Imbalance Reduction of Three-phase Line Current Using Reactive Power Injection of the Distributed Static Series Compensator

This paper proposes the imbalance reduction algorithm for a three-phase line current in the power transmission system using distributed static series compensators (DSSCs). The DSSC compensates reactive power by injecting a reactive voltage into the transmission line, which can control the magnitude of the line current. In the proposed algorithm, the three-phase line current becomes equally balanced by adjusting the magnitude of the injected reactive voltage. By doing so, the power transmission capability of the transmission line is improved. To verify the performance of the algorithm, the simulations are done by PSIM software, and the experiments are conducted using the scaled down transmission system with the DSSC prototype modules. Both the simulations and the experiments show that the proposed algorithm can effectively compensate significant imbalance conditions.