一种谐波负荷建模的新方法

精确的负荷谐波建模对于网络谐波分析具有重要意义.文中叙述了负荷谐波建模的研究现状,针对理论上通用的负荷谐波模型,根据函数最佳平方逼近的思想,提出了一种新的参数辨识方法,即利用模型中电压、电流之间的物理关系,通过对电流的最佳平方逼近辨识出相应参数.该算法简单易行,可对各种类型的负荷进行谐波建模.为检验算法的精确度,定义了误差分析函数.该算法与以往算法相比,具有更高的精度,验证了算法的有效性和可行性.最后,讨论了电压、电流的幅值和相角对辨识所得参数的影响.

A New Approach for Harmonic Modeling of Electric Loads

Accurate load modeling for harmonic analysis is of great importance.With helps of researches on power loads modeling,a new method based on the inherence between voltage and current is presented to identify the load model parameters by approximating current with the best quadratic approximating algorithm.This method is simple,easily operated and nearly suitable for all types of harmonic modeling.A function for error analysis is defined to verify the accuracy of the method proposed.The numerical results of the given examples show a higher accuracy of the proposed technique compared to the previous time-domain load modeling techniques.Hence,the validity and feasibility of the method proposed are identified.Finally,influences of the parameters of voltage and current on the load parameters are investigated.