2Blaabjerg F,Pedersen J K,Rise S,et al.Can Soft Starters Help Save Energy[J].IEEE Industry Magazine,1997,(9/10):55-66.
3Sastry V V,Prasad M R,Sivakumar T V.Optimal Soft Starting of Voltage-controlled-fed IM Drive Based on Voltage Across Thyristor[J].IEEE Trans.on Power Electronics,1997,12(6):1041-1051.