Improved Control Strategy for Inertia and Primary Frequency Regulation of Doubly Fed Induction Generator Based on Rotor Kinetic Energy and Supercapacitor Energy Storage
Yan Xiangwu1, Sun Xuewei2, Cui Sen1, Li Xiaoyu1, Li Tiecheng3
1. Hebei Provincial Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding 071003 China; 2. State Grid Tianjin Procurement Company Tianjin 300304 China; 3. State Grid Hebei Electric Power Research Institute Shijiazhuang 050021 China
Abstract：The large-scale application of wind power eases the conventional energy shortage's pressure, but it brings great hidden danger to the safe and stable operation of power grid as the wind power does not have the ability of frequency regulation. Doubly-fed induction generator (DFIG) can effectively respond to the frequency fluctuation when using rotor kinetic energy to participate in the system frequency regulation, but it has the problems of frequency secondary drop and output active power reduction when exiting frequency regulation, besides it can not provide long-term power support. To solve this problem, a coordinated frequency control strategy based on rotor kinetic energy and supercapacitor energy storage is proposed in this paper after analyzing the inertia sustaining capability of rotor kinetic energy. By using rotor kinetic energy and supercapacitor to realize the inertia and droop characteristics like synchronous generator respectively, it can ensure DFIG provide fast and long-term power support when system frequency fluctuates. Besides, supercapacitor is controlled to increase the output active power when rotor kinetic energy exits inertia sustaining, so as to avoid secondary frequency drop caused by the power sudden drop. The tracking curve of rotor speed and output power is changed during the rotor speed recovery, so as to minimize the reduction of output active power.
颜湘武, 孙雪薇, 崔森, 李晓宇, 李铁成. 基于转子动能与超级电容器储能的双馈风电机组惯量和一次调频改进控制策略[J]. 电工技术学报, 2021, 36(zk1): 179-190.
Yan Xiangwu, Sun Xuewei, Cui Sen, Li Xiaoyu, Li Tiecheng. Improved Control Strategy for Inertia and Primary Frequency Regulation of Doubly Fed Induction Generator Based on Rotor Kinetic Energy and Supercapacitor Energy Storage. Transactions of China Electrotechnical Society, 2021, 36(zk1): 179-190.
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2021, Vol. 36 
