Method of DFIG Cooperating with SVG to Suppress Low-Frequency Oscillation in Power Systems

doi:10.11930/j.issn.1004-9649.201912045

Abstract

Abstract: With the increasing penetration of wind power, when the power system is insufficiently damped, low-frequency oscillations are likely to occur. Doubly fed induction generation (DFIG) can decouple the control of active and reactive power, which helps enhance system damping. This paper proposes a method for grid connection of DFIG units with static var generator (SVG). It adopts a control strategy of additional damping, accesses the power control node of the control system, changes the active and reactive reference current of the device, and realizes the dynamic output power of the device to offset the power increase to suppress the power oscillations in the system. The control system model of DFIG and SVG connected to 4-machine 2-area system is built. Additional damping control signals are added to control the active power of DFIG and the reactive power of SVG. The characteristic root of the system is changed, and the modalities of the oscillating signals are analyzed based on Prony method. The results show that the method can effectively provide positive damping, suppress low-frequency oscillation of the system, accelerate the stabilization of oscillation waveform and improve the small signal stability of the power system.

Key words: DFIG, SVG, low frequency oscillation, additional damping control, control strategy

YANG Lei, GAN Weigong, LI Shengnan, ZHOU Xin, HE Peng, HE Xin, ZHANG Jie, WANG Delin. Method of DFIG Cooperating with SVG to Suppress Low-Frequency Oscillation in Power Systems[J]. Electric Power, 2020, 53(11): 175-184,201.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201912045

https://www.electricpower.com.cn/EN/Y2020/V53/I11/175

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