CN118040711A - Compressed air energy storage coupling wind power variable power tracking control method - Google Patents
Compressed air energy storage coupling wind power variable power tracking control method Download PDFInfo
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Abstract
The invention discloses a compressed air energy storage coupling wind power variable power tracking control method, which comprises the following steps: the method is used for a wind power storage station, the wind power storage station comprises a wind power system and a compressed air energy storage system, the wind power system is connected with a power grid system and is also connected with the power grid system through the compressed air energy storage system, and the method comprises the following steps: detecting the system frequency of the power grid system, and calculating the frequency variation of the power grid system according to the system frequency; and controlling the output power of the wind power system according to the frequency variation, or controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system or discharge the electric energy to the power grid system so as to stabilize the system frequency. According to the method, the primary frequency modulation of the power grid system is participated in through the cooperative control of the variable power tracking of the compressed air energy storage system and the wind power system, and the power distribution of the compressed air energy storage system and the wind power system is coordinated and controlled, so that the maximum power generation benefit is realized.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a compressed air energy storage coupling wind power variable power tracking control method.
Background
The traditional doubly-fed induction wind generating set works at a maximum power tracking operation point, namely the rotor rotating speed of the set does not change in response to the fluctuation of the frequency of a power grid. Therefore, more researches are carried out on frequency response of the wind turbine generator at home and abroad, and overspeed load shedding control and pitch angle changing control improve the overall performance and primary frequency modulation characteristic of the wind turbine generator to a certain extent, but certain spare capacity is reserved in the method, so that the maximum power generation benefit is not realized.
Although there have been researches on wind farm configuration energy storage, most of the related projects use electrochemical energy storage devices to be configured at grid-connected points of the wind farm, which has relatively small scale, short service life cycle and brings about the problems of safety and stability of electrochemical energy storage and environmental protection. The compressed air energy storage has been successfully configured on the power grid side and commercial operation is realized due to the advantages of large energy storage capacity, high flexibility in site selection, low manufacturing cost, long service life and the like. However, the conventional compressed air energy storage system needs to rely on natural gas afterburning to provide a heat source, has the problems of fuel dependence, emission pollution and the like, and is easily limited by a natural gas source.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, one purpose of the invention is to provide a compressed air energy storage coupling wind power variable power tracking control method, which realizes that a compressed air energy storage system and a wind power system are controlled to participate in primary frequency modulation of a power grid system in a variable power tracking cooperative mode, and realizes that the power generation benefit is maximized by controlling the power distribution of the compressed air energy storage system and the wind power system in a coordinated mode.
To achieve the above objective, an embodiment of a first aspect of the present invention provides a compressed air energy storage coupled wind power variable power tracking control method for a wind power storage station, where the wind power storage station includes a wind power system and a compressed air energy storage system, the wind power system is connected to a power grid system, and is further connected to the power grid system through the compressed air energy storage system, the method includes: detecting the system frequency of the power grid system, and calculating the frequency variation of the power grid system according to the system frequency; and controlling the output power of the wind power system according to the frequency variation, or controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system or discharge the electric energy to the power grid system so as to stabilize the system frequency.
According to the compressed air energy storage coupling wind power variable power tracking control method, in order to improve the stability of the frequency of a power grid system, when the frequency of the system is reduced, electric energy is transmitted to the power grid side by controlling the turbine unit of the compressed air energy storage system to discharge, so that the primary frequency adjustment of the system is realized. When the system frequency rises, on one hand, the compressor of the compressed air energy storage system is controlled to charge, the power on the power grid side is absorbed, and on the other hand, the fan is in a variable power point tracking control mode, and the output power of the fan unit is reduced by increasing the rotating speed of the rotor of the fan unit, so that the primary frequency adjusting capability of the wind power storage station under the full working condition is realized.
In addition, the compressed air energy storage coupling wind power variable power tracking control method provided by the embodiment of the invention can also have the following additional technical characteristics:
According to one embodiment of the invention, controlling the compressed air energy storage system to absorb or discharge electrical energy from or to the electrical grid system according to the frequency variation comprises: if the frequency variation is greater than 0, controlling the compressed air energy storage system to discharge to the power grid system according to the frequency variation; and if the frequency variation is smaller than or equal to 0, controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation.
According to one embodiment of the present invention, the controlling the output power of the wind power system according to the frequency variation includes: and when the frequency variation is greater than 0, controlling the rotating speed of a rotor of the wind turbine generator set in the wind power system according to the frequency variation so as to reduce the output power of the wind power system.
According to one embodiment of the invention, the controlling the discharging of the compressed air energy storage system to the grid system according to the frequency variation comprises: calculating the difference between the system frequency and the system rated frequency to obtain a first frequency variation; calculating to obtain the increased power of the power grid system according to the first frequency variation and the energy storage sagging coefficient; and determining target power generation power of a turbine in the compressed air energy storage system according to the increased power, and controlling the turbine to work at the target power generation power so as to discharge to the power grid system.
According to one embodiment of the present invention, the controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation includes: and controlling a compressor in the compressed air energy storage system to work at maximum power so as to absorb electric energy input by the wind power system to the power grid system.
According to one embodiment of the present invention, the controlling the rotational speed of the wind turbine rotor in the wind power system according to the frequency variation includes: calculating the difference between the system frequency and the system rated frequency to obtain a second frequency variation; calculating according to the second frequency variation and an active-frequency droop coefficient of the thermal power generating unit to obtain the reduced power of the power grid system; and calculating a power difference value between the reduced power and the maximum power, determining a target rotating speed of the rotor of the wind turbine according to the power difference value, and controlling the rotor of the wind turbine according to the target rotating speed.
According to one embodiment of the invention, a target rotational speed of the wind turbine rotor is determined from the power difference using a power-tachometer.
According to one embodiment of the invention, a variable power point tracking control mode is adopted to control the rotor of the wind turbine according to the target rotating speed.
According to one embodiment of the invention, the wind turbine adopts a doubly-fed wind turbine.
According to one embodiment of the invention, the compressed air energy storage system employs a compressed air energy storage system with two stages of compression and two stages of expansion.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a compressed air energy storage coupled wind power variable power tracking control method according to one embodiment of the invention;
FIG. 2 is a block diagram of compressed air energy storage coupled wind power variable power tracking primary frequency modulation control according to one embodiment of the invention;
FIG. 3 is a flow chart of controlling discharge of a compressed air energy storage system to a grid system in accordance with one embodiment of the present invention;
FIG. 4 is a power control block diagram of a compressed air energy storage system turbine according to one embodiment of the invention;
FIG. 5 is a power control block diagram of a compressed air energy storage system compressor according to one embodiment of the invention;
FIG. 6 is a flow chart of reducing the output power of a wind power system in accordance with one embodiment of the invention;
FIG. 7 is a schematic diagram of a wind turbine according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a compressed air energy storage system according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a method for tracking and controlling the power variation of the compressed air energy storage coupling wind power according to the embodiment of the present invention in detail with reference to fig. 1 to 8 of the specification and a specific implementation manner.
The compressed air energy storage coupling wind power variable power tracking control method is used for a wind power storage station, the wind power storage station comprises a wind power system and a compressed air energy storage system, the wind power system is connected with a power grid system, and the wind power system is also connected with the power grid system through the compressed air energy storage system.
Specifically, the wind power system in the wind power storage station is connected with the power grid system, and is also connected with the power grid system through the compressed air energy storage system. The compressed air energy storage system is connected with the wind power system and used for storing electric energy generated by the wind power system. The compressed air energy storage system provided by the embodiment of the invention is a non-afterburning advanced adiabatic compressed air energy storage system based on compression heat feedback, and has the advantages of high efficiency, environmental friendliness, no pollution and the like.
In the embodiment of the invention, a wind generating set of a wind power system mainly comprises a wind turbine, a gear box, a generator, a grid-side converter and a rotor-side converter, and the control of the wind power system comprises pitch angle control, machine side and grid-side converter control.
In the embodiment of the invention, the compressed air energy storage system comprises a compressor, a turbine, a heat exchanger, a heat storage tank, a gas storage reservoir, a motor and a synchronous generator, and the compressed air energy storage system controls a power control system comprising the compressor and the turbine.
FIG. 1 is a flow chart of a compressed air energy storage coupled wind power variable power tracking control method according to one embodiment of the invention. As shown in fig. 1, the compressed air energy storage coupling wind power variable power tracking control method may include:
s101, detecting the system frequency of a power grid system, and calculating the frequency variation of the power grid system according to the system frequency;
And S102, controlling the output power of the wind power system according to the frequency variation, or controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system or discharge the electric energy to the power grid system so as to stabilize the system frequency.
It should be noted that, sudden increase or sudden decrease of the power grid load may cause a change in the frequency of the power grid system, and stability of the frequency of the power grid system is critical to normal operation of the power grid system. If the frequency fluctuation is too large, damage to the power equipment will result, and even breakdown of the power system will be initiated.
In order to stabilize the frequency of the power grid system, the system frequency of the power grid system is detected, the frequency variation of the power grid system in preset time is calculated according to the detected system frequency, and the output power of the wind power system is adjusted according to the frequency variation, or the compressed air energy storage system is controlled to absorb the electric energy input by the wind power system to the power grid system or discharge the electric energy to the power grid system, so that the system frequency of the power grid system is stabilized.
Specifically, when the system frequency is reduced, the electric energy is transmitted to the power grid side by controlling the discharge of the compressed air energy storage system, so that the primary frequency modulation function of the system is realized. And if the system frequency is increased, the wind power system and the compressed air energy storage system are cooperatively controlled, on one hand, the power input to the power grid side by the wind power system is absorbed by controlling the charging of the compressed air energy storage system, and on the other hand, the wind power unit increases the rotating speed and reduces the power on the basis of the maximum power tracking mode, so that the variable power point tracking control is realized to carry out primary frequency adjustment.
It should be noted that, the preset time may be set according to actual requirements, and the embodiment of the present invention does not limit the preset time.
In one embodiment of the present invention, as shown in fig. 2, controlling the absorption or discharge of electric energy to or from the grid system of the compressed air energy storage system according to the frequency variation may include:
If the frequency variation is greater than 0, controlling the compressed air energy storage system to discharge to the power grid system according to the frequency variation;
And if the frequency variation is less than or equal to 0, controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation.
Specifically, the load connected with the power grid system suddenly increases, the system frequency f s is reduced due to the load suddenly increases, the frequency variation is larger than 0, and the wind power system is controlled in a maximum power point tracking (Maximum Power Point Tracking, MPPT) mode, so that the compressed air energy storage system is controlled to discharge to the power grid system according to the frequency variation, and the system frequency of the power grid system is stabilized. The load connected with the power grid system is suddenly reduced, the load suddenly reduced causes the system frequency f s to be increased, the frequency variation is smaller than or equal to 0, the compressed air energy storage system can be controlled to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation, and the output power of the wind power system can be regulated according to the frequency variation so as to stabilize the system frequency of the power grid system.
As an embodiment, as shown in fig. 3, controlling the discharge of the compressed air energy storage system to the grid system according to the frequency variation may include:
s201, calculating a difference value between the system frequency and the system rated frequency to obtain a first frequency variation;
S202, calculating to obtain the increased power of the power grid system according to the first frequency variation and the energy storage sagging coefficient;
and S203, determining target power generation power of the turbine in the compressed air energy storage system according to the increased power, and controlling the turbine to work at the target power generation power so as to discharge to the power grid system.
Specifically, when the frequency variation is greater than 0, a first frequency variation Δf 1 is calculated according to the system frequency f s and the system rated frequency f N, where Δf 1＝fN-fs. Because the wind turbine generator is in a maximum power tracking state, the turbine power generation of the compressed air energy storage system can be controlled to participate in system frequency adjustment. And calculating the increased power delta P 1 of the power grid system according to the first frequency variation delta f 1 and the energy storage sagging coefficient k p. In this embodiment Δp 1＝kp(fN-fs), where k p is the energy storage droop coefficient, f N is the system nominal frequency, and f s is the system frequency. And taking the increased power delta P 1 as the target power for generating the turbine in the compressed air energy storage system, and controlling the turbine to work at the target power for generating so as to discharge to the power grid system, so that the system frequency of the power grid system can be quickly stabilized.
In an embodiment of the present invention, the power control of the compressed air energy storage system turbine is shown in FIG. 4. The output power of the turbine power generation system is regulated by changing the inlet air mass flow of the turbine of the compressed air energy storage system through regulating a throttle valve. Wherein, P t,ref in fig. 4 represents the reference power of the expander, P t represents the output power value of the expander, T air,out is the outlet temperature of the air after passing through the heat exchanger, T air,in is the inlet temperature of the air before entering the heat exchanger, and T HTF,in is the inlet temperature of the heat-carrying working medium before entering the heat exchanger; τ TD and τ AV are the delay coefficients of the nozzle regulator and the expansion process, τ TP is the delay coefficient of the power sensor, and m t is the inlet air mass flow of the turbine.
As a specific embodiment, controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation may include:
and controlling a compressor in the compressed air energy storage system to work at the maximum power so as to absorb the electric energy input by the wind power system to the power grid system.
Specifically, when the frequency variation is less than or equal to 0, the compressor (motor) of the compressed air energy storage system is controlled to start. In order to quickly stabilize the system frequency of the power grid system, a motor in the compressed air energy storage system is controlled to work at the maximum power delta P c (full power), and the electric energy input to the power grid system by the wind power system is absorbed at the maximum power.
As a specific example, power control of an advanced compressed air energy storage system compressor is shown in FIG. 5, the mechanical power of the compressor may be adjusted by varying the inlet guide vane angle to control the compressor inlet air mass flow. The dynamics of the inlet guide vane angle control and the compression process of the compressor are approximately described by a first order inertia element, where P c,ref in fig. 5 represents the reference power of the compressor, P c represents the output power value of the compressor,For compressor inlet air temperature,/>Is the compressor outlet temperature; τ IGV and τ cd are IGV (Inlet guide vanes, inlet rotatable vane system) systems and compression processes such that the time delay coefficients; τ cp is the time delay coefficient of the power sensor, m c is the compressor inlet air mass flow, lmin and lmax are the compressor anti-blocking and surge phenomena, maximum and minimum intake air mass flow.
In one embodiment of the present invention, as shown in fig. 2, controlling output power of a wind power system according to a frequency variation includes:
and when the frequency variation is less than or equal to 0, controlling the rotating speed of the wind turbine generator system rotor according to the frequency variation so as to reduce the output power of the wind turbine generator system.
Specifically, when the frequency variation is smaller than or equal to 0, the output power of the wind power system can be reduced by controlling the rotating speed of the wind power system wind turbine generator system rotor, so that the system frequency of the power grid system can be further and rapidly stabilized.
In the embodiment of the present invention, P ref in fig. 2 represents the direct output power of the wind turbine (mainly the sum of the output power P w of the doubly-fed induction generator and the additional variable power point tracking control Δp w(kw Δf of the wind turbine under the MPPT control of the wind turbine), ω ref represents the rated rotation speed of the wind turbine, Δω=ω ref-ωr.
As a specific embodiment, as shown in fig. 6, controlling the rotation speed of the wind turbine rotor in the wind power system according to the frequency variation includes:
s301, calculating a difference value between the system frequency and the system rated frequency to obtain a second frequency variation;
S302, calculating according to the second frequency variation and the active-frequency droop coefficient of the thermal power generating unit to obtain the reduced power of the power grid system;
S303, calculating a power difference value between the reduced power and the maximum power, determining a target rotating speed of the rotor of the wind turbine generator according to the power difference value, and controlling the rotor of the wind turbine generator according to the target rotating speed.
Specifically, the second frequency variation Δf 2 is calculated according to the system frequency f s and the system rated frequency f N, where Δf 2＝fN-fs. And calculating the reduced power delta P 2 of the power grid system according to the second frequency variation delta f 2 and the active-frequency droop coefficient K' p of the thermal power generating unit. In this embodiment Δp 2＝-k′p(fN-fs), where-k' p is the thermal power plant active-frequency droop coefficient, f N is the system nominal frequency, and f s is the system frequency. And calculating the difference between the reduced power delta P 2 and the maximum power of the motor in the compressed air energy storage system to obtain a power difference. And determining the target rotating speed of the rotor of the wind turbine according to the power difference value, and controlling the rotor of the wind turbine according to the target rotating speed. The variable power point tracking control of the wind turbine is realized by increasing the rotating speed of the rotor of the wind turbine, the active power output of the wind turbine is reduced, and the compressed air energy storage and the wind turbine participate in primary frequency adjustment of the power grid together.
In one embodiment of the invention, a power-tachometer may be utilized to determine a target rotational speed of a wind turbine rotor from the power differential.
Specifically, according to the power difference value, a power-rotating speed meter is inquired, and the target rotating speed of the rotor of the wind turbine is obtained.
In the embodiment of the invention, in the primary frequency modulation power distribution process, the compressed air energy storage full power is preferentially absorbed, the wind turbine generator adopts a variable power point tracking control mode to reduce the active power of the wind turbine generator, and the droop coefficient k w of the wind turbine generator is as follows:
Wherein Δp 2 is the reduced power of the grid system, P c is the output power of the compressor in the compressed air energy storage system, f N is the system rated frequency, and f s is the system frequency.
Specifically, when the system load is reduced and the overall frequency of the power grid system is increased, the system frequency variation is detected through the power grid, the compressed air energy storage system is coordinated and controlled to absorb electric energy input by the wind power system to the power grid system, the rotation speed of the wind driven generator is increased to reduce power, so that the power balance of the system is maintained, and meanwhile, the sagging coefficient of variable power tracking of the fan is obtained, so that the system frequency adjustment is realized.
In one embodiment of the invention, a variable power point tracking control mode is adopted to control the rotor of the wind turbine according to the target rotating speed.
Specifically, the embodiment of the invention adopts a variable power point tracking control mode to control the wind turbine generator.
According to the compressed air energy storage coupling wind power variable power tracking control method, in order to improve the stability of the frequency of a power grid system, when the frequency of the system is reduced, the turbine unit of the compressed air energy storage system is controlled to discharge, electric energy is transmitted to the power grid side, and one-time frequency adjustment of the system is achieved. When the system frequency rises, on one hand, the compressor of the compressed air energy storage system is controlled to charge, the power input to the power grid side by the wind power system is absorbed, on the other hand, the fan is in a variable power point tracking control mode, the output power of the fan unit is reduced by increasing the rotating speed of the rotor of the fan unit, and the primary frequency adjustment capability of the wind power storage station under all working conditions is realized.
In the embodiment of the invention, when the system frequency is increased, the compressed air is preferentially stored for full power to absorb electric energy, and then the wind turbine generator is controlled to reduce active power by adopting variable power point tracking control. The wind power sagging coefficient is calculated by simulating the difference value between the power compensation quantity required by wind turbine frequency modulation and the power compensation quantity of the compressor of the compressed air energy storage system. According to the embodiment of the invention, the primary frequency modulation of the power grid system is participated in the variable power tracking cooperative control of the compressed air energy storage power station and the wind turbine generator, and the power distribution of the compressed air energy storage system and the wind turbine generator is cooperatively controlled, so that the maximum power generation benefit is realized.
In one embodiment of the invention, a doubly-fed wind turbine may be employed.
As a specific embodiment, as shown in fig. 7, the wind power system of the embodiment of the present invention includes a wind turbine, a gear box, a doubly-fed induction generator, a rotor-side converter and a grid-side converter, wherein the wind turbine is connected to an input end of the doubly-fed induction generator through the gear box, a first output end of the doubly-fed induction generator is connected to an input end of the rotor-side converter, a first output end of the rotor-side converter is connected to a first end of a first capacitor, a second output end of the rotor-side converter is connected to a second end of the first capacitor, a first end of the first capacitor is connected to a first input end of the grid-side converter, a second end of the first capacitor is connected to a second input end of the grid-side converter, an output end of the grid-side converter is connected to the transformer through an inductor, and a second output end of the doubly-fed induction generator is connected to the transformer.
The specific embodiment takes a wind power system adopting a doubly-fed wind turbine as an example, wherein the wind power system mainly comprises a wind turbine, a gear box, a doubly-fed induction generator (Doubly-fed Induction Generator, DFIG), a grid-side converter (GSC) and a rotor-side converter (RSC). According to the aerodynamic equation of the wind turbine, the mechanical power P m output by the wind power system can be obtained as follows:
Wherein ρ is air density, a is wind swept area, v is wind speed, λ is tip speed ratio, β is pitch angle, C pw is wind energy utilization coefficient, R is rotor blade radius, ω r is doubly fed induction generator rotor speed.
In the specific embodiment, the transmission model of the wind turbine generator is simplified to be as follows:
Wherein H wt is the total inertia time constant of the wind power system, P m is the mechanical power output by the wind power system, and P w is the output power of the doubly-fed induction generator.
The control part of the wind power system comprises pitch angle control, machine side and grid side converter control. In order to conveniently control the rotating speed of the doubly-fed induction generator, the doubly-fed induction generator is operated at the optimal rotating speed to achieve maximum power point tracking, and a rotor converter vector control model adopts a torque current double closed-loop control system to achieve control of the doubly-fed motor. And for reactive power control, a reactive power outer ring and a current inner ring control mode is adopted. The control objective of the grid-side converter is to keep the voltage of the direct current bus stable, and the grid-side converter adopts a double closed-loop control system of a direct current bus voltage outer ring and an alternating current side current inner ring. The DC bus voltage is used as an outer ring control target, the output of the voltage controller is used as the setting of the current inner ring, and the current controller controls the current at the AC side to quickly track the current command.
In one embodiment of the present invention, the compressed air energy storage system may employ a compressed air energy storage system with two stages of compression and two stages of expansion.
As a specific embodiment, as shown in fig. 8, the compressed air energy storage system of the embodiment of the invention comprises a motor, a compression subsystem, a gas storage subsystem, a turbine subsystem, a generator, a compression heat collecting subsystem and a compression heat feedback subsystem, wherein the compression subsystem comprises a low-pressure compressor (LP) and a high-pressure compressor (HP), the turbine subsystem comprises a high-pressure turbine (HT) and a low-pressure turbine (LT), the compression heat collecting subsystem comprises a first heat exchanger, a second heat exchanger, a high-temperature heat storage tank and a normal-temperature heat storage tank, the compression heat feedback subsystem comprises a regenerative heat exchanger and a third heat exchanger, wherein the output end of the motor is connected with the input end of the low-pressure compressor, the first output end of the low-pressure compressor is connected with the first input end of the high-pressure compressor, the second output end of the low-pressure compressor is connected with the first input end of the first heat exchanger, the first output end of the high-pressure heat exchanger is connected with the first input end of the high-pressure turbine, the first output end of the high-pressure heat exchanger is connected with the first input end of the high-pressure heat exchanger through the first three-way heat exchanger, the first output end of the high-pressure heat exchanger is connected with the first input end of the high-pressure heat exchanger through the first electromagnetic valve, the first three-way heat exchanger is connected with the first input end of the high-pressure heat exchanger, the first output end of the high-pressure heat exchanger is connected with the first input end of the high-pressure heat exchanger through the first output valve, and the high-pressure heat exchanger is connected with the first input end of the high heat exchanger, the third end of the first three-way valve is connected with the second input end of the second heat exchanger, the second output end of the first heat exchanger is connected with the first end of the second three-way valve, the second output end of the second heat exchanger is connected with the second end of the second three-way valve, the third end of the second three-way valve is connected with the input end of the high-temperature heat storage tank, the output end of the high-temperature heat storage tank is connected with the first end of the third three-way valve, the second end of the third three-way valve is connected with the second input end of the regenerative heat exchanger, the second output end of the third three-way valve is connected with the second input end of the third heat exchanger, and the third end of the third three-way valve is connected with the second end of the fourth three-way valve.
In this embodiment, taking a typical compressed air energy storage system structure with two-stage compression and two-stage expansion as an example, the compressed air energy storage system structure mainly comprises a compressor, a turbine, a heat exchanger, a heat storage tank (heat conduction oil tank), a gas storage (high-pressure air), a motor and a synchronous generator. The compression subsystem formed by the multistage compressor and the indirect cooling heat exchanger and the power generation subsystem formed by the multistage transmission and reheating heat exchangers are core components in the energy storage and release processes respectively, and the compression subsystem and the power generation subsystem formed by the multistage transmission and reheating heat exchangers are coupled through the heat storage tank and the air storage tank.
According to the compressed air energy storage coupling wind power variable power tracking control method, primary frequency adjustment control is completed by cooperative control of a compressed air energy storage system and a wind turbine generator. If the system frequency is reduced, the full-power charging of the compressed air energy storage system is controlled preferentially, the redundant energy output by the fan is absorbed, and meanwhile, the rotating speed of the wind turbine generator is controlled to realize variable power point tracking so as to reduce the output power. If the system frequency is increased, the compressed air energy storage system is controlled to discharge to meet the requirement of standby capacity supply during primary frequency modulation, so that the wind power storage station has primary frequency modulation capability under all working conditions. Meanwhile, a power distribution method of the compressed air energy storage system and the wind power system is provided, a droop coefficient of a variable power point tracking control of the fan is determined, and the frequency stability of the system is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. 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.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The utility model provides a compressed air energy storage coupling wind-powered electricity generation becomes power tracking control method, characterized in that is used for wind power storage power plant, wind power storage power plant includes wind power system and compressed air energy storage system, wind power system is connected with the electric wire netting system, still through compressed air energy storage system is connected with the electric wire netting system, the method includes:
detecting the system frequency of the power grid system, and calculating the frequency variation of the power grid system according to the system frequency;
And controlling the output power of the wind power system according to the frequency variation, or controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system or discharge the electric energy to the power grid system so as to stabilize the system frequency.
2. The compressed air energy storage coupled wind power variable power tracking control method of claim 1, wherein controlling the compressed air energy storage system to absorb or discharge electrical energy from or to the electrical grid system according to the frequency variation comprises:
if the frequency variation is greater than 0, controlling the compressed air energy storage system to discharge to the power grid system according to the frequency variation;
and if the frequency variation is smaller than or equal to 0, controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the power grid system according to the frequency variation.
3. The compressed air energy storage coupled wind power variable power tracking control method according to claim 2, wherein the controlling the output power of the wind power system according to the frequency variation comprises:
And when the frequency variation is smaller than or equal to 0, controlling the rotating speed of the wind turbine generator set rotor in the wind power system according to the frequency variation so as to reduce the output power of the wind power system.
4. The compressed air energy storage coupled wind power variable power tracking control method of claim 2, wherein the controlling the discharging of the compressed air energy storage system to the grid system according to the frequency variation comprises:
Calculating the difference between the system frequency and the system rated frequency to obtain a first frequency variation;
Calculating to obtain the increased power of the power grid system according to the first frequency variation and the energy storage sagging coefficient;
and determining target power generation power of a turbine in the compressed air energy storage system according to the increased power, and controlling the turbine to work at the target power generation power so as to discharge to the power grid system.
5. A compressed air energy storage coupled wind power variable power tracking control method according to claim 3, wherein the controlling the compressed air energy storage system to absorb the electric energy input by the wind power system to the grid system according to the frequency variation comprises:
and controlling a compressor in the compressed air energy storage system to work at maximum power so as to absorb electric energy input by the wind power system to the power grid system.
6. The method for controlling wind power variable power tracking by coupling compressed air energy storage according to claim 5, wherein the controlling the rotational speed of the wind turbine rotor according to the frequency variation comprises:
calculating the difference between the system frequency and the system rated frequency to obtain a second frequency variation;
calculating according to the second frequency variation and an active-frequency droop coefficient of the thermal power generating unit to obtain the reduced power of the power grid system;
And calculating a power difference value between the reduced power and the maximum power, determining a target rotating speed of the rotor of the wind turbine according to the power difference value, and controlling the rotor of the wind turbine according to the target rotating speed.
7. The compressed air energy storage coupled wind power variable power tracking control method according to claim 6, wherein a power-tachometer is utilized to determine a target rotational speed of the wind turbine rotor according to the power difference.
8. The compressed air energy storage coupling wind power variable power tracking control method of claim 6, wherein a variable power point tracking control mode is adopted to control the wind turbine rotor according to the target rotating speed.
9. The compressed air energy storage coupling wind power variable power tracking control method of claim 3, wherein the wind turbine is a doubly-fed wind turbine.
10. The compressed air energy storage coupled wind power variable power tracking control method of claim 1, wherein the compressed air energy storage system adopts a compressed air energy storage system with two stages of compression and two stages of expansion.
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