A thyristor-controlled static condenser with the double-firing phase control

A current-source-type static condenser (Statcon) employing ordinary thyristors for controlling the reactive power of the power system is studied, and the double-firing phase-control method is characterized. The double-firing phase-control method can control the active and the reactive power of the Statcon directly and independently, so that the maximum speed of response can be achieved. However, the level of harmonics is still too high to be used practically, therefore, the 12-pulse configuration is considered for further reducing the harmonics. The thyristor-controlled Statcon can be useful in very-high-power applications in which the gate-turn-off (GTO) Statcon may not be evaluated as being economical.