PMSM low voltage ride through based on Coordinated Control Strategy

Based on the analysis of operation characteristics fault direct-drive permanent magnet wind turbine and existing protection strategies, in order to improve low-voltage capability turbine, a new coordinated control strategy for crossing is proposed this paper, which includes DC brake system unloading circuit, double second-order generalized integral phase-locked control, extracting positive negative sequence grid voltage reactive power side. common three-phase symmetrical drop asymmetrical caused by single grounding short circuit grid, PASCAD simulation experiment conducted verify low traversing ability turbine.