Phase Current Measurement Method of Dual Inverter-Motor Drive System Using a Single DC Link Current Sensor

Seon-Ik Hwang, Seong-Hyeon Cho, Jun-Hyung Jung and Jang-Mok Kim
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Seon-Ik Hwang: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea
Seong-Hyeon Cho: Advanced Electricfication Engineering Design Team, Hyundai Motor Company, Hwaseong 18280, Korea
Jun-Hyung Jung: Chair of Power Electronics, Kiel University, 24143 Kiel, Germany
Jang-Mok Kim: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2021, vol. 14, issue 18, 1-19

Abstract: In recent years, electric propulsion systems have become widely, used and these systems have strict limits in volume and weight. Therefore, it is necessary to reduce the weight of the inverter-motor drive system. In a typical n inverter-motor drive system, at least 2 n phase current sensors are required. In order to reduce the number of phase current sensors, this paper proposes a method for measuring phase current using n DC link current sensors in a 2 n inverter-motor drive system. Two phase currents per inverter-motor system are measured during one period of the switching frequency using the pulse width modulation (PWM) shift method. However, since the measured phase current contains an error component in the average current, the error component was compensated for in order to obtain a current similar to the actual phase current by using the slope and dwell time of the phase current. The effectiveness of the proposed method is verified through experiments.

Keywords: dual inverter-motor drive; single DC link current; current reconstruction; PWM shift; SVPWM (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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