CN111934327A - Wind turbine generator primary frequency modulation and virtual inertia coordination control method and device - Google Patents

Wind turbine generator primary frequency modulation and virtual inertia coordination control method and device Download PDF

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Publication number
CN111934327A
CN111934327A CN202010619490.9A CN202010619490A CN111934327A CN 111934327 A CN111934327 A CN 111934327A CN 202010619490 A CN202010619490 A CN 202010619490A CN 111934327 A CN111934327 A CN 111934327A
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wind turbine
wind
power
frequency modulation
control
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田新首
迟永宁
李琰
刘超
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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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
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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]
    • 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
    • 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

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Abstract

The invention relates to a coordination control method and a device for primary frequency modulation and virtual inertia of a wind turbine generator, which comprises the following steps: determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of the power grid; determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant; correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant; adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine; according to the invention, a control strategy combining primary frequency modulation control and virtual inertia control is adopted for the wind turbine generator on the comprehensive wind power plant level, so that the frequency stability of a large-scale wind power grid-connected system can be improved.

Description

Wind turbine generator primary frequency modulation and virtual inertia coordination control method and device
Technical Field
The invention relates to the technical field of new energy power generation control, in particular to a primary frequency modulation and virtual inertia coordination control method and device for a wind turbine generator.
Background
The rotating speed of the wind turbine generator is decoupled from the system frequency, and when the wind turbine generator normally operates in a maximum power tracking control state, the wind turbine generator cannot respond to the frequency change of a power grid, the rotating kinetic energy of the wind turbine generator is hidden, the power grid cannot be helped to reduce the frequency change rate of the system, and the wind turbine generator also does not have primary frequency modulation capability, so that the frequency stability of a large-scale wind power grid-connected system is reduced.
The wind turbine generator set can participate in system frequency modulation by utilizing the self-rotation kinetic energy of the wind turbine generator set, and the design of additional frequency response control enables the wind turbine generator set to have virtual inertia and primary frequency modulation capacity. The coupling characteristic among the large-scale wind turbines is outstanding, and the coupling characteristic has a non-negligible influence when the new energy power generation responds to the frequency change of a system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method and a device for coordinating and controlling primary frequency modulation and virtual inertia of a wind turbine generator, which realize the frequency response of the wind turbine generator by coordinating and controlling the fast virtual inertia and the slow primary frequency modulation on the wind power plant level and the wind power plant level, and accurately improve the stability of a power grid system.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a wind turbine generator primary frequency modulation and virtual inertia coordinated control method, which is improved in that the method comprises the following steps:
determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of the power grid;
determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant;
correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
Preferably, the determining the additional power controlled by the primary frequency modulation of the wind farm and the additional power controlled by the virtual inertia of each wind turbine generator in the wind farm according to the grid frequency includes:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure BDA0002562540330000021
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Preferably, the determining the power reference value and the pitch angle control value of each wind turbine in the wind farm according to the additional power of the primary frequency modulation control of the wind farm includes:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
Further, the determining of the power standby coefficient of the primary frequency modulation control of each wind turbine in the wind farm based on the additional power of the primary frequency modulation control of the wind farm includes:
correcting the additional power of the primary frequency modulation control of the wind power plant according to the following formula:
Figure BDA0002562540330000022
in the formula, delta P is the additional power of the primary frequency modulation control of the wind power plant, delta P' is the additional power of the corrected primary frequency modulation control of the wind power plant, and delta PmaxMaximum limit value of additional power, delta P, for primary frequency modulation control of wind farmsminA minimum limit value of the additional power for primary frequency modulation control of the wind power plant;
based on the delta P', determining a power instruction value of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000031
in the formula, PEfiA power instruction value P for primary frequency modulation control of the ith wind turbine generatorEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]N is the total number of wind turbine generators in the wind power plant;
determining the power reserve coefficient of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000032
in the formula, kfiPower reserve factor, k, for primary frequency modulation control of the ith wind turbineoiIs the power reserve coefficient, P, of the ith wind turbine generator before primary frequency modulation controlEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Further, the modifying the pitch angle standard value corresponding to the power backup coefficient of the primary frequency modulation control of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator includes:
determining a pitch angle control value beta of the ith wind turbine generator according to the following formularef,i：
βref,i＝βi,0+βi
In the formula, betai,0A pitch angle standard value beta corresponding to a power reserve coefficient controlled by the primary frequency modulation of the ith wind turbine generatoriFor the pitch angle reference value of the ith wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Preferably, the modifying the power reference value of each wind turbine in the wind farm by using the additional power controlled by the virtual inertia of each wind turbine in the wind farm to obtain the power control value of each wind turbine in the wind farm includes:
determining the power control value P of the ith wind turbine generator according to the following formularef,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Based on the same invention concept, the invention also provides a wind turbine generator primary frequency modulation and virtual inertia coordination control device, and the improvement is that the wind turbine generator primary frequency modulation and virtual inertia coordination control device comprises:
the first determining unit is used for determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the power grid frequency;
the second determining unit is used for determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant;
the third determining unit is used for correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and the control unit is used for adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
Preferably, the first determining unit is specifically configured to:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure BDA0002562540330000041
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Preferably, the second determining unit is specifically configured to:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
Preferably, the third determining unit is specifically configured to:
determining the power control value P of the ith wind turbine generator according to the following formularef,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention relates to a primary frequency modulation control method and a primary frequency modulation control device for a wind turbine generator, wherein the method comprises the following steps: determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of the power grid; determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant; correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant; adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine; according to the invention, a control strategy combining primary frequency modulation control and virtual inertia control is adopted for the wind turbine generator, so that the frequency stability of a large-scale wind power grid-connected system can be improved.
In the primary frequency modulation link, the primary frequency modulation control power of each wind turbine is obtained by integrating the wind power plant level and the wind turbine level, the overall response capability of the wind power plant is considered, the stability of a power grid system is improved, the power of all the turbines in the wind power plant before frequency modulation is considered, the interaction among the turbines is considered, and the influence of the coupling among the turbines on the frequency response of the wind power plant participating in the power grid is reduced;
in the virtual inertia link, the rotating speed and the rotating speed constraint of the rotor of each unit are considered, the accuracy of the virtual inertia link is improved, and the locking is performed when the rotating speed of the rotor is too low so as to prevent the rotating speed of the fan from exceeding the limit.
Drawings
FIG. 1 is a flow chart of a primary frequency modulation and virtual inertia coordination control method of the present invention;
fig. 2 is a schematic diagram of a primary frequency modulation and virtual inertia coordination control device according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a coordination control method for primary frequency modulation and virtual inertia of a wind turbine generator, as shown in fig. 1, comprising the following steps:
s1, determining additional power of primary frequency modulation control of a wind power plant and additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of a power grid;
s2, determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of primary frequency modulation control of the wind power plant;
s3, correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and S4, adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
In order to more clearly illustrate the objects of the present invention, the following embodiments are further described.
In an embodiment of the present invention, in step s1, determining the additional power for primary frequency modulation control of the wind farm and the additional power for virtual inertia control of each wind turbine in the wind farm according to the power grid frequency includes:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure BDA0002562540330000061
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to[1,N]And N is the total number of wind generating sets in the wind power plant.
In an embodiment of the present invention, in step s2, determining a power reference value and a pitch angle control value of each wind turbine in the wind farm according to the additional power of the primary frequency modulation control of the wind farm includes:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
Specifically, the determining of the power standby coefficient of the primary frequency modulation control of each wind turbine in the wind farm based on the additional power of the primary frequency modulation control of the wind farm includes:
correcting the additional power of the primary frequency modulation control of the wind power plant according to the following formula:
Figure BDA0002562540330000071
in the formula, delta P is the additional power of the primary frequency modulation control of the wind power plant, delta P' is the additional power of the corrected primary frequency modulation control of the wind power plant, and delta PmaxMaximum limit value of additional power, delta P, for primary frequency modulation control of wind farmsminA minimum limit value of the additional power for primary frequency modulation control of the wind power plant;
based on the delta P', determining a power instruction value of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000072
in the formula, PEfiA power instruction value P for primary frequency modulation control of the ith wind turbine generatorEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]N is the total number of wind turbine generators in the wind power plant;
determining the power reserve coefficient of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000073
in the formula, kfiPower reserve factor, k, for primary frequency modulation control of the ith wind turbineoiIs the power reserve coefficient, P, of the ith wind turbine generator before primary frequency modulation controlEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Wherein, the correcting the pitch angle standard value corresponding to the power backup coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator includes:
determining a pitch angle control value beta of the ith wind turbine generator according to the following formularef,i：
βref,i＝βi,0+βi
In the formula, betai,0A pitch angle standard value beta corresponding to a power reserve coefficient controlled by the primary frequency modulation of the ith wind turbine generatoriFor the pitch angle reference value of the ith wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
In an embodiment of the present invention, in step s3, the correcting the power reference value of each wind turbine in the wind farm by using the additional power controlled by the virtual inertia of each wind turbine in the wind farm to obtain the power control value of each wind turbine in the wind farm includes:
is as followsDetermining power control value P of ith wind turbine generatorref,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Based on the same inventive concept, the invention further provides a wind turbine generator primary frequency modulation and virtual inertia coordination control device, as shown in fig. 2, comprising:
the first determining unit is used for determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the power grid frequency;
the second determining unit is used for determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant;
the third determining unit is used for correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and the control unit is used for adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
Preferably, the first determining unit is specifically configured to:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure BDA0002562540330000091
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Preferably, the second determining unit is specifically configured to:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
Specifically, the determining of the power standby coefficient of the primary frequency modulation control of each wind turbine in the wind farm based on the additional power of the primary frequency modulation control of the wind farm includes:
correcting the additional power of the primary frequency modulation control of the wind power plant according to the following formula:
Figure BDA0002562540330000092
in the formula, delta P is the additional power of the primary frequency modulation control of the wind power plant, delta P' is the additional power of the corrected primary frequency modulation control of the wind power plant, and delta PmaxMaximum limit value of additional power, delta P, for primary frequency modulation control of wind farmsminA minimum limit value of the additional power for primary frequency modulation control of the wind power plant;
based on the delta P', determining a power instruction value of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000093
in the formula, PEfiA power instruction value P for primary frequency modulation control of the ith wind turbine generatorEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]N is the total number of wind turbine generators in the wind power plant;
determining the power reserve coefficient of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure BDA0002562540330000101
in the formula, kfiPower reserve factor, k, for primary frequency modulation control of the ith wind turbineoiIs the power reserve coefficient, P, of the ith wind turbine generator before primary frequency modulation controlEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Wherein, the correcting the pitch angle standard value corresponding to the power backup coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator includes:
determining a pitch angle control value beta of the ith wind turbine generator according to the following formularef,i：
βref,i＝βi,0+βi
In the formula, betai,0A pitch angle standard value beta corresponding to a power reserve coefficient controlled by the primary frequency modulation of the ith wind turbine generatoriFor the pitch angle reference value of the ith wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
Preferably, the third determining unit is specifically configured to:
determining the power control value P of the ith wind turbine generator according to the following formularef,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
In summary, the present invention relates to a primary frequency modulation control method and device for a wind turbine, including: determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of the power grid; determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant; correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant; adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine; according to the invention, a control strategy combining primary frequency modulation control and virtual inertia control is adopted for the wind turbine generator, so that the frequency stability of a large-scale wind power grid-connected system can be improved.
In the primary frequency modulation link, the primary frequency modulation control power of each wind turbine is obtained by integrating the wind power plant level and the wind turbine level, the overall response capability of the wind power plant is considered, the stability of a power grid system is improved, the power of all the turbines in the wind power plant before frequency modulation is considered, the interaction among the turbines is considered, and the influence of the coupling among the turbines on the frequency response of the wind power plant participating in the power grid is reduced;
in the virtual inertia link, the rotating speed and the rotating speed constraint of the rotor of each unit are considered, the accuracy of the virtual inertia link is improved, and the locking is performed when the rotating speed of the rotor is too low so as to prevent the rotating speed of the fan from exceeding the limit.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (10)

1. A primary frequency modulation and virtual inertia coordination control method for a wind turbine generator is characterized by comprising the following steps:
determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the frequency of the power grid;
determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant;
correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
2. The method of claim 1, wherein determining the additional power for primary frequency modulation control of the wind farm and the additional power for virtual inertia control of each wind turbine in the wind farm based on the grid frequency comprises:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure FDA0002562540320000011
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
3. The method of claim 1, wherein determining a power reference value and a pitch angle control value for each wind turbine in the wind farm from the additional power for the wind farm primary frequency modulation control comprises:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
4. The method of claim 3, wherein determining the power reserve factor for each wind turbine primary frequency modulation control in the wind farm based on the additional power for the wind farm primary frequency modulation control comprises:
correcting the additional power of the primary frequency modulation control of the wind power plant according to the following formula:
Figure FDA0002562540320000021
in the formula, delta P is the additional power of the primary frequency modulation control of the wind power plant, delta P' is the additional power of the corrected primary frequency modulation control of the wind power plant, and delta PmaxMaximum limit value of additional power, delta P, for primary frequency modulation control of wind farmsminA minimum limit value of the additional power for primary frequency modulation control of the wind power plant;
based on the delta P', determining a power instruction value of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure FDA0002562540320000022
in the formula, PEfiA power instruction value P for primary frequency modulation control of the ith wind turbine generatorEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]N is the total number of wind turbine generators in the wind power plant;
determining the power reserve coefficient of primary frequency modulation control of each wind turbine in the wind power plant according to the following formula:
Figure FDA0002562540320000023
in the formula, kfiPower reserve factor, k, for primary frequency modulation control of the ith wind turbineoiIs the power reserve coefficient, P, of the ith wind turbine generator before primary frequency modulation controlEoiFor the power of the ith wind turbine generator before primary frequency modulation control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
5. The method according to claim 3, wherein the correcting the pitch angle standard value corresponding to the power backup coefficient of the primary frequency modulation control of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator comprises:
determining a pitch angle control value beta of the ith wind turbine generator according to the following formularef,i：
βref,i＝βi,0+βi
In the formula, betai,0A pitch angle standard value beta corresponding to a power reserve coefficient controlled by the primary frequency modulation of the ith wind turbine generatoriFor the pitch angle reference value of the ith wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
6. The method of claim 1, wherein the step of correcting the power reference value of each wind turbine in the wind farm by using the additional power controlled by the virtual inertia of each wind turbine in the wind farm to obtain the power control value of each wind turbine in the wind farm comprises the steps of:
determining the power control value P of the ith wind turbine generator according to the following formularef,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
7. The utility model provides a wind turbine generator system primary control and virtual inertia coordinated control device which characterized in that includes:
the first determining unit is used for determining the additional power of primary frequency modulation control of the wind power plant and the additional power of virtual inertia control of each wind turbine generator in the wind power plant according to the power grid frequency;
the second determining unit is used for determining a power reference value and a pitch angle control value of each wind turbine in the wind power plant according to the additional power of the primary frequency modulation control of the wind power plant;
the third determining unit is used for correcting the power reference value of each wind turbine in the wind power plant by using the additional power controlled by the virtual inertia of each wind turbine in the wind power plant to obtain the power control value of each wind turbine in the wind power plant;
and the control unit is used for adjusting the pitch angle and the power of each wind turbine in the wind power plant according to the pitch angle control value of each wind turbine in the wind power plant and the power control value of each wind turbine.
8. The apparatus of claim 7, wherein the first determining unit is specifically configured to:
determining the additional power delta P of the primary frequency modulation control of the wind power plant according to the following formula:
ΔP＝K(fref-f-fΔ)
wherein f is the grid frequency, K is the proportionality coefficient, frefIs a reference frequency, fΔIs a grid frequency dead zone.
Determining the additional power controlled by the virtual inertia of each wind turbine generator according to the following formula:
Figure FDA0002562540320000031
in the formula,. DELTA.Pf,iAdditional power for the control of the virtual inertia of the ith wind turbine generator, K' is a differential coefficient, omegaiIs the rotation speed of the ith wind turbine generator, d is a differential sign, t is a control moment, omegaminIs the minimum limit value, omega, of the rotational speed of the wind turbinemaxIs the maximum limit value of the rotating speed of the wind turbine generator, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
9. The apparatus of claim 7, wherein the second determining unit is specifically configured to:
determining a power standby coefficient of primary frequency modulation control of each wind turbine in the wind power plant based on the additional power of the primary frequency modulation control of the wind power plant;
acquiring a pitch angle standard value and a rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine;
respectively inputting the pitch angle standard value and the rotating speed standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator into two PI controllers to obtain a power reference value and a pitch angle reference value of each wind turbine generator;
and correcting the pitch angle standard value corresponding to the power standby coefficient controlled by the primary frequency modulation of each wind turbine generator by using the pitch angle reference value of each wind turbine generator to obtain the pitch angle control value of each wind turbine generator.
10. The method of claim 7, wherein the third determination unit is specifically configured to:
determining the power control value P of the ith wind turbine generator according to the following formularef,i：
Pref,i＝Pi,0+ΔPi
In the formula, Pi,0Is the power reference value, delta P, of the ith wind turbineiAdditional power for the ith wind turbine generator virtual inertia control, i belongs to [1, N ∈]And N is the total number of wind generating sets in the wind power plant.
CN202010619490.9A 2020-06-30 2020-06-30 Wind turbine generator primary frequency modulation and virtual inertia coordination control method and device Pending CN111934327A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113794210A (en) * 2021-08-27 2021-12-14 深圳市禾望电气股份有限公司 Primary frequency modulation and inertia response coordination control method for new energy station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113794210A (en) * 2021-08-27 2021-12-14 深圳市禾望电气股份有限公司 Primary frequency modulation and inertia response coordination control method for new energy station
CN113794210B (en) * 2021-08-27 2023-06-16 深圳市禾望电气股份有限公司 Primary frequency modulation and inertia response coordination control method for new energy station

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