Voltage Control and Power Loss Reduction in an Active Distribution Network using Solid State Transformers

Power losses in a distribution network accounts for a major part of energy loss in the overall system. Reduction in power losses can make the power system more energy efficient. This paper analyzes the reactive power support capabilities of Solid-State Transformer (SST) by adopting controls on both sides of SST. Moreover, a Moth swarm algorithm is used for selecting the optimal values of phase angles and modulation coefficients of the Voltage Source Converters (VSCs) on both sides of SST. Results show superior performance of the presented reactive power management scheme in terms of voltage violation and power loss of the system. Moreover, bidirectional power flow enables flexible operation of renewable energy sources (RES). Finally, the performance of the control scheme and optimization algorithm is tested on a modified IEEE 33-bus system using MATLAB.