CN112160861A - Energy storage power generation system - Google Patents
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- CN112160861A CN112160861A CN202010876932.8A CN202010876932A CN112160861A CN 112160861 A CN112160861 A CN 112160861A CN 202010876932 A CN202010876932 A CN 202010876932A CN 112160861 A CN112160861 A CN 112160861A
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- 238000010248 power generation Methods 0.000 title claims abstract description 101
- 238000004146 energy storage Methods 0.000 title claims abstract description 35
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
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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
- H02J15/00—Systems for storing electric energy
- H02J15/003—Systems for storing electric energy in the form of hydraulic energy
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/70—Application in combination with
- F05B2220/706—Application in combination with an electrical generator
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- 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
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- 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
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- 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)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention relates to an energy storage power generation system. The energy storage power generation system comprises an upper water storage area and a lower water storage area with a height difference; the water channel system is used for connecting the upper water storage area and the lower water storage area; the water pumping and power generating device is used for pumping water from the lower water storage area to the upper water storage area and generating power when water flows from the upper water storage area to the lower water storage area; the solar power generation device is used for generating power by utilizing solar energy. The characteristics of flexible operation and good regulation performance of the water pumping power generation device are utilized to make up the defects of randomness and intermittence of solar power generation, the solar power generation is compensated, the grid connection requirement is met, the utilization rate and the grid connection rate of the solar power generation are improved, the grid connection power generation of new energy is promoted, the fossil energy power generation proportion is reduced to a certain extent, and the environment protection is facilitated.
Description
Technical Field
The invention relates to the field of energy utilization, in particular to an energy storage power generation system.
Background
China has abundant coal resources and numerous mines, but after a large amount of mining for decades, part of coal mine resources are exhausted. In addition to the rapid development of new energy technology and the implementation of the capacity policy of our country in recent years, more and more coal mine factories have or face the transformation and shutdown. Although the coal mine plant is transformed and closed, the roadway and the goaf left after coal mining are huge space resources. These space resources, if not utilized, are a significant waste.
On the other hand, in the field of new energy power generation, the problem of unstable electric energy output is faced. Particularly, in the field of solar power generation, the solar power generation system is easily influenced by cloudy weather and has the defects of randomness and intermittence.
According to the traditional technical scheme, a huge space left after coal mining is reformed into a reservoir, and a pumped storage system is constructed on the basis and used for storing the generated energy of the solar power generation system into potential energy of water and obtaining stable electric energy which can be directly merged into a power grid through hydraulic power generation. However, in this process, the energy is converted many times, and there is a problem that the energy loss is excessive.
Disclosure of Invention
In view of the above, it is necessary to provide an energy storage power generation system that improves the utilization rate of solar power generation.
An energy storage and generation system comprising:
an upper water storage area and a lower water storage area with a height difference;
the water channel system is used for connecting the upper water storage area and the lower water storage area;
the water pumping and power generating device is used for pumping water from the lower water storage area to the upper water storage area and generating power when water flows from the upper water storage area to the lower water storage area;
the solar power generation device is used for generating power by utilizing solar energy.
In the energy storage power generation system, basic conditions of hydroelectric power generation are established by designing the upper water storage area and the lower water storage area with height difference. On the basis, the upper water storage area, the lower water storage area, the water channel system and the water pumping and power generating device form a hydroelectric power generating system together. When the solar power generation is unstable, the characteristics of flexible operation and good regulation performance of the water pumping power generation device are utilized to make up the defects of randomness and intermittence of the solar power generation, the solar power generation is compensated to meet the grid-connected requirement, the grid-connected rate and the utilization rate of the solar power generation are improved, the grid-connected power generation of new energy is promoted, and the environment is protected.
In one embodiment, the water pumping power generation device and the solar power generation device are both connected with a power grid, and the water pumping power generation device and the solar power generation device are electrically connected. The water pumping and power generating device is connected with a power grid, so that power compensation can be performed on the power grid in the peak period of power utilization, and the pressure of the power grid is relieved. The solar power generation device is connected with a power grid, and can utilize electric energy generated by solar energy to supply power to the power grid, so that the power generation proportion of renewable energy sources is increased. The water pumping power generation device is electrically connected with the solar power generation device, so that when the solar power generation amount is larger than the power consumption amount, redundant electric energy is used for pumping water for energy storage, and a part of electric energy generated by solar energy is converted into potential energy of water for storage. When the solar power generation is unstable, the water pumping power generation device is used for generating power, and the solar power generation is compensated, so that the grid connection requirement can still be met.
In one embodiment, the water pumping and power generating device delivers electric energy to the power grid or utilizes the electric energy in the power grid for pumping water and storing energy. During the peak period of power utilization, the water pumping and power generating device transmits electric energy to the power grid to relieve the pressure of the power grid; during the electricity consumption valley period, the power grid uses the redundant electric energy for pumping water and storing energy, and converts the redundant electric energy into potential energy of water for storage, and finally the effect of peak clipping and valley filling is achieved.
In one embodiment, the upper water storage area comprises a river, a lake or a reservoir modified by a mineral subsidence area on the ground, and the lower water storage area comprises a reservoir modified by a waste mine or an underground mineral goaf. If the surface has rivers or lakes, the water storage area can be directly used as the upper water storage area, and a reservoir does not need to be built for storing water, so that the engineering quantity is reduced. If no river or lake exists on the ground surface, the reservoir formed by reforming the mineral product subsidence area can be used as an upper water storage area, the earth digging operation is not needed, only slight trimming is needed on the basis of the subsidence area, and the reservoir is reformed into a reservoir, so that the engineering quantity is reduced, the construction speed is accelerated, and meanwhile, the cost is also reduced. The water storage area is built by utilizing the abandoned mine and the mineral goaf, the water storage power generation system is built, space resources are effectively utilized, the region limitation of the traditional hydroelectric power generation system is overcome, the water storage area with the height difference can be built in the place without the natural potential difference for hydroelectric power generation and energy storage, meanwhile, the water storage area is built by utilizing the abandoned mine and the mineral goaf, the engineering scale and investment can be reduced, the construction progress is accelerated
In one embodiment, the waterway system is retrofitted with existing roadways in the abandoned mine. By means of the original tunnel in the abandoned mine, a water channel system does not need to be built from zero, so that the engineering quantity can be effectively reduced, the construction speed is accelerated, and the cost is reduced.
In one embodiment, the water pumping and power generating device comprises a three-machine water pumping and power generating set, wherein the three-machine water pumping and power generating set comprises a water pump, a water turbine and a motor generator, and the motor generator is electrically connected with the water pump and the water turbine respectively. The water pumps of the three-machine type unit can be classified, can work under the condition of a higher water head, and has wider application range.
In one embodiment, the water pumping and power generating device comprises a two-machine water pumping and power generating set, the two-machine water pumping and power generating set comprises a pump water turbine and a motor generator, and the pump water turbine is electrically connected with the motor generator. The two-machine type unit has light weight, low cost and small occupied space.
In one embodiment, the solar power plant comprises a photovoltaic array and the photovoltaic array is disposed on land or on water. Thus, the proper and economic installation mode can be selected according to different conditions.
In one embodiment, the solar power generation device further comprises an energy storage device connected to the photovoltaic array for storing electrical energy. When the solar power generation is unstable, the unstable electric energy can be stored in the energy storage device firstly, converted into stable electric energy and then merged into the power grid. This may provide for the use of solar energy.
In one embodiment, the energy storage and power generation system comprises an equipment storage chamber, the equipment storage chamber is arranged in an abandoned mine or an underground goaf, and the motor generator is stored in the equipment storage chamber. The motor generator is isolated from the external environment, interference of the external environment is avoided, and the service life of the equipment is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an energy storage and generation system;
fig. 2 is a schematic structural diagram of an energy storage power generation system in another embodiment.
Fig. 3 is a schematic structural diagram of an energy storage power generation system in another embodiment.
Reference is made to the accompanying drawings in which: 110. a power grid; 120. a solar power generation device; 121. a photovoltaic array; 122. an energy storage device; 130. a water pumping and power generating device; 141. an upper water storage area; 142. a lower water storage area; 150. a waterway system.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In describing positional relationships, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another layer, it can be directly on the other layer or intervening layers may also be present. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening layers may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
As shown in fig. 1, an embodiment of the present application provides an energy storage and power generation system, including: an upper water storage area 141 and a lower water storage area 142 having a height difference; a waterway system 150 for connecting the upper water storage region 141 and the lower water storage region 142; a water pumping and power generating means 130 for pumping water from the lower water storage region 142 to the upper water storage region 141 and generating power when water flows from the upper water storage region 141 to the lower water storage region 142; the solar power generation device 120 generates power by using solar energy. In the present embodiment, the upper water storage area 141, the lower water storage area 142, the waterway system 150, and the pumped-hydro power generation device 130 together constitute a pumped-hydro energy storage system. The pumped storage system can convert electric energy into potential energy of water for storage, and can also supply electric energy to the outside through hydroelectric power generation. When the solar power generation is unstable, for example, when sunlight is weak or weather is cloudy and uncertain, the pumped storage system compensates the solar power generation by utilizing the characteristics of flexible operation and good adjustability of the pumped storage system, so that the power generated by the energy storage power generation system can still meet the grid connection requirement. The energy storage power generation system in the embodiment improves the grid-connected rate and the utilization rate of solar power generation through flexible compensation of solar power generation, promotes the application of renewable energy sources, and makes contribution to environmental protection.
In one example, as shown in fig. 2, the pumped hydro power generation device 130 and the solar power generation device 120 are both connected to the power grid 110, and the pumped hydro power generation device 130 and the solar power generation device 120 are electrically connected. In the daytime, if solar energy is sufficient, the power generation state of the solar power generation device 120 is good, the power generation is stable, the generated electric energy is merged into the power grid 110, the clean energy power generation proportion is increased, the traditional energy power generation amount is reduced, and the effect of protecting the environment is achieved. At the peak of electricity consumption in the evening, the sunlight intensity is weakened at this time, the solar power generation device 120 is insufficient to generate electricity, and at this time, the pumping power generation device 130 generates electricity by making the water in the upper water storage region 141 flow to the lower water storage region 142 through the water channel system 150, and utilizing the potential energy generated by the water descending from the high position. The solar power generation device 120 and the water pumping power generation device 130 work together to supply electric energy to the power grid 110, so that the pressure of the power grid 110 is relieved. After the peak period of electricity utilization, the water pumping and power generating device 130 pumps water from the lower water storage area 142 to the upper water storage area 141 by means of the surplus electric energy in the valley period of the power grid 110 to pump water and store energy, so as to prepare for the hydroelectric power generation in the next day.
If the solar power generation device 120 cannot ensure stable power supply in the daytime when the solar energy is insufficient, such as in cloudy days or rainy days, the water pumping power generation device 130 starts hydroelectric power generation, and supplies power to the power grid together with the solar power generation device 120. The method specifically comprises the following steps: the water in the upper water storage area 141 flows to the lower water storage area 142 through the water channel system 150, the potential energy generated by the falling of the water from the high position is utilized to generate electricity, and the corresponding electric energy is generated according to the fluctuation condition of the electric energy generated by the solar energy, so that the electric energy generated by the water pumping and electricity generating device 130 and the solar energy electricity generating device 120 together meets the grid connection requirement, and the grid connection rate of the solar energy electricity generation is improved. The scheme in the example plays a promoting role in grid-connected power generation of new energy, and is beneficial to reducing the proportion of fossil energy power generation and reducing environmental pollution.
In one example, during the day, the solar power generation device 120 generates more power than the current demand, and the surplus power is transmitted to the pumped-water power generation device 130 for pumped-water storage. The technical scheme in this example can make full use of the electric energy that energy storage power generation system produced, improves energy utilization and rates, avoids the energy extravagant.
In one example, during peak periods of power usage and when the solar power plant 120 is unable to supply power, the pumped-water power plant 130 may be utilized to generate power and deliver power to the grid 110, thereby relieving the grid 110 of stress. When the electricity consumption is in the valley period, the electric energy of the power grid 110 is used for pumping water and storing energy, so that the effect of peak clipping and valley filling is achieved, and the electric energy utilization rate of the power grid is improved.
In the energy storage power generation system in any embodiment, energy transmission and conversion are completed through the electrical connection among the power grid 110, the solar power generation device 120 and the water pumping power generation device 130, so that the grid connection rate of solar power generation is improved, the use of clean energy is promoted, peak clipping and valley filling can be performed on the power grid 110, and the utilization efficiency of electric energy is improved.
In one example, the upper storage area 141 includes a river, lake, or reservoir modified with a mineral subsidence area on the surface, and the lower storage area 142 includes a reservoir modified with a abandoned mine or an underground mineral gob. Because the lower water storage area 142 and the ground form a sufficient height difference (the vertical distance between the underground abandoned mine and the ground is generally more than 100 meters), the area higher than the ground does not need to be searched to construct a reservoir to construct the upper water storage area 141, and rivers or lakes on the ground can be directly utilized. If there are no suitable rivers and lakes, the surface subsidence area caused by mineral mining can be used, and it can be transformed into a reservoir as the upper water storage area 141 in this application. This method of constructing the upper and lower water storage areas 141 and 142 overcomes the regional limitation of building the conventional hydro-power generation system, so that the hydro-power generation system can be constructed to store and generate power also in places without natural potential difference.
In one example, the upper storage area 141 is a reservoir modified from a coal mine subsidence area, and the lower storage area 142 is a reservoir modified from an underground abandoned mine. The coal mining area often forms large-area ground subsidence area, can transform it into the reservoir on ground subsidence area's basis, as last water storage area 141 in this application. Underground abandoned mines often contain goafs with huge spaces, and the goafs can form underground reservoirs after being reinforced and modified without difficult and arduous excavation work underground. Generally, the storage capacity of the modified reservoir reaches about 100 ten thousand cubic meters, and if the capacity of the lower storage area 142 is more required, a plurality of underground goafs can be modified into underground reservoirs and connected by the water channel system 150. The reservoirs formed by reforming the coal mine subsidence area and the abandoned mine are used as the upper water storage area 141 and the lower water storage area 142, so that the space resources are effectively utilized, the engineering scale and investment are reduced, and the construction progress is accelerated.
In the energy storage power generation system in the above embodiment, the water storage capacity of the upper water storage area 141 is greater than or equal to the water storage capacity of the lower water storage area 142, so as to ensure that the upper water storage area 141 has enough space to accommodate when the water in the lower water storage area 142 is completely pumped to the upper water storage area 141.
In one example, the waterway system 150 is retrofitted with existing roadways in abandoned mines. The transformation process can adopt a vertical drilling technology, the technology can work under the conditions of large vertical distance and pressure difference, and the penetration precision is high. Specifically, the water delivery channel between the upper water storage area 141 and the lower water storage area 142 can be constructed by using a vertical drilling technology on the basis of the original roadway, so that the purposes of reducing the engineering quantity, accelerating the construction speed and reducing the cost are achieved.
In one example, pumped-hydro power generation device 130 includes a three-machine pumped-hydro generator set including a water pump, a water turbine, and a motor generator electrically connected to the water pump and the water turbine, respectively. When the pumping and power generating device 130 needs to generate power, the water turbine rotates under the potential energy of water to drive the motor generator to rotate, and the motor generator works in a generator mode at the moment. When the water pumping and generating device 130 needs to pump water, the external power supply supplies electric energy to the water pump through the motor generator, and the water in the lower water storage area 142 is pumped to the upper water storage area 141, so that the potential energy conversion from the electric energy to the water is realized, and the motor generator works in a motor mode at this time. The water pump of the three-machine type water pumping generator set can be classified, water pumping operation can be performed under the condition of a higher water head, and the three-machine type water pumping generator set is wide in application range.
In one example, the pumped hydro power generation device 130 includes a two-machine pumped hydro generator set including a pump turbine and a motor generator, the pump turbine being electrically connected to the motor generator. The pump turbine has the functions of both the water pump and the water turbine. When the pumping and power generating device 130 needs to generate power, the pump turbine operates in the turbine mode, the turbine drives the motor generator to operate under the action of water potential energy to generate electric energy, and at the moment, the motor generator operates in the generator mode. When the water pumping and generating device 130 needs to pump water, the pump turbine operates in the pump mode, the external power supply supplies electric energy to the pump turbine through the motor generator, the water in the lower water storage area 142 is pumped to the upper water storage area 141, the potential energy conversion from the electric energy to the water is realized, and the motor generator operates in the motor mode at this time. The two-machine type water pumping generator set has the advantages of light weight, low cost and small occupied space.
In one example, pumped-hydro power generation device 130 includes a four-machine pumped-hydro generator set that includes an electric motor, an electric generator, a water pump, and a water turbine. The motor is connected with the water pump and used for providing electric energy for the water pump to pump water from the lower water storage area to the upper water storage area, and the conversion of potential energy from the electric energy to the water is completed. The generator is connected with the water turbine, and when water flows from the upper water storage area to the lower water storage area, the water turbine rotates to drive the generator to work to generate electricity, so that the potential energy of the water is converted into electric energy. The four-machine type water pumping generator set has high operation efficiency, does not interfere with each other, occupies larger space and has high cost, and is not adopted at present
In one example, as shown in fig. 3, in one embodiment of the present application, the solar power plant 120 includes a photovoltaic array 121. The solar energy has low energy density, and the conversion efficiency of the solar panel in the photovoltaic array 121 to the light energy is not high at the present stage, so that in order to obtain the electric energy which can meet the grid connection requirement, the photovoltaic panel needs to be combined in a series and parallel mode, the series connection aims at improving the voltage, the parallel connection aims at increasing the current, and the voltage and the current which meet the requirement are obtained. Generally, the photovoltaic panels connected in series and in parallel occupy a large area, so that in an area with large economic cost of land resources, a method of laying the photovoltaic array 121 on the water surface can be adopted. In areas where land resources are abundant and economic costs are not high (e.g., the northwest inland), photovoltaic arrays 121 may be laid on land.
In the energy storage and power generation system in the above embodiment, please refer to fig. 3, the solar power generation device 120 further includes an energy storage device 122, and the energy storage device 122 is connected to the photovoltaic array 121 and is used for storing the electric energy generated by the photovoltaic array 121. Meanwhile, the energy storage device 122 is also connected to the grid 110 for supplying stable electric energy to the grid 110. Because the electric energy generated by the photovoltaic array 121 is unstable in a weather condition (such as cloudy day or rainy day) where the solar energy is insufficient, and cannot be directly incorporated into the power grid 110, the electric energy needs to be stored in the energy storage device 122 to be stable and then be transmitted to the power grid 110. Illustratively, the energy storage device 122 includes: lithium-electron battery systems, sodium-sulfur battery systems, and the like.
In one example, the energy storage and power generation system includes an equipment storage chamber disposed in an abandoned mine or underground gob for storing some equipment that needs protection and isolation, such as a motor generator and some control equipment. The space resources of the abandoned mine or the underground mined-out area are sufficient, and the equipment storage chamber can be completely built while the reservoir is built. The equipment storage chamber isolates the equipment to be protected from the external environment, so that the equipment is not interfered by the external environment, and the functions of protecting the equipment and prolonging the service life of the equipment are achieved. Meanwhile, the motor generator is often accompanied by a great noise when operating, and noise pollution can be prevented by constructing the equipment storage chamber underground.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An energy storage and generation system, comprising:
an upper water storage area and a lower water storage area with a height difference;
the water channel system is used for connecting the upper water storage area and the lower water storage area;
the water pumping and power generating device is used for pumping water from the lower water storage area to the upper water storage area and generating power when water flows from the upper water storage area to the lower water storage area;
the solar power generation device is used for generating power by utilizing solar energy.
2. The energy-storing and power-generating system of claim 1, wherein the water-pumping and power-generating device and the solar-energy power-generating device are both connected to a power grid, and wherein the water-pumping and power-generating device and the solar-energy power-generating device are electrically connected.
3. The energy-storing and power-generating system of claim 2, wherein the water pumping and power-generating device delivers power to the power grid and uses the power in the power grid for pumping and storing water.
4. The energy-storing and power-generating system of claim 1, wherein the upper water storage area comprises a river, lake or reservoir modified from a mineral subsidence area on the surface of the earth, and the lower water storage area comprises a reservoir modified from a abandoned mine or an underground mineral goaf.
5. The energy-storing and power-generating system of claim 1, wherein the waterway system is retrofitted with existing roadways in abandoned mines.
6. The energy-storing and power-generating system of claim 1, wherein the pumped-hydro power generation device comprises a three-machine pumped-hydro power generation unit comprising a water pump, a water turbine, and a motor generator electrically connected to the water pump and the water turbine, respectively.
7. The energy-storing and power-generating system of claim 1, wherein the water-pumping and power-generating device comprises a two-machine water-pumping and power-generating set, the two-machine water-pumping and power-generating set comprises a pump turbine and a motor generator, and the pump turbine is electrically connected with the motor generator.
8. The energy-storing and power-generating system of claim 1, wherein the solar power plant comprises a photovoltaic array disposed on land or on water.
9. The energy storage and power generation system of claim 8, wherein the solar power generation device further comprises an energy storage device coupled to the photovoltaic array for storing electrical energy.
10. The energy-storage power generation system according to claim 6 or 7, comprising an equipment storage chamber provided in an abandoned mine or an underground goaf, wherein the motor generator is stored in the equipment storage chamber.
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