage tank of a mountain area water lifting irrigation system, the lower reservoir adopts a mountain area natural river or a water pool, the mountain area photovoltaic matrix is built in an empty land or a wasteland of the mountain area, and the water surface floating type photovoltaic matrix is built in the mountain area reservoir; one end of the upper reservoir is connected with the lower reservoir through a water conveying pipeline, and the other end of the upper reservoir is connected with a water using system in a mountainous area; and a pumped storage power generation motor set is arranged between the upper reservoir and the lower reservoir, and the pumped storage power generation motor set, the mountain photovoltaic square matrix and the water surface floating type photovoltaic square matrix are connected into a power grid through power transmission lines.
Preferably, the pumped storage power generation motor unit is arranged in a power generation plant under a mountain.
Preferably, the pumped storage power generation motor unit comprises two variable speed units arranged in parallel, one is a generator, and the other is a motor.
Further, the generator and the motor both adopt a double-fed asynchronous generator.
Further, the rotor terminal of the generator is connected to one group of back-to-back converters, and the rotor terminal of the motor is connected to the other group of back-to-back converters; and the stator wiring terminals of the generator and the motor share one unit transformer to be connected with a power grid.
Furthermore, when the photovoltaic output is excessive, the mountain photovoltaic square matrix and the water surface floating type photovoltaic square matrix provide power loads for mountainous areas, and meanwhile, the residual output of the mountain photovoltaic square matrix and the water surface floating type photovoltaic square matrix provides electric energy for driving the motor to lift water into the mountain water storage tank.
Furthermore, when the photovoltaic output is insufficient, water is discharged from the mountain water storage tank, and the generator generates electricity to compensate power supply of a mountain area.
The beneficial effects obtained by the invention are as follows: the upper reservoir adopts a water storage tank of a mountainous area water lifting irrigation system, and the lower reservoir adopts a natural river or a water pool under the mountains; meanwhile, a mountain photovoltaic square matrix is built in the open space or the wasteland of the mountain area, and a water surface floating type photovoltaic square matrix is built in a reservoir under the mountain. The system not only provides power and energy storage service for the micro-grid in the mountainous area, but also can solve the problems of living water supply and agricultural irrigation in the mountainous area. The system combines a photovoltaic power station, a miniature pumped storage system and a mountain area water lifting irrigation system, and has self-power supply capability and self-water supply capability aiming at the mountain area with good photovoltaic resource conditions and water supply requirements.
Drawings
FIG. 1 is a schematic diagram of the present invention when photovoltaic power generation is used for pumping water to a mountain area for irrigation and a water storage tank is used for storing water and energy;
FIG. 2 is a schematic diagram of the present invention when the water storage tank is drained to generate electricity to compensate for power supply in mountainous areas;
FIG. 3 is a schematic electrical wiring diagram of the present invention;
reference numerals: 1. a water storage tank (upper reservoir); 2. a lower reservoir; 3. a water surface floating type photovoltaic square array; 31. a photovoltaic circuit breaker; 32. a photovoltaic box transformer substation; 33. a photovoltaic high voltage circuit breaker; 4. a mountain photovoltaic square matrix; 5. underground power plants (pumped storage generator-motor sets); 51. a water turbine; 52. a generator; 53. an electric motor; 54. a circuit breaker; 55. micro-pumping three-circle box transformer substation; 56. a micro-pumped high voltage circuit breaker; 57. a back-to-back converter; 6. a water delivery pipeline; 7. farmland in mountainous areas; 8. electrical loads in mountainous areas; 9. and (5) power transmission line.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in fig. 1-3, the mountain area water supply and power supply system based on photovoltaic micro pumped storage of the invention comprises an upper reservoir 1, a lower reservoir 2, a mountain area photovoltaic square matrix 4 and a water surface floating type photovoltaic square matrix 3, wherein the upper reservoir 1 adopts a water storage tank of a mountain area water lifting irrigation system, the lower reservoir 2 adopts a mountain area natural river or a water pool, the mountain area photovoltaic square matrix 4 is built in the mountain area open land or wasteland, and the water surface floating type photovoltaic square matrix 3 is built in the mountain area lower reservoir 2; one end of the upper reservoir 1 is connected with the lower reservoir 2 through a water conveying pipeline, and the other end of the upper reservoir is connected with a water system (agricultural irrigation, domestic water, photovoltaic cleaning and the like) in mountainous areas; a pumped storage power generation motor set 5 is arranged between the upper reservoir 1 and the lower reservoir 2, and the pumped storage power generation motor set 5, the mountain photovoltaic square matrix 4 and the water surface floating type photovoltaic square matrix 3 are connected into a power grid through a power transmission line 9.
The invention adopts the arrangement mode that the water storage tank of the mountainous area water lifting irrigation system is an upper reservoir 1, and the natural river or water pool under the mountains is a lower reservoir 2. Meanwhile, a mountain photovoltaic square matrix 4 is built in the open space or the wasteland of the mountain area, and a water surface floating type photovoltaic square matrix 3 is built in a reservoir under the mountain. In order to combine the micro pumping storage system with the water supply system in the mountainous area, one end of the water storage tank 1 on the mountains is connected with the reservoir 2 under the mountains through a pressure water pipe, and the other end is connected with the water supply system in the mountainous area. When the micro-pumping storage system works under the working condition of a motor (water pump), for example, when the power load is high in daytime, the mountain photovoltaic square matrix provides the power load of a mountain area, and meanwhile, the residual output of the mountain photovoltaic square matrix 4 and the water surface floating type photovoltaic square matrix 3 provides electric energy for driving the motor (water pump), so that water is extracted into the mountain water storage tank 1 for water loads such as agricultural irrigation, domestic water and photovoltaic cleaning; when the micro pumping storage system works under the power generation working condition (the generator in the pumped storage power generation motor set works), for example, when the power load is low at night, the water storage tank on the mountain drains water to generate power so as to compensate the power supply output of the system.
The lower reservoir 2 has lower requirement on water quantity, and the water quantity sources can be the following two conditions for different planned areas: the first is to use local built reservoir or natural lake, pond as the lower reservoir 2; the second is that when the lower reservoir 2 has no natural water source or insufficient water, the lower reservoir 2 needs to be excavated first, then the nearby water source is introduced for filling once, and the evaporation water amount and the leakage water amount are dynamically supplemented. For mountainous areas lacking a large amount of water sources, because micro pumping storage is built for matching with a single photovoltaic power station, the energy storage capacity and the building scale are not large, and the required water diversion amount and the engineering amount for excavating a reservoir are far lower than those of a conventional pumped storage power station no matter which of the two methods is adopted.
An important indicator of the operation of the invention is the time to switch between the energy generation stage and its storage stage, which requires a faster and more accurate response of the energy storage unit to the power generation system. According to the invention, the pumped storage power generation motor unit is arranged in the mountain power generation plant 5, the pumped storage power generation motor unit comprises two variable speed units which are arranged in parallel, one variable speed unit is a power generator 52, the other variable speed unit is a motor 53, a scheme of 'one pipe and two motors' is selected, and the power generator 52 and the motor 53 are arranged in parallel. The scheme does not need to design and purchase a reversible unit independently, so that the cost is saved; meanwhile, the dynamic response capability of the pumped storage power station in cooperation with photovoltaic can be improved by the aid of the two-machine scheme. In terms of electrical connection, the stators of the two units can share one three-phase unit transformer to be connected with a power grid.
The combination of the micro-pumping power station and the photovoltaic power station aims to ensure that the overall output of the power generation system is not influenced by environmental and climate factors. Aiming at the unit selection of the micro-pumping power station, in order to enable the pumped storage unit to operate efficiently under the condition of higher water head amplitude and improve the dynamic response of the pumped storage power station in the process of providing auxiliary service for photovoltaic, the micro-pumping adopts a variable speed unit. The advantages of variable speed units over fixed speed units are very important for micro grids with unstable photovoltaic power supplies.
The pumped storage variable-speed generator set adopts a double-fed asynchronous generator, a rotor wiring terminal of the double-fed generator set is connected to a group of back-to-back converters, the converters are controlled by adopting a power semiconductor technology, a stator of the double-fed generator set is connected with a power grid through a set transformer, power decoupling control of power generation working conditions is designed, and accurate regulation and control of active power and reactive power are realized; similarly, the variable-speed pumped storage motor set adopts an adjustable-speed asynchronous motor, and a variable-speed driving unit is designed to adopt a direct torque control technology aiming at the working condition of a water pump, so that the mechanical torque of the motor is directly controlled. The design scheme is more suitable for the combined operation of the photovoltaic power station, firstly, the variable-speed unit can effectively solve the hidden danger of the safe operation of the system, such as the reactive power excess caused by the sudden change of the load, and the like, and meet the requirement of the micro-grid on quickly and accurately adjusting the frequency; secondly, the working range of the water turbine and the water pump can be effectively extended after the adjustable-speed generating motor set is used, the optimal efficiency area is enlarged, the water flow condition deviating from the high efficiency area can be improved, and the hydraulic mechanical vibration is reduced.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a mountain area water supply power supply system based on miniature pumped storage of photovoltaic which characterized in that: the system comprises an upper reservoir, a lower reservoir, a mountain photovoltaic matrix and a water surface floating type photovoltaic matrix, wherein the upper reservoir adopts a water storage tank of a mountain area water lifting irrigation system, the lower reservoir adopts a mountain area natural river or a water pool, the mountain area photovoltaic matrix is built in an empty land or a wasteland of the mountain area, and the water surface floating type photovoltaic matrix is built in the mountain area reservoir; one end of the upper reservoir is connected with the lower reservoir through a water conveying pipeline, and the other end of the upper reservoir is connected with a water using system in a mountainous area; and a pumped storage power generation motor set is arranged between the upper reservoir and the lower reservoir, and the pumped storage power generation motor set, the mountain photovoltaic square matrix and the water surface floating type photovoltaic square matrix are connected into a power grid through power transmission lines.
2. The mountain area water supply and power supply system based on photovoltaic miniature pumped storage of claim 1, characterized in that: the pumped storage power generation motor unit is arranged in a power generation plant under the mountain.
3. The mountain area water supply and power supply system based on photovoltaic miniature pumped storage of claim 1, characterized in that: the pumped storage power generation motor unit comprises two variable speed units which are connected in parallel, wherein one variable speed unit is a generator, and the other variable speed unit is a motor.
4. The mountain area water supply and power supply system based on photovoltaic miniature pumped storage of claim 3, characterized in that: the generator and the motor both adopt a double-fed asynchronous generator.
5. The mountain area water and power supply system based on photovoltaic miniature pumped storage according to claim 3 or 4, characterized in that: the rotor terminal of the generator is connected to one group of back-to-back converters, and the rotor terminal of the motor is connected to the other group of back-to-back converters; and the stator wiring terminals of the generator and the motor share one unit transformer to be connected with a power grid.
6. The mountain area water supply and power supply system based on photovoltaic miniature pumped storage of claim 5, characterized in that: when photovoltaic is exerted oneself and is surplus, mountain region photovoltaic square matrix and the surface of water float formula photovoltaic square matrix provide mountain area power consumption load, and simultaneously, mountain region photovoltaic square matrix and the surface of water float the surplus of formula photovoltaic square matrix and exert oneself and provide the electric energy and be used for driving motor, lift water to the mountain in the water storage tank.
7. The mountain area water supply and power supply system based on photovoltaic miniature pumped storage of claim 6, characterized in that: when the photovoltaic output is insufficient, the water storage tank on the mountain drains water, and the generator generates electricity to compensate the power supply of the mountain area.
CN202111252432.8A 2021-10-26 2021-10-26 Mountain area water supply and power supply system based on photovoltaic miniature pumped storage Pending CN113890100A (en)

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CN202111252432.8A CN113890100A (en) 2021-10-26 2021-10-26 Mountain area water supply and power supply system based on photovoltaic miniature pumped storage

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CN202111252432.8A CN113890100A (en) 2021-10-26 2021-10-26 Mountain area water supply and power supply system based on photovoltaic miniature pumped storage

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114678897A (en) * 2022-05-11 2022-06-28 阿坝水电开发有限公司 Coordination control method for hybrid hydropower and photovoltaic
CN116289816A (en) * 2023-02-22 2023-06-23 西北农林科技大学 Wind-solar-water storage multifunctional complementary water supply power generation system applicable to cold region channels

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114678897A (en) * 2022-05-11 2022-06-28 阿坝水电开发有限公司 Coordination control method for hybrid hydropower and photovoltaic
CN114678897B (en) * 2022-05-11 2022-10-14 阿坝水电开发有限公司 Coordination control method for hybrid hydropower and photovoltaic
CN116289816A (en) * 2023-02-22 2023-06-23 西北农林科技大学 Wind-solar-water storage multifunctional complementary water supply power generation system applicable to cold region channels

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