An Approach to Load Balancing & Unity Power Factor Control in Multi-phase (Six-phase) Load Circuits Using Multi-phase DSTATCOM

Multi-phase loads, with phases more than three, especially in form of inverter fed induction motor drives suited to high power and specialized applications, are receiving growing attention in the literature. This multiphase source for such drive application may be derived from transformer connection (3 phase to 6 phase) or by DC link six phase inverters. These sources will face the problem of unbalance, harmonic distortion and poor power factor operation. In view of these developments, this paper deals with the supply side load balancing and power factor correction in such load circuits. The proposed compensation scheme uses the shunt current source compensation whose instantaneous values are determined by the instantaneous symmetrical component theory. An ideal compensator in place of physical realization of the compensator has been proposed in the form of a current controlled voltage source inverter. The compensation scheme developed in the paper is tested for their validity on 6-phase 6-wire & 7-wire) circuits through extensive simulations for unbalanced loading, phase outages, and non linear loading. The simulation results of the compensation theory and the ideal compensator verify the compensation method.