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Design method of DFIG-PSS controller based on virtual impedance

A DFIG-PSS, virtual impedance technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., to achieve system stability improvement, good step response characteristics, and obvious effects.

Active Publication Date: 2021-05-04
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

[0006]Aiming at the deficiencies in the above-mentioned background technology, the present invention proposes a DFIG-PSS controller design method based on virtual impedance, which solves the problems existing in the existing wind power system Technical Problems of Low Frequency Oscillation

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  • Design method of DFIG-PSS controller based on virtual impedance
  • Design method of DFIG-PSS controller based on virtual impedance
  • Design method of DFIG-PSS controller based on virtual impedance

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Embodiment Construction

[0043]Next, the technical solutions in the embodiments of the present invention will be apparent from the embodiment of the present invention, and it is clearly described, and it is understood that the described embodiments are merely embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art will belong to the scope of the present invention without paying in the premise of creative labor.

[0044]Virtual impedance is a control method that introduces a feedback circuit in the control loop to simulate the actual line impedance. The realization method of virtual impedance is flexible. When the controller output impedance or the line impedance, it can introduce a virtual impedance to compensate. By selecting a reasonable virtual impedance zvi , Output impedance z of PSSOI Composition of new output impedance ZiFurther, the nature of the system impedance is changed to improve the purpose of improvin...

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Abstract

The invention provides a design method of a DFIG-PSS controller based on virtual impedance, and the method comprises the steps: constructing a power grid system containing a doubly-fed induction motor model, combining a power system stabilizer with virtual impedance, and then connecting the combined power system stabilizer and virtual impedance to a rotor side converter, obtaining the relation between the output voltage of the rotor side converter and the rotor current by adopting a stator flux linkage directional vector control technology; obtaining the relation between the stator current and the output power of the stator according to the relation among the stator voltage, the electron flux linkage and the electron current; then, according to the relationship between the output voltage of the rotor side converter and the rotor current and the relationship between the stator current and the output power of the stator, obtaining the relationship between the parameter of the power system stabilizer-virtual impedance and the output power of the stator; and finally, adjusting the output power of the stator by changing the parameters of the stabilizer-virtual impedance of the power system, thereby influencing the damping characteristic of the power grid system. The low-frequency oscillation characteristic of the wind power system can be improved.

Description

Technical field[0001]The present invention relates to the technical field of wind power systems, in particular to a DFIG-PSS controller design method based on a virtual impedance.Background technique[0002]The large-scale wind turbine has brought new challenges to power system stabilization, and the wind turbines such as the Double Fed Induction Generator (DFIG) will affect the original oscillation mode of the system and may introduce new oscillation mode. The dynamic stability of the system is particularly adverse effects in small interference stability. Traditional synchronous generators Adopt Power System Stabilizer, PSS, providing additional damping during the system being disturbed, improves system low frequency oscillation characteristics. As the wind power penetration increases, the grid requires the wind power unit to provide damping to the power system, which is critical to the additional damping control strategy of traditional synchronous generators.[0003]In recent years, l...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241H02J2203/20Y02E10/76
Inventor 和萍李从善李凯章岳啸鸣郑明明和艳萍李钊陶玉昆赵琛谢伟李凌政程寅超丁浩川
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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