An improved control scheme for a series-capacitive reactance compensator based on a voltage-source inverter

Power utilities have traditionally used series capacitors to increase the power transfer capability of transmission lines, but their widespread use has been limited by concerns for the harmful effects of series resonances. An advanced, controllable series VAr compensator has the potential to avoid such problems and, therefore, allow more efficient use of existing transmission plant. This paper describes a modified control scheme for an advanced series VAr compensator based on a single voltage source inverter. Practical results from a working prototype demonstrate the ability of the compensator to provide a rapidly controllable magnitude of compensation.