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.
CN112751346AActive Publication Date: 2021-05-04ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Publication Date
2021-05-04

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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.
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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...

Claims

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