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A New Active Zero State PWM Algorithm for Reducing the Number of Switchings

  • Yun, Sang-Won (School of Electrical Engineering, Korea University) ;
  • Baik, Jae-Hyuk (School of Electrical Engineering, Korea University) ;
  • Kim, Dong-Sik (Department of Electrical Engineering, Soonchunhyang University) ;
  • Yoo, Ji-Yoon (School of Electrical Engineering, Korea University)
  • Received : 2016.03.15
  • Accepted : 2016.09.20
  • Published : 2017.01.20

Abstract

To reduce common-mode voltage (CMV), various reduced CMV pulse width modulation (RCMV-PWM) algorithms have been proposed, including active zero state PWM (AZSPWM) algorithms, remote state PWM (RSPWM) algorithms, and near state PWM (NSPWM) algorithms. Among these algorithms, AZSPWM algorithms can reduce CMV, but they increase the number of switchings compared to the conventional space vector PWM (CSVPWM). This paper presents a new AZSPWM algorithm for reductions in both the CMV and total number of switchings in BLAC motor drives. Since the proposed AZSPWM algorithm uses only active voltage vectors for motor control, it reduces CMV by 1/3 compared to CSVPWM. The proposed AZSPWM algorithm also reduces the total number of switchings compared to existing AZSPWM algorithms by eliminating the switchings required from one sector to the next. The performance of the proposed algorithm is verified by analyses, simulations, and experimental results.

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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