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ZOU Ye,CHEN Rong,SHEN Zhengbin,LI Peng,GUO Yougui.Design of Grid-connected Inverter Based on Fractional-order Repetitive PI Control[J].JOURNAL OF POWER SUPPLY,2018,16(2):144-150
Design of Grid-connected Inverter Based on Fractional-order Repetitive PI Control
Received:January 05, 2016  Revised:March 28, 2016
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DOI:10.13234/j.issn.2095-2805.2018.2.144
Keywords:grid-connected inverter  fractional-order phase lead  virtual resistance  repetitive PI control
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ZOU Ye Institute of Control Engineering, Xiangtan University, Xiangtan , China 769525652@qq.com
CHEN Rong Institute of Control Engineering, Xiangtan University, Xiangtan , China
SHEN Zhengbin Institute of Control Engineering, Xiangtan University, Xiangtan , China
LI Peng Institute of Control Engineering, Xiangtan University, Xiangtan , China
GUO Yougui Institute of Control Engineering, Xiangtan University, Xiangtan , China
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Abstract:
      Considering the problems of periodic harmonic in grid current and resonance peak in the filter circuit, which both exist in the LCL-type three-phase grid-connected inverter, a repetitive PI compound control scheme based on fractional-order phase lead method is proposed. The design of fractional-order phase lead is adopted, which overcomes the low accuracy of phase correction in the integer-order phase lead method and ensures the system's steady-state output characteristics. The equivalence of the resistor, which is paralleled with the capacitance of LCL filter capacitors, replaces the low-pass filter of compensator with repetitive control, simplifying the parametric design of the repetitive controller. Moreover, the repetitive controller is combined with PI control to improve its poor dynamic response. Through simulation analysis and experimental verification, it was shown that this method improved the system's steady-state performance and dynamic response speed.
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