Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High-Pass-Filter-Based Virtual Impedance Control for LCL-filtered Inverters Under Weak Grid

  • Wang, Jiangfeng (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Xing, Yan (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Zhang, Li (College of Energy and Electrical Engineering, Hohai University) ;
  • Hu, Haibing (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Yang, Tianyu (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Lu, Daorong (College of Automation Engineering, Nanjing University of Aeronautics and Astronautics)
  • Received : 2017.11.17
  • Accepted : 2018.08.09
  • Published : 2018.11.20
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Abstract

Voltage feed-forward control (VFFC) is widely used in LCL-type grid-tied inverters due to its advantages in terms of disturbance rejection performance and fast dynamic response. However, VFFC may worsen the stability of inverters under weak grid conditions. It is revealed in this paper that a large phase-lag in the low-frequency range is introduced by VFFC, which reduces the phase margin significantly and leads to instability. To address this problem, a novel virtual-impedance-based control, where a phase-lead is introduced into the low-frequency area to compensate for the phase lag caused by VFFC, is proposed to improve system stability. The proposed control is realized with a high-pass filter, without high-order-derivative components. It features easy implementation and good noise immunity. A detailed design procedure for the virtual impedance control is presented. Both theoretical analysis and experimental results verify the effectiveness of the control proposed.

Keywords

References

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