The Research Of The Interharmonic Responsibility Quantitative Method

With the increasing of nonlinear loads in power system,the situation of interharmonic pollution becomes more and more serious.Quantizing the responsibility of interharmonic sources will help establishing a scientific and standardized power quality management system.Extrating interharmonic parameters is the precondition of interharmonic analysis,this paper studies the disadvantage of traditional IEC measuring method and put forwards Prony method.To determin interharmonic contribution effectively,this paper researches three kinds of responsibility index,interharmonic current,voltage and active power respectively.Firstly,according to the difference of the distribution characteristics between different interharmonic sources,this paper structure the Monte Carlo method which is based on kernel estimate and important sampling to calculate the same frequency current of multiple harmonics loads,and calculate the interharmonic current responsibility according to the principle of vector superposition.Then using the active power flow method to locate the interharmonic sources,if the interharmonics come from the electricity users,the power responsibility will be computed among the users.One interharmonic load power responsibility is defined as the proportion of the concerned interharmonic avtive power in all the interharmonic active powers in the bus.Finally,about the traditional interharmonic voltage responsibility,the key lies in the accurate calculation of the equivalent interharmonic impedance.This paper proposes a method that combined the group regression and k-means clustering,using the selection of clustering centers instead of manual intervention to calculate it.An example simulation proved that this method is validity and accuracy by PSCAD/EMTDC.