A novel VAR regulation strategy of DFIG to prevent voltage dip of wind power plant

This paper proposes a VAR regulation strategy when voltage of monitor bus fluctuates or drops severely. If voltage of monitor bus fluctuates and the CrowBar does not response, rotor side converter will change VAR output of DFIG by regulation strategy while the converter of grid side can only keep DC voltage stability. When severe grid fault occurs and CrowBar acts, rotor side converter is out of control. In this case grid side converter is forced to output VAR with set value. DFIG gives maximum VAR support to monitor bus. Simulation shows this strategy can restrain voltage fluctuates and can give VAR support to monitor bus when serious fault occurs.