State feedback voltage oscillation control technology of DC microgrid with constant power load

被引：0
作者：
Fu Y. [1 ]
Wang Y. [1 ]
Zhang X. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 05期
基金：
中国国家自然科学基金;
关键词：
DC microgrid; Participation factor; Pole placement; State feedback; Voltage oscillation;
D O I：
10.16081/j.epae.202103017
中图分类号：
学科分类号：
摘要：
Under the existing power control mode, the negative impedance characteristics of new energy gene-ration and constant power load-side converter after disturbance greatly increase the risk of DC voltage oscilla-tion instability. For that, the small-disturbance linearized state equation of two-terminal DC microgrid with constant power load is firstly derived to solve the problem of DC voltage oscillation instability. Secondly, the oscillation current and voltage are selected as adjustable control parameters by the coordination of participation factors for each state variable, which are introduced into the duty cycle feedback link of energy storage converter and constant power load converter respectively, so that the multi-terminal DC voltage oscilla-tion control method based on state feedback is proposed. Thirdly, the root locus and Bode diagram are used to analyze the variation law of stability margin for DC microgrid with additional state feedback voltage oscillation control technology, which provides the basis for control parameter design. Finally, a time-domain simulation system is built to verify that the proposed control method can effectively suppress the voltage oscillation of DC microgrid and significantly improve the system dynamic stability. © 2021, Electric Power Automation Equipment Press. All right reserved.
引用
收藏
页码：167 / 174
页数：7
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