CN116073398A - Additional damping control system for improving synchronous stability of doubly-fed wind turbine generator - Google Patents

Additional damping control system for improving synchronous stability of doubly-fed wind turbine generator Download PDF

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Publication number
CN116073398A
CN116073398A CN202310021110.5A CN202310021110A CN116073398A CN 116073398 A CN116073398 A CN 116073398A CN 202310021110 A CN202310021110 A CN 202310021110A CN 116073398 A CN116073398 A CN 116073398A
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phase
locked loop
damping control
doubly
grid
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杨怡航
朱东海
邹旭东
胡家兵
迟永宁
康勇
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Huazhong University of Science and Technology
China Electric Power Research Institute Co Ltd CEPRI
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Huazhong University of Science and Technology
China Electric Power Research Institute Co Ltd CEPRI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses an additional damping control system for improving the synchronous stability of a doubly-fed wind turbine, which comprises a network side control structure, a damping control module and a network side converter current control loop, wherein a PI controller in the phase-locked loop is used for controlling the current control loop according to q-axis direct current voltage u sq Calculating a phase-locked loop frequency error signal omega between a phase-locked loop coordinate system and a reference coordinate system err The method comprises the steps of carrying out a first treatment on the surface of the The damping control module is used for controlling the phase-locked loop frequency error signal omega err Output compensation voltage U damp And superimposed to the output of the q-axis current controller in the grid-side converter current control loop to achieve disturbance rejection, wherein the transfer function of the damping control module is
Figure DDA0004042199010000011
Wherein omega 0 Is the angular velocity reference value, K w Is an additional damping gain coefficient, s is the Laplacian.

Description

Additional damping control system for improving synchronous stability of doubly-fed wind turbine generator
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to an additional damping control system for improving the synchronous stability of a doubly-fed wind turbine generator.
Background
With the continuous increase of the grid-connected capacity of wind power, the permeability of wind power is continuously improved, and the continuous safe and stable operation of a power system faces a plurality of challenges. In particular, large wind farms are typically located in remote areas and are connected to an ac grid by high-impedance long power lines, which significantly reduces the grid strength, makes the wind turbines more susceptible to dynamic disturbances of the grid, and reduces the synchronous stability of the system.
In order to solve the problem of small disturbance broadband oscillation of the doubly-fed wind turbine under a weak current network, the most common method is to adjust and optimize parameters of the phase-locked loop and reduce the bandwidth of the phase-locked loop to improve stability, however, changing the structure of the phase-locked loop increases the complex range of the phase-locked loop and reduces the dynamic performance of the phase-locked loop. In addition to modifying the phase locked loop, active damping control can be achieved by adding a feed-forward channel in the rotor-side current controller. However, rotor-side current loop control for doubly-fed fans typically includes various EMF and feedforward terms, and improvements to rotor-side control structures can increase the complexity of the rotor-side inverter control structure, resulting in insufficient rotor-side inverter capacity.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides an additional damping control system for improving the synchronization stability of a doubly-fed wind turbine, which aims to fully utilize the capacity of a grid-side converter and realize oscillation suppression by adjusting a grid-side control structure.
To achieve the above object, according to one aspect of the present invention, there is provided an additional damping control system for improving synchronization stability of a doubly-fed wind turbine, including a grid-side inverter and a grid-side control structure for providing three-phase voltages to the grid-side inverter, the grid-side control structure including a phase-locked loop, a damping control module, and a grid-side inverter current control loop, wherein,
the phase-locked loop comprises a Park conversion module, a phase-locked PI controller and an integrator, wherein the Park conversion module is used for converting grid-connected point three-phase voltage u sabc Performing Park conversion to obtain d-axis and q-axis direct current voltages u sd And u sq The method comprises the steps of carrying out a first treatment on the surface of the The phase-locked PI controller is used for controlling the phase-locked PI controller according to the q-axis direct current voltage u sq Calculating a phase-locked loop frequency error signal omega between a phase-locked loop coordinate system and a reference coordinate system err The integrator is used for generating a phase-locked loop frequency error signal omega err Integrating to obtain an output angle theta pll And feeds back to the Park conversion module;
the damping control module is used for controlling the phase-locked loop frequency error signal omega err Output compensation voltage U damp The transfer function of the damping control module is that
Figure BDA0004042198990000021
Wherein omega 0 Is the angular velocity reference value, K w Is an additional damping gain coefficient, s is a Laplacian operator;
the network side converter current control loop comprises a voltage calculation module and a Park inverse transformation module, wherein the voltage calculation module is used for calculating network side d-axis voltage U according to a network side converter current reference value and a current actual value gd And an initial net side q-axis voltage and superimposing the compensation voltage U on the initial net side q-axis voltage damp Obtaining the q-axis voltage U at the net side gq The method comprises the steps of carrying out a first treatment on the surface of the The Park inverse transformation module is used for transforming the net side d-axis voltage U gd And net side q-axis voltage U gq And performing Park inverse transformation to obtain three-phase voltages input to the grid-side converter.
In one embodiment, the phase-locked PI controller outputs a phase-locked loop frequency error signal ω err The expression of (2) is:
ω err ＝k p u sq +k i ∫u sq dt
wherein k is p Is the proportionality coefficient, k of the PI controller i Is the integral coefficient of the PI controller.
In one embodiment, in the grid-side converter current control loop, the grid-side q-axis voltage U gq The expression of (2) is:
U gq ＝G gpi (I gq_ref -I gq )+ω s L 1 I gd +U damp
wherein G is gpi Representing PI controllers in a network side current control loop, I gq_ref Reference value representing net point q-axis current, I gq Representing the actual value of the net point q-axis current, ω s L 1 I gd Represents cross-decoupling terms, ω therein s 、L 1 、I gd Respectively representing rated angular frequency, a net side filter inductance and net side d-axis current;
net side d-axis voltage U gd Expression of (2) the formula is:
U gd ＝G gpi (I gd_ref -I gd )+ω s L 1 I gq
wherein I is gd_ref Reference value representing net point d axis current, I gd Representing the actual value of the net point d-axis current, omega s L 1 I gq Representing cross-decoupling terms
In one embodiment, I gq_ref The value is 0.
In one embodiment, the mesh side control structure further comprises:
an isolation module arranged between the damping control module and the phase-locked loop for generating a phase-locked loop frequency error signal omega err Before the damping control module is input, the isolation module is used for controlling the phase-locked loop frequency error signal omega err After filtering, inputting the filtered signals into the damping control module, and when the doubly-fed wind turbine generator is in a steady state, isolating the phase-locked loop frequency error signal omega by the isolating module err When (when)When the doubly-fed wind turbine generator is disturbed, the isolation module enables the phase-locked loop frequency error signal omega to be err Through the device.
In one embodiment, the transfer function of the isolation module is
Figure BDA0004042198990000031
Wherein T is w Is the time constant of the isolation link, s is the Laplacian.
In one embodiment, T w The value range is 1 s-20 s.
In one of the embodiments, in the damping control module, the angular velocity reference value ω 0 For 314, add damping gain coefficient K w The range of the value of (2) is 50-200.
In one embodiment, three-phase current at grid-connected point is used as input current of the grid-side converter.
In one embodiment, the control system further includes a rotor-side inverter and a rotor-side control structure that provides three-phase voltages to the rotor-side inverter.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
1. the invention leads out the phase-locked loop frequency error signal and inputs the phase-locked loop frequency error signal into the damping control module with specific design, and the transfer function of the damping control module is that
Figure BDA0004042198990000041
Output a specific compensation voltage U damp And the system damping coefficient is ensured to be positive, so that small interference oscillation of the system is restrained.
2. The invention changes the control structure of the net side, can fully utilize the capacity of the net side converter of the doubly-fed fan, and avoids increasing the complexity of the control structure of the rotor side converter.
3. The change of parameters of the network side converter controller has larger influence on the stability of the system, so that the control effect of the network side additional damping controller is stronger than that of the machine side.
Drawings
FIG. 1 is a schematic diagram of a control system of a conventional doubly-fed wind turbine;
FIG. 2 is a circuit diagram of an additional damping control system that promotes synchronous stability of a doubly-fed wind turbine in one embodiment;
FIG. 3 is a simulated waveform diagram of a small disturbance instability phenomenon of a doubly-fed wind turbine generator in an embodiment without adding a damping control module, where (a) is a frequency f detected by a doubly-fed wind turbine phase-locked loop pll (b) inputting the q-axis voltage signal U of the IGBT to the grid-side converter gq ；
FIG. 4 is a simulated waveform diagram of a double-fed fan set with a damping control module for small interference suppression in an embodiment, (a) is the frequency f detected by a double-fed fan phase-locked loop pll (b) inputting the q-axis voltage signal U of the IGBT to the grid-side converter gq 。
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to facilitate understanding of the present invention, a conventional doubly-fed wind turbine generator control system is described first, and as shown in fig. 1, the entire doubly-fed wind turbine generator control system is divided into a grid-side structure and a rotor-side structure, wherein the grid-side has a grid-side converter GSC and a grid-side control structure, the rotor-side has a rotor-side converter RSC and a rotor-side control structure, and the rotor-side and the grid-side control the converters through current loops. The scheme improves the network side control structure, so that the traditional network side control structure is explained. Specifically, the phase-locked loop collects stator three-phase voltage u at a common connection Point (PCC) sabc Then, by the phase-locked loop, a phase-locked loop output can be obtainedAngle of departure theta pll . At steady state, stator three-phase voltage u sabc The d-axis dpll and the coordinate reference ds of the phase locked loop coordinate system are coincident, and the coordinate reference ds rotates at a constant frequency. In the dynamic process, the stator three-phase voltage u sabc A disturbance occurs first, the d-axis dpll of the phase-locked loop coordinate system tracks the disturbance, and the output angle of the phase-locked loop is the angle representing the phase-locked loop coordinate system and the reference coordinate system. Specifically, in the phase-locked loop, three-phase voltage u is first converted by Park conversion module sabcc Performing Park conversion to obtain d-axis and q-axis direct current voltages u sd And u sq Then taking the q-axis direct current voltage u sq Input phase-locked PI controller, output phase-locked loop frequency error signal omega through phase-locked PI controller err Phase-locked loop frequency error signal omega err Representing the frequency error of the phase-locked loop coordinate system relative to the reference coordinate system (ds) and then applying the phase-locked loop frequency error signal omega to err Superimposed reference coordinate system rotation frequency omega 1 Then integrating to obtain the phase-locked loop output angle theta pll And feeds back to the Park conversion module as the conversion parameters of the Park conversion module. In the network side current loop, collecting the output current of the network side converter and performing Park conversion to obtain the q-axis current actual value I gq And d-axis current actual value I gd Q-axis current reference value I to be set gq_ref And q-axis current actual value I gq One of the PI controllers G in the input network side current control loop gpi In the above, the d-axis current reference value I is to be set gd_ref And d-axis current actual value I gd Another PI controller G in the input network side current control loop gpi In which two PI controllers G gpi The output result is cross-decoupled to obtain the q-axis voltage U at the net side gq And net side d-axis voltage U gd And then performing Park inverse transformation to obtain three-phase voltages input into the grid-side converter, so as to realize control of the grid-side converter.
Based on the traditional structure, the invention improves the control structure at the net side.
Fig. 2 is a circuit diagram of an additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to an embodiment of the present invention, where a grid-side control structure includes a phase-locked loop, a damping control module, and a grid-side converter current control loop.
The phase-locked loop comprises a Park conversion module, a phase-locked PI controller and an integrator, wherein the Park conversion module is used for converting grid-connected point three-phase voltage u sabc Performing Park conversion to obtain d-axis and q-axis direct current voltages u sd And u sq The method comprises the steps of carrying out a first treatment on the surface of the The phase-locked PI controller is used for controlling the phase-locked PI controller according to the q-axis direct current voltage u sq Calculating a phase-locked loop frequency error signal omega between a phase-locked loop coordinate system and a reference coordinate system err The integrator is used for generating a phase-locked loop frequency error signal omega err Integrating to obtain an output angle theta pll And fed back to the Park transform module.
The damping control module is used for controlling the phase-locked loop frequency error signal omega err Output compensation voltage U damp The transfer function of the damping control module is that
Figure BDA0004042198990000061
Wherein omega 0 Is the angular velocity reference value, K w Is an additional damping gain coefficient, s is the Laplacian. Specifically, omega 0 Is the angular velocity reference value, value 314; k (K) w The gain coefficient of the additional damping is increased, so that the damping effect can be improved, but the gain coefficient is limited by the capacity of the network side converter. In this example K w Taking 100.
The grid-side converter current control loop comprises a voltage calculation module and a Park inverse transformation module, wherein the voltage calculation module is used for calculating grid-side d-axis voltage U according to a grid-connected point current reference value and a current actual value gd And an initial net side q-axis voltage and superimposing the compensation voltage U on the initial net side q-axis voltage damp Obtaining the q-axis voltage U at the net side gq The method comprises the steps of carrying out a first treatment on the surface of the The Park inverse transformation module is used for transforming the net side d-axis voltage U gd And net side q-axis voltage U gq And performing Park inverse transformation to obtain three-phase voltages input to the grid-side converter.
Specifically, in the phase-locked loop, ω outputted from the PI controller of the phase-locked loop is calculated according to the following formula err ：
ω err ＝k p u sq +k i ∫u sq dt
Wherein k is p Is the proportionality coefficient, k of the PI controller i Is the integral coefficient of the PI controller.
In an embodiment, the network side control system further includes an isolation module, which is essentially a filter, disposed between the damping control module and the phase-locked loop. In said phase-locked loop frequency error signal omega err Before the damping control module is input, the isolation module is used for controlling the phase-locked loop frequency error signal omega err Filtering and inputting the damping control module. When the doubly-fed wind turbine generator is in a steady state, the isolation module cuts off the phase-locked loop frequency error signal omega err I.e. the signal input to the damping control module is 0, at this time, the control is performed according to the conventional mode; when the doubly-fed wind turbine generator is disturbed, the isolation module enables the phase-locked loop frequency error signal omega to be err By, i.e. not 0, the phase-locked loop frequency error signal omega err And the input damping control module performs voltage compensation regulation and control.
In particular, the transfer function of the damping module can be expressed as:
Figure BDA0004042198990000071
wherein omega 0 Is the angular velocity reference value, value 314; k (K) w The gain coefficient of the additional damping is increased, so that the damping effect can be improved, but the gain coefficient is limited by the capacity of the network side converter. In this example K w Taking 100.
In one embodiment, in the grid-side converter current control loop, the compensation voltage U will be obtained damp Superimposed to the output of the grid-side q-axis current transformer such that:
U gq ＝G gpi (I gq_ref -I gq )+ω s L 1 I gd +U damp
wherein G is gpi The PI link of the network side current controller is represented, and the expression is k p +k i /s，k p Represents the scaling factor, k, of the PI controller i And the integral coefficient of the PI controller is represented, and s is the Laplacian. I gq_ref The q-axis current reference value is represented, and the value is generally 0; i gq Representing the grid side converter output current; omega s L 1 I gd Represents cross-decoupling terms, ω therein s 、L 1 、I gd The rated angular frequency, the net side filter inductance and the net side d-axis current are respectively represented.
The output end of the net-side q-axis current converter maintains a traditional calculation formula, namely net-side d-axis voltage U gd The expression of (2) is:
U gd ＝G gpi (I gd_ref -I gd )+ω s L 1 I gq
in the following, a simulation study was performed using a 1.5MW double-fed fan under a typical parameter. The bandwidth of the phase-locked loop PI controller is increased from 20Hz to 70Hz in 2s, and the additional damping control system for improving the synchronous stability of the doubly-fed wind turbine generator provided by the invention can be used for automatically adjusting the modulating voltage command of the network side q-axis current controller, so that the small-interference instability of the system can be restrained. As a result, FIG. 3 is a simulated waveform diagram of a small disturbance instability phenomenon of a doubly-fed wind turbine without adding a damping control module, where (a) is the frequency f detected by a doubly-fed wind turbine phase-locked loop pll (b) inputting the q-axis voltage signal U of the IGBT to the grid-side converter gq It can be seen that the system gradually oscillates and diverges after 2 seconds, i.e. the small disturbance is not suppressed. FIG. 4 is a simulated waveform diagram of a double-fed fan set with a damping control module for small interference suppression, (a) is the frequency f detected by a double-fed fan phase-locked loop pll (b) inputting the q-axis voltage signal U of the IGBT to the grid-side converter gq It can be seen that the system is fast and stable, i.e. small disturbances are effectively suppressed. In conclusion, the invention can compensate the system damping of the doubly-fed wind turbine generator set by leading out the phase-locked loop frequency error signal and inputting the phase-locked loop frequency error signal into the damping control module with specific design, thereby ensuring the system damping coefficientPositive, thereby suppressing system small interference oscillations.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. An additional damping control system for improving the synchronous stability of a doubly-fed wind turbine generator is characterized by comprising a grid-side converter and a grid-side control structure for providing three-phase voltage for the grid-side converter, wherein the grid-side control structure comprises a phase-locked loop, a damping control module and a grid-side converter current control loop,
the phase-locked loop comprises a Park conversion module, a phase-locked PI controller and an integrator, wherein the Park conversion module is used for converting grid-connected point three-phase voltage u sabc Performing Park conversion to obtain d-axis and q-axis direct current voltages u sd And u sq The method comprises the steps of carrying out a first treatment on the surface of the The phase-locked PI controller is used for controlling the phase-locked PI controller according to the q-axis direct current voltage u sq Calculating a phase-locked loop frequency error signal omega between a phase-locked loop coordinate system and a reference coordinate system err The integrator is used for generating a phase-locked loop frequency error signal omega err Integrating to obtain an output angle theta pll And feeds back to the Park conversion module;
the damping control module is used for controlling the phase-locked loop frequency error signal omega err Output compensation voltage U damp The transfer function of the damping control module is that
Figure FDA0004042198980000011
Wherein omega 0 Is the angular velocity reference value, K w Is an additional damping gain coefficient, s is a Laplacian operator;
the network side converter current control loop comprises a voltage calculation module and a Park inverse transformation module, wherein the voltage calculation module is used for calculating network side d-axis voltage U according to a network side converter current reference value and a current actual value gd And an initial net side q-axis voltage and at an initial net side qSuperimposing the compensation voltage U on the shaft voltage damp Obtaining the q-axis voltage U at the net side gq The method comprises the steps of carrying out a first treatment on the surface of the The Park inverse transformation module is used for transforming the net side d-axis voltage U gd And net side q-axis voltage U gq And performing Park inverse transformation to obtain three-phase voltages input to the grid-side converter.
2. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein the phase-locked PI controller outputs a phase-locked loop frequency error signal ω err The expression of (2) is:
ω err ＝k p u sq +k i ∫u sq dt
wherein k is p Is the proportionality coefficient, k of the PI controller i Is the integral coefficient of the PI controller.
3. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein in said grid-side converter current control loop, a grid-side q-axis voltage U gq The expression of (2) is:
U gq ＝G gpi (I gq_ref -I gq )+ω s L 1 I gd +U damp
wherein G is gpi Representing PI controllers in a network side current control loop, I gq_ref Reference value representing net point q-axis current, I gq Representing the actual value of the net point q-axis current, ω s L 1 I gd Represents cross-decoupling terms, ω therein s 、L 1 、I gd Respectively representing rated angular frequency, a net side filter inductance and net side d-axis current;
net side d-axis voltage U gd The expression of (2) is:
U gd ＝G gpi (I gd_ref -I gd )+ω s L 1 I gq
wherein I is gd_ref Reference value representing net point d axis current, I gd Representing the actual value of the dot d-axis current, omega s L 1 I gq Representing cross-decoupling terms.
4. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 3, wherein I gq_ref The value is 0.
5. The additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein said grid-side control structure further comprises:
an isolation module arranged between the damping control module and the phase-locked loop for generating a phase-locked loop frequency error signal omega err Before the damping control module is input, the isolation module is used for controlling the phase-locked loop frequency error signal omega err After filtering, inputting the filtered signals into the damping control module, and when the doubly-fed wind turbine generator is in a steady state, isolating the phase-locked loop frequency error signal omega by the isolating module err When the doubly-fed wind turbine generator is disturbed, the isolation module enables the phase-locked loop frequency error signal omega to be err Through the device.
6. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 5, wherein said isolation module has a transfer function of
Figure FDA0004042198980000021
Wherein T is w Is the time constant of the isolation link, s is the Laplacian.
7. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 6, wherein T is w The value range is 1 s-20 s.
8. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein in the damping control module, the angular velocity reference value ω 0 For 314, add damping gainCoefficient K w The range of the value of (2) is 50-200.
9. The additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein grid-tied three-phase current is used as an input current of the grid-side converter.
10. An additional damping control system for improving synchronization stability of a doubly-fed wind turbine according to claim 1, wherein said control system further comprises a rotor-side inverter and a rotor-side control structure for providing a three-phase voltage to said rotor-side inverter.
CN202310021110.5A 2023-01-06 2023-01-06 Additional damping control system for improving synchronous stability of doubly-fed wind turbine generator Pending CN116073398A (en)

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CN117650529A (en) * 2024-01-30 2024-03-05 武汉理工大学 Method and device for suppressing subsynchronous oscillation of grid-structured converter based on voltage compensation

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CN117650529A (en) * 2024-01-30 2024-03-05 武汉理工大学 Method and device for suppressing subsynchronous oscillation of grid-structured converter based on voltage compensation

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