中国电气工程学报（英文） ›› 2019, Vol. 5 ›› Issue (3): 10-19.doi: 10.23919/CJEE.2019.000016

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  • 出版日期:2019-09-25 发布日期:2019-12-20

Double-loop Control Structure Using Proportional Resonant and Sequence-decoupled Resonant Controllers in Static Coordinates for Dynamic Voltage Restorer

Vu Thai Hung1,2,*, Hongchun Shu1, Le Ngoc Giang2, Nguyen Duc The2   

  1. 1. School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China;
    2. AD-AF Academy of Viet Nam, Son Tay, Ha Noi 100000, Viet Nam
  • Online:2019-09-25 Published:2019-12-20
  • Contact: * Email: vuthaihungqs@yahoo.com
  • About author:Vu Thai Hung was born in Thai Binh, Viet Nam, in 1984. He is a PhD student in the school of Electric Power Engineering, Kunming University of Science and Technology, China. His main research interests are power electronics technology application and power quality control. Hongchun Shu was born on September 10, 1961 in Jiangdanyang. He is a Prof. at faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, China. His main research interests are power system fault detection and protection and control. Le Ngoc Giang was born in Ha Noi, Viet Nam, on July 21, 1975. He is a PhD in Electric Power System and its Automation. His main research interests are power system control and power system stability analysis, smart grid demand response, building automation system, and renewable energy. Currently, he is a lecturer at ADAF Academy, Ha Noi, Viet Nam.Nguyen Duc The was born on October 6, 1985 in Nam Dinh, Viet Nam. He is a Master in Control Engineering and Automation. Currently, he works for ADAF Academy in Ha Noi, Viet Nam.

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Abstract: Among incidents on grids, the sag/swell voltage is considered as the most frequent incident. To solve this problem, custom power devices are used. In particular, the dynamic voltage restorer (DVR) is a modern and efficient customer device. DVRs are used to mitigate voltage sag/swells and harmonics on the load bus, thus protecting the sensitive loads. The DVR is a serial compensator that applies a voltage to the point of common coupling to maintain the voltage of sensitive load at the nominal value. To improve the performance of DVRs, in this study, the control strategy of the two-stage loop circuit is implemented. The external voltage control loop uses a sequence-decoupled resonant (SDR) controller, and the inner current-control loop uses the proportional resonant (PR) controller implemented in the stationary frame αβ.

Key words: Dynamic voltage restorer, PR controller, SDR controller, nonlinear load