一种基于线性化模型的并网逆变型分布式电源故障特性分析方法

摘要

受逆变型分布式电源功率波动和控制特性的非线性影响,现有的逆变型分布式电源故障特性分析方法存在一定的局限性.在研究现有并网逆变型分布式电源控制策略的基础上,提出了一种适用于多种控制策略的逆变型分布式电源线性压控电流源模型,避免了功率波动对故障分析的影响,同时实现了控制量电压和受控量电流之间的线性化.在此基础上,利用传统故障分析所用的对称分量法和迭代法分析逆变型分布式电源系统的故障特性,并在实际系统中进行了实验验证.%Due to power fluctuations and non-linearization of the inverter-interfaced distributed generator (IIDG),the existing fault analysis method has some limitations.Based on a study of various control strategies,this paper proposes a novel linear voltage controlled current model applicable in multiple control strategies of the IIDG,and the proposed model can avoid the effect of power fluctuations and facilitate linearization of the output current and voltage of the IIDG.Furthermore,the traditional symmetrical component and iteration method is used to analyze the fault characteristic of the IIDG.The theoretical results have been validated by experiment results.