中文摘要：

通过研究光伏并网对电网电压畸变的影响机理,本文提出了基于电流注入法的电网谐波电压畸变分析方法。建立了光伏并网系统的谐波源模型,将光伏电源等效为谐波电流注入源,推导出光伏谐波注入源与配电网各点谐波电压畸变率的关系式,得出光伏电源接入位置和有功出力对电网谐波电压的影响关系。对含多个光伏电源接入的配电网谐波分布特性和相互影响关系进行了理论分析与仿真,得出光伏电源接入后的谐波分布规律,并验证了本文方法的正确性。

英文摘要：

The voltage distortion influence mechanism of photovoltaic grid-connected system is studied in this paper. The harmonic voltage distortion analysis method is presented based on the current injection method. The harmonic source model of the photovoltaic grid-connected system which is equivalent to the harmonic current injection source is established. The relation formula of the photovoltaic harmonic injection sources and voltage distortion rate of each node of the distribution network is obtained. The relationship between the interconnected location of photovoltaic source and the active power output to the harmonic voltage of the power network is also obtained. The harmonic distribution characteristics and interaction relationship are studied when multiple photovoltaic sources are connected to distribution network,and the harmonic distribution law is also obtained. The correctness of the method presented in this paper is verified by comparing theoretical analysis with simulation results.