Popular high-speed power flow controller

摘要

(57) Abstract First and second DC links, preferably voltage-driven inverters, are respectively connected in parallel and in series to a transmission line by a coupling transformer. The firing of the GTO thyristor of the first inverter is controlled to control the reactive power of the transmission line and to satisfy the active power requirement of the second inverter. The second inverter controls the magnitude and the phase angle with respect to the transmission line voltage in order to selectively adjust any one or more of the transmission line voltage magnitude, transmission line impedance and transmission line voltage phase angle. Is controlled to inject a voltage adjustable between 0 ° and 360 ° into the transmission line in series. In the high power configuration of the controller, each inverter includes a plurality of six-pulse inverter modules connected by an interstage transformer to form a balanced group of higher-order pulses, which groups are pulse-width modulated. Alternatively, an appropriate AC voltage is generated by adjusting the phase between the two groups.