Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Mechanism Analysis and Stabilization of Three-Phase Grid-Inverter Systems Considering Frequency Coupling

  • Wang, Guoning (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University) ;
  • Du, Xiong (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University) ;
  • Shi, Ying (School of Automation Engineering, Chongqing University) ;
  • Tai, Heng-Ming (Department of Electrical and Computer Engineering, University of Tulsa) ;
  • Ji, Yongliang (Electric Power Research Institute of State Grid Chongqing Electric Power Company)
  • Received : 2017.08.18
  • Accepted : 2017.12.20
  • Published : 2018.05.20
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Abstract

Frequency coupling in the phase domain is a recently reported phenomenon for phase locked loop (PLL) based three-phase grid-inverter systems. This paper investigates the mechanism and stabilization method for the frequency coupling to the stability of grid-inverter systems. Self and accompanying admittance models are employed to represent the frequency coupling characteristics of the inverter, and a small signal equivalent circuit of a grid-inverter system is set up to reveal the mechanism of the frequency coupling to the system stability. The analysis reveals that the equivalent inverter admittance is changed due to the frequency coupling of the inverter, and the system stability is affected. In the end, retuning the bandwidth of the phase locked loop is presented to stabilize the three-phase grid-inverter system. Experimental results are given to verify the analysis and the stabilization scheme.

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References

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