基于泛正态阻抗云的谐波发射水平估计

提出了一种基于泛正态阻抗云的用于估计系统侧谐波阻抗及谐波电压发射水平的方法。首先,从波动量法的基本原理入手,通过理论分析得出利用波动量比值计算系统谐波阻抗的关键是辨识出更接近于系统谐波阻抗的波动量比值样本;其次,通过对波动量比值概率分布特征的研究,提出其泛正态分布的特征满足正态云模型的适用条件,从而利用逆向云发生器计算云的数字特征;最后,基于云模型的"3En'规则",确定阻抗筛选阈值,进而由筛选合格的样本估计系统谐波阻抗及谐波电压发射水平。对理论模型的仿真和实际工程算例的验证证明所提方法的准确性和有效性。

Assessment Method of Harmonic Emission Level Based on Pan-normal Harmonic Impedance Cloud

This paper proposes a new method to estimate system harmonic impedance and harmonic emission level based on the pan-normal impedance cloud.First of all, based on the basic principle of fluctuation method, it can be obtained that the key to estimate the system harmonic impedance is how to identify fluctuation ratio samples closer to the true value through theoretical analysis;Secondly, through studying the probability distribution of fluctuation ratio, this paper finds that the pan-normal distribution characteristic of fluctuation ratio meets the applicable conditions of normal cloud model so that the digital features of impedance cloud can be calculated by backward cloud generator;Fi-nally, based on the“3En′Rules” of cloud model, the filtering threshold of impedance can be obtained, then the sys-tem harmonic impedance and harmonic emission level can be estimated by filtering qualified samples.Through the simulation of theoretical model and calculation of practical engineering examples, it proves the accuracy and effective-ness of the proposed method.