The Method of Power Factor Calculation under Non-Sinusoidal Conditions

The method of power factor calculation under non-sinusoidal conditions is presented in the paper. The proposed method is based on the existing relationships between the components of apparent power under non-sinusoidal conditions. The equation for determination of total power factor under non-sinusoidal conditions is obtained and proved. This equation allows the harmonics from power source and connected load to be taken into account during calculation of the total power factor. A mathematical model of power supply system with harmonic distortions both from source and load side is developed for validation of the obtained equation. On the base of the modeling results the regularities that reflects the dependence of total power factor components on the internal impedance of power source and the correlation between rated powers of the existing in some point linear and non-linear loads. In such case the developed method and obtained equation is reasonable to use for the assessment of the influence of some active, passive or hybrid harmonic correction device on the total power factor components under non-sinusoidal conditions.