Mitigating Thermal Power’s SSR by Additional Damping Controller of DFIG

doi:10.11930/j.issn.1004-9649.2013.4.63.5

Abstract

Abstract: Combined power delivery from thermal and wind power bases is the practical needs in China. Series compensators are usually installed in transmission channels to improve the capability of the delivery system, but may cause sub-synchronous resonance (SSR) on the thermal power units at the sending end. In order to solve the problem, the impact of wind power integration on the nearby thermal power units’ SSR is analyzed quantitatively by time-domain simulation and Prony damping ratio identification, in which the IEEE SSR first benchmark modified model with a wind farm is used, and an additional damping controller of wind turbine is designed according to principles of phase compensation, which can provide positive damping in sub-frequency domain and eliminate SSR by adjusting its reactive power dynamically. In the meanwhile, the active power outputs of doubly-fed induction generators (DFIGs) are improbably affected due to their decoupling control functions. The simulation results show that this control strategy can improve dynamic characteristics of combined power delivery system of high capacity with series compensation and increase the trans-region absorbing capacity of large scale wind power.

Key words: wind and thermal power combined system, doubly-fed induction generator(DFIG), series compensation, sub-synchronous resonance (SSR), additional damping controller

CLC Number:

TM73

LEI Hong-yun, ZHENG Chao, YUE Xing-hua, XU Guang-nian, BAO Jian-fei. Mitigating Thermal Power’s SSR by Additional Damping Controller of DFIG[J]. Electric Power, 2013, 46(4): 63-68.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.4.63.5

https://www.electricpower.com.cn/EN/Y2013/V46/I4/63

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