Energy optimization techniques of static series compensator for constant power factor loads

The phase advance compensation (PAC) has been proposed in literature in order to minimize the injected active power by the static series compensator (SSC) for mitigation of the voltage dips. However, in some cases, the PAC may fail to minimize the active because of the load power factor. This paper discusses and compares four different compensation strategies in order to ensure the minimization of the active power: 1) voltage difference compensation; 2) in-phase compensation; 3) phase advance compensation; 4) progressive phase advance compensation. The effect of the load power factor is investigated on the compensation techniques. A control algorithm based on a combination of the four strategies is proposed taking into account the minimization of the active power and keeping the injected voltage within the ratings of the SSC. PSCAD/EMTDC simulation results are presented to verify the proposed algorithm.