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《Power System Protection and Control》 2009-21
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Protection strategy of DFIG under grid voltage narrow dip

CAI Zhi,LIU Jian-zheng,MEI Hong-ming,WANG Jian,LIU Shu (State Key Lab of Power Systems,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)  
A protection strategy to limit the converter step current and voltage of doubly-fed induction generator (DFIG) during a grid voltage dip is proposed. Traditional DFIG control schemes consider grid voltage to be ideal unchanged to simplify the design of rotor controller. When the grid falls,the converter may suffer from the rotor step overcurrents and overvoltages in DC-links. In order to enhance the dynamic stability of DFIG,both the rotor excitation control method and DC-link voltage control method are improved in this protection strategy. To realize the protection capability better,off-load circuit to limit the DC-link voltage are used. The correctness and validity of this protection strategy has been verified by simulation results on a 1.5MW DFIG riding through voltage dip.
【CateGory Index】: TM315
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