基于非线性解耦方法的交直流配电系统暂态稳定性分析  

Transient Stability Analysis of AC/DC Distribution System Based on Nonlinear Decoupling Method

作　　者：姜妍 彭克[1] 赵学深[1] 姜淞瀚 JIANG Yan;PENG Ke;ZHAO Xueshen;JIANG Songhan(College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东省淄博市255000

出　　处：《电力系统自动化》2024年第17期56-65,共10页Automation of Electric Power Systems

基　　金：山东省自然科学基金资助项目(ZR2023ME034)。

摘　　要：随着柔性交直流配电系统的迅速发展,电力电子装置和恒功率负载等非线性元件的大规模接入使系统的暂态稳定性问题日趋严重。首先,建立了双环控制下AC/DC与DC/DC换流器并联的具有恒功率负载的交直流配电系统数学模型,并进行非线性泰勒展开。其次,根据非线性解耦理论将原始高阶系统解耦成一系列低阶子系统,确定主导解耦子系统并采用相平面法和逆轨迹法对其进行暂态稳定性分析,通过实物仿真验证理论分析的有效性。然后,基于非线性解耦原理引入非线性参与因子概念,对状态变量进行参与因子的计算,提出恒功率负载扰动下控制参数影响稳定性的分析方法,进一步给出控制参数的可行域。最后,利用PLECS软件搭建了恒功率负载下双环控制的交直流配电系统,仿真及实验验证了所提方法的有效性。With the rapid development of flexible AC/DC distribution systems,the large-scale access of nonlinear elements such as power electronic devices and constant power loads make the transient stability problem of the system increasingly serious.Firstly,a mathematical model of AC/DC distribution system with constant power loads based on AC/DC and DC/DC converters connected in parallel under double-loop control is established,and a nonlinear Taylor expansion of the system is carried out.Secondly,the original high-order system is decoupled into a series of low-order subsystems based on the nonlinear decoupling theory.The dominant decoupled subsystem is identified and analyzed in terms of transient stability by using the phase-plane method and the inverse trajectory method,and the validity of the theoretical analysis is verified by physical simulation.Then,the concept of the nonlinear participation factor is introduced based on the principle of nonlinear decoupling,and the participation factor of the state variables is calculated,so as to put forward the analytical method of the control parameters affecting the stability under the constant power load perturbation,and further give the feasible domain of the control parameters.Finally,an AC/DC distribution system with double-loop control under constant power load is constructed by using PLECS software,and simulation and experiment verify the effectiveness of the proposed method.

关 键 词：交直流配电系统 非线性解耦 暂态稳定性 时域仿真法 可行域 

分 类 号：TM721.3[电气工程—电力系统及自动化] TM712