CJEE

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (2): 52-61.doi: 10.23919/CJEE.2022.000014

Special Issue: Special Issue on Active Control and Protection of Future Renewables-dominated Distribution Grid

• Special Issue Papers • Previous Articles     Next Articles

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Frequency Trajectory Planning-based Frequency Regulation Strategy for Wind Turbines Equipped with Energy Storage System

Yang Qian1, Hongyan Wang1,*, Mengen Zhou1, Haipeng Lv2, Yonghui Liu3   

  1. 1. School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
    2. School of Electrical Engineering, Xinjiang University, Urumqi 830000, China;
    3. Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
  • Received:2022-02-10 Revised:2022-04-25 Accepted:2022-05-10 Online:2022-06-25 Published:2022-07-08
  • Contact: * E-mail: 1291908276@qq.com
  • About author:Yang Qian was born in Changzhou, Jiangsu, China, in 1996. He received the B.S. degree from Nanjing Institute of Technology, Nanjing, China in 2019. He is currently pursuing the M.S. degree at Nanjing Institute of Technology, Nanjing, China. His current research interests include renewable energy generation and stability analysis.
    Hongyan Wang received the Ph.D. degree from Chinese Academy of Sciences, Hefei, China in 2006. She is a Professor at Nanjing Institute of Technology, Nanjing, China. Her current research interests include renewable energy generation and stability analysis. She is a frequent reviewer of Fusion Engineering and Design.
    Mengen Zhou was born in Huaian, Jiangsu, China, in 1996. He received the B.S. degree in Electrical Engineering degree from China University of Mining and Technology, Xuzhou, Jiangsu, China in 2019. He is currently pursuing the M.S. degree at Nanjing Institute of Technology, Nanjing, China. His current research interests include renewable energy generation and stability analysis.
    Haipeng Lv was born in Pingliang, Gansu, China, in 1994. He received the B.S. degree in Electrical Engineering degree from Lanzhou University of Technology, Lanzhou, China in 2017. He is currently pursuing the M.S. degree at Xinjiang University, Urumqi, China. His current research interests include renewable energy generation and stability analysis.
    Yonghui Liu (Member, IEEE) received the B.S. degree from the Harbin Institute of Technology, Harbin, China, in 2013, and the M.S. degree from Xi'an Jiaotong University, Xi'an, China, in 2016, both in Electrical Engineering. She is currently working toward the Ph.D. degree in Electrical Engineering with The Hong Kong Polytechnic University, Hong Kong. Her research interests include modeling and control of converters, renewable energy integration, VSC-HVDC, and wireless power transfer.

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Abstract: The increase in wind power penetration has weakened the equivalent inertia of the power system, posing a significant challenge to frequency stability. In this paper, a frequency trajectory planning (FTP)-based frequency regulation (FR) strategy is proposed for permanent magnet synchronous generator-based wind turbines equipped with an energy storage system (ESS) on the DC link. The core idea is that the frequency index provided by the grid code is used to plan a safe frequency trajectory when the system frequency fluctuates. The FR power provided by the ESS is controlled by tracking the planned frequency trajectory to compensate for the unbalanced power in the system, provide inertia support, and ensure the frequency stability of the power grid. The proposed strategy can suppress the frequency fluctuation and optimize the FR power of the ESS. It also effectively circumvents the complex parameter design process of virtual inertia control. The simulation model is established in Matlab/Simulink to verify the effectiveness of the control strategy.

Key words: Permanent magnet synchronous generator (PMSG), wind turbine (WT), energy storage system (ESS), frequency regulation (FR), frequency trajectory planning (FTP)