CJEE

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (3): 112-122.doi: 10.23919/CJEE.2022.000030

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Reduced Model of Droop-controlled Converters for Transient Simulation Analysis*

Yingjie Tan1, Yang Shen2,*, Min Xu1, Chao Shen2, Jinyong Lei1   

  1. 1. Electric Power Research Institute, CSG, Guangzhou 510663, China;
    2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
  • Received:2021-03-20 Revised:2021-06-18 Accepted:2021-07-20 Online:2022-09-25 Published:2022-10-21
  • Contact: * E-mail: shenyang96@hnu.edu.cn
  • About author: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.
    Yang Shen received his B.S degrees in Electrical Engineering from Jiangsu University, Zhenjiang, China, in 2018. And he is now working towards the Ph. D. degree in Hunan University, Changsha, China. His research interests include mathematical modeling, transient stability analysis, and artificial intelligence application of microgrid system.
    Min Xu received the Ph.D. degree in Electrical Engineering from the South China University of Technology, Guangzhou, China, in 2015. He is currently an office head of Power Distribution Network Department, Electric Power Research Institute, China Southern Power Grid Co., Ltd. His research interests include power system dynamics.
    Chao Shen received the B.S. degree in Electrical Engineering from the College of Electrical and Information Engineering, Hunan University, Changsha, China, in 2015, where he is currently pursuing the Ph.D. degree. His research interests include mathematical modeling, transient stability analysis, and control of microgrid system.
    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: In recent years, the transient stability problems encountered by power grids have increasingly attracted interest due to the connection of renewable energy resources. One of the effective methods for studying the transient characteristics of a system is transient simulation analysis. To reduce the simulation time, especially in a system with numerous renewable energy resources, model reduction has been widely employed. However, when a general reduced model is adopted to analyze different transient characteristics, a tradeoff between accuracy and simulation speed emerges. In this study, reduced model selection is implemented to resolve this problem. Considering the droop-controlled converter as an example, this approach allows the transient simulation analysis of voltage, frequency, and power angle characteristics. First, a full-order model of the droop-controlled inverter is formulated. Thereafter, the singular perturbation method is applied to derive different reduced-order models. Then, considering accuracy and simulation speed simultaneously, the most suitable reduced models for transient angle, voltage, and frequency simulation analyses are determined through time-domain simulation comparison. Finally, the simulation results based on Matlab/Simulink are used to verify the correctness of the reduced model selection.

Key words: Droop-controlled inverter, transient analysis, reduced-order model, singular perturbation