CN114221395A - Primary frequency modulation and virtual inertia control method for wind power station - Google Patents
Primary frequency modulation and virtual inertia control method for wind power station Download PDFInfo
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- CN114221395A CN114221395A CN202111511195.2A CN202111511195A CN114221395A CN 114221395 A CN114221395 A CN 114221395A CN 202111511195 A CN202111511195 A CN 202111511195A CN 114221395 A CN114221395 A CN 114221395A
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- power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention relates to a primary frequency modulation and virtual inertia control method for a wind power station, wherein the wind power station is connected with an energy storage facility, and the method comprises the following steps: acquiring voltage, current and power grid frequency at a grid connection point of a wind power plant station in real time; and judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a rotor kinetic energy control frequency change rate threshold value, if so, controlling the wind turbine generator set by using a rotor kinetic energy control mode, if not, judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a power standby control frequency change rate threshold value, if so, controlling the wind turbine generator set by using the power standby control mode, and if not, controlling the energy storage facility to output the compensation power by using the power compensation control mode. The method can improve the frequency quick response capability of the wind power station provided with the energy storage facility.
Description
Technical Field
The invention relates to the field of primary frequency modulation and virtual inertia response control of a wind power station, in particular to a primary frequency modulation and virtual inertia control method for the wind power station.
Background
The configuration of energy storage is an ideal way for realizing active power and frequency control of the new energy station, and compared with control ways which need to sacrifice maximum power tracking of the unit in the frequency response period such as pitch angle control and rotating speed control, the loss of electric quantity of new energy can be avoided.
In the aspect of a fast frequency Control technology of a new energy station, a document Control for the Provision of Virtual Inertia by Wind Turbines with PMSG linking Wind structures provides a Virtual Inertia Control technology, which supports frequency modulation by enabling a fan to release rotor kinetic energy. However, after the rotor of the fan is decelerated, the rotor absorbs active power and recovers to the original rotating speed due to the action of the maximum power tracking module, and secondary falling of frequency is easily caused. Aiming at the problem, the active rotating speed protection control strategy of the doubly-fed wind turbine generator set considering the inertia frequency modulation is added with a rotor rotating speed protection module on the basis of inertia control to prevent the rotating speed from exceeding the limit and inhibit the secondary drop of the frequency; according to the novel wind power plant virtual inertia cooperative control strategy, rotor kinetic energy evaluation factors are introduced to quantify the frequency modulation capability of each unit, each unit is coordinately controlled to participate in system frequency modulation according to the frequency modulation capability of each unit, and secondary falling of the system frequency is avoided. Under the influence of the fluctuation of the wind speed, the running state of the fan is easy to change, and the frequency modulation capability of the fan cannot be fully exerted by the droop control of the fixed parameters. Aiming at the problem, the literature proposes to set droop control parameters in different modes according to the operation of a fan in low, medium and high wind speed regions based on a variable droop coefficient control strategy of a double-fed wind turbine generator; according to the Primary frequency adjustment by delayed wind turbines using variable droop drop, a variable droop control strategy is combined with load shedding control, so that the difference of wind generating sets participating in system frequency modulation under different wind speeds is well coordinated; in order to enable the fan to have certain power storage at high wind speed, the frequency control strategy of the variable-speed constant-frequency double-fed wind turbine generator is improved by utilizing variable-pitch control, a certain pitch angle is reserved in advance to reduce the output of the fan, active standby participation system frequency modulation is reserved, the pitch angle of the fan can be controlled to realize load shedding under most working conditions, and therefore the adjusting range is wide. The document combines an overspeed standby and inertia simulating double-fed fan frequency control strategy to combine overspeed control and rotor kinetic energy control, and simultaneously improves the inertia response capability and the primary frequency modulation capability of the system. In the aspect of a rapid frequency control technology of an energy storage system, a wind power plant virtual inertia compensation strategy based on the energy storage technology is disclosed, and a fuzzy logic control strategy is applied to control the energy storage system to realize frequency support of a wind power system.
In summary, the new energy unit has a certain frequency response capability, but the control technologies are various and the coordination is complex. In view of the current basic development situation of large-scale new energy access to a power grid in China and relative shortage of relevant research of a rapid frequency control technology of matching of a current new energy station and stored energy, a control mode of configuring the stored energy new energy station to participate in rapid frequency response needs to be researched.
Disclosure of Invention
The invention aims to provide a primary frequency modulation and virtual inertia control method for a wind power station, so as to improve the frequency quick response capability of the wind power station provided with an energy storage facility.
The technical scheme of the invention is as follows:
a primary frequency modulation and virtual inertia control method for a wind power station is provided, wherein the wind power station is connected with an energy storage facility, and the method comprises the following steps:
acquiring voltage, current and power grid frequency at the grid-connected point of the wind power plant station in real time;
judging whether the frequency change rate corresponding to the power grid frequency is smaller than or equal to a rotor kinetic energy control frequency change rate threshold value or not, if the frequency change rate corresponding to the power grid frequency is smaller than or equal to the rotor kinetic energy control frequency change rate threshold value, controlling the wind turbine generator set by using a rotor kinetic energy control mode, if the frequency change rate corresponding to the power grid frequency is larger than the rotor kinetic energy control frequency change rate threshold value, judging whether the frequency change rate corresponding to the power grid frequency is smaller than or equal to a power standby control frequency change rate threshold value or not, if the frequency change rate corresponding to the power grid frequency is smaller than or equal to the power standby control frequency change rate threshold value, controlling the wind turbine generator set by using a power standby control mode, and if the frequency change rate corresponding to the power grid frequency is larger than the power standby control frequency change rate threshold value, controlling the energy storage facility to output compensation power by using a power compensation control mode.
Preferably, the rotor kinetic energy control mode includes virtual inertia control and droop control.
Further preferably, the virtual inertia control is to introduce an active reference signal related to the frequency change rate in the active control part of the wind turbine, so that the wind turbine output can respond to the frequency change.
Further preferably, the droop control is to introduce a variation value in proportion to the frequency deviation on the active reference value, so as to realize active frequency deviation proportional control of the fan.
Preferably, the power standby control mode comprises wind motor overspeed control and wind motor pitch control.
Preferably, the wind turbine overspeed control is to reduce the rotation speed of the fan according to the MPPT curve of the fan output, so that the operating point moves left to approach the optimal operating point.
Preferably, the variable pitch control of the wind motor is based on an inverse relationship between a rotating speed and a timing power of the wind motor and a pitch angle, and the output power of the wind motor is close to the optimal power by reducing the pitch angle.
The invention has the beneficial effects that:
1. by comparing the frequency change rate corresponding to the power grid frequency with the rotor kinetic energy control frequency change rate threshold value and the power reserve control frequency change rate threshold value, a proper control mode is selected to control the wind turbine generator, so that the power grid frequency at the grid-connected point of the wind power station is stabilized, and the power grid frequency fluctuation is reduced.
Detailed Description
The following examples are presented to illustrate the present invention and to assist those skilled in the art in understanding and practicing the present invention. The following examples and technical terms therein should not be construed to depart from the background of the technical knowledge in the technical field unless otherwise indicated.
The station-matched energy storage of the new energy field can improve the inertia of the whole system. Assuming that the mechanical power of the synchronous generator remains unchanged, under the condition that a per-unit system can be obtained according to a motion equation of a rotor of the synchronous generator, the inertia constant of the generator is as follows:
the average generalized inertia constant over a small time Δ t (the system frequency change rate does not change sign) can be obtained from the above equation as:
considering from the unit angle, the participation of the new energy station in the active support control of the power grid is mostly an active control link in the improved unit, so that the active output of the improved unit can respond to the frequency change of the system in real time.
A primary frequency modulation and virtual inertia control method for a wind power station is characterized in that the wind power station is connected with an energy storage facility, a plurality of groups of wind turbine generators are arranged in the wind power station, and the method comprises the following steps:
acquiring voltage, current and power grid frequency at the grid-connected point of the wind power plant station in real time;
judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a rotor kinetic energy control frequency change rate threshold value or not, if the frequency change rate corresponding to the power grid frequency is less than or equal to the rotor kinetic energy control frequency change rate threshold value, controlling the wind turbine generator by using a rotor kinetic energy control mode, and if the frequency change rate corresponding to the power grid frequency is greater than the rotor kinetic energy control frequency change rate threshold value;
and judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a power standby control frequency change rate threshold value, if so, controlling the wind turbine generator set by using a power standby control mode, and if the frequency change rate corresponding to the power grid frequency is greater than the power standby control frequency change rate threshold value, controlling the energy storage facility to output compensation power by using a power compensation control mode.
Wherein the rotor kinetic energy control mode comprises virtual inertia control and droop control. The virtual inertia control is to introduce an active reference signal related to the frequency change rate in the active control part of the fan, so that the output of the fan can respond to the frequency change. Droop control is a change value which is in direct proportion to frequency deviation and introduced to an active reference value, and therefore active frequency deviation proportion control of the fan is achieved.
The power standby control mode comprises wind motor overspeed control and wind motor variable pitch control. The wind motor overspeed control is to reduce the rotating speed of the fan according to the MPPT curve of the fan output, so that the working point is moved left to be close to the optimal operating point. The variable pitch control of the wind motor is that the output power of the wind motor is close to the optimal power by reducing the pitch angle according to the inverse relation between the rotating speed and the power of the wind motor at a certain time and the pitch angle. The overspeed control response is rapid, the application range of the variable pitch control is wide, the advantages of all parties can be fully exerted by realizing the coordination control of the overspeed control and the variable pitch control, and therefore the active supporting capability of the wind turbine generator is effectively improved.
The present invention is described in detail with reference to the examples. It should be understood that in practice the description of all possible embodiments is not exhaustive and that the inventive concepts are described herein as far as possible by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should make experimental changes to the technical features and specific parameters of the above embodiments, or make routine replacements to the technical means disclosed by the present invention by using the prior art in the technical field, so as to form specific embodiments, which are all the contents of the disclosure.
Claims (7)
1. A primary frequency modulation and virtual inertia control method for a wind power station is characterized by comprising the following steps of:
receiving instruction information sent by an automatic power generation control system, and acquiring voltage, current and power grid frequency at a grid-connected point of the wind power plant in real time;
judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a rotor kinetic energy control frequency change rate threshold value,
if the frequency change rate corresponding to the power grid frequency is less than or equal to the rotor kinetic energy control frequency change rate threshold value, the wind turbine generator is controlled by using a rotor kinetic energy control mode,
if the frequency change rate corresponding to the power grid frequency is larger than the threshold value of the rotor kinetic energy control frequency change rate;
judging whether the frequency change rate corresponding to the power grid frequency is less than or equal to a power standby control frequency change rate threshold value,
if the frequency change rate corresponding to the power grid frequency is less than or equal to the power standby control frequency change rate threshold value, the wind turbine generator is controlled by using a power standby control mode,
and if the frequency change rate corresponding to the power grid frequency is larger than the power standby control frequency change rate threshold value, controlling the energy storage facility to output compensation power by using a power compensation control mode.
2. The primary frequency modulation and virtual inertia control method for a wind farm as set forth in claim 1, wherein the rotor kinetic energy control mode includes virtual inertia control and droop control.
3. A primary frequency modulation and virtual inertia control method for a wind farm according to claim 2, wherein the virtual inertia control is to introduce an active reference signal related to the frequency change rate in the active control part of the wind turbine, so that the wind turbine output can respond to the frequency change.
4. A primary frequency modulation and virtual inertia control method for a wind power plant as claimed in claim 2, wherein the droop control is to introduce a variation value proportional to the frequency deviation on the active reference value, thereby implementing the active frequency deviation proportional control of the wind turbine.
5. The primary frequency modulation and virtual inertia control method for a wind farm station of claim 1, wherein the power backup control modes include wind turbine overspeed control and wind turbine pitch control.
6. The primary frequency modulation and virtual inertia control method for a wind farm according to claim 5, wherein the wind turbine overspeed is controlled by lowering the rotational speed of the wind turbine based on the MPPT curve of the wind turbine output, so that the operating point moves left closer to the optimal operating point.
7. A primary frequency modulation and virtual inertia control method for a wind farm according to claim 5, wherein the wind turbine is controlled to pitch according to the inverse ratio between the rotational speed, the timing, the wind turbine power and the pitch angle, and the wind turbine output power is brought close to the optimal power by reducing the pitch angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111511195.2A CN114221395A (en) | 2021-12-03 | 2021-12-03 | Primary frequency modulation and virtual inertia control method for wind power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111511195.2A CN114221395A (en) | 2021-12-03 | 2021-12-03 | Primary frequency modulation and virtual inertia control method for wind power station |
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| CN114221395A true CN114221395A (en) | 2022-03-22 |
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| CN202111511195.2A Pending CN114221395A (en) | 2021-12-03 | 2021-12-03 | Primary frequency modulation and virtual inertia control method for wind power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114884086A (en) * | 2022-04-24 | 2022-08-09 | 上海发电设备成套设计研究院有限责任公司 | Control method, device and equipment based on wind storage system and storage medium |
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2021
- 2021-12-03 CN CN202111511195.2A patent/CN114221395A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114884086A (en) * | 2022-04-24 | 2022-08-09 | 上海发电设备成套设计研究院有限责任公司 | Control method, device and equipment based on wind storage system and storage medium |
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