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Model Predictive Control of Circulating Current Suppression in Parallel-Connected Inverter-fed Motor Drive Systems

  • Kang, Shin-Won (Dept. of Electrical Engineering, Hanyang University) ;
  • Soh, Jae-Hwan (Dept. of Electrical Engineering, Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Engineering, Hanyang University)
  • Received : 2017.09.20
  • Accepted : 2018.01.16
  • Published : 2018.05.01

Abstract

Parallel three-phase voltage source inverters in a direct connection configuration are widely used to increase system power ratings. A zero-sequence circulating current can be generated according to the switching method; however, the zero-sequence circulating current not only distorts current, but also reduces the system reliability and efficiency. In this paper, a model predictive control scheme is proposed for parallel inverters to drive an interior permanent magnet synchronous motor with zero-sequence circulating current suppression. The voltage vector of the parallel inverters is derived to predict and control the torque and stator flux components. In addition, the zero-sequence circulating current is suppressed by designing the cost function without an additional current sensor and high-impedance inductor. Simulation and experimental results are presented to verify the proposed control scheme.

Acknowledgement

Grant : Human Resources Program in Energy Technology

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

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