电力电子化电力系统暂态稳定性分析综述

Analysis of Transient Stability of Power Electronics Dominated Power System:An Overview

与传统交流电力系统相比,电力电子化电力系统具有其特殊性,其拓扑结构会随着电力电子器件的开关动作而改变、多个时间尺度的控制相互作用、非线性程度强、结构更加复杂、状态变量阶数更高,这些特点给电力电子化电力系统的暂态稳定性分析带来了严峻的挑战。该文首先基于电力电子化电力系统的结构特点将其暂态稳定性分析划分为3个层次;然后通过研究电力电子化电力系统与传统交流电力系统暂态稳定性分析的差异,结合非线性系统理论阐述其暂态稳定性的本质;接着总结将传统交流电力系统暂态稳定性分析方法应用于电力电子化电力系统所需要解决的问题;最后将直接法分解成建模、简化模型、构造李雅普诺夫函数和估计吸引域4个步骤。该文全面梳理暂态稳定性分析方法,探索电力电子化电力系统暂态稳定性分析的基本思路和方法,为电力电子化电力系统的暂态运行及控制研究提供一些可靠的理论基础。

Compared with the traditional AC power system, there are some particularities in power electronic dominated power system. The topology of system changes with the action of power electronic switch. Multiple time-scale controls can produce interactions. The system has more complex structure and nonlinear phenomena. The state variables have higher order. These characteristics have brought new challenges to the power electronic power system transient stability analysis. Based on the analysis of the structure of the power electronic power system, the transient stability analysis of the power electronic power system was divided into three levels. Through studying the differences of transient stability analysis between the power electronic dominated power systems and the traditional AC power systems, combining with the theory of nonlinear systems, the essence of the system transient stability has been analyzed. This paper summed up the problems of applying the transient stability analysis methods of the traditional AC power system to power electronic dominated power system need to be solved. The direct method is decomposed into four steps： modeling, simplifying model, generating the Lyapunov function and estimating the attracting domain. The purpose of this paper is to discuss the transient stability analysis method, to explore the basic idea of transient stability analysis of power electronic dominated power system, and to establish the foundation for the next research work.