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CN110970919A - Control method and system for closed-loop regulation of terminal voltage of wind turbine generator - Google Patents

Control method and system for closed-loop regulation of terminal voltage of wind turbine generator Download PDF

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Publication number
CN110970919A
CN110970919A CN201911070710.0A CN201911070710A CN110970919A CN 110970919 A CN110970919 A CN 110970919A CN 201911070710 A CN201911070710 A CN 201911070710A CN 110970919 A CN110970919 A CN 110970919A
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wind turbine
voltage
link
turbine generator
inverter
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CN110970919B (en
Inventor
于钊
孙华东
金一丁
何飞
贺静波
李文锋
张健
魏巍
陶向宇
李莹
王官宏
王晖
贾媛
艾东平
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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
    • H02J3/38—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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

本发明公开了一种针对风电机组机端电压闭环调节的控制方法及系统，所述方法包括：在风电机组逆变器的电流控制环节，串联基于快速电压响应控制环节的电压闭环调节环节；所述电压闭环调节环节包括：调差环节，延时环节，死区环节，第一串联校正环节，第二串联校正环节，放大环节和限幅环节，通过所述电压闭环调节环节对所述风电机组逆变器的无功电流参考值进行计算，并确定所述电压闭环调节环节的补偿系数；根据所述电压闭环调节环节的补偿系数，调节所述无功电流在各风电机组之间的分配，避免各风电机组之间抢无功或无功环流现象的发生。

Figure 201911070710

The invention discloses a control method and system for closed-loop regulation of wind turbine generator terminal voltage. The method includes: connecting a voltage closed-loop regulation link based on a fast voltage response control link in series in a current control link of a wind turbine inverter; The voltage closed-loop adjustment link includes: a differential adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limit link. The reactive current reference value of the inverter is calculated, and the compensation coefficient of the voltage closed-loop adjustment link is determined; according to the compensation coefficient of the voltage closed-loop adjustment link, the distribution of the reactive current among the wind turbines is adjusted, Avoid the occurrence of reactive power or reactive power circulation between wind turbines.

Figure 201911070710

Description

Control method and system for closed-loop regulation of terminal voltage of wind turbine generator
Technical Field
The invention relates to the technical field of power systems, in particular to a control method and a control system for closed-loop regulation of terminal voltage of a wind turbine generator.
Background
With the gradual exploitation and completion of global fossil energy, the approaching supply of global fossil energy and the aggravation of greenhouse climate, all countries in the world recognize the importance of renewable energy, especially the development of wind power and photovoltaic, and pay high attention to the development of wind power, so that the global wind power industry is rapidly developed. Since the nineties of the last century, the annual growth rate of the installed capacity of wind power in the world is kept above 25%, and wind power generation becomes the fastest growing renewable energy in the world. China develops wind power rapidly. Since 2012, the wind power grid-connected capacity of China exceeds the United states, and the wind power grid-connected capacity becomes the first wind power major country in the world. By the end of 2018, the installed capacity of the wind power integration is higher than 18400 kilo-kilowatts, and the total annual generated energy is higher than 3660 hundred million kilowatts, which accounts for 5.2% of the total annual generated energy, and is improved by 0.4 percentage point compared with 2017, and is increased by 20% on the same scale. Due to policy support, cost reduction, technology maturity and capital influx, the installed capacity and annual energy production of wind power generation keep rapidly increasing, and the clean alternative effect of renewable energy sources is increasingly obvious.
The access of a large number of wind turbines to the power grid brings a series of significant influences on the safety and stability of the power system: random variations in power due to wind changes; short-circuit current characteristics and active and reactive change characteristics in the system fault process; a steady state reactive power control characteristic; the influence of the original conventional power supply on the transient state, the dynamic state and the medium-long term stability of the power system is replaced after the large-scale wind power is accessed into the system. At present, the problem of voltage stability caused by direct current commutation failure exists in a possible energy base sent out by high-voltage direct current, and how to stabilize a parallel wind turbine generator set to provide reactive support during voltage fluctuation becomes a problem which is urgently needed to be solved by large-scale wind power grid connection at present.
At present, the national standard only requires that a wind turbine generator generates certain reactive current when low voltage passes through, and does not require that the wind turbine generator participates in voltage closed-loop regulation when in steady-state operation, the wind turbine generator participates in closed-loop voltage regulation, and reactive current is robbed by a plurality of wind turbine generators when additional control is not added, so that a positive effect on system voltage is avoided, even local voltage is possibly too high or too low, the wind turbine generator is protected, meanwhile, box transformer substation also consumes a part of reactive power, and the reactive current compensation effect of the wind turbine generator is reduced.
Therefore, a technique is needed to implement a fast voltage response control technique for wind turbine generator terminal voltage closed-loop regulation.
Disclosure of Invention
The technical scheme of the invention provides a quick voltage response control method and a quick voltage response control system aiming at wind turbine generator terminal voltage closed-loop regulation, so as to solve the problem of quick voltage response control aiming at wind turbine generator terminal voltage closed-loop regulation.
In order to solve the above problem, the present invention provides a fast voltage response control method for wind turbine generator terminal voltage closed-loop regulation, wherein the method comprises:
a voltage closed loop regulation link based on a quick voltage response control link is connected in series in a current control link of the wind turbine generator inverter;
the voltage closed loop regulation link comprises: a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link, wherein a reactive current reference value of the wind turbine generator inverter is calculated through the voltage closed-loop adjustment link, and a compensation coefficient of the voltage closed-loop adjustment link is determined;
and adjusting the distribution of the reactive current among the wind generation sets according to the compensation coefficient of the voltage closed loop adjusting link, so as to avoid the occurrence of reactive power robbing or reactive circulation among the wind generation sets.
Preferably, the difference adjusting step comprises:
Figure BDA0002260838420000021
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure BDA0002260838420000022
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
Preferably, the delay element includes:
Figure BDA0002260838420000031
wherein S is a complex frequencyRate, TrIs a time constant of the delay link.
Preferably, the upper limit I of the reactive current reference value of the clipping elementqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure BDA0002260838420000032
Figure BDA0002260838420000033
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INThe rated current of the ith wind turbine generator set inverter.
Preferably, the determining a compensation coefficient of the voltage closed-loop regulating element further includes:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure BDA0002260838420000034
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the assumption is made that all physical quantities flowing through the box-type transformer are invertedRated value of the transformer, natural compensation factor delta of box transformer connected with ith wind power generator seti1The calculation method comprises the following steps:
Figure BDA0002260838420000041
Figure BDA0002260838420000042
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure BDA0002260838420000043
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure BDA0002260838420000044
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure BDA0002260838420000045
for a per unit value of reactive power flowing through the high voltage side of the box transformer,
Figure BDA0002260838420000046
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure BDA0002260838420000047
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure BDA0002260838420000048
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure BDA0002260838420000049
setting no compensation factor angle for ith wind turbine generator setAnd the same additional compensation reactance and additional compensation factor angle realize the reasonable distribution of reactive current among the wind turbine generators.
Preferably, when the voltage deviation reference value of the grid-connected point exceeds the dead zone, the smaller the setting value of the compensation coefficient is, the larger the reference value of the reactive current distributed by the wind turbine generator is.
Preferably, the compensation coefficient setting principle of each wind turbine generator is that the larger the reactive adjustable range is, the smaller the compensation coefficient is, and the following is:
Figure BDA00022608384200000410
Figure BDA00022608384200000411
wherein, ItqimaxThe maximum value of the reactive current at the inverter terminal of the wind turbine generator and the compensation coefficient deltaiA number close to zero or close to infinity is set.
Based on another aspect of the present invention, a fast voltage response control system for wind turbine generator terminal voltage closed-loop regulation is provided, the system includes:
the initial unit is used for connecting a voltage closed loop regulation link based on a quick voltage response control link in series in a current control link of the wind turbine generator inverter;
the determining unit is used for the voltage closed-loop regulating link and comprises: a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link, wherein a reactive current reference value of the wind turbine generator inverter is calculated through the voltage closed-loop adjustment link, and a compensation coefficient of the voltage closed-loop adjustment link is determined;
and the adjusting unit is used for adjusting the distribution of the reactive current among the wind generation sets according to the compensation coefficient of the voltage closed loop adjusting link, so that the phenomenon of reactive power robbing or reactive circulation among the wind generation sets is avoided.
Preferably, the difference adjusting step comprises:
Figure BDA0002260838420000051
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure BDA0002260838420000052
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
Preferably, the delay element includes:
Figure BDA0002260838420000053
where S is the complex frequency, TrIs a time constant of the delay link.
Preferably, the upper limit I of the reactive current reference value of the clipping elementqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure BDA0002260838420000054
Figure BDA0002260838420000055
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INThe rated current of the ith wind turbine generator set inverter.
Preferably, the determining a compensation coefficient of the voltage closed-loop regulating element further includes:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1For natural compensation of box transformer connected to ith wind turbine generator system inverterCoefficient, δi2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure BDA0002260838420000061
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method comprises the following steps:
Figure BDA0002260838420000062
Figure BDA0002260838420000063
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure BDA0002260838420000064
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure BDA0002260838420000065
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure BDA0002260838420000066
for a per unit value of reactive power flowing through the high voltage side of the box transformer,
Figure BDA0002260838420000067
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure BDA0002260838420000068
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure BDA0002260838420000069
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure BDA00022608384200000610
and for the additional compensation factor angle of the ith wind turbine generator, setting different additional compensation reactances and additional compensation factor angles for each wind turbine generator, thereby realizing the reasonable distribution of reactive current among the wind turbine generators.
Preferably, when the voltage deviation reference value of the grid-connected point exceeds the dead zone, the smaller the setting value of the compensation coefficient is, the larger the reference value of the reactive current distributed by the wind turbine generator is.
Preferably, the compensation coefficient setting principle of each wind turbine generator is that the larger the reactive adjustable range is, the smaller the compensation coefficient is, and the following is:
Figure BDA00022608384200000611
Figure BDA00022608384200000612
wherein, ItqimaxA compensation system for the maximum value of the reactive current at the inverter end of the wind turbine generator
Number deltaiA number close to zero or close to infinity is set.
The technical scheme of the invention provides a quick voltage response control method aiming at closed-loop regulation of generator terminal voltage of a wind turbine generator, which comprises the following steps: a voltage closed loop regulation link based on a quick voltage response control link is connected in series in a current control link of the wind turbine generator inverter; the voltage closed loop regulation link comprises: a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link, wherein a reactive current reference value of the wind turbine generator inverter is calculated through a voltage closed-loop adjustment link, and a compensation coefficient of the voltage closed-loop adjustment link is determined; according to the compensation coefficient of the voltage closed-loop regulation link, the distribution of reactive current among the wind generation sets is regulated, and the phenomenon of reactive power robbing or reactive circulation among the wind generation sets is avoided. According to the technical scheme, the rapid voltage response control link is connected in series in the reactive power regulation link of the wind generation set, and the reactive power compensation coefficient is dynamically regulated according to the adjustable capacity of the inverter, so that the reactive current of each wind generation set is distributed, the reactive circulation among the wind generation sets is restrained, the reactive power consumed by a compensation box transformer substation is reduced, and the voltage stability of the operation of the wind power plant is improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a fast voltage response control method for wind turbine generator terminal voltage closed loop regulation according to a preferred embodiment of the present invention;
FIG. 2 is a diagram of an exemplary wind farm access grid architecture system architecture in accordance with a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a wind turbine inverter reactive current reference calculation according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a reactive current reference value upper and lower limit determination method according to a preferred embodiment of the present invention;
FIG. 5 is an equivalent circuit schematic of a box transformer according to a preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of a voltage-reactive current curve of a grid-connected point after a fast voltage response control link is added in voltage closed loop regulation according to a preferred embodiment of the present invention; and
fig. 7 is a structural diagram of a fast voltage response control system for wind turbine generator terminal voltage closed-loop regulation according to a preferred embodiment of 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. Further, 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 meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a fast voltage response control method for wind turbine generator terminal voltage closed-loop regulation according to a preferred embodiment of the present invention. As shown in fig. 1, a fast voltage response control method for wind turbine generator terminal voltage closed-loop regulation includes:
preferably, in step 101: a voltage closed loop regulation link based on a quick voltage response control link is connected in series in a current control link of the wind turbine generator inverter;
preferably, at step 102: the voltage closed loop regulation link comprises: a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link, wherein a reactive current reference value of the wind turbine generator inverter is calculated through a voltage closed-loop adjustment link, and a compensation coefficient of the voltage closed-loop adjustment link is determined;
preferably, in step 103: according to the compensation coefficient of the voltage closed-loop regulation link, the distribution of reactive current among the wind generation sets is regulated, and the phenomenon of reactive power robbing or reactive circulation among the wind generation sets is avoided.
Preferably, the difference adjusting step comprises:
Figure BDA0002260838420000081
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure BDA0002260838420000082
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
Preferably, the delay element comprises:
Figure BDA0002260838420000091
where S is the complex frequency, TrIs a time constant of the delay link.
Preferably, the upper limit I of the reactive current reference value of the clipping elementqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure BDA0002260838420000092
Figure BDA0002260838420000093
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INThe rated current of the ith wind turbine generator set inverter.
Preferably, determining a compensation coefficient of the voltage closed-loop regulation element further includes:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure BDA0002260838420000094
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method comprises the following steps:
Figure BDA0002260838420000101
Figure BDA0002260838420000102
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure BDA0002260838420000103
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure BDA0002260838420000104
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure BDA0002260838420000105
to flow through the box type transformerThe per unit value of the reactive power of the high-voltage side of the transformer,
Figure BDA0002260838420000106
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure BDA0002260838420000107
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure BDA0002260838420000108
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure BDA0002260838420000109
and for the additional compensation factor angle of the ith wind turbine generator, setting different additional compensation reactances and additional compensation factor angles for each wind turbine generator, thereby realizing the reasonable distribution of reactive current among the wind turbine generators.
Preferably, when the voltage deviation reference value of the grid-connected point exceeds the dead zone, the smaller the setting value of the compensation coefficient is, the larger the reference value of the reactive current distributed by the wind turbine generator is.
Preferably, the compensation coefficient setting principle of each wind turbine generator is that the larger the reactive adjustable range is, the smaller the compensation coefficient is, and the following is:
Figure BDA00022608384200001010
Figure BDA00022608384200001011
wherein, ItqimaxThe maximum value of the reactive current at the inverter terminal of the wind turbine generator and the compensation coefficient deltaiA number close to zero or close to infinity is set.
The following exemplifies embodiments of the present application:
(1) and a voltage closed loop regulation link based on a quick voltage response control link is connected in series in a q-axis current control link of the wind turbine generator inverter. As shown in fig. 2.
(2) A fast voltage response control method for wind turbine generator terminal voltage closed-loop regulation comprises a fast voltage response control link, a delay link, a dead zone link, a first series correction link, a second series correction link and an amplification link, as shown in FIG. 3, wherein V istFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure BDA00022608384200001012
for adding compensation factor angle, UcFor the compensated grid-connected point voltage T of the wind turbine inverter1And T2Respectively, the time constant, T, of the first series correction element3And T4Respectively, the time constant of the second series correction element, K is the DC gain of the series correction element, KvSelection of a factor, K, for the integral correction elementvWhen 0 is the pure integral correction, KvWhen 1, K is a proportional integral correctionaFor amplification element gain, Ta is amplification element time constant, IqimaxAnd IqiminRespectively the upper and lower limits of the reactive current reference value.
(3) Upper and lower limits of reactive current reference value IqimaxAnd IqiminThe determination method is as shown in fig. 4, and it is assumed that the current instantaneous active current of the ith wind turbine generator is IdtiThen the upper and lower limit of reactive current IqimaxAnd IqiminDetermined by formula (1) and formula (2);
Figure BDA0002260838420000111
Figure BDA0002260838420000112
(4) wind turbine boxThe equivalent circuit of the transformer is shown in FIG. 5, where RTAnd XTEquivalent resistance and reactance, G, of the high-voltage side of the box-type transformerTAnd BTRespectively, the equivalent conductance and the equivalent susceptance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively the active power and the reactive power flowing through the high-voltage side of the box-type transformer.
(5) The method for calculating the compensation coefficient of the voltage closed-loop regulation link of the ith wind turbine generator inverter comprises the following steps
δi＝δi1+δi2(3)
Wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2And adding a compensation coefficient for the ith wind turbine generator set inverter.
(6) For the wind turbine generator, the voltage drop calculation formula of the box type transformer is as follows
Figure BDA0002260838420000113
(7) When the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method is
Figure BDA0002260838420000114
(8) The additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage response control link comprises the following steps
Figure BDA0002260838420000115
Wherein, XciFor additional compensating reactance of the ith wind turbines,
Figure BDA0002260838420000116
for additional compensation factor angle of ith wind turbineAnd by setting different additional compensation reactances and additional compensation factor angles for each wind turbine, the reactive current can be reasonably distributed among the wind turbines.
(9) When the voltage deviation reference value of the grid-connected point exceeds the dead zone, the reference value of the reactive current distributed to the wind turbines with different compensation coefficients is as shown in fig. 6, and the smaller the setting value of the compensation coefficient is, the larger the reference value of the reactive current distributed to the wind turbines is.
(10) In order to realize the reasonable distribution of reactive current among the wind turbines and avoid the generation of reactive power robbing or reactive circulation phenomenon, the compensation coefficient of each wind turbine needs to meet the condition that
δi＞0 (7)
(11) The principle of setting the compensation coefficient of each wind turbine generator is that the larger the reactive adjustable range is, the smaller the compensation coefficient is, and
Figure BDA0002260838420000121
Figure BDA0002260838420000122
but in the actual setting deltaiThe number of the first and second electrodes can be set to be close to zero or a larger number.
According to the embodiment of the application, the quick voltage response control link is connected in series in the reactive power regulation link of the wind generation set, and the reactive power compensation coefficient is dynamically regulated according to the adjustable capacity of the inverter, so that the reactive current of each wind generation set is distributed, meanwhile, the reactive circulation between the wind generation sets is restrained, the reactive power consumed by the compensation box is changed, and the voltage stability of the operation of the wind power plant is improved.
Fig. 7 is a structural diagram of a fast voltage response control system for wind turbine generator terminal voltage closed-loop regulation according to a preferred embodiment of the present invention. As shown in fig. 7, a fast voltage response control system for wind turbine generator terminal voltage closed-loop regulation includes:
the initial unit 701 is used for connecting a voltage closed loop regulation link based on a quick voltage response control link in series in a current control link of the wind turbine generator inverter.
The determining unit 702 is configured to perform a voltage closed-loop regulation procedure including: the method comprises a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link, wherein a reactive current reference value of a wind turbine generator inverter is calculated through a voltage closed-loop regulation link, and a compensation coefficient of the voltage closed-loop regulation link is determined.
And the adjusting unit 703 is configured to adjust the distribution of reactive current among the wind turbine generators according to the compensation coefficient of the voltage closed-loop adjusting link, so as to avoid the occurrence of reactive power robbing or reactive circulation among the wind turbine generators.
Preferably, the difference adjusting step comprises:
Figure BDA0002260838420000131
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure BDA0002260838420000132
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
Preferably, the delay element comprises:
Figure BDA0002260838420000133
where S is the complex frequency, TrIs a time constant of the delay link.
Preferably, the upper limit I of the reactive current reference value of the clipping elementqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure BDA0002260838420000134
Figure BDA0002260838420000135
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INThe rated current of the ith wind turbine generator set inverter.
Preferably, determining a compensation coefficient of the voltage closed-loop regulation element further includes:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure BDA0002260838420000136
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method comprises the following steps:
Figure BDA0002260838420000141
Figure BDA0002260838420000142
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure BDA0002260838420000143
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure BDA0002260838420000144
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure BDA0002260838420000145
for a per unit value of reactive power flowing through the high voltage side of the box transformer,
Figure BDA0002260838420000146
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure BDA0002260838420000147
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure BDA0002260838420000148
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure BDA0002260838420000149
and for the additional compensation factor angle of the ith wind turbine generator, setting different additional compensation reactances and additional compensation factor angles for each wind turbine generator, thereby realizing the reasonable distribution of reactive current among the wind turbine generators.
Preferably, when the voltage deviation reference value of the grid-connected point exceeds the dead zone, the smaller the setting value of the compensation coefficient is, the larger the reference value of the reactive current distributed by the wind turbine generator is.
Preferably, the compensation coefficient setting principle of each wind turbine generator is that the larger the reactive adjustable range is, the smaller the compensation coefficient is, and the following is:
Figure BDA00022608384200001410
Figure BDA00022608384200001411
wherein, ItqimaxThe maximum value of the reactive current at the inverter terminal of the wind turbine generator and the compensation coefficient deltaiA number close to zero or close to infinity is set.
A fast voltage response control system 700 for wind turbine generator terminal voltage closed-loop regulation according to a preferred embodiment of the present invention corresponds to the fast voltage response control method 100 for wind turbine generator terminal voltage closed-loop regulation according to another preferred embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (16)

1. A control method for closed-loop regulation of generator-end voltage of a wind turbine generator is characterized by comprising the following steps:
a voltage closed loop regulation link based on a quick voltage response control link is connected in series in a current control link of the wind turbine generator inverter;
calculating a reactive current reference value of the wind turbine generator inverter through the voltage closed-loop regulation link, and determining a compensation coefficient of the voltage closed-loop regulation link;
and adjusting the distribution of the reactive current among the wind generation sets according to the compensation coefficient of the voltage closed loop adjusting link, so as to avoid the occurrence of reactive power robbing or reactive circulation among the wind generation sets.
2. The method of claim 1, wherein the step-back element comprises:
Figure FDA0002260838410000011
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure FDA0002260838410000012
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
3. The method of claim 1, wherein the delay element comprises:
Figure FDA0002260838410000013
where S is the complex frequency, TrIs a time constant of the delay link.
4. Method according to claim 1, characterized in that the upper limit I of the reactive current reference value of the clipping element isqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure FDA0002260838410000014
Figure FDA0002260838410000015
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INThe rated current of the ith wind turbine generator set inverter.
5. The method of claim 1, wherein determining a compensation factor for the voltage closed loop regulation element further comprises:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure FDA0002260838410000021
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method comprises the following steps:
Figure FDA0002260838410000022
Figure FDA0002260838410000023
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure FDA0002260838410000024
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure FDA0002260838410000025
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure FDA0002260838410000026
for a per unit value of reactive power flowing through the high voltage side of the box transformer,
Figure FDA0002260838410000027
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure FDA0002260838410000028
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure FDA0002260838410000029
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure FDA00022608384100000210
and for the additional compensation factor angle of the ith wind turbine generator, setting different additional compensation reactances and additional compensation factor angles for each wind turbine generator, thereby realizing the reasonable distribution of reactive current among the wind turbine generators.
6. The method according to claim 1, wherein the smaller the compensation coefficient setting value is, the larger the reference value of reactive current distributed by the wind turbine is when the grid-connected point voltage deviates from the reference value beyond the dead zone.
7. The method according to claim 1, wherein the compensation factor setting rule for each wind turbine is that the larger the reactive adjustable range is, the smaller the compensation factor is, and there are:
Figure FDA0002260838410000031
Figure FDA0002260838410000032
wherein, ItqimaxThe maximum value of the reactive current at the inverter terminal of the wind turbine generator and the compensation coefficient deltaiA number close to zero or close to infinity is set.
8. The method of claim 1, wherein the voltage closed loop regulation stage comprises: the method comprises a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link.
9. A control system for closed-loop regulation of wind turbine generator terminal voltage, the system comprising:
the initial unit is used for connecting a voltage closed loop regulation link based on a quick voltage response control link in series in a current control link of the wind turbine generator inverter;
the determining unit is used for calculating a reactive current reference value of the wind turbine generator inverter through the voltage closed-loop adjusting link and determining a compensation coefficient of the voltage closed-loop adjusting link;
and the adjusting unit is used for adjusting the distribution of the reactive current among the wind generation sets according to the compensation coefficient of the voltage closed loop adjusting link, so that the phenomenon of reactive power robbing or reactive circulation among the wind generation sets is avoided.
10. The system of claim 9, wherein the difference adjustment stage comprises:
Figure FDA0002260838410000033
wherein VtFor grid-connected point voltage of wind turbine inverter, ItFor grid-connected current, X, of wind turbine inverterscIn order to add a compensating reactance,
Figure FDA0002260838410000034
for adding compensation factor angle, UcThe voltage of the grid-connected point of the wind turbine generator inverter after compensation.
11. The system of claim 9, wherein the delay element comprises:
Figure FDA0002260838410000041
where S is the complex frequency, TrIs a time constant of the delay link.
12. The system of claim 9, wherein the upper limit I of the reactive current reference value of the clipping elementqimaxLower limit of IqiminThe calculation method comprises the following steps:
Figure FDA0002260838410000042
Figure FDA0002260838410000043
wherein the current instantaneous active current of the ith wind turbine generator set is Itdi，INIs the i-th wind turbine set inverseRated current of the converter.
13. The system of claim 9, wherein determining the compensation factor for the voltage closed loop regulation element further comprises:
the method for calculating the compensation coefficient of the ith wind turbine generator set rapid voltage closed-loop regulation link comprises the following steps:
δi＝δi1+δi2
wherein, deltai1Is a natural compensation coefficient, delta, of a box transformer connected to the ith wind turbine generator inverteri2Adding a compensation coefficient for the ith wind turbine generator set inverter; deltaiA compensation coefficient of a voltage closed loop regulation link of the ith wind turbine generator set inverter;
the voltage drop calculation formula of the box type transformer in the wind turbine generator is as follows:
Figure FDA0002260838410000044
wherein R isTAnd XTRespectively the equivalent resistance and the equivalent reactance, P, of the high-voltage side of the box-type transformerTAnd QTRespectively, active power and reactive power, U, flowing through the high-voltage side of the box transformerTThe terminal voltage of the high-voltage side of the box type transformer;
when the rated value of the wind turbine generator is selected as the reference value, the natural compensation coefficient delta of the box type transformer connected with the ith wind turbine generator is the natural compensation coefficient delta of the box type transformer on the assumption that all physical quantities flowing through the box type transformer are the rated values of the inverteri1The calculation method comprises the following steps:
Figure FDA0002260838410000051
Figure FDA0002260838410000052
is the per unit value of the generator terminal voltage at the high-voltage side of the box type transformer,
Figure FDA0002260838410000053
for the per unit value of active power flowing through the high-voltage side of the box-type transformer,
Figure FDA0002260838410000054
is the per unit value of the equivalent resistance of the high-voltage side of the box type transformer,
Figure FDA0002260838410000055
for a per unit value of reactive power flowing through the high voltage side of the box transformer,
Figure FDA0002260838410000056
is the equivalent reactance per unit value on the high-voltage side of the box-type transformer,
Figure FDA0002260838410000057
the rated voltage per unit value of the high-voltage side of the box type transformer is obtained;
the additional compensation coefficient calculation method of the ith wind turbine generator inverter rapid voltage closed loop regulation link comprises the following steps:
Figure FDA0002260838410000058
wherein Xci is the additional compensating reactance of the ith wind generating set,
Figure FDA0002260838410000059
and for the additional compensation factor angle of the ith wind turbine generator, setting different additional compensation reactances and additional compensation factor angles for each wind turbine generator, thereby realizing the reasonable distribution of reactive current among the wind turbine generators.
14. The system of claim 9, wherein the smaller the compensation factor setting value is, the larger the reference value of reactive current distributed by the wind turbine is when the grid-connected point voltage deviates from the reference value beyond the dead zone.
15. The system according to claim 9, wherein the compensation factor setting rule for each wind turbine is that the larger the reactive adjustable range is, the smaller the compensation factor is, and there are:
Figure FDA00022608384100000510
Figure FDA00022608384100000511
wherein, ItqimaxThe maximum value of the reactive current at the inverter terminal of the wind turbine generator and the compensation coefficient deltaiA number close to zero or close to infinity is set.
16. The system of claim 9, wherein the voltage closed loop regulation element comprises: the method comprises a difference adjustment link, a delay link, a dead zone link, a first series correction link, a second series correction link, an amplification link and an amplitude limiting link.
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