交流多模块互联电力电子系统稳定性判据研究

Research on Stability Criteria of Multi-Module Inter-Connected AC Power Electronic Systems

每个空间上相互隔离、功能上相对独立的电力电子变换装置都可看作一个模块,由这些模块通过母线相互连接而成的大的电能变换、传输和应用系统,都可归类为多模块互联电力电子系统。分析母线电压或电流不是稳恒直流亦即其幅值中含交流分量的多模块互联系统出现稳定性问题的原因,概述国际、国内学术界对该问题的研究历史和现状,并在通过离散傅里叶级数分解获取端口阻抗特性基础上提出新的适用于交流互联系统的稳定性判据。

Each power electronics converter which is separated in space and functionally independent can be viewed as a module, and any energy conversion, transmission or application system can be classified as a multi-module interconnected power electronics system if it is generated by connecting the modules via a bus or several buses. The research advances in stability issues of multi-module inter-connected AC power electronic systems around the world was reviewed and summarized. Based on approaches that obtain the input and output impedance characteristics by discrete Fourier series （DFS）, a new stability criterion suitable for AC inter-connected systems is proposed.