Wideband Dissipativity Enhancement for Multi-Sampling Controlled Grid-Following VSCs

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

Abstract

With the gradually decreasing cost of high-performance digital processors, multi-sampling current control is a promising method to reduce the control delay and improve the high-frequency dissipativity in grid-connected converters. Specifically, with the capacitor voltage feedforward and the inverter-side current feedback, the dissipation of the multi-sampling current control can be extended up to the switching frequency. However, if the effect of phase-locked loop is considered, a non-dissipative region is still inevitable in the low-frequency area, which leads to a risk of destabilization for weak grid operations. To tackle this challenge, a virtual damping control scheme is proposed in this paper, and the non-dissipative region in the d-axis and the q-axis can be reduced to a specific range, respectively. Moreover, the transient performance is also improved compared with the conventional virtual damping method. Finally, the effectiveness of the proposed method is verified through the simulations.

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

   E. ON Energy Research Center, RWTH Aachen University,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