Research on the LVRT of DFIG´s wind power generation with experimental demonstration system

This paper introduces the verification experiment on the LVRT capability of wind power generation system in la boratory environment. A new LVRT system is designed in which contains chopper and crowbar subsystem, by adopting the IGBT-based fast switches instead of half-controlled thyristor, to realize the wind power generation system ride through when voltage dip happens. Based on the DSP & CPLD control system platform, a novel control strategy is proposed to achieve the fast detection of voltage dip, efficient separation of positive and negative voltage component, soft excitation of DFIG´s rotor. A 30kW prototype DFIG system is built to verify the topology design and corresponding control strategy of LVRT system, for demonstration of realization and stability.