Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Average Current Control for Parallel Connected Converters

  • Jassim, Bassim M.H. (Department of Electrical Engineering, University of Baghdad) ;
  • Zahawi, Bashar (Department of Electrical Engineering and Computer Science, Khalifa University) ;
  • Atkinson, David J. (School of Engineering, Newcastle University)
  • Received : 2018.12.26
  • Accepted : 2019.05.18
  • Published : 2019.09.20
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Abstract

A current sharing controller is proposed in this paper for parallel-connected converters. The proposed controller is based on the calculation of the magnitudes of system current space vectors. Good current distribution between parallel converters is achieved with only one Proportional-Integral (PI) compensator. The proposed controller is analyzed and the circulating current impedance is derived for paralleled systems. The performance of the new control strategy is experimentally verified using two parallel connected converters employing Space Vector Pulse Width Modulation (SVPWM) feeding a passive RL load and a 2.2 kW three-phase induction motor load. The obtained test results show a reduction in the current imbalance ratio between the converters in the experimental setup from 53.9% to only 0.2% with the induction motor load.

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References

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