TRANSMISSION LINE POWER CONTROLLER WITH A CONTINUOUSLY CONTROLLABLE VOLTAGE SOURCE RESPONSIVE TO A REAL POWER DEMAND AND A REACTIVE POWER DEMAND

摘要

A transmission line power controller (50) for controlling the flow of electric power in an alternating current three-phase transmission system (34) is described. The power line controller (50) includes a parallel inverter (22) connected to a series inverter (24) through a dc link (26). The parallel inverter (22) is connected in shunt to the transmission system (34) through a shunt transformer (36). The series inverter (24) is connected in series with the transmission system through a series transformer (38). A transmission line power control circuit (52) is used to specify a desired real power demand and reactive power demand for the transmission system (34). The power control circuit (52) processes this information along with a transmission line voltage vector and a transmission line current vector to produce a voltage source reference signal that is applied to the series inverter (24). In response to the voltage source reference signal, the series inverter (24) produces an injected voltage vector into the transmission system (34). The injected voltage vector forces the transmission line current vector to a desired value corresponding to the specified real power and reactive power demand. Thus, desired real power and reactive power flow is rapidly achieved on the transmission system (34).