Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

Cheng Nie, Yue Wang, Wanjun Lei, Tian Li and Shiyuan Yin
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Cheng Nie: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Yue Wang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Wanjun Lei: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Tian Li: Key Laboratory of Shaanxi Smart Grid, Xi’an Jiaotong University, Xi’an 710049, China
Shiyuan Yin: Key Laboratory of Shaanxi Smart Grid, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2018, vol. 11, issue 10, 1-15

Abstract: In microgrid, the grid-connected inverter current with the LCL (inductor-capacitor-inductor) output filter is amplified at certain frequencies. Using virtual resistor damping method can help suppress the amplification. By choosing an appropriate virtual resistor value, the model of the inverter current control loop is simplified as a 2 nd -order lowpass filter. Based on such simplified model, this paper proposes a design method of reference current compensation controller, which does not require decomposition of harmonic components. With the reference compensation, the inverter output current control precision is improved obviously. The simulation and experimental results verify the accuracy of the inverter simplified model and effectiveness of the reference compensation design method.

Keywords: microgrid; power quality control; optimal virtual resistor; 2 nd -order lowpass filter; reference current compensation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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