A wind-storage coordinated control strategy for improving system frequency response characteristics

被引：0
|
作者：
Jiang H. [1 ]
Cai J. [1 ]
Xiao R. [1 ]
Wang S. [1 ]
Xie Y. [2 ]
Tang X. [2 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin
[2] State Key Laboratory of Grid Security and Energy Conservation, China Electric Power Research Institute, Beijing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Coordinated control strategy; Doubly-fed induction generator; Energy storage system; Frequency stability; Wind speed segmentation;
D O I：
10.16081/j.epae.202105019
中图分类号：
学科分类号：
摘要：
The continuous expansion of wind power integration scale weakens the inertia level of power system and brings great challenges to frequency stability. By analyzing the ability of DFIG(Doubly-Fed Induction Generator) to participate in the inertial response at different wind speeds, a wind speed segmentation method is presented to determine the wind speed range for DFIG participating in frequency modulation. On this basis, a frequency modulation control strategy combined with DFIG and energy storage technology is proposed. According to the frequency change characteristics in the two stages of system inertia response and frequency recovery, the wind-storage joint output mode is formulated. In the inertia response stage, virtual inertia control is used to release the rotor kinetic energy of DFIG to prevent frequency drop, and overspeed control is used to distribute the change of DFIG speed to both sides of the maximum power point tracking control operation point to improve the frequency modulation effect. At the same time, the output power of energy storage system is gradually increased to make up for the decrease of frequency modulation power in the later period of DFIG. In the frequency recovery stage, DFIG is exited from the frequency modulation mode to avoid the virtual inertia control requesting energy from the system, and mainly relying on the output of energy storage system to assist the synchronous generator to speed up the primary frequency modulation. Simulative results show that the proposed method can effectively improve the frequency response characteristics of the system, avoid the occurrence of secondary frequency accidents, and improve the frequency stability of the system. © 2021 Electric Power Automation Equipment Editorial Department. All right reserved.
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页码：44 / 51
页数：7
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