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3-level인버터를 이용한 과변조영역에서의 간접벡터 유도전동기 구동
이재문(Jaemoon Lee),정헌선(Junghun Sun),노세진(Sejin Nho),이은규(Eunkyu Lee),염상구(Sangkyu Yeum),최재호(Jaeho Choi) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper presents the over-modulation strategy and indirect vector control drive of NPC type PWM inverter. NPC inverter has three level phase voltage output.It can perform in high voltage through assembling switching components. It has less harmonics and surge voltage stress at motor terminals than the 2 level inverter in same switching frequency through 3 level voltage. The conventional railway vehicle has used the vector control to MI=0.907 and the slip-frequency control from MI=0.907 to six-step mode. The slip-frequency control has bad motive power and slow torque control response. But vector control has good motive power and can instant torque control. In this paper, output voltage is controlled linearly from linear region to six-step mode by using over-modulation strategy. And NPC inverter is used.