计及控制切换的逆变电源并网系统故障计算方法  

A Fault Calculation Method of the Inverter Grid-connected System Considering Control Strategies Switching

作　　者：马红月 郑涛[1] 周昊 张涛[1] 郝治国[1] MA Hongyue;ZHENG Tao;ZHOU Hao;ZHANG Tao;HAO Zhiguo(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电网技术》2024年第7期2985-2994,I0098,共11页Power System Technology

基　　金：国家自然科学基金项目(U23B20112,52007143);陕西省重点研发计划项目(2022GXLH-01-06)。

摘　　要：并网逆变电源的故障特征受控制策略影响极大,非线性特性显著,传统故障分析方法无法适用。为精确描述故障期间系统电压和电流的变化过程,该文考虑了电力电子换流器的通流能力、故障后的控制策略切换、控制系统的非线性、状态变量的耦合性等因素,提出了一种适用于描述系统时域响应的全状态变量接续求解法。通过控制系统和一次电路的数值积分和微分方程组解析的接续求解得到系统状态量的时域变化全过程。该文以构网型逆变电源并网系统为例,建立PSCAD仿真模型和数学模型,通过仿真结果与该文所提方法的计算结果进行分析和对比,验证了方法的有效性和正确性。The fault characteristics of grid-connected inverter power sources are greatly affected by control strategies,and their nonlinear characteristics are significant,making traditional fault calculation methods unsuitable.To accurately calculate the faults of the grid-connected inverter system,this paper proposes a novel continuously solving method for time-domain system state variables.This method alternatingly solves the numerical solution of the control system and the analytical solution of the differential equation system of the main circuit.The proposed approach considers several factors,including the current capability of the power electronic converter,the control strategy switching after the fault,the nonlinearity of the control system,and the coupling of the state variables.This paper takes the grid-forming inverter as an example to establish the PSCAD simulation model and the mathematical model.By comparing and analyzing the simulation results with the calculation results of the proposed method,the effectiveness and correctness of the method are verified.

关 键 词：故障计算 接续求解 限幅 控制切换 构网型逆变电源 

分 类 号：TM721[电气工程—电力系统及自动化]