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SUN Longting,ZHANG Yang,CHEN Xin.Repetitive-control-based Control Technology for Microgrid Inverters[J].JOURNAL OF POWER SUPPLY,2018,16(2):38-44,94
Repetitive-control-based Control Technology for Microgrid Inverters
Received:October 30, 2017  Revised:January 05, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.38
Keywords:microgrid inverter  repetitive control  seamless transfer  harmonic current suppression
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SUN Longting College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China sunlongting@foxmail.com
ZHANG Yang College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China
CHEN Xin College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China
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Abstract:
      A microgrid inverter has two working modes:when the grid is under normal operation, it can work in a grid-connected mode; and when the grid fails, it can work in an islanding mode to power the local loads continuously. To realize seamless transfer between the two working modes, an optimization method for control loop transition and phase locking is proposed in this paper. In addition, considering that the power supply quality of the microgrid inverter in a grid-connected mode may suffer from the background harmonics in grid voltage, a T/6 repetitive control method is introduced to suppress the harmonic current, which has a six-fold response speed compared with the conventional repetitive control method. Finally, the effectiveness of the proposed strategy was verified through tests on an experimental prototype.
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