阅读说明：本技术 海上风机塔筒海水压缩空气储能系统及其使用方法 (Seawater compressed air energy storage system for offshore fan tower and using method thereof ) 是由 杨润童 于 2020-12-24 设计创作，主要内容包括：本发明提供了一种海上风机塔筒海水压缩空气储能系统及其使用方法,其中海上风机塔筒海水压缩空气储能系统,包括海上风力发电机、输电线路,还包括：依次连接的海水抽吸管道、高压水泵、注水管道、塔筒内海水储能单元、塔筒内压缩空气储能单元、泄水管道、水轮发电机、海上排放管道；所述高压水泵驱动电源来自风力发电机发电出线或电网连接接线；所述水轮发电机出线连接电网；利用此系统可以实现海上风电的储能蓄电,并利用海水和风塔塔筒实现抽水蓄能和压缩空气储能,使得海上风力发电机成为灵活响应电网调峰调频信号的友好型电源。(The invention provides an offshore wind turbine tower drum seawater compressed air energy storage system and a using method thereof, wherein the offshore wind turbine tower drum seawater compressed air energy storage system comprises an offshore wind driven generator and a power transmission line, and further comprises: the seawater energy storage device comprises a seawater suction pipeline, a high-pressure water pump, a water injection pipeline, a seawater energy storage unit in a tower, a compressed air energy storage unit in the tower, a water drain pipeline, a hydraulic generator and an offshore discharge pipeline which are sequentially connected; the high-pressure water pump driving power supply is from a wind driven generator power generation outlet or a power grid connection wire; the outlet wire of the hydraulic generator is connected with a power grid; the system can realize the energy storage and the electric power storage of offshore wind power, and realize pumped storage and compressed air energy storage by utilizing seawater and a wind tower barrel, so that an offshore wind driven generator becomes a friendly power supply which flexibly responds to a power grid peak regulation and frequency modulation signal.)

1. The utility model provides an offshore wind turbine tower section of thick bamboo sea water compressed air energy storage system, includes offshore wind power generation machine, transmission line, its characterized in that still includes: the seawater energy storage device comprises a seawater suction pipeline, a high-pressure water pump, a water injection pipeline, a seawater energy storage unit in a tower, a compressed air energy storage unit in the tower, a water drain pipeline, a hydraulic generator and an offshore discharge pipeline which are sequentially connected; the high-pressure water pump driving power supply is from a wind driven generator power generation outlet or a power grid connection wire; the outlet wire of the hydraulic generator is connected with a power grid.

2. The offshore wind turbine tower drum seawater compressed air energy storage system as claimed in claim 1, wherein the seawater energy storage unit in the tower drum and the compressed air energy storage unit in the tower drum utilize the offshore wind turbine tower drum as a closed container, and the compressed air and seawater altitude difference potential energy are utilized to realize energy storage of wind power generation.

3. The offshore wind turbine tower drum seawater compressed air energy storage system of claim 1, wherein the high pressure water pump utilizes electricity which cannot be on line when offshore wind power generation is surplus in strong wind weather to drive seawater and compressed air to store energy.

4. The offshore wind turbine tower drum seawater compressed air energy storage system as claimed in claim 1, wherein the hydro-generator drives power generation and network access by using pressure energy and potential energy accumulated by the seawater energy storage unit and the compressed air energy storage unit in the tower drum in weak wind or windless weather.

5. The offshore wind turbine tower drum seawater compressed air energy storage system as claimed in claim 3 or 4, wherein the electric quantity consumed by the high pressure water pump or the electric quantity generated by the hydraulic generator responds to the peak shaving requirement of the offshore wind power grid.

6. The offshore wind turbine tower drum seawater compressed air energy storage system as claimed in claim 3 or 4, wherein the electric quantity consumed by the high pressure water pump or the electric quantity generated by the hydraulic generator responds to the power grid frequency modulation requirement of offshore wind power.

7. The seawater compressed air energy storage system of claim 1, wherein the high pressure water pump and the hydraulic generator are combined into an integrated machine, that is, wind power or grid power is used for pumping seawater for energy storage during pumping water, and a hydraulic wheel is used for driving the generator to generate power during power generation.

8. The offshore wind turbine tower seawater compressed air energy storage system of claim 1, wherein the compressed air energy storage unit comprises a tower air compression chamber, a compressed air overpressure discharge safety valve, and a compressed air parameter operation monitoring module.

9. The seawater compressed air energy storage system of claim 1, wherein the compressed air energy storage unit comprises an exhaust pipeline, an exhaust chamber, a blade exhaust chamber and a blade tail end exhaust nozzle arranged in the tower, and the blades are pushed by the compressed air exhaust nozzle to continuously generate electricity by using the wind driven generator at a low wind speed.

10. A method of using the offshore wind turbine tower seawater compressed air energy storage system as claimed in any one of claims 1 to 9, the method comprising the steps of:

s1: selecting the single capacity, size and configuration number of matched high-pressure water pumps and hydraulic generators according to the designed fan distribution condition and the diameter size of the tower drum of the offshore wind power plant;

s2: the wall thickness and the internal structure of the tower barrel are optimized by a combined fan manufacturer, and an internal overpressure protection system and a pressure relief safety valve are arranged;

s3: designing components such as a model selection high-pressure water pump, a hydraulic generator, relevant pipeline valves and the like, wherein all equipment and the components are made of materials for preventing seawater corrosion;

s4: designing an electric transmission line and a charging and discharging control cabinet which are provided with a high-pressure water pump and a hydraulic generator;

s5, designing a peak and frequency modulation control strategy of the energy storage system in cooperation with the fan;

s6: completing the installation and debugging of the field energy storage device and the control system;

s7: and the control system coordinates the energy storage device and the wind driven generator to carry out peak-shaving frequency-modulation energy storage operation.

S8: when the power grid needs the fan to reduce the on-grid electric quantity, namely when the load is reduced, the peak load is adjusted and the frequency is adjusted, the electric power generated by the fan is used for driving the high-pressure water pump to pump the seawater, so that the air in the tower barrel is compressed, the height of the seawater in the tower barrel is increased, and the seawater compressed air energy storage is realized;

s9: when the power grid needs the fan to increase the on-grid electricity quantity, namely, the load-rise peak-load-regulation frequency modulation, the seawater compressed air stored in the tower barrel is used for storing the high-pressure seawater accumulated in the energy storage to drive the hydraulic generator to generate electricity, so that the load requirement of the power grid on the load-rise peak-load-regulation frequency modulation is met;

s10: when the electric quantity on the Internet is kept basically unchanged, the automatic control is carried out according to the actual generated energy of the fan

The input amount of the seawater compressed air energy storage system in an electric storage mode or a power generation mode.

Technical Field

The invention relates to the field of wind power generation and energy storage, in particular to a system for compressing air by using seawater of an offshore wind turbine tower and a using method thereof.

Background

In order to cope with global climate change and improve the energy structure of China, wind power is widely popularized as a new renewable energy source. With the improvement of technology and manufacturing capacity, the wind power construction scale of China is gradually enlarged, the installed capacity of a wind power generator in 2013 exceeds 7500 ten thousand kilowatts, and the installed total amount is planned to reach 2 hundred million kilowatts in 2020. In the first half of 2015, 72 newly installed offshore wind power plants are added in China, the accumulated installed capacity reaches 1258 megawatts, 601 megawatts are increased compared with 2014, the total investment amount reaches 1017 million yuan, wherein large wind power plant projects are east-sea bridge offshore projects and second-phase projects thereof, dragon sources such as east-sea demonstration projects and Jiangsu such as east-extension projects, and the rest are mainly experimental demonstration prototypes installed by various wind power plant manufacturers. According to the prediction of related reports, the accumulative installed capacity of the wind power in China offshore reaches the peak value of 9104 megawatt in 2020, the accumulative total investment amount is estimated to reach 4991 billion yuan, and the annual composite growth rate is 51% and 23% respectively. Calculated according to the single machine capacity of 5 megawatts on average, at least 2000 fan devices are needed in 2020, the total capacity of the fan part manufacturing (whole machine assembly) market is expected to exceed 6000 billion yuan, and domestic mainstream fan device manufacturers can benefit from the fan device manufacturing.

The rapid development of offshore wind power faces many challenges, and the problem that wind power output is limited by system operating conditions is increasingly highlighted mainly because the randomness and intermittency of wind speed make the output of a wind power generation system fluctuate greatly. The grid-connected guide rule specifies the operating voltage and frequency range of the wind driven generator: within the specified voltage and frequency range, the wind driven generator is in an operation state even if the wind driven generator exceeds the rated operating point of the wind driven generator, but the output power can be reduced within a certain time; if the specified voltage and frequency range is exceeded, the wind turbine must automatically leave the grid within the specified time. Furthermore, for voltage sags caused by grid faults, the wind turbine must be kept in uninterrupted grid-connected operation before the grid voltage recovers to be stable. With the development of distributed wind power generation technology and the use of micro-grid, the problem of system frequency fluctuation caused by wind speed fluctuation and load sudden change is urgently solved.

Energy storage technology is technology that stores energy by means of a device or physical medium for later use when needed. Energy storage technologies are classified according to storage media and can be classified into mechanical energy storage, electrical energy storage, electrochemical energy storage, thermal energy storage, and chemical energy storage.

The pumped storage power station becomes the main technical scheme of large-scale energy storage at present, and in addition, compressed air energy storage is more and more concerned by researchers and investors. However, the existing pumped storage power station and the compressed air energy storage system have the problems of complex system and huge investment amount.

Particularly, the existing compressed air energy storage adopts an air compressor, and the compression heat generated in the air compression process can not be timely and efficiently transferred to the outside from the compressed air, so that the air compression process deviates from the isothermal compression process, a large amount of irreversible loss can be inevitably generated, and in addition, the irreversible loss of other links of the compressed air energy storage system is optimized no matter how to the energy storage system, the problem of low system efficiency cannot be solved.

Disclosure of Invention

In view of the above, the invention innovatively utilizes the space of the tower drum of the offshore wind turbine, the compressed air energy storage unit and the seawater energy storage unit are arranged in the tower drum of the wind turbine, and the high-efficiency high-pressure water pump and the hydraulic generator are utilized to realize the high-efficiency conversion of electric energy and pressure energy or seawater potential energy, thereby realizing the large-scale energy storage, peak regulation and frequency modulation of the large-scale offshore wind turbine.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides an offshore wind turbine tower section of thick bamboo sea water compressed air energy storage system, includes offshore wind power generation machine, transmission line, its characterized in that still includes: the seawater energy storage device comprises a seawater suction pipeline, a high-pressure water pump, a water injection pipeline, a seawater energy storage unit in a tower, a compressed air energy storage unit in the tower, a water drain pipeline, a hydraulic generator and an offshore discharge pipeline which are sequentially connected; the high-pressure water pump driving power supply is from a wind driven generator power generation outlet or a power grid connection wire; the outlet wire of the hydraulic generator is connected with a power grid.

Furthermore, the seawater energy storage unit in the tower cylinder and the compressed air energy storage unit in the tower cylinder utilize an offshore wind turbine tower cylinder as a closed container, and the compressed air, the seawater altitude difference potential energy and the pressure energy are utilized to realize the energy storage of the wind power generation.

Further, the high-pressure water pump drives seawater and compressed air to store energy by utilizing electric power which cannot be on line when the offshore wind power generation amount is surplus in strong wind weather.

Furthermore, the hydraulic generator drives power generation and network access by utilizing pressure energy and potential energy accumulated by the seawater energy storage unit and the compressed air energy storage unit in the tower cylinder in the weak wind or no wind weather.

Furthermore, the electric quantity consumed by the high-pressure water pump or the electric quantity generated by the hydraulic generator responds to the peak load regulation requirement of the power grid of the offshore wind power.

Furthermore, the electric quantity consumed by the high-pressure water pump or the electric quantity generated by the hydraulic generator responds to the power grid frequency modulation requirement of the offshore wind power.

Furthermore, the high-pressure water pump and the hydraulic generator are combined into an integrated machine, namely, wind power or electric network power is utilized to extract seawater for energy storage when water is pumped, and a hydraulic wheel is utilized to drive the generator to generate power when power is generated.

Further, the motor of the high-pressure water pump motor or the hydraulic generator is any one or combination of an asynchronous motor, a permanent magnet synchronous motor, a switched reluctance motor, a synchronous reluctance motor and a pole writing motor.

Further, the compressed air energy storage unit comprises a tower air compression chamber, a compressed air overpressure discharge safety valve and a compressed air parameter operation monitoring module.

Further, the compressed air energy storage unit is provided with an exhaust pipeline, an exhaust chamber, a blade exhaust chamber and a blade tail end exhaust nozzle in the tower barrel, and the blades are pushed by the compressed air exhaust nozzle to continuously utilize the wind driven generator to generate electricity at a low wind speed.

A method for compressing an energy storage system by using seawater of the offshore wind turbine tower is characterized by comprising the following steps:

s1: selecting the single capacity, size and configuration number of matched high-pressure water pumps and hydraulic generators according to the designed fan distribution condition and the diameter size of the tower drum of the offshore wind power plant;

s2: the wall thickness and the internal structure of the tower barrel are optimized by a combined fan manufacturer, and an internal overpressure protection system and a pressure relief safety valve are arranged;

s3: designing components such as a model selection high-pressure water pump, a hydraulic generator, relevant pipeline valves and the like, wherein all equipment and the components are made of materials for preventing seawater corrosion;

s4: designing an electric transmission line and a charging and discharging control cabinet which are provided with a high-pressure water pump and a hydraulic generator;

s5, designing a peak and frequency modulation control strategy of the energy storage system in cooperation with the fan;

s6: completing the installation and debugging of the field energy storage device and the control system;

s7: and the control system coordinates the energy storage device and the wind driven generator to carry out peak-shaving frequency-modulation energy storage operation.

S8: when the power grid needs the fan to reduce the on-grid electric quantity, namely when the load is reduced, the peak load is adjusted and the frequency is adjusted, the electric power generated by the fan is used for driving the high-pressure water pump to pump the seawater, so that the air in the tower barrel is compressed, the height of the seawater in the tower barrel is increased, and the seawater compressed air energy storage is realized;

s9: when the power grid needs the fan to increase the on-grid power, namely, the load-rise peak-load-regulation frequency modulation, the seawater compressed air stored in the tower barrel is used for storing the high-pressure seawater stored in the energy storage manner to drive the hydraulic generator to generate power, so that the load demand of the power grid for the load-rise peak-load-regulation frequency modulation is met.

S10: when the electric quantity on the Internet is kept basically unchanged, the automatic control is carried out according to the actual generated energy of the fan

The input amount of the seawater compressed air energy storage system in an electric storage mode or a power generation mode.

The problems of the current power grid and energy storage system mainly include:

1) the capacity of high-quality peak regulation and frequency modulation such as hydropower, pumped storage and the like is lack and is limited by regions; and the thermal power frequency modulation effect is seriously insufficient, and thermal power resources are continuously reduced slightly under the condition of war.

2) The increase of photovoltaic and wind power seriously causes the frequent fluctuation of the power grid frequency 50 HZ.

3) The current pumped storage or compressed air storage project has huge investment and overlong project recovery period.

4) The compression or expansion process of the current compressed air energy storage technology inevitably generates a large amount of irreversible loss, so that the system efficiency is not high.

The invention can effectively solve the problems and has the main beneficial effects that:

1) the energy storage peak-shaving frequency modulation of a large-scale offshore wind power plant and a single fan is realized by utilizing a seawater compressed air energy storage technology with stable performance, the power generation quality of the offshore wind power plant is greatly improved, and the influence of offshore wind power grid connection on the frequency and the voltage of a power grid is reduced.

2) The space of the fan tower drum is fully utilized, seawater compressed air energy storage equipment is efficiently configured in the fan tower drum, the connection and intercommunication of a fan generator, the energy storage equipment and a power grid are realized, and each fan can flexibly correspond to the dynamic change of the power grid frequency and the power by utilizing the seawater compressed air energy storage.

3) The seawater compressed air energy storage system can participate in the dynamic behavior of the system, responds to the rapid frequency fluctuation of the power grid, solves the problem of power grid frequency fluctuation caused by the active load change of the power grid, and enables the system to recover the stable state.

4) The seawater compressed air energy storage avoids a large amount of irreversible losses (heat production in the compression process and cold production in the expansion process) generated in the traditional compressed air energy storage process, and the high-efficiency high-pressure water pump is used for replacing a high-power air compressor or an expander, so that the system efficiency is greatly improved.

5) The high-pressure seawater pumped storage energy storage is realized by fully utilizing the large-range compressibility of air and the incompressibility of water and combining the huge tower space and the trend that the height of the offshore wind power tower is higher and higher.

Drawings

Fig. 1 is a schematic diagram of the system arrangement and connection of the present invention shown in embodiment 1.

Fig. 2 is a schematic diagram of the system arrangement and connection of the present invention shown in embodiment 2.

Fig. 3 is a schematic view of the water pump and water wheel integrated device shown in embodiment 2.

Fig. 4 is a flow chart of the steps of the peak-shaving frequency modulation method of the present invention.

In the figure:

the device comprises a high-pressure water pump 1, a hydraulic generator 2, a seawater aging unit 3, a compressed air energy storage unit 4, a fan tower drum 5, a wind driven generator 6, a wind wheel 7, an engine room 8, blades 9, a gear box 10, a main shaft 11, a water pump 12 and hydraulic generator integrated device 13, a generator 14, a motor 15, a water pump and hydraulic generator integrated machine 16 and a clutch.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The present invention will be described in detail below by way of examples.

The core of the invention is to provide a system and a method for compressing air energy by utilizing seawater of a tower drum of an offshore wind turbine.

Example 1:

referring to fig. 1, fig. 1 is a schematic view of a seawater compressed air energy storage system provided in the present invention.

Including offshore wind power generation machine, transmission line, its characterized in that still includes: the seawater energy storage device comprises a seawater suction pipeline, a high-pressure water pump, a water injection pipeline, a seawater energy storage unit in a tower, a compressed air energy storage unit in the tower, a water drain pipeline, a hydraulic generator and an offshore discharge pipeline which are sequentially connected; the high-pressure water pump driving power supply is from a wind driven generator power generation outlet or a power grid connection wire; the outlet wire of the hydraulic generator is connected with a power grid.

In this embodiment, the seawater energy storage unit in the tower and the compressed air energy storage unit in the tower use the offshore wind turbine tower as a closed container, and the compressed air, the seawater altitude difference potential energy and the pressure energy are used for realizing energy storage of wind power generation.

In this embodiment, the high-pressure water pump drives the seawater and the compressed air to store energy by using the electric power which cannot be on the internet when the offshore wind power generation amount is surplus in the strong wind weather.

In this embodiment, the hydraulic generator drives power generation and network access by using pressure energy and potential energy accumulated by the seawater energy storage unit and the compressed air energy storage unit in the tower in a weak wind or no wind weather.

In this embodiment, the electric quantity consumed by the high-pressure water pump or the electric energy generated by the hydraulic generator responds to the peak shaving demand of the power grid of the offshore wind power.

In this embodiment, the electric quantity consumed by the high-pressure water pump or the electric energy generated by the hydraulic generator responds to the power grid frequency modulation requirement of the offshore wind power.

In this embodiment, the high-pressure water pump and the hydraulic generator are combined into an integrated machine, that is, when pumping water, wind power or electric power of a power grid is used for pumping seawater for energy storage, and when generating power, the hydraulic generator is driven by the hydraulic wheel to generate power.

In this embodiment, the motor of the high-pressure water pump motor or the hydraulic generator is any one or a combination of an asynchronous motor, a permanent magnet synchronous motor, a switched reluctance motor, a synchronous reluctance motor, and a pole writing motor.

In this embodiment, the compressed air energy storage unit includes a tower air compression chamber, a compressed air overpressure discharge safety valve, and a compressed air parameter operation monitoring module.

In this embodiment, the compressed air energy storage unit is provided with an exhaust pipeline, an exhaust chamber, a blade exhaust chamber and a blade tail end exhaust nozzle in the tower, and the blade is pushed by the compressed air exhaust nozzle to continuously generate electricity by using the wind driven generator at a low wind speed.

Because the installed quantity of the offshore wind farm is large, the height of the tower drum of a single offshore wind driven generator exceeds 120 meters, the diameter of the bottom of the tower drum exceeds 8 meters, and the diameter of the upper part of the tower drum can also reach 4 meters, the volume calculation formula in the tower drum of the single wind driven generator is calculated as follows:

the volume in the tower of a single offshore wind turbine can reach 3518 cubic meters, if the offshore wind power plant is calculated according to 100 wind turbines, the total volume in the tower of the wind field reaches 351800 cubic meters, compressed air can be stored, if the compressed air and the seawater are calculated by half respectively, the compressed air can be stored for 176000 cubic meters, and the seawater can be stored for 176000 cubic meters, so that the seawater compressed air energy storage volume and the seawater energy storage energy of the total wind field are considerable.

Example 2

Referring to fig. 2 and 3, the whole system of the embodiment is similar to that of embodiment 1, but the high-pressure water pump impeller and the water turbine impeller are integrally designed, namely, the left side and the right side of the coaxial impeller are respectively connected with the generator (14) and the motor (15), and the middle of the impeller is connected with the clutch (16).

By using the same set of impeller device for the water pump impeller and the water turbine impeller which are optimally designed, when the impellers are coaxially connected with the generator, the generator can be driven to generate electricity by using seawater pressure and kinetic energy, and the working condition that the total load of a wind turbine generator set is increased or the insufficient wind power generation is supplemented is realized;

when the impeller is coaxially connected with the motor, the motor can be driven by utilizing wind power or surplus electric power of a power grid, so that seawater is extracted to realize the energy storage mode operation of seawater compressed air energy storage.

The whole system is operated according to the steps of the peak-shaving frequency-modulation method of the invention.

Example 3

Reference is made to the method step operational flow diagram shown in fig. 4. The embodiment discloses a method for compressing an energy storage system by using seawater of an offshore wind turbine tower, which is characterized by comprising the following steps of:

s1: selecting the single capacity, size and configuration number of matched high-pressure water pumps and hydraulic generators according to the designed fan distribution condition and the diameter size of the tower drum of the offshore wind power plant;

s2: the wall thickness and the internal structure of the tower barrel are optimized by a combined fan manufacturer, and an internal overpressure protection system and a pressure relief safety valve are arranged;

s3: designing components such as a model selection high-pressure water pump, a hydraulic generator, relevant pipeline valves and the like, wherein all equipment and the components are made of materials for preventing seawater corrosion;

s4: designing an electric transmission line and a charging and discharging control cabinet which are provided with a high-pressure water pump and a hydraulic generator;

s5, designing a peak and frequency modulation control strategy of the energy storage system in cooperation with the fan;

s6: completing the installation and debugging of the field energy storage device and the control system;

s7: and the control system coordinates the energy storage device and the wind driven generator to carry out peak-shaving frequency-modulation energy storage operation.

S8: when the power grid needs the fan to reduce the on-grid electric quantity, namely when the load is reduced, the peak load is adjusted and the frequency is adjusted, the electric power generated by the fan is used for driving the high-pressure water pump to pump the seawater, so that the air in the tower barrel is compressed, the height of the seawater in the tower barrel is increased, and the seawater compressed air energy storage is realized;

s9: when the power grid needs the fan to increase the on-grid power, namely, the load-rise peak-load-regulation frequency modulation, the seawater compressed air stored in the tower barrel is used for storing the high-pressure seawater stored in the energy storage manner to drive the hydraulic generator to generate power, so that the load demand of the power grid for the load-rise peak-load-regulation frequency modulation is met.

S10: when the electric quantity of the on-line power is kept basically unchanged, the automatic control is carried out according to the actual generated energy of the fan

And (4) making the investment of the seawater compressed air energy storage system in an electric power storage mode or a power generation mode.

Example 4

In this embodiment, equivalently, on the basis of embodiment 1, a compressed air energy storage unit is removed, that is, the energy storage completely depends on a high-pressure water pump to extract seawater to store in the space in the tower, and the physical potential energy and the pressure energy of the stored seawater are utilized to generate electricity by a hydraulic generator without containing compressed air energy storage.

At the moment, the hydraulic generator can be arranged at the lower part of the offshore wind power platform and is close to the position of the sea level, so that more seawater energy storage can be realized by utilizing the height difference as much as possible.

Because there is no compressed air energy storage unit, the system is relatively simple, and the lower part of the top cabin of the tower can be provided with an overflow pipeline and an overflow valve, so that the seawater pressure in the tower is ensured not to be too high, and the safety of the tower is threatened.

Example 5

In this embodiment, can couple sea water compressed air energy storage and battery energy storage or flywheel energy storage, can guarantee like this that when certain single energy storage system breaks down, switch to another energy storage mode at any time. And the battery energy storage or flywheel energy storage response rate is fast, but the energy storage is limited, and the energy storage cost is higher than that of a marine compressed air energy storage system, so that the battery or flywheel energy storage capacity of the capacity in the range of the power grid requirement single fan frequency modulation load requirement can be set, the requirement of power grid frequency modulation is met by using the energy storage form capable of fast responding, and the marine compressed air energy storage is set as the deep peak modulation energy storage capacity of the capacity in the range of the single fan peak modulation load requirement, so that the load requirement of the power grid on the fan deep peak modulation is met.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The sea water compressed air energy storage system utilizing the offshore wind turbine tower and the peak-load and frequency modulation method provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.