Comparative Study and Optimal Design of Subsynchronous Damping Controller in Doubly Fed Induction Generator

Song Xiang, Peng Su, Xiaodan Wu, Hanlu Yang () and Chaoqun Wang
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Song Xiang: State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010010, China
Peng Su: State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010010, China
Xiaodan Wu: State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010010, China
Hanlu Yang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Chaoqun Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Sustainability, 2022, vol. 14, issue 20, 1-18

Abstract: The subsynchronous damping controller (SSDC) has been widely recognized for its excellent performance and low cost in subsynchronous oscillation (SSO) mitigation for the doubly fed induction generator (DFIG)-based wind power system. However, the existing SSDCs are various and lack a systematic comparison. To fill this gap, the structures and parameter design methods of common SSDCs are sorted and compared in this paper. It is found that the rotor-current-based method performs best in terms of dynamic performance and robustness, as it can mitigate SSO for all working conditions in the test, while the feasibility range of other methods is much smaller. Therefore, the influence of different parameters in a rotor-current-based SSDC on SSO mitigation is further researched, leading to a guideline for parameter selection. More importantly, to address the challenge of time-varying oscillation frequency, an adaptive frequency selection method is proposed based on the eigensystem realization algorithm, which can accurately track the SSO frequency within 5~45 Hz. The results of the root locus analysis and hardware-in-the-loop experiment demonstrate that the improved rotor-current-based SSDC performs better than other existing methods, and it does not affect the normal operation of the DFIG.

Keywords: subsynchronous oscillation; subsynchronous damping controller; subsynchronous oscillation mitigation; doubly fed induction generator (DFIG); SSO parameter identification (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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