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Design and Control of DC/AC Converters in Parallel with Diode Rectifiers for Regenerative Applications

  • Gao, Zhigang (School of Automation, Beijing Institute of Technology) ;
  • Li, Rui (School of Automation, Beijing Institute of Technology) ;
  • Lu, Qi (School of Automation, Beijing Institute of Technology)
  • Received : 2016.12.06
  • Accepted : 2017.03.15
  • Published : 2017.07.20

Abstract

This paper introduces a DC/AC converter, which can be connected in parallel with a diode rectifier for regenerative applications. The DC/AC converter is supposed to transmit regenerative energy to the power grid when a motor is braking. Isolation transformers are not needed in the topology, which can reduce the size and cost. An analysis of the zero-order current existing in the system is carried out. In addition, algorithms to minimize the zero-order current, control the power factor and keep the DC bus voltage stable are discussed. A 55kW industrial prototype is built to verify the proposed analysis and control strategies.

Acknowledgement

Supported by : National Natural Science Foundation of China

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