Journal of Power Electronics

  • 제17권3호
  • /
  • Pages.756-765
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  • 2017
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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An Improved Control Method for Power Conversion System under a Weak Grid by the Adoption of Virtual Resistors

  • Gao, Ning (Wind Power Research Center, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University) ;
  • Sang, Shun (Wind Power Research Center, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University) ;
  • Li, Rui (Wind Power Research Center, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University) ;
  • Cai, Xu (Wind Power Research Center, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University)
  • 투고 : 2016.09.20
  • 심사 : 2017.01.17
  • 발행 : 2017.05.20
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초록

The control of the power conversion system (PCS) in a battery energy storage system has a challenge due to the existence of grid impedance. This paper studies an impedance model of an LCL-based PCS in the d-q domain. The feature of a PCS connected to a weak grid is unveiled by use of an impedance model and a generalized Nyquist criterion. It is shown that the interaction between grid impedance and the PCS destabilizes the cascaded system in certain cases. Therefore, this paper proposes a novel control method that adopts virtual resistors to overcome this issue. The improvement in the control loop leads the PCS to a more stable condition than the conventional method. Impedance measurement is implemented to verify the correctness of the theoretical analysis. Experimental results obtained from a down-scaled prototype indicate that the proposed control method can improve the performance of the PCS under a weak grid.

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참고문헌

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