전압 불평형에 의한 전력 변동 분석

Voltage unbalance is mainly defined as the ratio of the negative sequence voltage to the positive sequence voltage. Voltage unbalance is generated by the unbalance of power fluctuation or load in the distribution line. If the magnitude and phase of the voltage on the supply side change due to a change in the single-phase load in a 3-phase 4-wire system where a single-phase load and a three-phase load are used together, a voltage unbalance will occur. Current unbalance can be high even at the lower voltage unbalance. Voltage and current unbalance are closely related to the power unbalance. Power unbalance is also related to load unbalance and can have a significant impact on the operating characteristics of the load In this paper, we analyzed for the load unbalance and power changes under the symmetric and asymmetric voltage unbalance.