CJEE

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (3): 49-58.doi: 10.23919/CJEE.2019.000020

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Optimization of Wind Farm Collection Line Structure under Symmetrical Grid Fault*

Huan Jin, Xueyi Zhang, Yang Zhang*, Qianghui Xiao, Juan Li, Ya Liu   

  1. Hunan University of Technology, Zhuzhou 412007, China
  • Online:2019-09-25 Published:2019-12-20
  • Contact: * Email: hut_zy@163.com
  • About author:Huan Jin was born in Fengcheng, China, in October 1994. She received her B.S. degree in electrical engineering from Hunan Institute of Technology in 2017. She is currently pursuing her M.S. degree at Hunan University of Technology.Her main research interests include power system analysis and simulation.Xueyi Zhang was born in Yiyang City, Hunan Province, China, in June 1966. He received his B.S. degree in radio science from Xiangtan University. He is currently a Research Professor in electrical engineering with Hunan University of Technology. Since July 1989, he has been engaged in electrical engineering, automation, and electronic information professional technology and has conducted research in power communication, radio energy transmission, and power electronics technology. Yang Zhang received his B.S. degree in applied physics and his M.S. degree in electrical engineering from Hunan University of Technology, Zhuzhou, China. He received his Ph.D. degree in electrical engineering from Hunan University, Hunan, China, in 2017.He is currently an Assistant Professor in Hunan University of Technology. His current research interests include wind power generation system and impedance-source converters.Qianghui Xiao received his B.S. and M.S. degrees in electrical machine from Huazhong University of Science and Technology, Wuhan, Hubei, China, in 1991 and 1993, respectively, and his Ph.D. degree in Electrical Machine from Tsinghua University, Beijing, China, in 1997. He is currently a Research Professor in electrical engineering with Hunan University of Technology. His research interests focus on modern power electronics technology, modern control theory, and application. Juan Li received her B.S. degree in electrical engineering from Kunming University of Technology, China. She is currently pursuing her M.S. degree at Hunan University of Technology, Hunan, China. Her current research interests include power network automation technology and application.Ya Liu was born in Loudi, China, in December 1992. He received his B.S. degree from Hunan University of Technology, Hunan, China in 2015, where he is currently pursuing his M.S. degree in power electronics and drives. His research interests include senseless starting control of motors and their applications in wind-power systems.
  • Supported by:
    * Supported by Natural Science Foundation of Hunan Province of China (2019JJ50119), Educational Commission of Hunan Province of China (18C0510), and Zhuzhou City Science and Technology Plan (Zhu Ke Fa [2017] No. 68)

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Abstract: A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance. Therefore, the grouping of the wind turbines in the wind farm determines the layout of the lines and affects the line impedance. The line structure and composition of the wind farm are analyzed, and the relationship between the impedance of the collection line and reactive power generated by the wind turbine at low-voltage ride through is derived. We conclude that the smaller the equivalent impedance of the wind farm collection line structure is, the greater the reactive power at the wind farm collection line point is. In addition, the economic aspect of the collection line needs to be considered in the design. The economic aspect and impedance values have contrasting characteristics. Therefore, according to the condition of minimum impedance and optimized economic aspect, an optimization model of a wind-farm collector-circuit structure is proposed. The optimal structure of the wind farm collector circuit is calculated using the Monte Carlo method, and the theoretical analysis is verified by simulation.

Key words: Wind farm, symmetrical grid fault, collection line, optimization model