中国电气工程学报（英文） ›› 2022, Vol. 8 ›› Issue (4): 113-120.doi: 10.23919/CJEE.2022.000043

• • 上一篇    

  

  • 收稿日期:2021-01-20 修回日期:2021-07-24 接受日期:2021-09-14 出版日期:2022-12-25 发布日期:2023-01-13

Interactive Power Oscillation and Its Suppression Strategy for VSG-DSG Paralleled System in Islanded Microgrid*

Zhiyong Yuan1, Xia Shen2,*, Yingjie Tan1, Zhenhua Tan2, Jinyong Lei1   

  1. 1. Electric Power Research Institute, CSG, Guangzhou 510663, China;
    2. National Electrical Energy Conversion and Control Engineering Technology Research Center, Hunan University, Changsha 410082, China
  • Received:2021-01-20 Revised:2021-07-24 Accepted:2021-09-14 Online:2022-12-25 Published:2023-01-13
  • Contact: * E-mail: shenxia@hnu.edu.cn
  • About author:Zhiyong Yuan received his Ph.D. degree in Electrical Engineering from Tsinghua University, in 2006. He is currently the Director of Power Distribution Network Department, Electric Power Research Institute, China Southern Power Grid Co., Ltd. His research interests include power electronics and microgrids.
    Xia Shen received the B.S. degree in Electrical Engineering from Jiangsu University, Zhenjiang, China, in 2016. Now she is currently working toward the Ph.D degree in Power Electronics in the College of Electrical Engineering at Hunan University, Changsha, China. Her research interests include fault analysis and control of hybrid AC/DC microgrid.
    Yingjie Tan received the Ph.D. degree in Electrical Engineering from the University of Wollongong, Wollongong, NSW, Australia, in 2017. He is currently a Research Fellow with Electric Power Research Institute, Guangzhou, China Southern Power Grid Co., Ltd. His research interests include power electronics, renewable distributed generation and microgrids.
    Zhenhua Tan received the undergraduate degree in Electrical Engineering from the Hunan University, China, in 2019. He is currently studying in Hunan University as a master's degree student. His research interests are artificial intelligence and microgrid technology.
    Jinyong Lei received his B.S. and Ph.D. degrees in Electric Engineering from the Department of Electrical Engineering, Zhejiang University, Zhejiang, China, in 2005 and 2010, respectively. Currently, he is the Principle Engineer with the Power Distribution Network Department, Electric Power Research Institute, China Southern Power Grid Co., Ltd. His research interests include distributed generation, renewable energy and microgrid.
  • Supported by:
    * Science and Technology Project of China Southern Power Grid (ZBKJXM20180211).

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Abstract: A virtual synchronous generator (VSG) can provide inertial support through renewables and energy storage. It generally operates in parallel with a diesel generator (DSG) in an islanded microgrid. However, unforeseen interactive power oscillations occur in the paralleled system when loads fluctuate. These may also burn out the VSG owing to its low overcurrent capacity. The mechanism and suppression strategy of the power oscillation of a VSG-DSG paralleled system are investigated. It reveals that the interactive power oscillation is caused essentially by the physical difference and parameter mismatch between the VSG and DSG. Then, the elimination condition of oscillation generation is derived. Subsequently, a comprehensive suppression control strategy based on virtual inductance and dynamic mutual damping technology is proposed. Finally, the experimental results verify the effectiveness of the proposed method.

Key words: Islanded microgrid, VSG-DSG paralleled system, oscillation mechanism, virtual inductance, dynamic mutual damping, suppression strategy