Grid Fault Ride‐Through Of DFIG

This chapter introduces the commonly used fault ride‐through strategies for the doubly fed induction generator (DFIG) wind power generation system (WPS), which include the improved control strategies and also new enhanced hardware solutions. The improved control strategies normally use software changes in order to apply the methods, for realizing the fault ride through (FRT) of the DFIG, while enhanced hardware solutions use additional circuits to assist the DFIG WPS to withstand the voltage dips. An accurate grid synchronous is a prerequisite of the control under grid faults, and this is typically done by a phase lock loop (PLL) like a synchronization reference frame PLL. Many kinds of hardware solutions have been applied or analyzed for the DFIG. The chapter introduces four typical hardware solutions, including the rotor‐side crowbar, DC choppers, stator/rotor breaking resistance, and the dynamic voltage restorer (DVR).

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