Line Loss Minimization and Current Regulation in a Loop Distribution System using Full-bridge Series Compensator

This paper proposes a power flow controller for minimizing line losses and regulating line current in a loop distribution system. The controller employs a full-bridge circuit connected in series with a power line and operating at the line frequency, which achieves high-efficient operation. This paper shows the operational strategy of the controllers and verifies the effectiveness of line loss minimization and line current regulation. The experimental verification conducted on a 200 V downscaled loop distribution system reveals the proposed loss-minimizing operation can reduce total line loss by 2.3% and the losses of the power flow controllers are negligible compared to total line loss. The simulation based on a 6.6 kV loop distribution system demonstrates that the proposed current regulating operation has been completed within 80 ms. Additionally, the simulation result shows that the loop distribution system can reduce total loss by 66% compared to the radial distribution system in case of load imbalance due to reverse power flow.