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Three-Phase Current Balancing Strategy with Distributed Static Series Compensators
윤한종,윤동관,최동민,조영훈 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
This paper proposes a three-phase current balancing strategy in a power transmission system employing distributed static series compensators (DSSCs). With the proposed variable quadrature voltage injection method, the DSSC emulates either an inductive or a capacitive impedance into the transmission line, and the magnitudes of the phase currents are balanced. Hence, the phase imbalances in the power transmission system are significantly reduced. As a result, the power transfer capability of the transmission lines can be improved. The operational principle of the DSSCs, the hardware structure and the control algorithm are described in detail. Finally, the theoretical analyses and the proposed strategy are experimentally verified through a scaled down transmission system with DSSC prototypes.
윤한종,조영훈 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
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 eff ectively compensate signifi cant imbalance conditions.