电动汽车高频充电机的谐波特性分析

电动汽车充电机作为非线性负荷大量接入电网会对电网提出很多新的挑战,将会对电网造成谐波污染。本文首先分析了高频充电机的功率需求,建立功率需求模型,在此基础上分析充电机功率特性和谐波电流的组成及其影响因素,搭建充电机接入电力系统的谐波分析模型。运用Matlab的Simulink和Sim Power Systems工具箱面向系统电气原理结构图的仿真方法,对系统进行了仿真分析,得到了单台高频充电机所产生的谐波的规律和特点。为预测充电站谐波污染情况,采取合理谐波抑制措施提供理论基础。

Analysis on Harmonic Characteristics of Electric Vehicle High-frequency Charger

As a nonlinear load,a large number of electric vehicle chargers inserted into power grid might bring many challenges and cause harmonic pollution to power grid.In this paper,power demand of a high-frequency charger is analyzed,and the model of power demand is built.Based on the results,the power characteristics of the charger,harmonic current and impact parameters are analyzed,and the harmonic analysis model of the charger accessed to power grid is built.Applying the Simulink and SimPowerSystems toolbox in Matlab and the simulation method facing the system's structure of electrical principle,the model is simulated.The harmonic generative rules and characteristics for a single high-frequency charger are present.The results might forecast the harmonic pollution of charge station,and provide the theory base for choosing harmonic control device and methods.