CN116146424B - Offshore wind power system based on compressed air energy storage and peak shaving control method - Google Patents
Offshore wind power system based on compressed air energy storage and peak shaving control method Download PDFInfo
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Abstract
The invention discloses an offshore wind power system based on compressed air energy storage and a peak regulation control method in the technical field of offshore wind power generation energy storage grid-connected peak regulation, which comprises a wind power generation module with a wind power generator and a jacket foundation; the tidal energy collection module comprises a plurality of energy storage gas tanks with inner cavities capable of being communicated with the outside; the wave energy collecting module comprises a plurality of energy collecting air bags capable of elastically deforming, and the energy collecting air bags are communicated with the energy storage air tank through an air input pipeline; the turbine generator is electrically connected with the wind power generator and is communicated with an energy storage gas tank arranged below the energy collection air bag through an air output pipeline; and the air compressor is electrically connected with the wind power generator and is communicated with the energy storage gas tank through an air input pipeline. The invention not only realizes the comprehensive utilization and storage of wave energy, tidal energy and wind energy, but also improves the safety of the offshore wind power system.
Description
Technical Field
The invention relates to the technical field of offshore wind power generation energy storage grid-connected peak shaving, in particular to an offshore wind power system based on compressed air energy storage and a peak shaving control method.
Background
The offshore wind power does not occupy land resources, is close to a coastal power load center, can avoid resource waste caused by long-distance power transmission, and becomes a hot direction for new energy development; meanwhile, a great amount of ocean tide and ocean wave resources are distributed in coastal areas of China, and how to utilize the natural resources becomes a popular direction for new energy development.
Patent document with publication number CN110206679a discloses an energy storage integrated power generation system utilizing tides, waves and wind energy, which drives an air compression generator through water level change of seawater, thereby realizing the utilization of the tides and the wave energy, but in actual production activities, the system still has the following disadvantages:
the output power of the offshore wind power generation is affected by the offshore wind speed, is very unstable, and needs to carry out peak shaving before grid connection.
The water storage tank is located above the sea level, and safety accidents easily occur when extreme weather such as typhoons is encountered.
Disclosure of Invention
In view of the above, the invention aims to provide an offshore wind power system based on compressed air energy storage so as to solve the technical problem of grid connection peak shaving of the existing offshore wind power generation.
The technical scheme adopted by the invention is as follows: an offshore wind power system based on compressed air energy storage, comprising:
the wind power generation module comprises a wind power generator and a jacket foundation, and the wind power generator is arranged above the jacket foundation;
the tidal energy collection module is fixedly connected with the jacket foundation and comprises a plurality of energy storage gas tanks, wherein the inner cavities of the energy storage gas tanks can be communicated with the outside;
the wave energy collecting module is fixedly connected with the jacket foundation and comprises a plurality of energy collecting air bags capable of elastically deforming, the energy collecting air bags are communicated with the energy storage air tank through air input pipelines, and the air input pipelines are provided with first air inlet check valves which allow air in the energy collecting air bags to flow to the energy storage air tank;
the turbine module comprises a turbine generator electrically connected with the low-pressure side of the wind driven generator, the turbine generator is communicated with an energy storage air tank arranged below the energy collection air bag through an air output pipeline, and a first air outlet one-way valve which allows compressed air in the energy storage air tank to flow to the turbine generator and drives the turbine module is arranged on the air output pipeline;
the electric energy conversion module is electrically connected with the wind power generator and comprises an air compressor, and the air compressor is communicated with the energy storage gas tank through an air input pipeline and can output compressed air to the energy storage gas tank.
Preferably, the offshore wind power system further comprises a vacuumizing module, the vacuumizing module comprises a vacuumizing machine, a vacuumizing pipeline and a vacuumizing valve, one end of the vacuumizing pipeline is communicated with an air input pipeline, the vacuumizing machine and the vacuumizing valve are sequentially arranged on the vacuumizing pipeline and can vacuumize the energy collecting air bag, and a pressure release valve for discharging compressed air in the energy storage air tank is arranged on the air output pipeline.
Preferably, the offshore wind power system further comprises an electrochemical energy storage module, and the electrochemical energy storage module is electrically connected with the wind power generation module.
Preferably, the tidal energy collection module further comprises a pressure gauge, a liquid level gauge, a water supply and drainage pipeline, a water supply and drainage valve and a seawater filter, wherein the liquid level gauge is arranged in the energy storage gas tank and can detect liquid level information in the energy storage gas tank; the pressure gauge is arranged on the energy storage gas tank and can detect the information of the internal gas pressure of the energy storage gas tank; the water supply and drainage pipeline is communicated with the bottom of the energy storage gas tank, and the water supply and drainage valve and the seawater filter are arranged on the water supply and drainage pipeline.
Preferably, the wave energy collecting module further comprises a first air inlet branch pipe, a first air filter, a first air inlet control valve and a second air inlet check valve, one end of the first air inlet branch pipe is communicated with an air inlet of the energy collecting air bag, the first air inlet control valve, the first air filter and the second air inlet check valve are sequentially arranged on the first air inlet branch pipe, and the energy collecting air bags are arranged in parallel.
Preferably, one end of the air input pipeline, which is close to the energy storage air tank, is provided with a first air inlet check valve, one end of the air input pipeline, which is close to the energy collection air bag, is communicated with a plurality of air input branches, and the other end of the air input branch is communicated with an air outlet of the energy collection air bag and is provided with a second air outlet check valve.
Preferably, the electric energy conversion module further comprises a second air inlet branch pipe, a second air filter and a second air inlet control valve, one end of the second air inlet branch pipe is communicated with the air input pipeline, and the second air filter, the air compressor and the second air inlet control valve are sequentially arranged on the second air inlet branch pipe.
The second aim of the invention is to provide a peak shaving control method of an offshore wind power system based on compressed air energy storage, which comprises the following steps:
s10: acquiring real-time power P0 of a wind power generation module and water level information H0 of a sea area where the wind power generation module is located, and comparing the real-time power P0 with power grid admission power P1 and the water level information H0 with preset water level information H1; if P0 & gt P1 and H0 < H1, executing S20; if P0 & gt P1 and H0 & gt H1, executing S30; if P0 is smaller than P1 and H0 is smaller than H1, S40 is executed; if P0 is smaller than P1 and H0 is larger than H1, S50 is executed;
s20: comparing the difference value P2 of the real-time power generation power P0 and the power grid admission power P1 with the power consumption power P3 of the electric energy conversion module; if P2 & gt P3, converting part of surplus power of the wind power generation module into internal energy of compressed air through the electric energy conversion module to store energy, and simultaneously converting the rest surplus power of the wind power generation module into chemical energy through the electrochemical energy storage module to store energy; if P2 is less than or equal to P3, converting all surplus power of the wind power generation module into internal energy of compressed air through the electric energy conversion module to store energy;
s30: converting surplus power of the wind power generation module into chemical energy through the electrochemical energy storage module to store energy;
s40: the chemical energy of the electrochemical energy storage module is released, so that the power generation P0 of the wind power generation module is improved;
s50: firstly, the energy content of compressed air of the tidal energy collection module is released, so that the power P0 of the wind power generation module is improved; and then the chemical energy of the electrochemical energy storage module is released, so that the power generation P0 of the wind power generation module is improved.
The invention has the beneficial effects that:
the energy storage air tanks and the energy collecting air bags are fixedly arranged on the basis of a jacket of the offshore wind power module, and are communicated through an air input pipeline; when the marine wave impacts the energy collecting air bag, the wave energy can be converted into air internal energy through the elastic deformation of the energy collecting air bag and stored in the energy storage air tank; and the energy storage air tank is arranged below the energy collection air bag, and when tide rises, the tidal energy of the seawater can be converted into the internal energy of the compressed air through the water level change inside and outside the energy storage air tank and stored in the energy storage air tank. According to the invention, the turbine generator is electrically connected with the wind power generator, and the wind power generator is electrically connected with the air compressor, when the power of the wind power generator is high, the air compressor can be driven by consuming the electric energy of the wind power generator and compressed air is input into the energy storage gas tank, so that surplus electric energy of the wind power generator is converted into internal energy of the compressed air for storage; when the power of the wind driven generator is smaller, the compressed air in the energy storage gas tank can be released to drive the turbine generator to rotate, so that the output power of the wind driven generator is increased, and grid-connected peak shaving of offshore wind power generation is realized.
According to the invention, one end of the air input pipeline is connected with the vacuumizing machine, and the air output pipeline is provided with the pressure release valve, so that the air input pipeline and the energy collecting air bag can be vacuumized by the vacuumizing machine when typhoon weather is encountered, and the energy collecting air bag is prevented from conveying air to the energy storage air tank; meanwhile, by opening the pressure release valve, seawater can enter the energy storage gas tank and compressed air is completely discharged, so that the weight of the offshore wind power system is increased, and the wind wave resistance of the offshore wind power system is improved.
Drawings
FIG. 1 is a schematic diagram of a compressed air energy storage based offshore wind power system of the present invention;
FIG. 2 is a three-dimensional simulation diagram of the offshore wind power system based on compressed air energy storage of the invention;
FIG. 3 is a schematic diagram of the offshore wind power system based on compressed air energy storage of the present invention;
FIG. 4 is an electrical wiring diagram of the compressed air energy storage based offshore wind power system of the present invention;
FIG. 5 is a schematic diagram of a structure of an energy storage tank;
fig. 6 is a schematic perspective view of an energy collecting airbag.
The reference numerals in the drawings illustrate:
10. an offshore booster station;
100. a wind power generation module;
110. a wind power generator; 120. a jacket foundation; 130. a fan boosting device;
200. a tidal energy harvesting module;
210. an energy storage gas tank; 220. a pressure gauge; 230. a liquid level gauge; 240. a water supply and drainage pipeline; 250. a water supply and drainage valve; 260. a seawater filter;
300. a wave energy collection module;
310. an energy collecting air bag; 320. a first intake manifold; 330. a first air filter; 340. a first intake control valve; 350. a second air intake check valve;
311. a mounting part; 312. a bellows balloon; 313. a return spring;
400. a steam turbine module;
410. a turbo generator;
500. an electric energy conversion module;
510. an air compressor; 520. a second intake manifold; 530. a second air filter; 540. a second intake control valve;
600. an air input line;
610. a first intake check valve; 620. a second air outlet one-way valve;
700. an air output line;
710. a first air outlet one-way valve; 720. a pressure release valve; 730. a gas transmission control valve;
800. a vacuum pumping module;
810. a vacuum extractor; 820. a vacuumizing pipeline; 830. a vacuum valve;
900. an electrochemical energy storage module.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
1-6, an offshore wind power system based on compressed air energy storage, the system comprising:
the wind power generation module 100, the wind power generation module 100 includes a wind power generator 110 and a jacket base 120, and the wind power generator 110 is installed above the jacket base 120 and fixedly connected with the jacket base 120.
The tidal energy collection module 200 is fixedly connected with the jacket foundation 120, the tidal energy collection module 200 includes a plurality of energy storage tanks 210, and an inner cavity of each energy storage tank 210 can communicate with the outside.
The wave energy collection module 300, the wave energy collection module 300 is fixedly connected with the jacket foundation 120, and the wave energy collection module 300 comprises a plurality of energy collection air bags 310 capable of elastic deformation; the air outlet of the energy collecting air bag 310 is communicated with the air inlet of the energy storage air tank 210 through an air input pipeline 600, and a first air inlet check valve 610 which allows the air in the energy collecting air bag 310 to flow to the energy storage air tank 210 is arranged on the air input pipeline 600.
The turbine module 400, the turbine module 400 includes a turbine generator 410 electrically connected to the low-voltage side of the wind power generator 110, and an air inlet of the turbine generator 410 is communicated with an air outlet of the energy storage air tank 210 through an air output pipeline 700, the energy storage air tank 210 is disposed below the energy collection air bag 310, and a first air outlet check valve 710 allowing compressed air in the energy storage air tank 210 to flow to the turbine generator 410 and driving the turbine module 400 to supplement power to the wind power generation module 100 is disposed on the air output pipeline 700.
The electric energy conversion module 500 is electrically connected with the wind power generator 110, and the electric energy conversion module 500 includes an air compressor 510, and an air outlet of the air compressor 510 is communicated with an air inlet of the energy storage air tank 210 through an air input pipeline 600 and can output compressed air to the energy storage air tank 210.
The energy storage gas tanks 210 and the energy collecting gas bags 310 are fixedly arranged on the jacket foundation 120, the energy storage gas tanks 210 and the energy collecting gas bags 310 are communicated through the air input pipeline 600, and when the energy collecting gas bags 310 are impacted by ocean waves, the wave energy can be converted into air internal energy through the elastic deformation of the energy collecting gas bags 310 and stored in the energy storage gas tanks 210; meanwhile, the energy storage tank 210 is disposed below the energy collection bladder 310, and tidal energy of seawater can be converted into air energy through water level change inside and outside the energy storage tank 210 and stored in the energy storage tank 210 during the tide rising process. According to the invention, the turbine generator 410 is electrically connected with the wind driven generator 110, and the wind driven generator 110 is electrically connected with the air compressor 510, when the power of the wind driven generator 110 is high, the air compressor 510 can be driven by consuming the electric energy of the wind driven generator 110, and compressed air is input into the energy storage gas tank 210, so that the surplus electric energy of the wind driven generator 110 is converted into the internal energy of the compressed air for storage; when the power of the wind driven generator 110 is smaller, the compressed air in the energy storage tank 210 can drive the turbine generator 410 to rotate, so that the output power of the wind driven generator 110 is increased, and grid-connected peak shaving of offshore wind power generation is realized.
In a specific embodiment, as shown in fig. 1 and 3, the offshore wind power system further comprises a vacuum module 800, and the vacuum module 800 comprises a vacuum extractor 810, a vacuum pipeline 820 and a vacuum valve 830; wherein, one end of the vacuumizing pipe 820 is communicated with the air inlet end of the air input pipe 600, and the other end is communicated with the atmosphere; the vacuum pump 810 and the vacuum valve 830 are sequentially disposed on the vacuum pump 820, and the vacuum pump 810 can pump vacuum to the energy collecting air bag 310, so that the energy collecting air bag 310 is in a contracted state, to prevent the energy collecting air bag 310 from delivering air to the energy storage air tank 210; meanwhile, a pressure release valve 720 for discharging compressed air in the energy storage gas tank 210 is arranged on the air output pipeline 700, and is used for discharging part or all of the compressed air in the energy storage gas tank 210, so that seawater flows into the energy storage gas tank 210, the gravity action of the energy storage gas tank 210 on the jacket foundation 120 is increased, and the stability of the offshore power generation system is further improved.
This is so arranged because: when the wind power system is subjected to extreme weather such as typhoons, the wind power system on the sea is easy to topple and damage due to insufficient stability. In this embodiment, after the vacuumizing pipe 820 of the vacuumizing module 800 is communicated with the air input pipe 600 between the energy collecting air bag 310 and the energy storage air tank 210, the air in the energy collecting air bag 310 and the air input pipe 600 can be completely pumped out by the vacuumizing machine 810, so that the energy collecting air bag 310 is prevented from delivering air to the energy storage air tank 210; simultaneously, by opening the pressure release valve 720 on the air output pipeline 700, the compressed air in the energy storage gas tank 210 can be completely discharged, and the seawater enters the energy storage gas tank 210, so that the gravity of the offshore wind power system is increased, the stability of the offshore wind power system is further improved, and the storm resistance of the offshore wind power system is improved.
In a specific embodiment, as shown in FIG. 3, the offshore wind power system further comprises an electrochemical energy storage module 900; the electrochemical energy storage module 900 is electrically connected with the wind power generation module 100 and is used for electrochemically storing surplus power output by the wind power generation module 100, and meanwhile, when the output power of the wind power generation module 100 is insufficient, the electrochemical energy storage module 900 can output electric energy to the wind power generation module 100 so as to stabilize the power generation power of the wind power generation module 100 and realize grid-connected peak regulation of the wind power generation module 100.
What is required is: the wind power generation module 100 includes a wind power generator 110 and a wind turbine booster device 130, and the turbine module 400 and the electrochemical energy storage module 900 are electrically connected to the low voltage side of the wind power generator 110, respectively, that is, the turbine module 400 and the electrochemical energy storage module 900 are electrically connected to the upstream of the wind turbine booster device 130, respectively, and the wind turbine booster device 130 is used for boosting the power output from the wind power generator 110, the turbine module 400 and the electrochemical energy storage module 900.
In one embodiment, as shown in fig. 1 and 5, the tidal energy collection module 200 further includes a pressure gauge 220, a level gauge 230, a water supply and drain line 240, a water supply and drain valve 250, and a seawater filter 260; wherein the level gauge 230 is disposed inside the tank 210, and the level gauge 230 is capable of detecting the level information in the tank 210; the pressure gauge 220 is disposed on the tank 210, and the pressure gauge 220 can detect the air pressure information inside the tank 210; the water supply and drainage pipeline 240 is communicated with a water inlet and outlet at the bottom of the energy storage tank 210, and a water supply and drainage valve 250 and a seawater filter 260 are arranged on the water supply and drainage pipeline 240 for controlling the seawater to enter and exit the energy storage tank 210.
This is so arranged because: the water supply and drainage pipeline 240 is communicated with the water inlet and outlet at the bottom of the energy storage gas tank 210, and the inner cavity of the energy storage gas tank 210 is communicated with the external space through the water supply and drainage pipeline 240, so that a communicating vessel is formed inside and outside the energy storage gas tank 210, and the pressure of the energy storage gas tank 210 to the compressed air output from outside is kept stable. A liquid level meter 230 is arranged in the energy storage gas tank 210, and real-time liquid level information in the energy storage gas tank 210 can be obtained through the liquid level meter 230; the pressure gauge 220 is arranged on the energy storage gas tank 210, and real-time pressure information of compressed air in the energy storage gas tank 210 can be obtained through the pressure gauge 220, so that the pressure of the compressed air is prevented from being too high.
In one embodiment, as shown in FIG. 1, the wave energy collection module 300 further comprises a first air intake manifold 320, a first air filter 330, a first air intake control valve 340, and a second air intake check valve 350; wherein one end of the first air inlet branch pipe 320 is communicated with an air inlet of the energy collecting air bag 310, and the other end is communicated with the atmosphere; the first air intake control valve 340, the first air filter 330, and the second air intake check valve 350 are sequentially disposed on the first air intake manifold 320 in the air flow direction; a plurality of energy collecting airbags 310 are disposed in parallel between the first air inlet manifold 320 and the air input line 600, and each energy collecting airbag 310 is fixedly installed at the top of the jacket foundation 120.
Preferably, the air input pipeline 600 is provided with a first air inlet check valve 610 at one end close to the energy storage tank 210, that is, the air output end of the air input pipeline 600 is provided with a first air inlet check valve 610; the air input pipeline 600 has a plurality of air input branches near one end of the energy collecting air bag 310, that is, the air inlet end of the air input pipeline 600 has a plurality of air input branches connected in parallel, and the other end of each air input branch is connected with the air outlet of one energy collecting air bag 310, and a second air outlet check valve 620 is disposed on each air input branch to prevent air from flowing between the energy collecting air bags 310.
More preferably, in order to convert wave energy into internal energy of the compressed air flowing into the tank 210, the energy collecting bladder 310 includes a mounting portion 311, a bellows bladder 312, and a return spring 313; wherein, the installation part 311 can be fixedly connected with the jacket foundation 120 and is provided with an air inlet and an air outlet; the open end of the bellows airbag 312 is fixedly connected with the mounting portion 311, the return spring 313 is coaxially and fixedly mounted inside the bellows airbag 312, and both ends of the return spring 313 are respectively abutted against the bellows airbag 312 and the mounting portion 311, so that the energy collecting airbag 310 can be axially compressed and axially reset.
In one embodiment, as shown in FIG. 1, the power conversion module 500 further includes a second intake manifold 520, a second air filter 530, and a second intake control valve 540; wherein, one end of the second air inlet branch pipe 520 is communicated with the air inlet end of the air input pipeline 600, and the other end is communicated with the atmosphere; and a second air filter 530, an air compressor 510, and a second intake control valve 540 are sequentially provided on the second intake manifold 520 in the flow direction of the compressed air.
This is so arranged because: when the output power of the wind power generation module 100 is greater than the grid-connected power of the power grid, the air compressor 510 can be driven by the surplus power of the wind power generation module 100 to compress air, so as to convert the surplus electric energy of the wind power generation module 100 into the internal energy of the compressed air, and the compressed air is conveyed to the energy storage tank 210 for storage.
An embodiment of the method for controlling peak shaving of an offshore wind power system based on compressed air energy storage comprises the following steps:
s10: acquiring real-time power P0 of the wind power generation module 100 and water level information H0 of a sea area where the wind power generation module 100 is located, and comparing the real-time power P0 with power grid receiving power P1 and the water level information H0 with preset water level information H1; if P0 & gt P1 and H0 < H1, executing S20; if P0 & gt P1 and H0 & gt H1, executing S30; if P0 is smaller than P1 and H0 is smaller than H1, S40 is executed; if P0 is smaller than P1 and H0 is larger than H1, S50 is executed.
S20: comparing the difference value P2 of the real-time generation power P0 and the grid admission power P1 with the power consumption power P3 of the electric energy conversion module 500; if P2 & gt P3, converting part of surplus power of the wind power generation module 100 into internal energy of compressed air through the electric energy conversion module 500 and storing energy in the energy storage gas tank 210, and simultaneously converting the rest surplus power of the wind power generation module 100 into chemical energy through the electrochemical energy storage module 900 for storing energy; if P2 is less than or equal to P3, the electric energy conversion module 500 converts the total surplus power of the wind power generation module 100 into the internal energy of compressed air and stores the energy in the energy storage tank 210.
S30: the surplus power of the wind power generation module 100 is converted into chemical energy through the electrochemical energy storage module 900 to store energy.
S40: by releasing the chemical energy of the electrochemical energy storage module 900, the power generation P0 of the wind power generation module 100 is increased.
S50: firstly, the energy content of the compressed air of the tidal energy collection module 200 is released to improve the power generation P0 of the wind power generation module 100; and then the chemical energy of the electrochemical energy storage module 900 is released, so that the power generation P0 of the wind power generation module 100 is improved.
The working principle of the offshore wind power system is as follows:
utilization of tidal energy: the air pressure in the energy storage air tank 210 can rise or fall along with the rise and fall of the tide level, and the utilization of the tide energy is realized by the way of low tide level inflation and high tide level deflation; the tidal range of a part of sea areas can reach 20% -30% of the water depth, and the available tidal energy is in direct proportion to the energy storage capacity, so that the method has high utilization value.
The tidal energy utilization is realized by inputting compressed air at low tide level and releasing compressed air at high tide level, and the current water level can be judged by the pressure gauge 220 in specific implementation, and the system control is performed by combining with specific energy storage state.
The water level information of the sea area where the wind power generation module 100 is located is H0, and the preset water level information H1 is the average sea level; the real-time generated power of the wind power generation module 100 is P0, and the received power of the grid is P1.
When the water level is lower (H0 is less than H1) and energy storage (P0 is more than P1) is needed, compressed air is preferably used for energy storage.
The method comprises the following steps: when peak shaving power P2 (the difference between the generated power of the wind driven generator 110 and the power which can be received by the power grid) is larger than the power of the air compressor 510, the extra power is temporarily stored by adopting a chemical battery; when the peak shaving power is less than the air compressor 510 power, a chemical battery is used to supplement the air compressor 510 with energy.
When the water level is low (H0 < H1) and discharge (P0 < P1) is required, the discharge of the chemical battery is preferentially adopted, and then the discharge of the compressed air is adopted, namely, the chemical energy of the electrochemical energy storage module 900 is released firstly, so that the power generation P0 of the wind power generation module 100 is improved, and the internal energy of the compressed air of the tidal energy collection module 200 is released, so that the power generation P0 of the wind power generation module 100 is improved. When the water level is high (H0 & gt H1) and discharge is required (P0 & gt P1), the compressed air is preferably adopted to release energy, and additional tidal energy is obtained, namely, the internal energy of the compressed air of the tidal energy collection module 200 is released to improve the power generation P0 of the wind power generation module 100, and the chemical energy of the electrochemical energy storage module 900 is released to improve the power generation P0 of the wind power generation module 100.
When the water level is higher (H0 & gt H1) and energy storage (P0 & gt P1) is needed, electrochemical energy storage is preferentially adopted; that is, surplus power of the wind power generation module 100 is converted into chemical energy by the electrochemical energy storage module 900 for energy storage.
The water level in the method is higher and preferably 2-3 hours before and after the astronomical tide high-tide level time, and the water level is lower and preferably 2-3 hours before and after the astronomical tide low-tide level time.
Wave energy utilization: the energy collecting air bag 310 can be driven by waves, and when the wave crest passes through the offshore wind power system, the air in the energy collecting air bag 310 is compressed into the air input pipeline 600 through the second air outlet one-way valve 620 by the larger wave impact force; when the trough passes through the offshore wind power system, the pressure born by the energy collecting air bag 310 is smaller, the energy collecting air bag 310 is reset under the action of the elastic force of the reset spring 313, and meanwhile, air is sucked into the energy collecting air bag 310 through the second air inlet one-way valve 350, so that the wave energy is utilized to compress the air, and the storage of the wave energy is realized. The wave energy collection modules are uniformly arranged according to the water level change area of the specific wind farm field.
Wind energy utilization: the system takes a mature offshore wind power platform as a structural foundation, wind energy is taken as a main power generation means, and peak shaving power of wind power generation is stored by compressed air and chemical batteries.
Compressed air energy storage state: in the inflated state, the first air inlet control valve 340 on the first air inlet branch pipe 320 is in an opened state, the energy collecting air bag 310 of the wave energy collecting module sucks air from the second air inlet check valve 350 into the energy collecting air bag 310 by using the circulating pressure of waves, compresses the air into the air input pipeline 600 through the second air outlet check valve 620, and finally stores the compressed air into the energy storage air tank 210 through the first air inlet check valve 610.
Meanwhile, when the fan cannot be connected to the power grid at full power, the second air inlet control valve 540 and the air compressor 510 on the second air inlet branch pipe 520 are opened to compress air into the energy storage air tank 210, and the water supply and drainage valve 250 on the water supply and drainage pipeline 240 communicated with the energy storage air tank 210 is in an open state for draining seawater in the energy storage air tank 210; when the pressure gauge monitors that the pressure in the energy storage gas tank 210 is too high, the pressure release valve 720 on the air output pipeline 700 can be opened, so that the pressure in the energy storage gas tank 210 is stable, and the safety of the offshore wind power system is further ensured.
Compressed air discharge state: when the compressed air is to be used for generating electricity, the air transmission control valve 730 on the air output pipeline 700 is opened, so that the compressed air in the energy storage air tank 210 passes through the air output pipeline 700 from the first air outlet check valve 710 to drive the turbine generator 410 to rotate, thereby driving the turbine module 400 to generate electricity and increasing the output power of the wind driven generator 110. The accumulator tank 210 uses the water pressure at the sea floor, thus ensuring that the compressed air is within a relatively stable pressure range. When the level gauge 230 detects that the water level in the tank 210 is too high, the gas transmission control valve 730 on the air output pipeline 700 and the water supply and drainage valve 250 on the water supply and drainage pipeline 240 are closed, and power generation is stopped.
Storm self-storage state: when a storm is coming or waves are large, the first air inlet control valve 340 on the first air inlet branch pipe 320 and the second air inlet control valve 540 on the second air inlet branch pipe 520 are closed, then the vacuumizing valve 830 on the vacuumizing pipe 820 is opened, and the vacuumizing machine 810 is operated, so that air in the air input pipe 600 and the energy collecting air bag 310 is discharged, and the energy collecting air bag 310 is in a contracted closed state, so that the device is not damaged by the storm. Simultaneously, the pressure release valve 720 on the air output pipeline 700 is opened, so that the compressed air in the energy storage gas tank 210 is completely discharged under the action of the seawater pressure, the seawater is injected into the energy storage gas tank 210 to form ballast water, and the integral anti-capsizing performance of the structure is improved.
Compared with the prior art, the application has at least the following beneficial technical effects:
the wind power jacket foundation structure based on the existing mature offshore wind power is used as a structural platform, comprehensive utilization and storage of wave energy, tidal energy and wind energy are achieved, and the wind power jacket foundation structure has the advantages of being few in energy conversion steps and strong in universality of power generation and energy storage related equipment, and the tidal energy, the wave energy and the energy storage equipment share one set of steam turbine generator.
The application adopts the deep sea energy storage gas pitcher to use the low pressure compressed air of constant voltage normal atmospheric temperature as energy storage medium, and deep sea position water pressure is compressed air's atmospheric pressure promptly to realize the tidal energy utilization through the mode that low tide level was inflated and high tide level was gassing.
The energy collecting air bag is pushed to compress by wave energy, the wave energy is converted into compressed air for storage, and surplus electricity which is generated by the wind driven generator and cannot be connected with the grid is converted into internal energy of the compressed air for storage through the air compressor or is directly stored by adopting a chemical battery; and the control system of the whole system is integrated with the fan control system, and the electric power is connected to the low-voltage end of the fan and then connected to the offshore booster station through the fan boosting transformer end and the wind power plant current collecting circuit.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (8)
1. An offshore wind power system based on compressed air energy storage, comprising:
the wind power generation system comprises a wind power generation module (100), wherein the wind power generation module (100) comprises a wind power generator (110) and a jacket foundation (120), and the wind power generator (110) is arranged above the jacket foundation (120);
the tidal energy collection module (200) is fixedly connected with the jacket foundation (120), and the tidal energy collection module (200) comprises a plurality of energy storage gas tanks (210) with inner cavities capable of being communicated with the outside;
the wave energy collection module (300), the wave energy collection module (300) is fixedly connected with the jacket foundation (120), the wave energy collection module (300) comprises a plurality of energy collection air bags (310) which can be elastically deformed, the energy collection air bags (310) are communicated with the energy storage air tank (210) through an air input pipeline (600), and a first air inlet check valve (610) which allows air in the energy collection air bags (310) to flow to the energy storage air tank (210) is arranged on the air input pipeline (600);
the turbine module (400), the turbine module (400) comprises a turbine generator (410) electrically connected with the wind driven generator (110), the turbine generator (410) is communicated with an energy storage air tank (210) arranged below the energy collection air bag (310) through an air output pipeline (700), and a first air outlet check valve (710) allowing compressed air in the energy storage air tank (210) to flow to the turbine generator (410) is arranged on the air output pipeline (700);
the electric energy conversion module (500), electric energy conversion module (500) are connected with aerogenerator (110) electricity, just electric energy conversion module (500) include air compressor (510), air compressor (510) are through air input pipeline (600) and energy storage gas pitcher (210) intercommunication and can export compressed air to energy storage gas pitcher (210).
2. The offshore wind power system based on compressed air energy storage according to claim 1, further comprising a vacuumizing module (800), wherein the vacuumizing module (800) comprises a vacuumizing machine (810), a vacuumizing pipeline (820) and a vacuumizing valve (830), one end of the vacuumizing pipeline (820) is communicated with the air input pipeline (600), the vacuumizing machine (810) and the vacuumizing valve (830) are sequentially arranged on the vacuumizing pipeline (820) and can vacuumize the energy collecting air bag (310), and a pressure release valve (720) for discharging compressed air in the energy storage air tank (210) is arranged on the air output pipeline (700).
3. An offshore wind power system based on compressed air energy storage according to claim 1, further comprising an electrochemical energy storage module (900), the electrochemical energy storage module (900) being electrically connected with the wind power generation module (100).
4. The offshore wind power system based on compressed air energy storage according to claim 1, wherein the tidal energy collection module (200) further comprises a pressure gauge (220), a liquid level gauge (230), a water supply and drainage pipeline (240), a water supply and drainage valve (250) and a seawater filter (260), wherein the liquid level gauge (230) is arranged inside the energy storage tank (210) and can detect liquid level information in the energy storage tank (210); the pressure gauge (220) is arranged on the energy storage gas tank (210) and can detect the internal gas pressure information of the energy storage gas tank (210); the water supply and drainage pipeline (240) is communicated with the bottom of the energy storage gas tank (210), and the water supply and drainage valve (250) and the seawater filter (260) are arranged on the water supply and drainage pipeline (240).
5. The offshore wind power system based on compressed air energy storage according to claim 1, wherein the wave energy collection module (300) further comprises a first air inlet branch pipe (320), a first air filter (330), a first air inlet control valve (340) and a second air inlet check valve (350), one end of the first air inlet branch pipe (320) is communicated with an air inlet of the energy collecting air bag (310), the first air inlet control valve (340), the first air filter (330) and the second air inlet check valve (350) are sequentially arranged on the first air inlet branch pipe (320), and a plurality of the energy collecting air bags (310) are arranged in parallel.
6. The offshore wind power system based on compressed air energy storage according to claim 5, wherein a first air inlet check valve (610) is arranged at one end of the air input pipeline (600) close to the energy storage air tank (210), a plurality of air input branches are communicated with one end of the air input pipeline (600) close to the energy collection air bag (310), and the other end of the air input branches is communicated with an air outlet of the energy collection air bag (310) and provided with a second air outlet check valve (620).
7. The offshore wind power system based on compressed air energy storage according to claim 1, wherein the electric energy conversion module (500) further comprises a second air inlet branch pipe (520), a second air filter (530) and a second air inlet control valve (540), one end of the second air inlet branch pipe (520) is communicated with the air input pipeline (600), and the second air filter (530), the air compressor (510) and the second air inlet control valve (540) are sequentially arranged on the second air inlet branch pipe (520).
8. A method for controlling peak shaving of an offshore wind power system based on compressed air energy storage, the method using the offshore wind power system based on compressed air energy storage according to claim 1, the method comprising the steps of:
s10: acquiring real-time power P0 of a wind power generation module (100) and water level information H0 of a sea area where the wind power generation module (100) is located, and comparing the real-time power P0 with power receiving power P1 of a power grid and the water level information H0 with preset water level information H1; if P0 & gt P1 and H0 < H1, executing S20; if P0 & gt P1 and H0 & gt H1, executing S30; if P0 is smaller than P1 and H0 is smaller than H1, S40 is executed; if P0 is smaller than P1 and H0 is larger than H1, S50 is executed;
s20: comparing the difference value P2 of the real-time generation power P0 and the grid admission power P1 with the consumption power P3 of the electric energy conversion module (500); if P2 & gt P3, converting part of surplus power of the wind power generation module (100) into internal energy of compressed air through the electric energy conversion module (500) to store energy, and simultaneously converting the rest surplus power of the wind power generation module (100) into chemical energy through the electrochemical energy storage module (900) to store energy; if P2 is less than or equal to P3, converting all surplus power of the wind power generation module (100) into internal energy of compressed air through the electric energy conversion module (500) to store energy;
s30: the surplus power of the wind power generation module (100) is converted into chemical energy through the electrochemical energy storage module (900) to store energy;
s40: by releasing the chemical energy of the electrochemical energy storage module (900), the power generation P0 of the wind power generation module (100) is improved;
s50: firstly, the energy content of compressed air of the tidal energy collection module (200) is released, so that the power generation P0 of the wind power generation module (100) is improved; and then the chemical energy of the electrochemical energy storage module (900) is released, so that the power generation P0 of the wind power generation module (100) is improved.
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| CN107559146A (en) * | 2017-10-12 | 2018-01-09 | 华能国际电力股份有限公司 | A kind of offshore wind power system with seabed compressed-air energy storage |
| CN110206679A (en) * | 2019-06-10 | 2019-09-06 | 江利 | A kind of energy storage comprehensive generating system using tide, wave and wind energy |
| CN110360056A (en) * | 2019-08-08 | 2019-10-22 | 西安热工研究院有限公司 | Indirect-cooling sea air accumulation energy type wind generator system and operation method |
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