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FCEV 구동용 DC-DC 컨버터 가변 DC-link 전압 제어에 의한 PWM 인버터의 전류 왜곡 저감
고안열(An-Yeol Ko),김도윤(Do-Yun Kim),이정효(Jung-Hyo Lee),김영렬(Young-Real Kim),원충연(Chung-Yuen Won) 전력전자학회 2014 전력전자학회 논문지 Vol.19 No.6
A design and control method of DC/DC converter, which can control variable DC-link voltage to drive a fuel cell electric vehicle (FCEV), is proposed in this study. Given that a fuel cell has low-voltage and high-current characteristics, the required voltage for operating motor must be output through the DC/DC boost converter in the system to drive an FCEV. The proposed converter can choose the output voltage of battery or fuel cell in consideration of the driving mode, as well as control DC-link voltage in accordance with the back electromotive force. The switching lag-time to prevent shortage of pulse-width modulation inverter arms makes distorted current waveform caused by voltage distortion. Through this control method, the proposed converter can reduce the output voltage distortion and current ripple of the inverter, thereby reducing the distorted torque. Simulations and experimental results are presented to verify the reliability of the proposed DC/DC converter.