Analyse And Improve Power Quality Of Wind Generators During Network Unbalanced

Different from other traditional power energy,wind power has many especial characteristics. Nowadays, there have been widely used for large-scale WGS(wind generation systems) in many areas, this will cause poor power quality and poor operation performance of the power systems.The influences between wind farm which composed by DFIG and PMSG with power systems will discussed based wind generation systems under unbalanced voltage conditions.First,the equivalent circuit of DFIG and PMSG will recommended.Second, in allusion to these two WGS,the operating performance and components connected to system analysed during network voltage unbalance,and carried on the simulation confirmation in software DIgSILENT/PowerFactory.Then the influences between wind farm and power systems should be discussed.Based practicality engineering background,combined with the operating performance of the WGS,got the evaluation not only from steady power quality analyse,but also through instantaneous power theory under this unnormally conditions.Provide the appropriate control theory and strategy in using SVC improving unnormally conditions during this unbalanced voltage conditions.Other ways to improving unnormally conditions are also mentioned.Summarize foregoing conclusion,consult large wind farm in earlier programming,supply reference for rear scientific research.