An Improved Reactive Power Compensation Scheme for Unbalanced Four Wire System with Low Harmonic Injection Using SVC

摘要

1 Introduction The loads in power distribution system are generally single-phase loads supplied from a A/ Y three-phase transformer with grounded neutral [1]. The other commonly used loads are nonlinear loads, single-phase and three-phase rectifiers, power-electronics-based equipment etc. The increased use of these types of loads generates various power quality problems in the distribution network. These are poor voltage regulation, high reactive power demand, harmonic currents, unbalanced load, excessive neutral current, etc. [2, 3]. The unequal load current due to asymmetrical load contains positive, negative, and zero sequence component. It will increase system losses and can also be harmful on industrial machines and generators. Many techniques are suggested for load balancing as well as neutral current compensation along with load harmonic elimination for three-phase four-wire distribution system.