This　paper　analyses　and　compares　domestic　and　international　grid　codes,　which　define　the　requirements　on　the　wind　turbine　control　and　objectives.　The　focuses　are　on　the　topologies　of　asynchronous　doubly-fed　induction　generator　(DFIG)　and　multi-pole　permanent　magnet　direct-drive　synchronous　generator　(PMSG),　as　well　as　their　control　schemes　aimed　at　MPPT.　A　summary　and　comparison　of　control　schemes　is　made.　The　control　schemes　in　the　LVRT　situation　of　VSCF　wind　turbines　and　the　protective　measures　are　illuminated.　The　paper　also　stresses　the　PMSG　control　scheme　and　the　protective　measures.　In　the　end　of　this　paper,　a　brief　description　of　the　present　research　situation　on　wind　turbines　to　improve　power　quality,　frequency　regulation　capability　as　control　objective　is　given,　and　fractional　frequency　wind　power　system　with　fractional　frequency　transmission　technology　is　discussed.　©2010　State　Grid　Electric　Power　Research　Institute　Press.