CN108321844B - Control method of permanent magnet direct-drive wind power generation system under harmonic power grid voltage - Google Patents
Control method of permanent magnet direct-drive wind power generation system under harmonic power grid voltage Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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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
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- 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
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Abstract
The invention discloses a control method of a permanent magnet direct-drive wind power generation system under harmonic power grid voltage, which relates to the control of a network side converter and a machine side converter of the permanent magnet direct-drive wind power generation system; the control target of the network side converter is set to suppress the 6-frequency multiplication pulsating component of the total output active power and reactive power of the system; and the machine side converter adopts a vector control strategy, the difference between the average active power instruction of the stator of the permanent magnet direct-drive wind power generation system, the average reactive power of the stator and the corresponding feedback quantity is sent to a machine side converter current reference value calculation module to obtain a current reference value, and then the obtained machine side converter current reference value is transmitted to a machine side converter current inner ring control link by adopting rotor magnetic field orientation to obtain a machine side converter control voltage component. The control method improves the output power quality of the permanent magnet direct-drive wind power system, reduces the fluctuation of the direct current bus voltage, prolongs the service life of the direct current bus voltage, and reduces the operation and maintenance cost.
Description
Technical Field
The invention relates to a control method of a permanent magnet direct-drive wind power generation system under harmonic power grid voltage, aims to reduce the harm of the harmonic power grid voltage to the permanent magnet direct-drive wind power generation system and improve the output electric energy quality and grid connection stability of the permanent magnet direct-drive wind power generation system, and belongs to the field of new energy power generation.
Background
In recent years, wind energy is rapidly developed in the field of renewable energy as a green energy, and the influence of wind power quality on a power grid is more and more concerned with the increasing specific gravity of installed capacity of wind power. The permanent magnet direct-drive wind power system saves components such as an electric brush, a slip ring and a gear box, and adopts a full-power converter, so that the power generation efficiency and the operation reliability are higher, and the permanent magnet direct-drive wind power system becomes one of mainstream models of a wind power generation system. However, wind energy resources are mainly concentrated in remote areas, the connection between the wind power system and the power main network is weak, and due to the application of a large number of power electronic converter devices, load nonlinearity and other factors, harmonic pollution is inevitably brought to the power system, which seriously affects the quality of the output electric energy of the permanent magnet direct-drive wind power system. Therefore, how to improve the grid-connected electric energy quality of the permanent magnet direct-drive wind power system under the voltage of the harmonic power grid and improve the stable operation capability of the permanent magnet direct-drive wind power system is a key problem in large-scale wind power development at present. Relevant studies have been carried out by scholars at home and abroad, such as the following published documents:
(1)JunBum Kwon,Xiongfei Wang,Claus Leth Bsk,et al.Analysis ofharmoniccoupling and stability in back-to-back converter systems for wind turbinesusing harmonic state space(HSS)[C].IEEE Conversion Congress and Exposition(ECCE),Montreal,QC,2015:730-737.
(2) the resonant sliding mode control technology of a grid-connected inverter under a universe, annual honing, unbalance and harmonic power grid [ J ]. Chinese Motor engineering report, 2014, 34 (9): 1345-1352.
The document (1) systematically analyzes the harmonic current characteristic of the permanent magnet direct-drive wind power system, and proposes that a filter is additionally arranged at a grid-connected point to realize the suppression of grid-connected harmonic current of the wind power system and further improve the wind power consumption capability of the power system, but the document only analyzes a harmonic source in the permanent magnet direct-drive wind power system, does not carry out research on the operation characteristic of the permanent magnet direct-drive wind power system under the harmonic power grid voltage, and the design difficulty of a filter device is increased by the provided harmonic current suppression strategy.
Document (2) proposes an improved control strategy based on a resonant sliding mode controller based on the analysis of the operation behavior of a permanent magnet direct-drive wind power system under the condition of unbalanced grid voltage and harmonic distortion, improves the delay phenomenon caused by the traditional positive and negative sequence current separation to a certain extent, reduces the design difficulty of a proportional integral controller, effectively realizes that the output current of the permanent magnet direct-drive wind power system is balanced and has no distortion, but the fluctuation of the total output power and the direct current bus voltage is not inhibited, and influences the output power quality of a permanent magnet direct-drive wind farm and the service life of a direct current link capacitor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a control method of a permanent magnet direct-drive wind power system under harmonic power grid voltage.
The technical scheme of the invention is realized as follows:
the control method of the permanent magnet direct-drive wind power generation system under the harmonic power grid voltage is characterized by comprising the following steps of: the control method relates to the control of a network side converter and a machine side converter of a permanent magnet direct-drive wind power generation system;
(A) the control target of the permanent magnet direct-drive wind power generation system grid-side converter is set to be 6 frequency multiplication pulsating component for restraining the total output active power and reactive power of the system, and the specific control steps are as follows:
A1) collecting grid-connected point voltage signal u of permanent magnet direct-drive wind power generation systemgabcGrid-side converter output current signal igabcAnd a DC bus voltage signal Udc；
A2) The collected voltage signal u of the grid-connected point of the permanent magnet direct-drive wind power generation systemgabcObtaining the electrical angle theta of the positive sequence voltage vector of the grid-connected point of the wind power generation system after passing through the phase-locked loopgAnd synchronous electrical angular velocity ω;
A3) the collected voltage signal u of the grid-connected point of the permanent magnet direct-drive wind power generation systemgabcObtaining a voltage signal u under a αβ coordinate axis system through constant power coordinate transformation from a static three-phase abc coordinate system to a static two-phase αβ coordinate axis systemgα、ugβ；
A4) Adopting a power grid positive sequence voltage d-axis orientation mode to obtain a voltage signal u of A3)gα、ugβConstant power conversion from a static two-phase αβ coordinate axis system to a forward direction, a 5-time reverse direction and a 7-time forward direction synchronous rotation coordinate axis system is performed, and filtering is performed through a6 omega wave trap to obtain a grid voltage positive sequence fundamental wave dq axis component under harmonic grid voltage
5 th harmonic dq axis component
7 th harmonic dq axis component
A5) The collected output current signal i of the network side convertergabcObtaining the current i under the stationary two-phase αβ coordinate axis system through the constant power coordinate transformation from the stationary three-phase abc coordinate axis system to the stationary two-phase αβ coordinate axis systemgα、igβ；
A6) Subjecting the current i obtained in step A5)gα、igβConstant power conversion from a static two-phase αβ coordinate axis system to a forward direction, a 5-time reverse direction and a 7-time forward direction synchronous rotation coordinate axis system is carried out, and filtering is carried out by a6 omega wave trap to obtain a positive sequence fundamental wave dq axis component of output current of a network side converter
5 th harmonic dq axis component
7 th harmonic dq axis component
A7) The collected direct current bus voltage signal UdcAnd the positive sequence current reference value is transmitted to a grid-side converter positive sequence current reference value calculation module, and the positive sequence current reference value of the grid-side converter is determined according to the following formula:
in the formula, Kp1And τi1Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a positive sequence current reference value;
A8) using the grid voltage positive sequence fundamental wave, 5 th harmonic and 7 th harmonic dq components obtained in the step A4)
And the reference value of the positive sequence current of the network side converter obtained in the step A7)
Transmitted to a harmonic current reference value calculation module to determine the harmonic current reference value of the network side converter
As follows:
A9) respectively transmitting the current reference values of the grid-side converter obtained by the calculation in the steps A7) and A8) to a positive sequence, 5-order harmonic and 7-order harmonic current inner loop control link of the grid-side converter, and obtaining control voltage component of the grid-side converter under a forward, 5-time reverse and 7-time forward synchronous angular velocity rotation coordinate system according to the following formula
In the formula, Kp2And τi2Respectively is the proportional coefficient and the integral time constant, K, of a current inner loop PI controller in a positive sequence control system of a network side converterp3And τi3Respectively is the proportional coefficient and the integral time constant, K, of a current loop PI controller in a5 th harmonic control system of a network side converterp4And τi4Constant proportional coefficient and integral time of a current loop PI controller in a7 th harmonic control system of a network side converterNumber, LgAn incoming line reactor inductor;
A10) the control voltage obtained in the step A9)
Space vector modulation is carried out, so that a PWM driving signal of the network side converter can be obtained, and the control target of the network side converter is realized;
(B) the control steps of the machine side converter of the permanent magnet direct-drive wind power generation system are as follows:
B1) the permanent magnet direct-drive wind power generation system machine side converter adopts a vector control strategy to make the permanent magnet direct-drive wind power generation system stator average active power instruction P*Stator average reactive power Q*The difference between the current reference value and the corresponding feedback value P, Q is sent to a current reference value calculation module of the side converter to obtain a current reference value
In the formula, Kp5And τi5Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a current reference value of a machine side converter;
B2) adopting rotor magnetic field orientation, transmitting the machine side converter current reference value obtained by calculation in the step B1) to a machine side converter current inner loop control link, and obtaining a machine side converter control voltage component according to the following formula
In the formula, Kp6And τi6Proportional coefficient and integral time constant, L, of the machine side converter current inner loop PI controllersEquivalent inductance of stator side winding, omegamAs to the electrical angular velocity of the rotor,ψfis a magnetic linkage of a permanent magnet of the rotor,
respectively the machine side converter current dq axis components.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes the control target of no fluctuation of the total output active power and the total output reactive power of the permanent magnet direct-drive wind power system under the harmonic power grid voltage, improves the output electric energy quality of the permanent magnet direct-drive wind power system, reduces the voltage fluctuation of a direct-current bus, prolongs the service life of the system, reduces the operation and maintenance cost, and ensures the safe and stable operation of the permanent magnet direct-drive wind power system.
Drawings
Fig. 1 is a schematic structural diagram of a permanent magnet direct-drive wind power system connected to a power system.
Fig. 2 is a control block diagram of the permanent magnet direct-drive wind power system under the harmonic power grid voltage.
Fig. 3 is a comparison graph of simulation waveforms of the permanent magnet direct-drive wind power system when the traditional control strategy and the control method of the invention are adopted under the condition of the grid voltage with the harmonic content of 5 th and 7 th being 4% and 3% respectively.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a 30MVA permanent magnet direct-drive wind power generation system connected to a power system, and a permanent magnet direct-drive wind turbine generator is connected to a large power grid through a public connection point.
Fig. 2 shows a structural block diagram of the control method of the permanent magnet direct-drive wind power system under the harmonic power grid voltage, which comprises the following control objects: the system comprises a direct current link capacitor 1, a machine side converter 2, a network side converter 3, space vector modulation 4, a voltage sensor 5, a current sensor 6, a network side positive sequence current reference value calculating module 7, a network side harmonic current reference value calculating module 8, a network side positive sequence current control module 9, a network side harmonic current loop 10, a phase-locked loop (PLL)11, a machine side converter current reference value calculating module 12 and a machine side converter current inner loop control link 13.
The method comprises the following specific implementation steps:
(A) the control target of the permanent magnet direct-drive wind power system grid-side converter is set to be 6 frequency multiplication pulsating component for restraining the total output active power and reactive power of the system, and the specific control steps are as follows:
A1) voltage sensor 5 is utilized to collect voltage signal u of grid-connected point of wind power systemgabcAnd a DC bus voltage signal UdcCollecting output current signal i of the grid-side converter by using a current sensor 6gabc；
A2) Collected wind power system grid-connected point voltage signal ugabcObtaining the proper electric angle theta of the positive sequence voltage of the grid-connected point of the wind power system after passing through a digital phase-locked loop (PLL)11gAnd synchronous electrical angular velocity ω;
A3) direct-drive permanent magnet wind power generation system grid-connected point voltage signal ugabcObtaining a voltage signal u under a αβ coordinate axis system through constant power coordinate transformation from a static three-phase abc coordinate system to a static two-phase αβ coordinate axis systemgα、ugβ；
A4) Adopting a power grid positive sequence voltage d-axis orientation mode, carrying out constant power conversion on a voltage signal obtained by A3) from a stationary two-phase αβ coordinate axis system to a forward direction synchronous rotating coordinate axis system, a 5-time reverse direction synchronous rotating coordinate axis system and a 7-time forward direction synchronous rotating coordinate axis system, and filtering by a6 omega wave trap to obtain a power grid voltage positive sequence fundamental wave dq-axis component under harmonic power grid voltage
5 th harmonic dq axis component
7 th harmonic dq axis component
A5) Collecting current signal i of network side convertergabcObtaining the current i under the stationary two-phase αβ coordinate axis system through the constant power coordinate transformation from the stationary three-phase abc coordinate axis system to the stationary two-phase αβ coordinate axis systemgα、igβ；
A6) The output current i obtained in the step A5)gα、igβConstant power conversion from a static two-phase αβ coordinate axis system to a forward direction, a 5-time reverse direction and a 7-time forward direction synchronous rotation coordinate axis system is carried out, and filtering is carried out by a6 omega wave trap to obtain a positive sequence fundamental wave dq axis component of output current of a network side converter
5 th harmonic dq axis component
7 th harmonic dq axis component
A7) The collected direct current bus voltage signal UdcThe current is transmitted to a network side positive sequence current reference value calculating module 7, and the network side converter positive sequence current reference value can be determined according to the following formula:
in the formula, Kp1And τi1Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a positive sequence current reference value;
A8) the grid voltage positive sequence fundamental wave, 5 th harmonic and 7 th harmonic dq components obtained in the steps A4) and A7)
And a grid-side converter positive sequence current reference value
The harmonic current reference value is transmitted to a network side harmonic current reference value calculation module 8 to determine the harmonic current reference value of the network side converter
As follows:
A9) respectively transmitting the current reference values of the grid-side converter calculated in the steps A7) and A8) to a grid-side positive sequence current control module 9 and a grid-side harmonic current loop 10, and obtaining control voltage components of the grid-side converter under the control of a forward synchronous angular velocity rotation coordinate system, a 5-fold reverse synchronous angular velocity rotation coordinate system and a 7-fold forward synchronous angular velocity rotation coordinate system according to the following formula
In the formula, Kp2And τi2Respectively is the proportional coefficient and the integral time constant, K, of a current inner loop PI controller in a positive sequence control system of a network side converterp3And τi3Respectively is the proportional coefficient and the integral time constant, K, of a current loop PI controller in a5 th harmonic control system of a network side converterp4And τi4Respectively is a proportional coefficient and an integral time constant, L of a current loop PI controller in a7 th harmonic control system of the network side convertergAn incoming line reactor inductor;
A10) the control voltage obtained in the step A9)
Space vector modulation 4 is carried out, so that a PWM driving signal of the network side converter can be obtained, and the control target of the network side converter is realized;
(B) the control steps of the machine side converter of the permanent magnet direct-drive wind power system are as follows:
B1) the machine side converter of the permanent magnet direct-drive wind power system adopts a vector control strategy, and is consistent with a control strategy under an ideal power grid condition. Directly driving the average active power instruction P of the wind power system by the permanent magnet*Average reactive power Q*The difference between the feedback value P, Q and the current reference value is sent to the current reference value calculation module 12 of the side converter to obtain the current reference value
In the formula, Kp5And τi5Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a current reference value of a machine side converter;
B2) adopting rotor magnetic field orientation, transmitting the current reference value of the machine side converter obtained by calculation in the step B1) to a machine side converter current inner ring control link 13, and obtaining a machine side converter control voltage component according to the following formula
In the formula, Kp6And τi6Proportional coefficient and integral time constant, L, of the machine side converter current inner loop PI controllersEquivalent inductance of stator side winding, omegamFor the electrical angular velocity, psi, of the rotorfIs a magnetic linkage of a permanent magnet of the rotor,
respectively the machine side converter current dq axis components.
Step a10) implementation results constitute the control objective of the present invention.
Description of the effects of the invention:
fig. 3 shows a comparison graph of simulation waveforms of the permanent magnet direct-drive wind power system when the conventional control strategy and the control method of the present invention are adopted under the condition of the grid voltage with the harmonic content of 5 th and 7 th being 4% and 3%, respectively. U shapeabcIs a permanent magnet direct-drive wind power generation system grid-connected point three-phase voltage UdcFor the direct current bus voltage, P, Q is the active power and the reactive power output by the permanent magnet direct-drive wind power system respectively, Id、IqAnd outputting current dq axis components for the permanent magnet direct-drive wind power system. In the figure, 1.0 s-1.1 s are simulation oscillograms when a traditional control strategy is adopted, and it can be seen from the figure that the output active power, the reactive power, the direct current bus voltage and the output current of the permanent magnet direct-drive wind power system all contain 6-frequency-doubled pulsating components, so that the output electric energy quality of a permanent magnet direct-drive wind field and the service life of a direct current link capacitor are influenced, and the grid connection stability of the permanent magnet direct-drive wind field is reduced; 1.1 s-1.3 s in the figure are simulation oscillograms when the control strategy provided by the invention is added, and as can be seen from the figure, under the condition of harmonic power grid voltage, by adding a harmonic auxiliary control link at the grid side, the 6 frequency multiplication pulsation of the output active power, the reactive power and the direct current bus voltage of the permanent magnet direct-drive wind power system is effectively eliminated, and the safe and stable operation level of the permanent magnet direct-drive wind power system under the harmonic power grid voltage is improved.
In summary, the control method of the permanent magnet direct-drive wind power generation system under the harmonic power grid voltage can realize the non-grid-disconnection operation of the permanent magnet direct-drive wind power generation system under the harmonic power grid voltage, and has the following advantages: 1) the voltage fluctuation of a direct-current bus of the permanent-magnet direct-drive wind power generation system under the voltage of the harmonic power grid is obviously inhibited, the service life of a direct-current link capacitor is effectively prolonged, and the operation and maintenance cost is reduced; 2) the pulsation of active power and reactive power output by the permanent magnet direct-drive wind power system under the harmonic power grid voltage is obviously inhibited, the quality of electric energy output by the system is improved, and the operation stability of the double-fed wind power system under the harmonic power grid condition is effectively enhanced.
Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it will be apparent to those skilled in the art that other variations and modifications can be made based on the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (1)
1. The control method of the permanent magnet direct-drive wind power generation system under the harmonic power grid voltage is characterized by comprising the following steps of: the control method relates to the control of a network side converter and a machine side converter of a permanent magnet direct-drive wind power generation system;
(A) the control target of the permanent magnet direct-drive wind power generation system grid-side converter is set to be 6 frequency multiplication pulsating component for restraining the total output active power and reactive power of the system, and the specific control steps are as follows:
A1) collecting grid-connected point voltage signal u of permanent magnet direct-drive wind power generation systemgabcGrid-side converter output current signal igabcAnd a DC bus voltage signal Udc；
A2) The collected voltage signal u of the grid-connected point of the permanent magnet direct-drive wind power generation systemgabcObtaining the electrical angle theta of the positive sequence voltage vector of the grid-connected point of the wind power generation system after passing through the phase-locked loopgAnd synchronous electrical angular velocity ω;
A3) the collected voltage signal u of the grid-connected point of the permanent magnet direct-drive wind power generation systemgabcObtaining a voltage signal u under a αβ coordinate axis system through constant power conversion from a static three-phase abc coordinate system to a static two-phase αβ coordinate axis systemgα、ugβ；
A4) Adopting a power grid positive sequence voltage d-axis orientation mode to obtain a voltage signal u of A3)gα、ugβConstant power conversion from a static two-phase αβ coordinate axis system to a forward direction, a 5-time reverse direction and a 7-time forward direction synchronous rotation coordinate axis system is performed, and filtering is performed through a6 omega wave trap to obtain a grid voltage positive sequence fundamental wave dq axis component under harmonic grid voltage
5 th harmonic dq axis component
7 th harmonic dq axis component
A5) The collected output current signal i of the network side convertergabcObtaining the current i under the stationary two-phase αβ coordinate axis system through the constant power conversion from the stationary three-phase abc coordinate axis system to the stationary two-phase αβ coordinate axis systemgα、igβ；
A6) Subjecting the current i obtained in step A5)gα、igβConstant power conversion from a static two-phase αβ coordinate axis system to a forward direction, a 5-time reverse direction and a 7-time forward direction synchronous rotation coordinate axis system is carried out, and filtering is carried out by a6 omega wave trap to obtain a positive sequence fundamental wave dq axis component of output current of a network side converter
5 th harmonic dq axis component
7 th harmonic dq axis component
A7) The collected direct current bus voltage signal UdcAnd the positive sequence current reference value is transmitted to a grid-side converter positive sequence current reference value calculation module, and the positive sequence current reference value of the grid-side converter is determined according to the following formula:
in the formula, Kp1And τi1Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a positive sequence current reference value;
A8) using the grid voltage positive sequence fundamental wave, 5 th harmonic and 7 th harmonic dq components obtained in the step A4)
And step A7) obtainingThe grid side converter positive sequence current reference value
Transmitted to a harmonic current reference value calculation module to determine the harmonic current reference value of the network side converter
As follows:
A9) respectively transmitting the current reference values of the grid-side converter obtained by calculation in the steps A7) and A8) to a current inner loop control link of a positive sequence, a5 th harmonic and a7 th harmonic of the grid-side converter, and obtaining control voltage components of the grid-side converter under a synchronous rotating coordinate axis system in the forward direction, the 5 times reverse direction and the 7 times forward direction according to the following formula
In the formula, Kp2And τi2Respectively is the proportional coefficient and the integral time constant, K, of a current inner loop PI controller in a positive sequence control system of a network side converterp3And τi3Respectively is the proportional coefficient and the integral time constant, K, of a current loop PI controller in a5 th harmonic control system of a network side converterp4And τi4Respectively is a proportional coefficient and an integral time constant, L of a current loop PI controller in a7 th harmonic control system of the network side convertergAn incoming line reactor inductor;
A10) the control voltage component obtained in the step A9)
Space vector modulation is carried out, namely, a PWM driving signal of a network side converter is obtained, and network side conversion is realizedA translator control target;
(B) the control steps of the machine side converter of the permanent magnet direct-drive wind power generation system are as follows:
B1) the permanent magnet direct-drive wind power generation system machine side converter adopts a vector control strategy to make the permanent magnet direct-drive wind power generation system stator average active power instruction P*Stator average reactive power Q*The difference between the current reference value and the corresponding feedback value P, Q is sent to a current reference value calculation module of the side converter to obtain a current reference value
In the formula, Kp5And τi5Respectively calculating a proportional coefficient and an integral time constant of a PI controller of a module for calculating a current reference value of a machine side converter;
B2) adopting rotor magnetic field orientation, transmitting the machine side converter current reference value obtained by calculation in the step B1) to a machine side converter current inner loop control link, and obtaining a machine side converter control voltage component according to the following formula
In the formula, Kp6And τi6Proportional coefficient and integral time constant, L, of the machine side converter current inner loop PI controllersEquivalent inductance of stator side winding, omegamFor the electrical angular velocity, psi, of the rotorfIs a magnetic linkage of a permanent magnet of the rotor,
respectively the machine side converter current dq axis components.
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| CN109378836A (en) * | 2018-11-21 | 2019-02-22 | 中国石油大学(华东) | A kind of control method for coordinating of direct drive permanent magnetic synchronous generator under uneven and harmonic |
| CN109742798A (en) * | 2019-01-23 | 2019-05-10 | 重庆大学 | The multi-objective coordinated control method of wind power plant is mixed under a kind of harmonic voltage |
| CN112383085B (en) * | 2020-10-21 | 2022-08-19 | 国网山东省电力公司电力科学研究院 | Control method for permanent magnet direct-drive wind power generation system grid-side converter |
| CN113300407B (en) * | 2021-06-11 | 2022-03-22 | 南通大学 | Voltage source control method of LCL type grid-connected converter |
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| CN102201770A (en) * | 2011-05-30 | 2011-09-28 | 重庆大学 | Method for injecting harmonic voltage to restrain harmonic current of PMSM (permanent magnet synchronous motor) |
| CN103545845A (en) * | 2013-11-06 | 2014-01-29 | 重庆大学 | Control method of double-fed induction wind power system for restraining grid-connected power fluctuation under condition of voltage harmonic of power grid |
| CN103997064A (en) * | 2014-06-03 | 2014-08-20 | 重庆大学 | Method for restraining total output active power fluctuation of double-fed wind power system under unbalanced and harmonic distortion network voltage |
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| CN102201770A (en) * | 2011-05-30 | 2011-09-28 | 重庆大学 | Method for injecting harmonic voltage to restrain harmonic current of PMSM (permanent magnet synchronous motor) |
| CN103545845A (en) * | 2013-11-06 | 2014-01-29 | 重庆大学 | Control method of double-fed induction wind power system for restraining grid-connected power fluctuation under condition of voltage harmonic of power grid |
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