An Approach to Regulating Dual Series Static Compensator (DSSC)

For power flow control with specific attention to renewable energy resources based transmission in a meshed network, less complex coordinated control can be obtained with the proposed convertible static transmission controller (CSTC) concept which is connected across the substation power transformer and can be reconfigured to the required modes of operation. Dual Series Static Compensator (DSSC) mode or series-series mode available in the CSTC provides superior performance in terms of operating characteristics compared to conventional power flow controllers. In this paper, detailed steady-state and dynamic performance of DSSC will be investigated, and the control structure of DSSC will be proposed to control active and reactive power independently. This paper specifically explores the challenges of the proposed control method. In particular, the proposed control structure is based on line current PLL. The dynamic performance of DSSC is further investigated in PSCAD/EMTDC environment.