Abstract：This paper investigates the low voltage ride through (LVRT) techniques for hybrid wind farms with double fed induction generators (DFIG) and direct-driven permanent-magnet synchronous generators (PMSG).Based on the deduced reactive current limit expressions of DFIG and PMSG,the impacts of voltage dip degree and wind speed on the reactive current limits are analyzed in detail.The controllable operation regions and currents allocation principles of DFIG and PMSG are obtained accordingly to meet the grid code LVRT requirements.Based on the proposed controllable operation regions,a coordinated control strategy for hybrid wind farms without intercommunication is proposed.With the proposed strategy,the hybrid wind farms can deliver the maximum reactive currents to enhance the transient grid voltage level under symmetrical grid faults;and the change of the output active powers before and after grid faults can be reduced to avoid generators’ over speed.Consequently,the LVRT performance of hybrid wind farms under all operation conditions can be significantly improved.Finally,the simulation results verify the validity of the proposed coordinated control strategy.
姚 骏 ,余梦婷,陈知前 ,周 特 ,赵 磊. 电网对称故障下含DFIG和PMSG的混合风电场群的协同控制策略[J]. 电工技术学报, 2015, 30(15): 26-36.
Yao Jun, Yu Mengting ,Chen Zhiqian, Zhou Te ,Zhao Lei. Coordinated Control Strategy for Hybrid Wind Farms with DFIG and PMSG Under Symmetrical Grid Faults. Transactions of China Electrotechnical Society, 2015, 30(15): 26-36.
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2015, Vol. 30 
