CN110783961B - Overwater photovoltaic system capable of reducing impact of grid connection on power grid - Google Patents

Overwater photovoltaic system capable of reducing impact of grid connection on power grid Download PDF

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Publication number
CN110783961B
CN110783961B CN201911242593.1A CN201911242593A CN110783961B CN 110783961 B CN110783961 B CN 110783961B CN 201911242593 A CN201911242593 A CN 201911242593A CN 110783961 B CN110783961 B CN 110783961B
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water
heat exchange
storage device
air
heat
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CN110783961A (en
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孙锲
黄清喜
刘璐瑶
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Shandong University
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Shandong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • 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
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention relates to the technical field of overwater photovoltaic, in particular to an overwater photovoltaic system capable of reducing impact of grid connection on a power grid, which comprises an air compressor, a heat exchange box, a gas storage device, a photovoltaic panel, an expansion machine, a generator, a water supply system and an external heat supply system, wherein the air compressor is connected with the heat exchange box; the air storage device is provided with a cavity, an air compressor is connected with an air inlet of the heat exchange box, an air outlet of the heat exchange box, the air storage device and an expander are sequentially connected, the expander is connected with the generator, a first valve is arranged on a connecting pipeline between the air compressor and the heat exchange box, and a second valve is arranged on a connecting pipeline between the air storage device and the expander; the photovoltaic panel is arranged above the gas storage device; the water supply system is connected with the water inlet of the heat exchange box, and the external heat supply system is connected with the water outlet of the heat exchange box. The device utilizes the space below the photovoltaic panel to install the gas storage device and uses the gas storage device as a support element of the photovoltaic on water, thereby achieving the full utilization of the photovoltaic system on water and establishing a power generation and energy storage integrated technology and improving the grid-connected capacity of the photovoltaic.

Description

Overwater photovoltaic system capable of reducing impact of grid connection on power grid
Technical Field
The invention relates to the technical field of overwater photovoltaic, in particular to an overwater photovoltaic system capable of reducing impact of grid connection on a power grid.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
With the acceleration of the industrialized process and the rapid increase of economy in China, the demand of China for energy sources is continuously increased. However, the energy subject of China is mainly coal, which leads to the continuous deterioration of environmental problems, so that clean energy mainly comprising solar energy, wind energy and the like is rapidly developed in recent years, wherein the advantages of saving land resources, effectively reducing water evaporation and the like of the overwater photovoltaic technology are rapidly developed in recent years. However, photovoltaic power generation has the characteristic of intermittence, so that loss is caused to the quality of electric energy when the photovoltaic power generation is connected to the grid, and impact is easily caused to the safe operation of a power grid, so that the accepting capacity of the power grid to the photovoltaic power generation needs to be improved.
The main energy storage modes at present comprise pumped storage, compressed air storage, battery storage, super capacitor and other energy storage modes. However, due to the problems of capacity, energy storage period, cost and the like, the existing commercial energy storage system operated on a large scale only has two types of pumped storage and compressed air energy storage. Pumped storage has the advantages of mature technology, large energy storage capacity, long period and the like, but pumped storage requires special terrains to establish dams and reservoirs, and the construction period of pumped storage can also cause ecological problems, so compressed air energy storage is paid more and more attention. The traditional air energy storage mode is that when electricity is used in a low valley, an electric drive air compressor is used for compressing air to an underground cave or other high-pressure air storage devices, and when the electricity is used in a high peak, the compressed air is heated and then is sent to a combustion chamber to be combusted, and then a turbine is driven to generate electricity. The conventional compressed air energy storage method has a main power source of conventional energy sources, which causes certain carbon pollution, and the conventional compressed air energy storage method also requires specific air storage places, such as underground caves or dead wells, and the popularization of the air energy storage is limited due to these reasons. In the compressed air energy storage process, the temperature of the compressed air can be increased, but the compressed air with high temperature and high pressure is directly stored, so that the efficiency of air energy storage can be reduced. In addition, in remote areas, the hot water supply of residents has been a major problem; the traditional method for heating water supply is generally heating by a heat exchanger, however, the heat exchanger needs an external fan to induce air to exchange heat, but the mode causes low total heat exchange efficiency.
Disclosure of Invention
Aiming at the existing problems, the invention provides the water photovoltaic system capable of reducing the impact of grid connection on a power grid. In order to achieve the purpose, the invention adopts the following technical means:
an overwater photovoltaic system capable of reducing impact on a grid due to grid connection comprises: the system comprises an air compressor, a heat exchange box, a gas storage device, a photovoltaic panel, an expander, a generator, a water supply system and an external heat supply system; wherein: the air storage device is of a cavity structure, the air compressor is connected with an air inlet of the heat exchange box, an air outlet of the heat exchange box, the air storage device and the expander are sequentially connected, the expander is connected with the generator, a first valve is arranged on a connecting pipeline between the air compressor and the heat exchange box, and a second valve is arranged on a connecting pipeline between the air storage device and the expander; the photovoltaic panel is arranged above the gas storage device; the water supply system is connected with the water inlet of the heat exchange box, and the external heat supply system is connected with the water outlet of the heat exchange box.
Furthermore, the above-water photovoltaic system capable of reducing impact of grid connection on a power grid at least comprises a plurality of groups of heat supply and energy storage units which are formed by the heat exchange box and the gas storage device together, and the heat supply and energy storage units are sequentially connected in series, namely, a gas outlet of the heat exchange box, a gas inlet of the gas storage device, a gas outlet of the gas storage device and a gas outlet of the heat exchange box are sequentially communicated; and a photovoltaic panel is arranged above the gas storage device of each group of heat supply and energy storage units.
Furthermore, at least two heat exchangers are arranged in the heat exchange box, an air outlet of the air compressor is divided into at least two branches and then is respectively connected with the heat exchangers in the heat exchange box in a one-to-one correspondence mode, the heat exchangers in adjacent heat exchange boxes are connected in series, after an outlet of each heat exchanger in the heat exchange box adjacent to the expansion machine is connected with the header pipe, the header pipe is connected with the expansion machine, and the second valve is arranged on the header pipe.
Further, the outlet of each heat exchanger in the heat exchange box adjacent to the expander is provided with a valve so as to control each heat exchanger independently.
Furthermore, all be provided with the valve on the branch road to in control each branch road alone, when some branch roads broke down, other branch roads were reserve in the setting of branch road, guaranteed the continuous normal operating of whole device.
Further, the water supply system comprises a water pump and a water supply pipe, and the water pump is connected with the water inlet of the heat exchange box through the water supply pipe.
Further, outside heating system includes heat storage water tank and user, heat storage water tank passes through the pipeline and is connected with the delivery port of heat transfer case, the user is connected with heat storage water tank, and is provided with the valve on the connecting line between user and the heat storage water tank.
Furthermore, the photovoltaic panel is arranged above the gas storage device through a support, one end of the support is fixed on the gas storage device, the other end of the support is fixed with a groove above the gas storage device, and the photovoltaic panel is arranged in the groove.
Further, one end of the support is fixedly arranged on an air inlet pipe and/or an air outlet pipe of the air storage device, and preferably, the support is fixedly connected with the air inlet pipe and/or the air outlet pipe through a sleeve.
Furthermore, the air inlet pipe, the air outlet pipe and the air storage device are hermetically connected through flanges and gaskets.
Furthermore, the heat exchanger is a V-shaped heat exchanger, a water inlet of the heat exchanger is connected with a water supply pipe, and a water outlet of the V-shaped heat exchanger is connected with an external heat supply system.
Compared with the prior art, the precision surgical instrument protection device has the following beneficial effects:
(1) the air storage device is arranged in the lower space of the photovoltaic panel and serves as a supporting element of the photovoltaic on water, so that the dual functions of air storage and photovoltaic supporting are realized, the full utilization of the photovoltaic system on water is achieved, the power generation and energy storage integrated technology is established, and the grid-connected capacity of the photovoltaic is improved.
(2) The invention utilizes high-temperature and high-pressure air to heat the feed water while storing energy in the compressed air, cools the compressed air, and utilizes the high-pressure air to replace a draught fan in the traditional heat exchanger, thereby improving the overall efficiency of the system.
(3) In order to reduce the temperature of the stored air and improve the energy storage efficiency, the heat exchanger unit is added in the compressed air energy storage system to heat the water supply of residents, so that the temperature of the stored air is reduced, and the energy utilization efficiency of the whole photovoltaic system is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an overwater photovoltaic system capable of reducing impact of grid connection on a power grid in the embodiment of the invention.
FIG. 2 is a schematic diagram of a gas storage device according to an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a gas storage device, a gas inlet pipe and a gas outlet pipe according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a heat exchange box in an embodiment of the invention.
The designations in the above figures represent respectively: the system comprises an air compressor, a heat exchange box 2, a heat storage device 3, a gas storage device 4, a photovoltaic panel 5, an expansion machine 6, a power generator 7, a water supply system 8, an external heat supply system 9, a first valve 10, a second valve 11, a main pipe 12, a water pump 12, a water supply pipe 13, a hot water storage tank 14, a user 15, a support 16, an air inlet pipe 17, an air outlet pipe 18, a sleeve 19, a groove 20, a flange 21, a gasket 22, a heat exchanger 23-V, a water inlet 24 and a water outlet 25.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described above, the existing photovoltaic power generation has the characteristic of intermittence, so that the quality of electric energy is lost when the photovoltaic power generation is connected to a grid, and the impact is easily caused on the safe operation of a power grid, so that the acceptance capacity of the power grid for the photovoltaic power generation needs to be improved by an energy storage system. Therefore, the invention provides the overwater photovoltaic system which can reduce the impact of grid connection on a power grid; the invention will now be further described with reference to the drawings and detailed description.
First embodimentReferring to fig. 1, an example of an above-water photovoltaic system designed according to the present invention and capable of reducing grid-connection impact on a power grid includes: the system comprises an air compressor 1, a heat exchange box 2, a gas storage device 3, a photovoltaic panel 4, an expander 5, a generator 6, a water supply system 7 and an external heat supply system 8; wherein: the air storage device 3 is of a cavity structure, the air compressor 1 is connected with an air inlet of the heat exchange box 2, an air outlet of the heat exchange box 2, the air storage device 3 and the expander 5 are sequentially connected, the expander 5 is connected with the generator 6, a first valve 9 is arranged on a connecting pipeline between the air compressor 1 and the heat exchange box 2, and a second valve 10 is arranged on a connecting pipeline between the air storage device 3 and the expander 5; the photovoltaic panel 4 is arranged above the gas storage device 3; the water supply system 7 and the heat exchange box2, and the external heating system 8 is connected with the water outlet of the heat exchange box 2.
The existing photovoltaic power generation has the problem that a large amount of space is left between a photovoltaic panel and a supporting element of the photovoltaic panel and is not utilized except that the existing photovoltaic power generation easily causes impact on the safe operation of a power grid, and the existing overwater photovoltaic supporting element generally takes a hollow plastic container as a main part, so that the problem that the space below the photovoltaic panel and the supporting element are not fully utilized is caused. In the embodiment, the air storage container is installed in the lower space of the photovoltaic panel and serves as a supporting element of the photovoltaic on water, so that the photovoltaic system on water is fully utilized, a power generation and energy storage integrated technology is established, and the grid-connected capacity of the photovoltaic is improved. Meanwhile, when the compressed air stores energy, the high-temperature and high-pressure air is used for heating the feed water to cool the compressed air, the compressed air can store the electric energy of photovoltaic power generation, the compressed air drives the motor to generate power to supplement the photovoltaic output electric quantity when the photovoltaic power generation is insufficient, the impact of grid connection of the photovoltaic power generation on the safe operation of a power grid is effectively overcome, and the receiving capacity of the power grid on the photovoltaic power generation is improved.
It is understood that on the basis of the first embodiment, the following technical solutions including but not limited to the following may be derived to solve different technical problems and achieve different purposes of the invention, and specific examples are as follows:
second embodimentReferring to fig. 1, the above-water photovoltaic system capable of reducing impact of grid connection on a power grid at least comprises a plurality of groups of heat supply and energy storage units formed by the heat exchange box 2 and the gas storage device 3, and the heat supply and energy storage units are sequentially connected in series, that is, the gas outlet of the heat exchange box 2, the gas inlet of the gas storage device 3, the gas outlet of the gas storage device 3 and the gas outlet of the heat exchange box 2 are sequentially communicated; and a photovoltaic panel 4 is arranged above the gas storage device 3 of each group of heat supply and energy storage units. The utilization rate of heat energy in the compressed air can be improved by arranging the plurality of groups of heat supply energy storage units which are connected in series, electric energy is timely converted into heat energy and is timely conveyed to an external heat supply system when photovoltaic power generation is abundant, the stability of photovoltaic power generation is effectively guaranteed, the impact on a power grid is reduced, and hot water can be provided for users.
Third embodimentWith continued reference to fig. 1 and the second embodiment, the outlets of the heat exchangers in the heat exchange box 2, which are conveyed adjacent to the expander 5, are provided with valves to facilitate individual control of the heat exchangers according to the demand for heat supply and the like.
Fourth embodimentWith continued reference to FIGS. 1 andsecond embodimentAll be provided with the valve on the branch road to in each branch road carry out the independent control, when the setting of branch road can prevent that some branch roads from breaking down, other branch roads are reserve, guarantee the continuous normal operating of whole device.
Fifth embodimentWith continued reference to fig. 1, the water supply system 7 includes a water pump 12 and a water supply pipe 13, and the water pump 12 is connected to the water inlet of the heat exchange tank 2 through the water supply pipe 13. The low-temperature water is continuously supplied to the heat exchange tank through the water pump and the water supply pipe so as to carry the heat energy in the compressed air to an external heating system in time.
Sixth embodimentContinuing to refer to fig. 1, external heating system 8 includes heat storage water tank 14 and user 15, heat storage water tank 14 passes through the pipeline and is connected with the delivery port of heat transfer case 2, user 15 is connected with heat storage water tank 14, and is provided with the valve on the connecting line between user 15 and the heat storage water tank 14. This embodiment is through carrying out energy storage and heat exchanger heating resident feedwater at compressed air, has reduced the temperature of stored air, improves whole photovoltaic system's energy utilization efficiency.
Seventh embodimentReferring to fig. 2, the photovoltaic panel 4 is disposed above the gas storage device 3 through a bracket 16, one end of the bracket 16 is fixed to a gas inlet pipe 17 and a gas outlet pipe 18 of the gas storage device 3, and the bracket 16 is fixedly connected to the gas inlet pipe and/or the gas outlet pipe through a sleeve 19. The other end of the bracket 16 is fixed with a groove 20 above the gas storage device 3, and the photovoltaic panel 4 is installed in the groove 20.
Eighth embodimentReferring to fig. 3 and the seventh embodiment, the air inlet pipe 17, the air outlet pipe 18 and the air storage device 3 are hermetically connected through a flange 21 and a gasket 22, so that leakage of compressed air and waste of energy are avoided.
Ninth embodimentReferring to fig. 1 and 4, two V-shaped heat exchangers 23 are disposed in the heat exchange box 2, an air outlet of the air compressor 1 is divided into two branches and then is connected with each heat exchanger in the heat exchange box 2 in a one-to-one correspondence manner, the heat exchangers in adjacent heat exchange boxes 2 are connected in series, and after an outlet of each heat exchanger in the heat exchange box 2 adjacent to the expander 5 is connected with the header pipe 11, the header pipe is connected with the expander 5, and the second valve 10 is disposed on the header pipe 11. The water inlet 24 of the heat exchanger is connected with the water supply pipe 13, and the water outlet 25 of the heat exchanger is connected with the external heating system 8.
The working principle of the above-water photovoltaic system capable of reducing grid connection impact on a power grid is as follows:
(1) energy storage process: when the photovoltaic power generation amount on water is higher than the demand, the compressed air energy storage system is used for consuming redundant power generation amount. Namely: opening a first valve 9 and installing a flow 2 on an air pipeline branch, driving an air compressor 1 to press air into a heat exchange box 2 through electric energy of photovoltaic power generation, and ensuring that the air flow in each branch is the same when a plurality of branches exist; the compressed high-temperature and high-pressure air enters the heat exchange box 2 to heat the feed water; the high-pressure air after passing through the heat exchange box enters the air storage device 3, continues to sequentially pass through the subsequent heat exchange box and the air storage device which are connected in series, compressed air is stopped to be continuously transmitted under the constraint of the closed second valve 10, the air compression process is finished, then the first valve 9 and the air compressor 1 are sequentially closed, the high-pressure air is stored in a pipeline and a space between the first valve 9 and the second valve 10, meanwhile, part of electric energy of photovoltaic power generation is converted and stored in the gas of the photovoltaic power generation, and the rest of electric energy is converted into the energy which can still be used for heating water.
(2) The power generation process comprises the following steps: when photovoltaic power generation capacity on water is lower than the demand, compressed air is required to be utilized for power generation to meet the power supply. After the second valve 10 is opened, the compressed high-pressure air enters the expander 5 to perform expansion work, then the generator 6 is driven to generate electricity to supplement the photovoltaic output electric quantity, the impact of photovoltaic power generation grid connection on the safe operation of a power grid is effectively overcome, and the receiving capacity of the power grid on the photovoltaic power generation is improved; and simultaneously, the power utilization requirement is met. After the power generation is finished, the second valve 10 is closed to wait for the next energy storage process.
(3) Heating and water supply: in the energy storage process, a water pump 12 is started to press feed water into a heat exchange box, a water inlet pipe is installed at the bottom of the heat exchange box 2, and the feed water is output through a water outlet pipe at the top of the heat exchange box after exchanging heat with high-temperature compressed air in a V-shaped heat exchanger; the heated feed water enters the heat storage water tank 14; a valve is installed between the hot water storage tank and the user 15 so that the valve is opened to supply hot water when the user needs the hot water.
(4) Reduce the impact of photovoltaic to the electric wire netting: in the non-control electric power market, each unit of the power generation side is in a bidding internet mode, and the real-time electric quantity and the bidding electric quantity are equal. When the photovoltaic power generation is larger than the bidding electric quantity, redundant electric power drives the air compressor 1 to press air into the air storage device 3, so that the purpose of power consumption is achieved; when the photovoltaic power generation is lower than the bidding electric quantity, the compressed high-pressure air drives the generator 6 to generate power after passing through the expansion machine 5, so that the photovoltaic power grid-surfing electric quantity is equal to the bidding electric quantity in real time, and the impact on a large power grid is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. The utility model provides a can reduce photovoltaic system on water that is incorporated into power networks assaulted to electric wire netting which characterized in that includes: the system comprises an air compressor, a heat exchange box, a gas storage device, a photovoltaic panel, an expander, a generator, a water supply system and an external heat supply system; wherein: the air storage device is of a cavity structure, the air compressor is connected with an air inlet of the heat exchange box, an air outlet of the heat exchange box, the air storage device and the expander are sequentially connected, the expander is connected with the generator, a first valve is arranged on a connecting pipeline between the air compressor and the heat exchange box, and a second valve is arranged on a connecting pipeline between the air storage device and the expander; the photovoltaic panel is arranged above the gas storage device; the water supply system is connected with a water inlet of the heat exchange box, and the external heat supply system is connected with a water outlet of the heat exchange box;
the above-water photovoltaic system capable of reducing impact of grid connection on a power grid at least comprises two groups of heat supply energy storage units formed by the heat exchange box and the gas storage device, and the heat supply energy storage units are sequentially connected in series, namely the gas outlet of the heat exchange box, the gas inlet of the gas storage device, the gas outlet of the gas storage device and the gas outlet of the heat exchange box are sequentially communicated; and a photovoltaic panel is arranged above the gas storage device of each group of heat supply and energy storage units.
2. The above-water photovoltaic system capable of reducing grid-connection impact on a power grid as claimed in claim 1, wherein at least two heat exchangers are arranged in the heat exchange box, an air outlet of the air compressor is divided into at least two branches and then is respectively connected with the heat exchangers in the heat exchange box in a one-to-one correspondence manner, the heat exchangers in adjacent heat exchange boxes are connected in series, after an outlet of each heat exchanger in the heat exchange box adjacent to the expander is connected with a header pipe, the header pipe is connected with the expander, and the second valve is arranged on the header pipe.
3. The above-water photovoltaic system capable of reducing grid-connection impact on a power grid as claimed in claim 2, wherein a valve is provided at an outlet of each heat exchanger in the heat exchange box adjacent to the expander.
4. The above-water photovoltaic system capable of reducing impact of grid connection on a power grid according to claim 2, wherein the branches are provided with valves so as to be controlled independently, and when some branches are in failure, other branches are in standby, so that continuous normal operation of the whole device is ensured.
5. The above-water photovoltaic system capable of reducing grid-connection impact on a power grid according to any one of claims 1 to 4, wherein the water supply system comprises a water pump and a water supply pipe, and the water pump is connected with the water inlet of the heat exchange tank through the water supply pipe.
6. The above-water photovoltaic system capable of reducing grid-connection impact on a power grid as claimed in any one of claims 1 to 4, wherein the external heating system comprises a heat storage water tank and a user, the heat storage water tank is connected with a water outlet of the heat exchange tank through a pipeline, the user is connected with the heat storage water tank, and a valve is arranged on a connecting pipeline between the user and the heat storage water tank.
7. The waterborne photovoltaic system capable of reducing impact of grid connection on a power grid according to any one of claims 1 to 4, wherein the photovoltaic panel is disposed above the gas storage device through a bracket, one end of the bracket is fixed on the gas storage device, the other end of the bracket is fixed with a groove above the gas storage device, and the photovoltaic panel is mounted in the groove.
8. The above-water photovoltaic system capable of reducing impact of grid connection on a power grid according to claim 7, wherein one end of the bracket is fixedly arranged on an air inlet pipe and/or an air outlet pipe of the air storage device.
9. The above-water photovoltaic system capable of reducing impact of grid connection on a power grid according to claim 8, wherein the support and the air inlet pipe and/or the air outlet pipe are fixedly connected through a sleeve.
10. The above-water photovoltaic system capable of reducing impact of grid connection on a power grid according to claim 8, wherein the air inlet pipe, the air outlet pipe and the air storage device are hermetically connected through flanges and gaskets.
11. The above-water photovoltaic system capable of reducing grid-connection impact on a power grid according to any one of claims 1 to 4, wherein the heat exchanger is a V-shaped heat exchanger, a water inlet of the heat exchanger is connected with a water supply pipe, and a water outlet of the V-shaped heat exchanger is connected with an external heating system.
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