CN111082472B - Method and system for controlling regulation of wind turbine generator inverter based on V-f cross - Google Patents

Method and system for controlling regulation of wind turbine generator inverter based on V-f cross Download PDF

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CN111082472B
CN111082472B CN201911227453.7A CN201911227453A CN111082472B CN 111082472 B CN111082472 B CN 111082472B CN 201911227453 A CN201911227453 A CN 201911227453A CN 111082472 B CN111082472 B CN 111082472B
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wind turbine
inverter
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link
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CN111082472A (en
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于钊
孙华东
贺静波
何飞
金一丁
张健
李文锋
艾东平
王官宏
陶向宇
王晖
贾媛
魏巍
李莹
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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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
    • H02J3/38—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
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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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  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a method and a system for controlling regulation of a wind turbine inverter based on V-f cross, and belongs to the technical field of power systems. The method comprises the following steps: acquiring inner ring current control link parameters of a wind turbine generator inverter, and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine generator inverter; and determining the root mean square value of the reactive current reference value and the active current reference value, if the root mean square value does not meet the preset condition, determining the dynamically distributed reactive current value and reactive current value, and performing cross control adjustment on the wind turbine set inverter by using the reactive current value and the reactive current value. The invention ensures that the wind turbine generator inverter can effectively participate in the voltage control and frequency control of the system.

Description

Method and system for controlling regulation of wind turbine generator inverter based on V-f cross
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a system for controlling regulation of a wind turbine inverter based on V-f crossing.
Background
Under the condition that large-scale renewable energy penetrates into an electric power system, the frequency regulation and the voltage regulation of the electric power system are still undertaken by a conventional synchronous machine set, meanwhile, the problems of system frequency and voltage are more prominent due to the intermittence, fluctuation and incomplete controllability of the renewable energy, and the overvoltage problem caused by direct-current commutation failure occurs in a large renewable energy base sent out by extra-high voltage direct current, so that the renewable energy machine set is necessary to participate in the system frequency regulation and the voltage regulation in order to ensure the safe and stable operation of the electric power system. The wind turbine generator participates in the frequency adjustment of the power system and is influenced by uncontrollable wind power, the power adjusted upwards is limited to a certain limit value, and the wind turbine generator also participates in the frequency adjustment of the system through methods such as energy storage or output pressure configuration. The main limiting factor for the wind turbine generator to participate in voltage regulation of the power system is the input power of the wind turbine generator array, the adjustable reactive power of the wind turbine generator inverter cannot reach the rated power under the limitation of apparent power and rated current, but the advantage of the wind turbine generator inverter participating in voltage regulation of the system is that the reactive power of the wind turbine generator inverter is not influenced by external factors such as weather and the like, and stable reactive support can be provided under the condition of no illumination.
When the wind turbine generator inverter simultaneously participates in frequency regulation and voltage regulation of a power system (for example, when a large renewable energy base is sent out through extra-high voltage direct current, unipolar locking and commutation failure occur, bidirectional problems of voltage and frequency are caused, and in a conventional alternating current power grid, the voltage problem and the frequency problem are usually twinned), the situation that the adjustable capacity cannot simultaneously meet the regulation requirements of active power and reactive power may occur, and under the condition that the adjustable capacity is insufficient, how to reasonably distribute the active power and the reactive power of the wind turbine generator inverter is a problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the regulation of a wind turbine generator inverter based on V-f cross, which comprises the following steps:
acquiring inner ring current control link parameters of a wind turbine generator inverter, and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine generator inverter;
and determining the root mean square value of the reactive current reference value and the active current reference value, if the root mean square value does not meet the preset condition, determining the dynamically distributed reactive current value and reactive current value, and performing cross control adjustment on the wind turbine set inverter by using the reactive current value and the reactive current value.
Optionally, the inner-loop control link includes: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
Optionally, the preset condition specifically includes:
I min ≤I' ref ≤I max (1)
wherein, I' ref Is the root mean square value, I, of the reactive current reference value and the active current reference value min Minimum current limit and I for inverter max Is the maximum current limit of the inverter.
Optionally, the determination of the dynamically allocated reactive current value and the reactive current value specifically includes:
obtaining the cross distribution angle according to the following formula
Figure BDA0002302636290000021
Figure BDA0002302636290000022
According to cross distribution angle
Figure BDA0002302636290000023
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure BDA0002302636290000024
Figure BDA0002302636290000025
determining the active current value I after cross distribution according to alpha and beta dref And a value of reactive current I qref The formula is determined as follows:
ΔI dref ＝αΔI max (5)
ΔI qref ＝βΔI max (6)
wherein Δ I max And the current increment in the same direction is initially not limited by the wind turbine inverter.
Optionally,. DELTA.I max Satisfies the following conditions:
Figure BDA0002302636290000031
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N The rated current of the wind turbine inverter.
Optionally, the method further comprises: an additional V-f control link is added in an inner loop current control link of the wind turbine generator inverter.
The invention also provides a system for controlling the regulation of the wind turbine generator inverter based on V-f cross, which comprises the following steps:
the parameter acquisition module is used for acquiring inner ring current control link parameters of the wind turbine inverter and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine inverter;
and the second control module is used for determining the root-mean-square value of the reactive current reference value and the active current reference value, determining the reactive current value and the reactive current value which are dynamically distributed if the root-mean-square value does not meet the preset condition, and performing cross control adjustment on the wind turbine set inverter by using the reactive current value and the reactive current value.
Optionally, the inner-loop control link includes: the method comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
Optionally, the preset condition specifically includes:
I min ≤I' ref ≤I max
wherein, I' ref Root mean square value, I, of reactive current reference value and active current reference value min Is the minimum current limit and I of the inverter max Is the maximum current limit of the inverter.
Optionally, the determination of the dynamically allocated reactive current value and the reactive current value specifically includes:
the cross distribution angle is obtained according to the following formula
Figure BDA0002302636290000032
Figure BDA0002302636290000033
According to cross distribution angle
Figure BDA0002302636290000034
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure BDA0002302636290000041
Figure BDA0002302636290000042
determining the active current value I after cross distribution according to alpha and beta dref And a value of reactive current I qref The formula is determined as follows:
ΔI dref ＝αΔI max
ΔI qref ＝βΔI max
wherein Δ I max And the current increment in the same direction is initially not limited by the wind turbine inverter.
Optionally,. DELTA.I max Satisfies the following conditions:
Figure BDA0002302636290000043
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N The rated current of the wind turbine inverter.
Optionally, the system further comprises:
the first control module is used for controlling an inner ring current control link of the wind turbine generator inverter and adding an additional voltage-frequency V-f control link;
according to the invention, the active current and reactive current reference values of the wind turbine inverter are dynamically adjusted in the active and reactive control links of the wind turbine inverter, so that the active power and reactive power are reasonably distributed in the V-f cross control link, and the wind turbine inverter can effectively participate in the voltage control and frequency control of the system.
Drawings
FIG. 1 is a flow chart of a method for controlling regulation of a wind turbine inverter based on V-f crossover according to the present invention;
FIG. 2 is a structural diagram of an inner loop control link of a method for controlling regulation of a wind turbine generator inverter based on V-f intersection;
FIG. 3 is a schematic diagram of reactive current values and reactive current values dynamically distributed by a method for controlling the regulation of a wind turbine inverter based on V-f crossing according to the invention;
FIG. 4 is a frequency disturbance test result diagram of the method for controlling the regulation of the wind turbine inverter based on V-f cross;
FIG. 5 is a voltage disturbance test result diagram of a method for controlling the regulation of a wind turbine generator inverter based on V-f crossing according to the invention;
FIG. 6 is a system diagram for controlling regulation of a wind turbine inverter based on V-f crossover according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for controlling the regulation of a wind turbine inverter based on V-f cross, which comprises the following steps as shown in figure 1:
adding an additional V-f control link in an inner loop current control link of the wind turbine generator inverter;
acquiring inner ring current control link parameters of a wind turbine generator inverter, and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine generator inverter;
and determining the root mean square value of the reactive current reference value and the active current reference value, if the root mean square value does not meet the preset condition, determining the reactive current value and the reactive current value which are dynamically distributed, and performing cross control adjustment on the wind turbine set inverter by using the reactive current value and the reactive current value.
The inner ring control link, the structure of which is shown in fig. 2, includes: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
The preset conditions are specifically as follows:
I min ≤I' ref ≤I max (1)
wherein, I' ref Is the root mean square value, I, of the reactive current reference value and the active current reference value min Is the minimum current limit and I of the inverter max Is the maximum current limit of the inverter.
The principle of the determination of the dynamically allocated reactive current value and the reactive current value is shown in fig. 3, and specifically includes:
the cross distribution angle is obtained according to the following formula
Figure BDA0002302636290000061
Figure BDA0002302636290000062
According to cross distribution angle
Figure BDA0002302636290000063
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure BDA0002302636290000064
Figure BDA0002302636290000065
determining the active current value I after cross distribution according to alpha and beta dref And a value of reactive current I qref The formula is determined as follows:
ΔI dref ＝αΔI max (5)
ΔI qref ＝βΔI max (6)
wherein Δ I max The same direction current increment is the wind turbine inverter which is not limited initially, and is the same as the AC shown in FIG. 2.
ΔI max Satisfies the following conditions:
Figure BDA0002302636290000066
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N The rated current is the rated current of the wind turbine inverter.
The frequency perturbation test result determined by the method of the invention is shown in fig. 4, and the voltage perturbation test result is shown in fig. 5.
The invention further provides a system 200 for controlling the regulation of the wind turbine inverter based on V-f crossing, as shown in fig. 6, comprising:
the first control module 201 controls an inner loop current control link of the wind turbine inverter and adds an additional V-f control link;
the parameter acquisition module 202 is used for acquiring parameters of an inner ring current control link of the wind turbine generator inverter and determining a reactive current reference value and an active current reference value according to the parameters of the inner ring current control link of the wind turbine generator inverter;
and the second control module 203 determines the root mean square value of the reactive current reference value and the active current reference value, determines the dynamically distributed reactive current value and reactive current value if the root mean square value does not meet the preset condition, and performs cross control adjustment on the wind turbine generator inverter by using the reactive current value and the reactive current value.
The inner ring control link comprises: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
The preset conditions are specifically as follows:
I min ≤I' ref ≤I max
wherein, I' ref Is the root mean square value, I, of the reactive current reference value and the active current reference value min Is the minimum current limit and I of the inverter max Is the maximum current limit of the inverter.
The determination of the dynamically distributed reactive current value and the reactive current value specifically comprises the following steps:
the cross distribution angle is obtained according to the following formula
Figure BDA0002302636290000071
Figure BDA0002302636290000072
According to cross distribution angle
Figure BDA0002302636290000073
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure BDA0002302636290000074
Figure BDA0002302636290000075
determining the active current value I after cross distribution according to alpha and beta dref And a value of reactive current I qref The formula is determined as follows:
ΔI dref ＝αΔI max
ΔI qref ＝βΔI max
wherein Δ I max And the current increment in the same direction is initially not limited by the wind turbine inverter.
ΔI max Satisfies the following conditions:
Figure BDA0002302636290000076
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N The rated current is the rated current of the wind turbine inverter.
According to the invention, the reference values of the active current and the reactive current of the wind turbine inverter are dynamically adjusted in the active and reactive control links of the wind turbine inverter, so that the active power and the reactive power are reasonably distributed in the V-f cross control link, and the wind turbine inverter is ensured to effectively participate in the voltage control and the frequency control of the system.
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 so forth) 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 (8)

1. A method for controlling wind turbine generator inverter regulation based on V-f crossover, the method comprising:
acquiring inner ring current control link parameters of a wind turbine generator inverter, and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine generator inverter;
determining a reactive current reference value and a root mean square value of the active current reference value, if the root mean square value does not meet a preset condition, determining a dynamically distributed active current value and a dynamically distributed reactive current value, and performing cross control adjustment on the wind turbine generator inverter by using the active current value and the reactive current value;
the determining of the active current value and the reactive current value of the dynamic allocation specifically includes:
the cross distribution angle is obtained according to the following formula
Figure FDA0003675100600000011
Figure FDA0003675100600000012
According to cross distribution angle
Figure FDA0003675100600000013
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure FDA0003675100600000014
Figure FDA0003675100600000015
determining the active current value I after cross distribution according to alpha and beta dref And a reactive current value Iqref, the determination formula is as follows:
ΔI dref ＝αΔI max (5)
ΔI qref ＝βΔI max (6)
wherein Δ I max The method comprises the steps of obtaining the current increment in the same direction without amplitude limiting for the wind turbine generator inverter initially;
the Δ I max Satisfies the following conditions:
Figure FDA0003675100600000016
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N The rated current of the wind turbine inverter.
2. The method of claim 1, the inner loop current control link comprising: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
3. The method according to claim 1, wherein the preset condition is specifically:
I min ≤I’ ref ≤I max (1)
wherein, I' ref Is the root mean square value, I, of the reactive current reference value and the active current reference value min Minimum current limit and I for inverter max Is the maximum current limit of the inverter.
4. The method of claim 1, further comprising: an additional V-f control link is added in an inner loop current control link of the wind turbine generator inverter.
5. A system for controlling wind turbine inverter regulation based on a V-f crossover, the system comprising:
the parameter acquisition module is used for acquiring inner ring current control link parameters of the wind turbine inverter and determining a reactive current reference value and an active current reference value according to the inner ring current control link parameters of the wind turbine inverter;
the second control module is used for determining a reactive current reference value and a root mean square value of an active current reference value, determining a dynamically distributed active current value and a dynamically distributed reactive current value if the root mean square value does not meet the minimum and maximum current limits of the wind turbine inverter, and performing cross control adjustment on the wind turbine inverter by using the active current value and the reactive current value;
the determining of the active current value and the reactive current value of the dynamic allocation specifically includes:
the cross distribution angle is obtained according to the following formula
Figure FDA0003675100600000021
Figure FDA0003675100600000022
According to cross distribution angle
Figure FDA0003675100600000023
Determining an active current cross distribution factor alpha and a reactive current cross distribution factor beta:
Figure FDA0003675100600000024
Figure FDA0003675100600000025
determining the active current value I after cross distribution according to alpha and beta dref And a value of reactive current I qref The formula is determined as follows:
ΔI dref ＝αΔI max
ΔI qref ＝βΔI max
wherein Δ I max The method comprises the steps of obtaining the current increment in the same direction without amplitude limiting for the wind turbine generator inverter initially;
the described Δ I max Satisfies the following conditions:
Figure FDA0003675100600000031
wherein, I 0 Initial current of the wind turbine inverter, k is margin coefficient and I N For wind-power generation unitsRated current of the inverter.
6. The system of claim 5, the inner loop current control link comprising: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
7. The system of claim 5, wherein the minimum and maximum current limits of the wind turbine inverter are specifically:
I min ≤I’ ref ≤I max
wherein, I' ref Is the root mean square value, I, of the reactive current reference value and the active current reference value min Is the minimum current limit and I of the inverter max Is the maximum current limit of the inverter.
8. The system of claim 5, further comprising:
the first control module controls an inner ring current control link of the wind turbine generator inverter and adds an additional voltage-frequency V-f control link.
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