A thyristor controlled static condenser with new 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 a new double firing phase control method is proposed, which makes it possible to control the active and the reactive power directly and independently without any sacrifice of the harmonic characteristics, so that the maximum speed of response is achieved. The 12-pulse configuration is considered for reducing the harmonics further. The main advantage of the thyristor controlled Statcon is that the high power technology of the power circuit configuration has been established through the experiences of high voltage DC (HVDC) transmission systems, so that the thyristor controlled Statcon with the proposed double firing phase control method is expected suitable for very high power applications in which gate turn-off (GTO) Statcons may not be evaluated economical.