CN116316902A - Control method and control device of voltage source type wind generating set - Google Patents

Control method and control device of voltage source type wind generating set Download PDF

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Publication number
CN116316902A
CN116316902A CN202111570900.6A CN202111570900A CN116316902A CN 116316902 A CN116316902 A CN 116316902A CN 202111570900 A CN202111570900 A CN 202111570900A CN 116316902 A CN116316902 A CN 116316902A
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power
grid
voltage
axis component
generating set
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Chinese (zh)
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于敬帅
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Xinjiang Goldwind Science and Technology Co Ltd
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Xinjiang Goldwind Science and Technology Co Ltd
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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
    • H02J3/381—Dispersed generators
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • 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

Abstract

The disclosure provides a control method and a control device for a voltage source type wind generating set. The control method comprises the following steps: the method comprises the steps of obtaining a DC bus power set value by carrying out proportional integral operation on deviation between a DC bus voltage measured value and a DC bus voltage reference value; obtaining the power requirement of a wind generating set; acquiring grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductance current and the power feedback coefficient; determining a virtual internal potential phase based on the DC bus power set value, the power requirement of the wind generating set and the grid-side power of the wind generating set; determining a d-axis component and a q-axis component of the modulation voltage based on the reactive power set value, the reactive power measured value and the rated voltage amplitude of the power grid of the wind generating set; and controlling a grid-side converter of the wind generating set according to the virtual internal potential phase and the d-axis component and the q-axis component of the modulation voltage, so as to adjust the grid-connected point injection voltage of the wind generating set.

Description

Control method and control device of voltage source type wind generating set
Technical Field
The present disclosure relates to the field of wind power generation, and more particularly, to a control method and a control device for a voltage source type wind power generator set.
Background
For a dual high power system of a high-ratio new energy and a high-ratio power electronic device, the new energy grid connection complexity is increased. In particular, in a dual high context, the number of power quality problems such as unbalanced loads, harmonics, etc. in the power system is increasing. When the grid side of the voltage source type wind generating set is controlled, the active power feedback value is directly obtained by directly calculating the grid side voltage and current signals after dq conversion, but when non-power frequency components such as negative sequence, harmonic wave and the like occur in a power system, the reference phase angle of SVPWM output by an active loop also deviates, and the grid connection stability of the voltage source type wind generating set is affected.
Disclosure of Invention
An embodiment of the present disclosure is directed to providing a control method and a control device for a voltage source type wind turbine generator system, which can reduce negative sequence components of voltage/current included in a control signal of the wind turbine generator system, thereby improving grid connection stability of the wind turbine generator system.
In one general aspect, there is provided a control method of a voltage source type wind power generation set, the control method including: the method comprises the steps of performing proportional integral operation on deviation between a direct current bus voltage measured value and a direct current bus voltage reference value of a wind generating set to obtain a direct current bus power set value; obtaining the power demand of the wind generating set based on the torque demand value and the rotating speed of the wind generating set; acquiring grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductance current and the power feedback coefficient; determining a virtual internal potential phase based on the DC bus power set value, the power requirement of the wind generating set and the grid-side power of the wind generating set; determining a d-axis component and a q-axis component of the modulation voltage based on the reactive power set value, the reactive power measured value and the rated voltage amplitude of the power grid of the wind generating set; and controlling a grid-side converter of the wind generating set according to the virtual internal potential phase, the d-axis component and the q-axis component of the modulation voltage, so as to adjust the grid-connected point injection voltage of the wind generating set.
Optionally, the step of obtaining the grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductor current and the power feedback coefficient comprises: the method comprises the steps of obtaining positive sequence components of grid-connected voltage under a dq coordinate system by decoupling the grid-connected voltage in a double synchronous coordinate system and performing low-pass filtering treatment; the method comprises the steps of obtaining a positive sequence component of filter inductor current under a dq coordinate system by carrying out double synchronous coordinate system decoupling and low-pass filtering treatment on the filter inductor current at a network side; and acquiring the grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage under the dq coordinate system, the positive sequence component of the filter inductance current under the dq coordinate system and the power feedback coefficient.
Optionally, the step of obtaining the grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage in the dq coordinate system, the positive sequence component of the filter inductor current in the dq coordinate system, and the power feedback coefficient includes: calculating a first product of a positive sequence component of a d-axis component of the grid-connected voltage in the dq coordinate system and a positive sequence component of a d-axis component of the filter inductor current in the dq coordinate system; calculating a second product of the positive sequence component of the q-axis component of the grid-connected voltage in the dq coordinate system and the positive sequence component of the q-axis component of the filter inductor current in the dq coordinate system; calculating a sum of the first product and the second product; and determining the product of the sum and the power feedback coefficient as the network side power of the wind generating set.
Optionally, the step of determining the virtual internal potential phase based on the dc bus power setting, the power demand of the wind turbine and the grid side power of the wind turbine comprises: adding the power set value of the direct current bus to the power demand of the wind generating set, and then subtracting the grid-side power of the grid-side converter to obtain an active power deviation; determining a virtual angular frequency deviation based on the active power deviation; determining a virtual angular frequency based on the virtual angular frequency deviation and the rated angular frequency of the power grid; the virtual internal potential phase is determined based on the virtual angular frequency.
Optionally, the step of determining the d-axis component and the q-axis component of the modulation voltage based on the reactive power set point, the reactive power measurement value, the rated voltage amplitude of the grid of the wind turbine comprises: determining a disturbance component of the alternating current bus voltage based on the reactive power set value and the reactive power measured value of the wind generating set; determining the d-axis component of the grid-connected reference voltage under the dq coordinate system based on the disturbance quantity of the alternating current bus voltage and the rated voltage amplitude of the alternating current power grid; setting the q-axis component of the grid-connected reference voltage in the dq coordinate system to 0; the d-axis component and the q-axis component of the modulation voltage are determined based on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system.
Optionally, the step of determining the d-axis component and the q-axis component of the modulation voltage based on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system comprises: the d-axis component and the q-axis component of the modulation voltage are obtained by performing voltage outer-loop control on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system, or by performing voltage outer-loop control and current inner-loop control on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system.
Optionally, the power feedback coefficient is greater than or equal to 1.5.
In another general aspect, there is provided a control device of a voltage source type wind power generation set, the control device including: the power set value acquisition unit is configured to acquire a DC bus power set value by performing proportional integral operation on deviation between a DC bus voltage measured value and a DC bus voltage reference value of the wind generating set; the power demand acquisition unit is configured to acquire grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductance current and the power feedback coefficient; the grid-side power acquisition unit is configured to acquire grid-side power of the wind generating set based on grid-connected voltage, filter inductance current and power feedback coefficient; a virtual internal potential phase determining unit configured to determine a virtual internal potential phase based on the dc bus power set value, the wind generator power demand, and the grid-side power of the wind generator set; a modulation voltage acquisition unit configured to determine a d-axis component and a q-axis component of the modulation voltage based on the reactive power set value, the reactive power measurement value, and the rated voltage amplitude of the power grid of the wind turbine generator; and the grid-side converter control unit is configured to control the grid-side converter of the wind generating set according to the virtual internal potential phase and the d-axis component and the q-axis component of the modulation voltage so as to adjust the injection voltage of the grid-connected point of the wind generating set.
Optionally, the control device of the voltage source type wind generating set is arranged in a converter controller of the voltage source type wind generating set.
In another general aspect, there is provided a computer-readable storage medium storing a computer program which, when executed by a processor, implements a method of controlling a wind turbine generator set as described above.
In another general aspect, there is provided a computing device, the computing device comprising: a processor; and a memory storing a computer program which, when executed by the processor, implements the control method of the wind turbine generator set as described above.
Optionally, the computing device is a converter controller of a voltage source type wind generating set.
In another general aspect, a voltage source wind power plant is provided, comprising a control device of a voltage source wind power plant as described above or a computing device as described above.
According to the control method and the control device of the voltage source type wind generating set, only the positive sequence component of the voltage/current is used when the grid side power of the wind generating set is calculated, the negative sequence component of the voltage/current contained in the control signal of the wind generating set is reduced, and the grid connection stability of the wind generating set can be remarkably improved.
Drawings
The foregoing and other objects and features of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.
Fig. 1 is a flowchart illustrating a control method of a voltage source type wind power generation set according to an embodiment of the present disclosure.
Fig. 2 is a schematic block diagram illustrating a control method of a voltage source type wind power generation set according to an embodiment of the present disclosure.
FIG. 3 is a block diagram of a control device of a voltage source type wind power generator set according to an embodiment of the disclosure.
Fig. 4 is a block diagram illustrating a computing device according to an embodiment of the present disclosure.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of the present application. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the present application, except for operations that must occur in a particular order. Furthermore, descriptions of features known in the art may be omitted for clarity and conciseness.
The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and/or systems described herein, which will be apparent after an understanding of the present disclosure.
As used herein, the term "and/or" includes any one of the listed items associated as well as any combination of any two or more.
Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.
In the description, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" or "coupled to" the other element, it can be directly "on" the other element, be directly "connected to" or be "coupled to" the other element, or one or more other elements intervening elements may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" or "directly coupled to" another element, there may be no other element intervening elements present.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or combinations thereof.
Unless defined otherwise, all 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 disclosure belongs after understanding this disclosure. Unless explicitly so defined herein, terms (such as those defined in a general dictionary) should be construed to have meanings consistent with their meanings in the context of the relevant art and the present disclosure, and should not be interpreted idealized or overly formal.
In addition, in the description of the examples, when it is considered that detailed descriptions of well-known related structures or functions will cause a ambiguous explanation of the present disclosure, such detailed descriptions will be omitted.
Fig. 1 is a flowchart illustrating a control method of a voltage source type wind power generation set according to an embodiment of the present disclosure. Fig. 2 is a schematic block diagram illustrating a control method of a voltage source type wind power generation set according to an embodiment of the present disclosure. The control method of the voltage source type wind generating set according to the embodiment of the present disclosure may be performed by a main controller, a converter controller or other dedicated controller of the wind generating set.
Referring to fig. 1 and 2, in step S101, a dc bus voltage measurement u of a wind turbine is measured dc And a DC bus voltage reference value u dcref The deviation between the two power control circuits is subjected to Proportional Integral (PI) operation to obtain a DC bus power set value P DC . The deviation between the dc bus voltage measurement and the dc bus voltage reference of the wind generating set may be a difference or a square difference between the dc bus voltage measurement and the dc bus voltage reference, but the disclosure is not limited thereto and may be other forms of deviation. As shown in FIG. 2, the DC bus voltage measurement u is used dc And a DC bus voltage reference value u dcref Is the square difference of (i.e., u dc 2 -u dcref 2 ) The examples are illustrated, but the disclosure is not limited thereto. In addition, as shown in FIG. 2, the proportional operation element is denoted as K P_DC The integral operation element is denoted as K i_dc S, where K P_DC Representing the proportionality coefficient, K i_dc Representing the integral coefficient. Alternatively, a power limiting module may be provided after the proportional-integral operation link to thereby compare the dc bus power set point P obtained via the proportional-integral operation link DC Clipping is performed.
In step S102, a wind generator torque demand T may be based on the wind generating set demand * And wind generator rotational speed (e.g., angular velocity) ω w Obtaining the power demand P of the wind generating set w . For example, the wind turbine torque demand T may be set demand * And the rotational speed omega of the wind power generator w Calculated as the product of the power demand P of the wind generating set w 。
Next, in step S103, a grid-connected voltage u may be based on abc Positive sequence component of (1), filter inductor current i abc The positive sequence component and the power feedback coefficient of the wind generating set are obtained to obtain the network side power P of the wind generating set grd . In particular, the grid-connected voltage u can be used for abc Decoupling of a double synchronous coordinate systemLow-pass filtering to obtain positive sequence component of grid-connected voltage in dq coordinate system
Figure BDA0003423659940000061
At the same time, the inductance current i can be filtered by the net side abc Decoupling and low-pass filtering are carried out on the double synchronous coordinate system, and positive sequence component of filter inductance current under dq coordinate system is obtained>
Figure BDA0003423659940000062
Thereafter, positive sequence components of the grid-connected voltage in dq coordinate system can be based
Figure BDA0003423659940000063
Figure BDA0003423659940000064
Positive sequence component of the filter inductor current in dq coordinate system +.>
Figure BDA0003423659940000065
And a power feedback coefficient, obtaining network side power P of the wind generating set grd . Further, the positive sequence component of the d-axis component of the grid-connected voltage in the dq coordinate system can be calculated +.>
Figure BDA0003423659940000066
Positive sequence component +.f. to d-axis component of filter inductor current in dq coordinate system>
Figure BDA0003423659940000067
And calculates the q-axis component of the grid-connected voltage in dq coordinate system +.>
Figure BDA0003423659940000068
The positive sequence component of (2) and the q-axis component of the filter inductor current in dq coordinate system +.>
Figure BDA0003423659940000069
A second product of the positive sequence components of (c). The sum of the first product and the second product may then be calculated and the calculated sum and power fed backThe product of the coefficients is determined as the grid-side power P of the wind turbine grd . According to embodiments of the present disclosure, the power feedback coefficient is greater than or equal to 1.5. For example, when the power feedback coefficient is equal to 1.5, the grid side power P of the wind generating set grd Can be expressed as +.>
Figure BDA00034236599400000610
By the above processing, only the positive sequence component of the voltage/current can be used when calculating the grid-side power of the wind turbine, thereby reducing the negative sequence component contained in the control signal of the grid-side converter of the wind turbine.
In step S104, the DC bus power set point P may be based on DC Power requirement P of wind generating set w And grid-side power P of wind generating set grd The virtual internal potential phase θ is determined. In particular, the DC bus power set point P can be set DC Power demand P with wind power plant w Adding and then subtracting the grid side power P of the grid side converter grd Obtaining the active power deviation delta P ref . Thereafter, a virtual angular frequency deviation Δω may be determined based on the active power deviation. For example, the active power deviation DeltaP can be used ref And inputting a virtual inertial damping link to determine a virtual angular frequency deviation delta omega. As shown in FIG. 2, the virtual inertial damping element may be expressed as 1/(sK) J +K D ) Wherein K is J Representing the virtual inertia coefficient, K D Representing the virtual damping coefficient. After determining the virtual angular frequency deviation Δω, the virtual angular frequency deviation Δω and the nominal angular frequency ω of the grid may be based on 0 The virtual angular frequency ω is determined, and then the virtual internal potential phase θ may be determined based on the virtual angular frequency ω. As shown in fig. 2, the virtual angular frequency deviation Δω and the nominal angular frequency ω of the grid may be calculated 0 And adding to obtain the virtual angular frequency omega. Then, the virtual internal potential phase θ can be obtained by integrating the virtual angular frequency ω (expressed as 1/s in fig. 2).
In step S105, the reactive power setpoint Q may be based on the wind park 0 Reactive power measurement Q, rated voltage of the networkAmplitude U 0 Determining the d-axis component u of the modulated voltage md And q-axis component u mq . Note that step S103 is not necessarily performed after steps S101, S102, S103, S104, but may be performed in parallel with steps S101, S102, S103, S104, even before steps S101, S102, S103, S104.
Specifically, first, the reactive power set point Q may be based on the wind turbine generator set 0 And a reactive power measurement Q, determining a disturbance component of the ac busbar voltage. For example, the reactive power set point Q 0 The difference from the reactive power measurement Q is determined as a disturbance component of the ac bus voltage. Then, the disturbance quantity based on the AC bus voltage and the rated voltage amplitude U of the AC power grid can be used 0 Determining d-axis component U of grid-connected reference voltage in dq coordinate system dv * . For example, the disturbance variable of the ac busbar voltage and the rated voltage amplitude U of the ac network can be calculated 0 The sum is determined as the d-axis component U of the grid-connected reference voltage in the dq coordinate system dv * . Alternatively, the q-axis component U of the grid-connected reference voltage in the dq coordinate system can be used qv * Set to 0. Finally, the d-axis component U of the grid-connected reference voltage in dq coordinate system dv * And q-axis component U qv * Determining the d-axis component u of the modulated voltage md And q-axis component u mq 。
Further, the d-axis component U of the grid-connected reference voltage under the dq coordinate system can be obtained dv * And q-axis component U qv * Performing voltage outer loop control or by controlling d-axis component U of grid-connected reference voltage under dq coordinate system dv * And q-axis component U qv * Performing voltage outer loop control and current inner loop control to obtain d-axis component u of modulation voltage md And q-axis component u mq 。
For example, as shown in FIG. 2, the d-axis component U of the grid-tied reference voltage in the dq coordinate system may be calculated dv * And q-axis component U qv * Input to the voltage outer loop control module, and simultaneously, grid-connected voltage u under dq coordinate system dq And dq coordinate systemIs connected to the grid current i gdq And inputting the voltage to the voltage outer loop control module. The voltage outer loop control module can control the d-axis component U of the grid-connected reference voltage under the dq coordinate system dv * And q-axis component U qv * Performing voltage outer loop control to obtain a d-axis filter inductance current reference value I d * And q-axis filter inductor current reference value I q * . D-axis filter inductance current reference value I d * And q-axis filter inductor current reference value I q * Input to the current inner loop control module, and simultaneously, grid-connected voltage u under dq coordinate system dq And the filter inductance current i in dq coordinate system dq And inputting the current to the current inner loop control module. The current reference value I of the d-axis filtering inductor can be obtained through the current inner loop control module d * And q-axis filter inductor current reference value I q * Performing current inner loop control to obtain d-axis component u of modulation voltage md And q-axis component u mq 。
Optionally, a current limiting module may be added between the voltage outer loop control module and the current inner loop control module, so as to limit the current output by the voltage outer loop control module.
In addition, by proper modification of the voltage outer loop control module as shown in fig. 2, only the d-axis component U of the grid-connected reference voltage in the dq coordinate system can be controlled without current inner loop control dv * And q-axis component U qv * Performing voltage outer loop control to obtain d-axis component u of modulation voltage md And q-axis component u mq 。
Finally, in step S106, the d-axis component u of the modulation voltage is adjusted according to the virtual internal potential phase θ md And q-axis component u mq And controlling a grid-side converter of the wind generating set so as to adjust the injection voltage of the grid-connected point of the wind generating set.
According to embodiments of the present disclosure, the d-axis component u of the modulation voltage may be based on the virtual internal potential phase θ in the dq coordinate system md And q-axis component u mq Converted into three-phase voltage in abc coordinate system or two-phase voltage in alpha beta coordinate system. For example, as shown in FIG. 2, the d-axis component u of the modulated voltage may be converted by the coordinate conversion module based on the virtual internal potential phase θ in the dq coordinate system md And q-axis component u mq Converted into three-phase voltage under abc coordinate system or two-phase voltage under alpha beta coordinate system, and then input to SVPWM (Space Vector Pulse Width Modulation ) module for space vector pulse width modulation. The modulation signal after space vector pulse width modulation can be input to a grid-side converter to control the switch of an IGBT device in the grid-side converter, so that the injection voltage of the grid-connected point of the wind generating set is regulated.
According to the control method of the voltage source type wind generating set, only the positive sequence component of the voltage/current is used when the grid-side power of the wind generating set is calculated, the negative sequence component of the voltage/current contained in the control signal of the wind generating set is reduced, and the grid connection stability of the wind generating set can be remarkably improved.
FIG. 3 is a block diagram of a control device of a voltage source type wind power generator set according to an embodiment of the disclosure. The control device of the voltage source type wind generating set according to the embodiment of the disclosure can be arranged in or implemented as a main controller, a converter controller or other controllers of the wind generating set.
Referring to fig. 3, a control device 300 of a voltage source type wind power generation set may include a power set value acquisition unit 310, a power demand acquisition unit 320, a grid side power acquisition unit 330, a virtual internal potential phase determination unit 340, a modulation voltage acquisition unit 350, and a grid side converter control unit 360.
The power set value obtaining unit 310 may obtain the measured value u of the DC bus voltage of the wind generating set dc And a DC bus voltage reference value u dcref The deviation between the two power control circuits is subjected to Proportional Integral (PI) operation to obtain a DC bus power set value P DC 。
The power demand acquisition unit 320 may be based on the wind generator torque demand value T of the wind generator set demand * And wind power generator rotationSpeed (e.g. angular speed) ω w Obtaining the power demand P of the wind generating set w 。
The grid-side power acquisition unit 330 may be based on the grid-connected voltage u abc Positive sequence component of (1), filter inductor current i abc The positive sequence component and the power feedback coefficient of the wind generating set are obtained to obtain the network side power P of the wind generating set grd . Specifically, the grid-side power acquisition unit 330 may obtain the grid-connected voltage u by abc Decoupling and low-pass filtering are carried out on the double synchronous coordinate system, and positive sequence components of grid-connected voltage under the dq coordinate system are obtained
Figure BDA0003423659940000091
By filtering the inductor current i on the net side abc Decoupling and low-pass filtering are carried out on the double synchronous coordinate system, and positive sequence component of filter inductance current under dq coordinate system is obtained>
Figure BDA0003423659940000092
And based on the positive sequence component of the grid-connected voltage in the dq coordinate system>
Figure BDA0003423659940000093
Positive sequence component of the filter inductor current in dq coordinate system +.>
Figure BDA0003423659940000094
And a power feedback coefficient, obtaining network side power P of the wind generating set grd . For example, the grid-side power acquisition unit 330 may calculate the positive sequence component +.o of the d-axis component of the grid-connected voltage in the dq-frame>
Figure BDA0003423659940000095
Positive sequence component +.f. to d-axis component of filter inductor current in dq coordinate system>
Figure BDA0003423659940000096
And calculates the q-axis component of the grid-connected voltage in dq coordinate system +.>
Figure BDA0003423659940000097
The positive sequence component of (2) and the q-axis component of the filter inductor current in dq coordinate system +.>
Figure BDA0003423659940000098
A second product of the positive sequence components of (c). The grid-side power acquisition unit 330 may then calculate the sum of the first product and the second product and determine the product of the calculated sum and the power feedback coefficient as the grid-side power P of the wind turbine grd . According to embodiments of the present disclosure, the power feedback coefficient is greater than or equal to 1.5.
The virtual internal potential phase determination unit 340 may be based on the dc bus power set point P DC Power requirement P of wind generating set w And grid-side power P of wind generating set grd The virtual internal potential phase θ is determined. Specifically, the virtual internal potential phase determination unit 340 may set the dc bus power set point P DC Power demand P with wind power plant w Adding and then subtracting the grid side power P of the grid side converter grd Obtaining the active power deviation delta P ref . Subsequently, the virtual internal potential phase determining unit 340 may determine the virtual angular frequency deviation Δω based on the active power deviation. Next, the virtual internal potential phase determination unit 340 may be based on the virtual angular frequency deviation Δω and the rated angular frequency ω of the power grid 0 A virtual angular frequency ω is determined. Finally, the virtual internal potential phase determining unit 340 determines the virtual internal potential phase θ based on the virtual angular frequency ω.
The modulation voltage acquisition unit 350 may be based on the reactive power set point Q of the wind turbine generator system 0 Rated voltage amplitude U of reactive power measurement Q and power grid 0 Determining the d-axis component u of the modulated voltage md And q-axis component u mq . In particular, the modulation voltage acquisition unit 350 may first be based on the reactive power set point Q of the wind park 0 And reactive power measurement Q, the disturbance component of the AC bus voltage is determined, and then the disturbance component of the AC bus voltage and the rated voltage amplitude U of the AC power grid can be based 0 Determining d-axis component U of grid-connected reference voltage in dq coordinate system dv * . Alternatively, the modulated voltage is obtainedThe fetch unit 350 may compute the q-axis component U of the grid-tied reference voltage in the dq coordinate system qv * Set to 0. Furthermore, the modulation voltage acquisition unit 350 may be based on the d-axis component U of the grid-connected reference voltage in the dq coordinate system dv * And q-axis component U qv * Determining the d-axis component u of the modulated voltage md And q-axis component u mq 。
According to embodiments of the present disclosure, the modulation voltage acquisition unit 350 may obtain the d-axis component U of the grid-connected reference voltage in the dq coordinate system by dv * And q-axis component U qv * Performing voltage outer loop control or by controlling d-axis component U of grid-connected reference voltage under dq coordinate system dv * And q-axis component U qv * Performing voltage outer loop control and current inner loop control to obtain d-axis component u of modulation voltage md And q-axis component u mq 。
The grid-side converter control unit 360 can control the d-axis component u of the modulation voltage according to the virtual internal potential phase θ md And q-axis component u mq And controlling a grid-side converter of the wind generating set so as to adjust the injection voltage of the grid-connected point of the wind generating set. In particular, the grid-side converter control unit 360 may modulate the d-axis component u of the voltage based on the virtual internal potential phase θ in the dq coordinate system md And q-axis component u mq And converting the voltage into three-phase voltages in an abc coordinate system or two-phase voltages in an alpha beta coordinate system, and then performing space vector pulse width modulation on the three-phase voltages in the abc coordinate system or the two-phase voltages in the alpha beta coordinate system. Thereafter, the grid-side converter control unit 360 may control switching of the IGBT devices in the grid-side converter of the wind turbine generator set using the modulation signal after the space vector pulse width modulation, thereby adjusting the injection voltage of the grid-connected point of the wind turbine generator set.
Fig. 4 is a block diagram illustrating a computing device according to an embodiment of the present disclosure. The computing device may be implemented in or as a master controller, converter controller or other controller of the wind turbine.
Referring to fig. 4, a computing device 400 according to an embodiment of the present disclosure may include a processor 410 and a memory 420. The processor 410 may include, but is not limited to, a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a microcomputer, a Field Programmable Gate Array (FPGA), a system on a chip (SoC), a microprocessor, an Application Specific Integrated Circuit (ASIC), and the like. The memory 420 stores computer programs to be executed by the processor 410. Memory 420 includes high-speed random access memory and/or nonvolatile computer readable storage media. When the processor 410 executes the computer program stored in the memory 420, the control method of the wind turbine generator set as described above may be implemented.
Alternatively, computing device 400 may communicate with various components in the wind turbine in a wired/wireless communication manner, and may also communicate with devices external to the wind turbine and/or the wind farm in a wired/wireless communication manner.
The control method of the voltage source type wind power generation set according to the embodiment of the present disclosure may be written as a computer program and stored on a computer readable storage medium. The control method of the voltage source type wind power generation set as described above can be implemented when the computer program is executed by the processor. Examples of the computer readable storage medium include: read-only memory (ROM), random-access programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), random-access memory (RAM), dynamic random-access memory (DRAM), static random-access memory (SRAM), flash memory, nonvolatile memory, CD-ROM, CD-R, CD + R, CD-RW, CD+RW, DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD+RW, DVD-RAM, BD-ROM, BD-R, BD-R LTH, BD-RE, blu-ray or optical disk storage, hard Disk Drives (HDD), solid State Disks (SSD), card memory (such as multimedia cards, secure Digital (SD) cards or ultra-fast digital (XD) cards), magnetic tape, floppy disks, magneto-optical data storage, hard disks, solid state disks, and any other means configured to store computer programs and any associated data, data files and data structures in a non-transitory manner and to provide the computer programs and any associated data, data files and data structures to a processor or computer to enable the processor or computer to execute the programs. In one example, the computer program and any associated data, data files, and data structures are distributed across networked computer systems such that the computer program and any associated data, data files, and data structures are stored, accessed, and executed in a distributed manner by one or more processors or computers.
According to the control method and the control device of the voltage source type wind generating set, only the positive sequence component of the voltage/current is used when the grid side power of the wind generating set is calculated, the negative sequence component of the voltage/current contained in the control signal of the wind generating set is reduced, and the grid connection stability of the wind generating set can be remarkably improved.
Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims (13)

1. A control method of a voltage source type wind generating set, characterized in that the control method comprises:
the method comprises the steps of performing proportional integral operation on deviation between a direct current bus voltage measured value and a direct current bus voltage reference value of a wind generating set to obtain a direct current bus power set value;
obtaining the power demand of the wind generating set based on the torque demand value and the rotating speed of the wind generating set;
acquiring grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductance current and the power feedback coefficient;
determining a virtual internal potential phase based on the DC bus power set value, the power requirement of the wind generating set and the grid-side power of the wind generating set;
determining a d-axis component and a q-axis component of the modulation voltage based on the reactive power set value, the reactive power measured value and the rated voltage amplitude of the power grid of the wind generating set;
and controlling a grid-side converter of the wind generating set according to the virtual internal potential phase, the d-axis component and the q-axis component of the modulation voltage, so as to adjust the grid-connected point injection voltage of the wind generating set.
2. The control method according to claim 1, wherein the step of obtaining the grid-side power of the wind turbine generator set based on the positive sequence component of the grid-connected voltage, the positive sequence component of the filter inductor current, and the power feedback coefficient includes:
the method comprises the steps of obtaining positive sequence components of grid-connected voltage under a dq coordinate system by decoupling the grid-connected voltage in a double synchronous coordinate system and performing low-pass filtering treatment;
the method comprises the steps of obtaining a positive sequence component of filter inductor current under a dq coordinate system by carrying out double synchronous coordinate system decoupling and low-pass filtering treatment on the filter inductor current at a network side;
and acquiring the grid-side power of the wind generating set based on the positive sequence component of the grid-connected voltage under the dq coordinate system, the positive sequence component of the filter inductance current under the dq coordinate system and the power feedback coefficient.
3. The control method according to claim 2, wherein the step of obtaining the grid-side power of the wind turbine generator set based on the positive sequence component of the grid-connected voltage in the dq-frame, the positive sequence component of the filter inductor current in the dq-frame, and the power feedback coefficient includes:
calculating a first product of a positive sequence component of a d-axis component of the grid-connected voltage in the dq coordinate system and a positive sequence component of a d-axis component of the filter inductor current in the dq coordinate system;
calculating a second product of the positive sequence component of the q-axis component of the grid-connected voltage in the dq coordinate system and the positive sequence component of the q-axis component of the filter inductor current in the dq coordinate system;
calculating a sum of the first product and the second product;
and determining the product of the sum and the power feedback coefficient as the network side power of the wind generating set.
4. The control method of claim 1, wherein determining the virtual internal potential phase based on the dc bus power setting, the power demand of the wind turbine, and the grid side power of the wind turbine comprises:
adding the power set value of the direct current bus to the power demand of the wind generating set, and then subtracting the grid-side power of the grid-side converter to obtain an active power deviation;
determining a virtual angular frequency deviation based on the active power deviation;
determining a virtual angular frequency based on the virtual angular frequency deviation and the rated angular frequency of the power grid;
the virtual internal potential phase is determined based on the virtual angular frequency.
5. The control method according to claim 1, wherein the step of determining d-axis and q-axis components of the modulation voltage based on the reactive power set point, the reactive power measurement value, and the rated voltage amplitude of the power grid of the wind power generation set comprises:
determining a disturbance component of the alternating current bus voltage based on the reactive power set value and the reactive power measured value of the wind generating set;
determining the d-axis component of the grid-connected reference voltage under the dq coordinate system based on the disturbance quantity of the alternating current bus voltage and the rated voltage amplitude of the alternating current power grid;
setting the q-axis component of the grid-connected reference voltage in the dq coordinate system to 0;
the d-axis component and the q-axis component of the modulation voltage are determined based on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system.
6. The control method according to claim 5, wherein the step of determining the d-axis component and the q-axis component of the modulation voltage based on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system comprises:
the d-axis component and the q-axis component of the modulation voltage are obtained by performing voltage outer-loop control on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system, or by performing voltage outer-loop control and current inner-loop control on the d-axis component and the q-axis component of the grid-connected reference voltage in the dq coordinate system.
7. The control method according to any one of claims 1 to 6, characterized in that the power feedback coefficient is greater than or equal to 1.5.
8. A control device for a voltage source type wind power generator set, the control device comprising:
the power set value acquisition unit is configured to acquire a DC bus power set value by performing proportional integral operation on deviation between a DC bus voltage measured value and a DC bus voltage reference value of the wind generating set;
a power demand acquisition unit configured to acquire a power demand of the wind turbine generator set based on a wind turbine generator torque demand value and a wind turbine generator rotational speed of the wind turbine generator set;
the grid-side power acquisition unit is configured to acquire grid-side power of the wind generating set based on grid-connected voltage, filter inductance current and power feedback coefficient;
a virtual internal potential phase determining unit configured to determine a virtual internal potential phase based on the dc bus power set value, the power demand of the wind turbine and the grid-side power of the wind turbine;
a modulation voltage acquisition unit configured to determine a d-axis component and a q-axis component of the modulation voltage based on the reactive power set value, the reactive power measurement value, and the rated voltage amplitude of the power grid of the wind turbine generator;
and the grid-side converter control unit is configured to control the grid-side converter of the wind generating set according to the virtual internal potential phase and the d-axis component and the q-axis component of the modulation voltage so as to adjust the injection voltage of the grid-connected point of the wind generating set.
9. The control device according to claim 8, wherein the control device of the voltage source type wind power generator set is provided in a converter controller of the voltage source type wind power generator set.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements a method of controlling a wind park according to any one of claims 1 to 8.
11. A computing device, the computing device comprising:
a processor;
memory storing a computer program which, when executed by a processor, implements a method of controlling a wind park according to any one of claims 1 to 8.
12. The computing device of claim 11, wherein the computing device is a converter controller of a voltage source wind turbine.
13. A voltage-source wind power generator set, characterized in that it comprises a control device of a voltage-source wind power generator set according to claim 8 or 9 or a computing device according to claim 11 or 12.
CN202111570900.6A 2021-12-21 2021-12-21 Control method and control device of voltage source type wind generating set Pending CN116316902A (en)

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