단상 비선형 부하에 수동형 필터의 설치전후 역률 변동에 관한 연구

Abstract

The customer uses non-linear loads as well as linear loads. A linear load, such as an induction motor, is usually an inductive load with a power factor that is not high. Therefore, capacitors are used to compensate the low power factor of the inductive load to a certain level. A nonlinear load, such as a converter, generates a harmonic current during the power conversion process. Harmonic currents generated by a single phase nonlinear load in the three-phase four-wire system are affected not only by an increase in loss and a decrease in output, but also to an adjacent phase flowing to a neutral line. Recently, the proportion of single-phase nonlinear loads is increasing due to the increase in the number and capacity of DC device and DC power sources such as TVs, computers and UPS. If a passive filter is used to reduce the harmonic current, the capacitive component of the capacitor corresponding to the reactive power can affect the power factor. Under light load conditions, such as holidays and nights, the capacitive component of the capacitor can lead the power factor ahead.BRIn this study, we analyze how the power factor is changed by parameter change of passive filter installed to reduce harmonic current when using single-phase nonlinear load in the three-phase four-wire system.