Two methods for damping torsional vibrations in DFIG-based wind generators using power converters

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Zhao, Zuyi^1 ; Lu, Yupu^1 ; Xie, Da^1 ; Yu, Songtao^1 ; Wu, Wangping^1

Shanghai Jiaotong University, Shanghai

200240, China^1

关键词: Active and Reactive Power;    Dfig-based wind generators;    Doubly Fed Induction generators (DFIG);    Energy storage systems;    Frequency fluctuation;    Operating characteristics;    Point of common coupling;    Static synchronous compensator (STATCOM);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012021/pdf
DOI  :  10.1088/1742-6596/52/1/012021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper proposes novel damping control algorithms by using static synchronous compensator (STATCOM) and energy storage system (ESS) to damp torsional vibrations in doubly fed induction generator (DFIG) based wind turbine systems. It first analyses the operating characteristics of STATCOM and ESS for regulating power variations to increase grid voltage stability. Then, new control strategies for STATCOM and ESS are introduced to damp the vibrations. It is followed by illustration of their effectiveness to damp the drive train torsional vibrations of wind turbines, which can be caused by grid disturbances, such as voltage sags and frequency fluctuations. Results suggest that STATCOM is a promising technology to mitigate the torsional vibrations caused by grid voltage sags. By contrast, the ESS connected to the point of common coupling (PCC) of wind turbine systems shows even obvious advantages because of its capability of absorbing/releasing both active and reactive power. It can thus be concluded that STATCOM is useful for stabilizing power system voltage fluctuations, and ESS is more effective both in regulating PCC voltage fluctuations and damping torsional vibrations caused by grid voltage frequency fluctuations.