A Harmonic Currents Compensation Strategy of Active Load Balancer With Constant DC-Capacitor Voltage Control on Three-Phase Four-Wire Distribution Feeders

摘要

This paper deals with harmonic currents compensation strategy for Active Load Balancer (ALB) with constant dc-capacitor voltage control on three-phase four-wire distribution feeders. Only the constant dc-capacitor voltage control, which is commonly used in the active power line conditioners(APLCs), is used to compensate unbalanced active, reactive and harmonic currents on three-phase four-wire distribution feeders. Any calculation blocks of the active, reactive and harmonic components of the load currents are not needed. The basic principle of the constant dc-capacitor voltage control strategy for the ALB is discussed in detail. The instantaneous power flows into ALB shows that balanced and sinusoidal source currents with a unity power factor are achieved with the constant dc-capacitor voltage control based algorithm. The validity and high practicability of the proposed strategy are confirmed by digital computer simulation using PSIM software. Simulation results demonstrate that balanced and sinusoidal source-currents with a unity power factor are achieved using the proposed control algorithm.