微电网谐波特性分析及影响研究

Research on Harmonic Characteristics Analysis and Influence of Micro-Grid

考虑到微电网不同的运行方式与其中的微源特性,用户侧不同类型的非线性负载接入微电网时会对电能质量产生不利影响,其中带来的谐波问题尤为明显。基于谐波产生的机理,进行微电网建模及仿真分析非线性负荷投切对微电网产生的谐波特性。同时开展微电网运行及半实物仿真试验,对采用对等控制并且内部包含模拟风机、储能电池、光伏电源的微电网模型进行测试,在并网、离并网转换、离网运行模式下得到投入常规负荷和非线性负荷谐波数据,分析出微电网在不同运行状态下的谐波特性。

Considering the different operating modes of micro-grid and the characteristics of micro-source,different types of nonlinear load on the user side have an adverse impact on power quality when they connect to the micro-grid.The harmonic problem is particularly obvious.Based on the mechanism of harmonic generation,this paper firstly models and simulates the micro-grid and analyzes the harmonic characteristics of the micro-grid caused by nonlinear load switching.At the same time,the micro-grid operation model composed of wind turbines,photovoltaics,energy storage and other micro-sources and adopts peer-to-peer control is used to carry out micro-grid harmonic testing.Its on-grid and off-grid operations are analyzed,and the harmonic data of linear load and nonlinear load under different operating conditions are compared.It analyzes the characteristics of the harmonics of the micro-grid being different in different motion states.