负序和谐波条件下功率因数适用性分析

Applicability Analysis of Power Factor under Negative Sequence and Harmonic Conditions

在负序和谐波条件下,系统中的能量流动更加复杂多变,功率因数计算方法存在争议。为分析负序和谐波条件下功率因数的适用性,首先要确定功率定义是否合理。基于电力系统中功率损耗和视在功率的平方近似满足线性关系这一特性,分别建立不同负载特性下的系统功率损耗模型,通过MATLAB仿真模型分析负序和谐波条件下传统功率理论和等效功率理论的合理性,结果表明在负序和谐波条件下等效功率因数能准确计量系统的功率因数。

Under negative-sequence and harmonic conditions,the energy flow in the system is more complex and variable,and the power factor calculation method is controversial.In order to analyze the applicability of power factor under situations with negative sequence and harmonic,it is necessary to first determine whether the power definition is reasonable.Based on the characteristic that the power loss and the square of the apparent power in the power system approximately satisfy the linear relationship,the system power loss models under different load characteristics are established respectively.The rationality of traditional power theory and equivalent power theory under negative sequence and harmonic conditions is analyzed by MATLAB simulation model.The results show that the equivalent power factor can accurately measure the power factor of the system under negative sequence and harmonic conditions.