中文摘要：

低压配电系统中非线性负荷的实验研究表明,电压波形的波峰系数（crest factor）是影响非线性负荷谐波Norton模型成立的关键因素,并通过大量的实测数据进行了验证;提出在电压波形呈现平坦特征的低压配电系统中,非线性负荷能用Norton模型进行简化表示。通过实验与仿真分析结果还表明,选择不同的基准电压,通过波动量法计算得到的Norton模型参数的均值也会存在差异,这种差异对谐波潮流分析并没有影响,但却影响评估负荷谐波贡献水平的准确性及可信度。

英文摘要：

According to the experiments which concern about nonlinear loads in low voltage distribution systems, the voltage crest factor has a crucial effect on the establishment of nonlinear load harmonic Norton model, and it is verified by a large number of measured data. In the low voltage system that voltage waveform presents a flat characteristic,the nonlinear load can be simplified by the Norton model. Experimental and simulation results also show that different reference voltages can lead to different mean values of Norton model parameter which is obtained by fluctuation quantity method. The differences don~t have any effect on harmonic load flow analysis,but it affects the accuracy and credibility of the assessment load harmonic contribution level.