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ZHANG Mengfan,FU Mingyue,CHEN Xin.Voltage Balance Control Strategy for Microgrid Inverter Based on Proportional Integral Resonance[J].JOURNAL OF POWER SUPPLY,2018,16(2):86-94
Voltage Balance Control Strategy for Microgrid Inverter Based on Proportional Integral Resonance
Received:November 30, 2017  Revised:March 02, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.86
Keywords:unbalanced load  voltage balance control  positive and negative-sequence separation  quasi-resonant control  microgrid inverter  indirect current control
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ZHANG Mengfan College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China
FU Mingyue 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 chen.xin@nuaa.com
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Abstract:
      Under unbalanced or single-phase load, the traditional double closed-loop control method of voltage and current will cause a serious problem of output voltage unbalance to themicro-grid inverter working in island mode, thus endangering the supply equipment and even the overall system. Based on a three-phase four-wire inverter system with split capacitor,a mathematical model is established to analyze how to suppress the voltage unbalance when the inverter works in island mode and with unbalanced load. The shortcomings of the traditional proportional integral(PI) control are analyzed, and a control strategy based on positive and negative-sequence independent control and PI quasi-resonant control isproposed. Meanwhile, to satisfy the smooth switching requirements of microgrid operation states, a smooth switching control strategy is given based on indirect current control. Simulation results prove the correctness of the proposed strategy. Finally, the practicality and validity of this strategy were verified by tests on an experimental platform of microgrid inverter.
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