摘要
采用多直流模块级联的分布式电源,在新能源发电、网络能源、航空航天等中低压直流系统中获得了广泛应用。针对多级串联型级联系统,提出一种利用各个子模块在理想电压输入下的输出阻抗和空载电压输出下的输入阻抗,计算出整个级联系统开环传递函数的方法,绘制阻抗匹配条件Nyquist曲线,构建出适用于多直流模块级联系统的广义稳定性判据,并提出输出电流反馈优化级联系统的输出阻抗策略,获得了可以改善级联系统稳定性的增强控制方法。通过仿真和实验,验证了稳定性判据条件和改善稳定性策略的有效性、准确性和可行性。
Multi-DC module cascaded distributed power supply has been widely used in low and medium voltage DC systems such as new energy generation,network energy,aerospace and so on.A method of calculating the open-loop transfer function of cascaded system is proposed by using the output impedance of each sub-module under ideal input and the input impedance under no-load output.The impedance matching condition Nyquist curve is drawn,and the generalized stability criterion for cascaded system with multi-DC modules is constructed.The cascaded system is optimized by output current feedback.A new method to improve the stability of cascade system is obtained by using the output impedance of the system.Through simulation and experiment,the validity,accuracy and feasibility of the stability criterion condition and the strategy for improving stability are verified.
作者
王伟
宫池玉
焦庆丽
WANG Wei;GONG Chi-yu;JIAO Qing-li(Rizhao Power Supply Company of Shandong Power Co.,Ltd.,Rizhao 276800,China)
出处
《电力电子技术》
CSCD
北大核心
2019年第11期66-70,共5页
Power Electronics
基金
国家自然科学基金(51777012,51777041)~~
关键词
分布式电源
级联系统
稳定性分析
阻抗匹配
distributed power supply
cascade system
stability analysis
impedance matching
