中文摘要：

针对非线性负荷影响配电网电能质量的问题,首先分析2种典型非线性负荷模型的运行特性,即单相不可控整流滤波电路和单相可控整流滤波电路模型。然后在MATLAB/SIMULINK中建立这2种典型非线性负荷的仿真模型,根据2种模型的特点,改变其内外的因素,观察电源端和负荷端的电能质量。仿真结果表明,任意次谐波电流与各次谐波电压的幅值、相位以及电路的导通角和截止角均有关;同时也说明,配电网出现低电能质量的主要因素是,配电网中有大量非线性负荷存在,即谐波源的存在。

英文摘要：

In view of the influence exerted by nonlinear loads on the power quality of distribution networks, a preliminary analysis has been made of the operational characteristics of two typical kinds of nonlinear load models, i.e.single-phase uncontrolled rectifier filter circuit and single phase controlled rectifier filter circuit model, followed by the establishment of simulation models of these two typical nonlinear load models in MATLAB/SIMULINK. Based on these characteristics, the internal and external factors are modified to observe the power quality of the power supply and the load side. The simulation results show that the amplitude and phase of the harmonic currents are related to the amplitude and phase of each harmonic voltage as well as the conduction angle and the cut-off angle of the circuit. The results also show that the major factor responsible for the low power quality in distribution network lies in the fact that there are a large number of nonlinear loads, namely harmonic source, in distribution networks.