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A strategy is presented for the decoupled control of real and reactive power flows in an energy storage based static series synchronous compensator (SSSC). State-variable based design methods are employed in the basic design, which uses only proportional control. Increased robustness to AC parameter changes is implemented by enhancing this basic design with a control structure that internally uses a state-variable model of the plant. The design is corroborated via electromagnetic transient simulation.