中国电气工程学报（英文） ›› 2021, Vol. 7 ›› Issue (1): 55-62.doi: 10.23919/CJEE.2021.000005

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  • 收稿日期:2020-10-14 修回日期:2020-12-15 接受日期:2021-03-01 发布日期:2021-04-19

A Novel Soft-start Method for SVG Based on D-axis Orientation*

Shicheng Zheng1,2,*, Ying Shu1,2, Mengmeng Qi1,2, Jiahong Lang1,2, Xuefeng Hu1,2   

  1. 1. School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan 243002, China;
    2. Key Lab of Power Electronics & Motion Control, Anhui University of Technology, Ma'anshan 243002, China
  • Received:2020-10-14 Revised:2020-12-15 Accepted:2021-03-01 Published:2021-04-19
  • Contact: * E-mail: ahutzsc@126.com
  • About author:Shicheng Zheng received his Ph.D degree in electrical engineering from Hefei University of Technology (HFUT), Hefei, China, in 2005. In 2005, he joined the School of Electrical and Information Engineering at Anhui University of Technology, Ma'anshan, China, to undertake research in the area of power electronics and power drive. He was appointed lecturer in 2008. He is currently a professor in the School of Electrical and Information Engineering, Anhui University of Technology.His current research interests focus on power converters, grid connected inverters, distributed power generation, power drive and power quality, and so on.Professor Zheng is a senior member of the CPSS. Ying Shu received her B.S. degree in electrical engineering from East China Jiaotong University, Nanchang, China, in 2018, where she is presently working towards her M.S. degree. Her current research interests include power electronics, DC-DC power conversion, and the modeling and control of converters.Mengmeng Qi received his B.S. degree in electrical engineering from Beihua University, Jilin, China, in 2019, where he is presently working towards his M.S. degree. His current research interests include power electronics, DC-DC power conversion, and the modeling and control of converters.Jiahong Lang received his B.S. degree in the Department of Physics, Anhui University, Hefei, China, in 1997, and the M.S degree in the Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology) Ministry of Education. He is currently an associate professor in the School of Electrical and Information Engineering, Anhui University of Technology, Ma'anshan, China.His current research interests include power converters, automatic control system design, monitoring and optimization, new energy development technology, and power quality management.Xuefeng Hu received the M.S. degree in electronic engineering from the China University of Mining and Technology, Xuzhou, China, in 2004, and the Ph.D. degree in electrical engineering from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2014. He is currently a professor at Anhui University of Technology, Ma'anshan, China. He is the author or co-author of more than 40 technical papers. His current research interests include renewable energy systems, the modeling and control of converters, and flexible AC transmission systems.
  • Supported by:
    * Natural Science Foundation of Anhui Province (KJ2017A044).

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关键词: Soft-start, coordinate transformation, modulation ratio, shock-free, D-axis orientation

Abstract: In this paper, a novel method for shock-free soft-start is proposed. The novel method can realize the aim of no-overshoot and inrush of current during the entire soft-start process, thus the start process is safe, stable, and reliable. When the uncontrolled rectification stage ends, a sinusoidal signal synchronized with the grid voltage is generated through dq coordinate transformation and D-axis orientation, then the signal is transmitted to the three-phase inverter bridge. The AC voltage output of the inverter bridge is superimposed on both ends of the soft-start resistor along with the grid. The open-loop control method is adopted to gradually reduce the modulation ratio of the sinusoidal PWM wave until the capacitor voltage on the DC side reaches the rated voltage value, then the soft-start resistor is removed, which means the shock-free soft-start process is completed. Experimental results prove the effectiveness and feasibility of the control strategy proposed in this paper.

Key words: Soft-start, coordinate transformation, modulation ratio, shock-free, D-axis orientation