Optimization based voltage unbalance compensation in the microgrid

Voltage unbalance has become a common issue in the low voltage ac microgrids due to the rapid enhancement of penetration of single phase loads and unbalanced loads into the distribution system. The negative sequence voltage of the load buses increases due to the presence of unbalanced loads which is not desirable as it causes voltage quality reduction in the system which leads to extra power loss and even makes the system unstable by creating disturbances during the system operation. Therefore, in this study an optimization based unbalance voltage compensation approach for grid connected microgrid is proposed. The distributed generators (DGs) in the microgrid are used as compensating devices and Artificial Cooperative Search (ACS) algorithm is used to generate the optimal references for the DGs. The voltage quality at each load bus can also be customized according to the consumer.