Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Common-Mode Current Reduction with Synchronized PWM Strategy in Two-Inverter Air-Conditioning Systems

  • Baek, Youngjin (Department of Electrical Engineering, Kyungpook National University) ;
  • Park, Gwigeun (Home Appliance and Air Solution Control R&D Lab, LG Electronics Inc.) ;
  • Park, Dongmin (Home Appliance and Air Solution Control R&D Lab, LG Electronics Inc.) ;
  • Cha, Honnyong (School of Energy Engineering, Kyungpook National University) ;
  • Kim, Heung-Geun (Department of Electrical Engineering, Kyungpook National University)
  • Received : 2019.03.18
  • Accepted : 2019.06.21
  • Published : 2019.11.20
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Abstract

A new method for reducing the common-mode current generated by the voltage variations in a two-inverter air conditioner system by applying a synchronized pulse-width modulation (PWM) strategy is proposed. The PWM signals of the master-mode inverter are generated based on the reference voltage, while those of the slave-mode inverter are output in the opposite direction when the master-mode inverter changes its switching state. However, the slave-mode control results in a mismatch between the reference voltage and the actual output voltage that is modified by synchronized control operation. The proposed method is capable of reducing and controlling this voltage error by performing signal selection in the vector space of the slave-mode inverter, which mitigates the distortion of the phase current. The efficacy of this method in reducing conducted emissions has been validated both theoretically and experimentally.

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References

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