摘要
大量新能源设备与负荷通过电力电子变流器接入直流微电网,导致多变流器直流微电网(MCDCM)的小干扰稳定性面临严峻挑战,且使用传统阻抗比与状态空间模型分析MCDCM时存在一定的局限性。基于变流器端口的阻抗特性,建立MCDCM的阻抗网络模型与具有开环稳定特性的负反馈系统,并将阻抗网络模型应用于直流微电网的稳定性判别与设计。一个包含6个变流器的MCDCM的时域仿真结果验证了该方法在MCDCM稳定性判别与设计中的优势。
The integration of many renewable energy equipments and loads into DC microgrid through power electronic converters makes the small disturbance stability of MCDCM(Multi-Converter DC Microgrid)face severe challenges,and some limitations exist when using the traditional impedance ratio and state space model to analyze MCDCM.An impedance network model and a negative feedback system with open-loop stable characteristic of MCDCM are established based on the impedance characteristic of converter ports,and the impedance network model is applied to the stability judgment and design of DC microgrid.The time-domain simulative results of a MCDCM with six converters verify the advantages of the proposed method in stability judgment and design of MCDCM.
作者
刘镇湘
赵晋斌
曾志伟
屈克庆
毛玲
LIU Zhenxiang;ZHAO Jinbin;ZENG Zhiwei;QU Keqing;MAO Ling(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2021年第5期29-33,84,共6页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51777120)。
关键词
阻抗网络模型
多变流器
小扰动稳定性
等价开环函数
广义Nyquist判据
impedance network model
multi-converter
small disturbance stability
equivalent open-loop func⁃tion
generalized Nyquist criterion
