Voltage unbalance compensation using new structure of decouple double synchronous reference frame in stand-alone microgrids

摘要

In distribution networks, the voltage unbalance occurrence is inevitable. The voltage unbalance can have negative impacts on the customer equipment and the network performance if it exceeds the permissible limit. This study proposes a novel control strategy to compensate for the voltage unbalance in stand-alone microgrids. The proposed control method applies to the inverter-interfaced distributed generation units. The suggested control strategy is based on the decouple double synchronous reference frame (DDSRF) that is modified to improve its effectiveness. The modified DDSRF can effectively decouple the positive and negative sequence components. The simulation results depict that the proposed control strategy provides faster dynamic response and more effective voltage unbalance compensation comparing to the DSRF-based control method.