Multi-Sampled Grid-Side Current Control for LCL-Filtered VSCs with Enhanced Dissipativity

IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1–6

Abstract

For the grid-side current control of LCL-filtered grid-connected converters, capacitor current active damping is a common method to enhance dissipativity. However, the dissipation near the critical frequency can be jeopardized by the filter parameter deviation, which may result in high-frequency resonances. Besides, the grid voltage feedforward is often abandoned due to the stability consideration, which is however preferred in the practical application to enhance the transient performance. To tackle these challenges, a multi-sampled current control scheme is proposed in this paper. By combining the capacitor current active damping and the capacitor voltage feedforward, not only the dissipative range can be optimized up to the switching frequency, but also the robustness against the filter parameter deviation is enhanced. The validity of the proposed method is verified through the experiments.

Authors 6

1. Shan He

   Aalborg University

   Affiliation as printed

   Aalborg University,Department of Energy,Aalborg,Denmark

   Department of Energy, Aalborg University, Aalborg, Denmark

2. Zhiqing Yang

   Hefei University of Technology

   Affiliation as printed

   School of Electrical Engineering and Automation, Hefei University of Technology,Hefei,China

   School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China

3. Dao Zhou

   Aalborg University

   Affiliation as printed

   Aalborg University,Department of Energy,Aalborg,Denmark

   Department of Energy, Aalborg University, Aalborg, Denmark

4. Xiongfei Wang

   Aalborg University

   Affiliation as printed

   Aalborg University,Department of Energy,Aalborg,Denmark

   Department of Energy, Aalborg University, Aalborg, Denmark

5. Rik W. De Doncker Aachen E.ON Energy Research Center

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,E. ON Energy Research Center,Aachen,Germany

   E. ON Energy Research Center, RWTH Aachen University, Aachen, Germany

6. Frede Blaabjerg

   Aalborg University

   Affiliation as printed

   Aalborg University,Department of Energy,Aalborg,Denmark

   Department of Energy, Aalborg University, Aalborg, Denmark