Comparative Analysis of Unbalanced Three-Phase Grid Current Compensation Methods for the Scott Transformer Based Grid

This paper proposes two control algorithms to solve the three-phase power unbalance problem in Scott transformer based grid, and are power-based current-based compensation method. The method uses active/reactive at load side for control, utilizes secondary current directly eliminate an effect of loss through supply chain. In addition, voltage notch generated by low switching frequency weak grid condition caused is compensated using observer. Performance comparisons methods carried out a real-time simulator 3-level back-to-back converter prototype with 5kVA load. From experimental results, recorded 34.2% rate before reduced 2.8% method, 1.2% study provides new insight into developing advanced which improves electric railway transportation system.