supplementary controller design for ssr damping in a series-compensated dfig-based wind farm补充的ssr阻尼控制器设计串联补偿dfig-based风电场.pdf

Energies 2012, 5, 4481-4496; doi:10.3390/en5114481 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article Supplementary Controller Design for SSR Damping in a Series-Compensated DFIG-Based Wind Farm Zaijun Wu *, Chanxia Zhu and Minqiang Hu School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing, Jiangsu 210096, China; E-Mails: iyizcx@163.com (C.Z.); mqhu@ (M.H.) * Author to whom correspondence should be addressed; E-Mail: zjwu@; Tel.: +86-25(ext. 602); Fax: +86-25 Received: 6 September 2012; in revised form: 29 October 2012 / Accepted: 7 November 2012 / Published: 13 November 2012 Abstract: The increasing presence of wind power in power systems will likely drive the integration of large wind farms with electrical networks that are series-compensated to sustain large power flows. This may potentially lead to subsynchronous resonance (SSR) issues. In this paper, a supplementary controller on the grid-side converter (GSC) control loop is designed to mitigate SSR for wind power systems based on doubly fed induction generators (DFIGs) with back-to-back converters. Different supplementary controller feedback signals and modulated-voltage injecting points are proposed and compared based on modal analysis and verified through root locus analysis to identify the optimal feedback signal and the most effective control location for SSR damping. The validity and effectiveness of the proposed supplemental contro