Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Harmonic resonance analysis and stability improvement for grid-connected inverters

  • Xie, Bao (State Key Laboratory of Power Transmission Equipment, System Security and New Technology, Chongqing University) ;
  • Zhou, Lin (State Key Laboratory of Power Transmission Equipment, System Security and New Technology, Chongqing University) ;
  • Liu, Tiantian (State Grid Anhui Electric Power Corporation Maintenance Company) ;
  • Mao, Mingxuan (State Key Laboratory of Power Transmission Equipment, System Security and New Technology, Chongqing University)
  • Received : 2019.03.26
  • Accepted : 2019.09.06
  • Published : 2020.01.20
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Abstract

The traditional dual-control-loop strategy is widely used in grid-connected inverters. However, due to uncertain grid conditions, a resonance phenomenon may arise in systems and grid current can be badly distorted. In addition, the systems themselves may be unstable. In this paper, an equivalent impedance model of a grid-connected inverter is established. Based on this, two concepts of circuit resonance and harmonic resonance are proposed. By using the Nyquist stability criterion, it is revealed that harmonic resonance is induced when system stability is decreased, and the harmonic amplification in the system is enhanced. Due to the fact that the dual-control-loop strategy has poor robustness against grid impedance variations, a linear quadratic regulator (LQR) based on full-state feedback is proposed in this paper. The design procedure for selecting the full-state feedback gain is presented. Finally, both simulation and experimental results are presented to verify the effectiveness of the proposed LQR controller.

Keywords

Acknowledgement

This work has been supported by the National Natural Science Foundation of China (Grant Nos. 51477021 and 51707026), China Postdoctoral Science Foundation (Grant No. 2018M643410), Chongqing Special Postdoctoral Science Foundation (Grant No. XmT2018033) and National "111" Project of China under Grant B808036.

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