Development of New Automatically Tuned Filter for HVDC Converter Station

This paper proposes a new type of automatically tuned filter for HVDC Converter Station. The proposed method is largely based on the existing and reliable technologies, i.e. oil which is the most common insulation medium and the electromagnetic shield and coil configuration which is used for the air-core reactor.The automatically tuning is achieved by changing the mutual inductance by opening and closing two or more cover coils (short-circuit coil) between the air-core coil and electromagnetic shield. The basic performance was confirmed through the shop tests of a prototype reactor and a small scale automatically tuned filter system.