A Method of Calculating the RI from HVDC Converter Stations

Radio Interference ( RI), generated due to the periodic switching of the valves, is an important factor in the design of HVDC converter stations. A method is developed in this paper for calculating the RI level of any given converter station layout. The method consists basically of determining the equivalent circuit for the valve turn-on transients, analyzing the currents as a function of frequency in all elements of the circuit, and finally calculating the RI around the station using the currents obtained above together with data on the physical layout of the station.