Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Compensation method of PWM inverter output voltage under low sampling-to-fundamental frequency ratio operating conditions

  • Su‑In Jo (Department of Electrical Engineering, Chungnam National University) ;
  • Wook‑Jin Lee (Department of Electrical Engineering, Chungnam National University)
  • Received : 2022.10.03
  • Accepted : 2023.04.04
  • Published : 2023.06.20
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Abstract

This paper proposed a compensation method for the output voltage errors of a PWM inverter. Output voltage errors occur under low sampling-to-fundamental frequency ratio operating conditions, and they can be compensated by calculating a switching timing in which the average of the output voltage during one sampling period is equal to the voltage reference. The proposed compensation method for output voltage errors was described according to the PWM method and the voltage update method, and it was verifed by simulation and experimental results. It was confrmed that a lower sampling-to-fundamental frequency ratio results in a larger output voltage error. In addition, it was also confrmed that the proposed compensation method can completely remove these errors.

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References

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