Researches on the Noise Models of Valves and DC PLC Filters in UHVDC Transmission Project

Abstract

Ultra-high voltage direct current (UHVDC) converter stations produce high levels of carrier frequency noise which can cause harmful interference to power-line carrier and open-wire carrier systems. The noise models of converter valves and converters arranged with two 12-pulse valve groups in series per pole are given. Calculation results of noise interference on dc pole line and electrode line for the Xiangjiaba -Shanghai UHVDC project (±800kV 6400MIW) based the noise models are presented and discussed. The PLC filter configuration for the UHVDC project meets the requirements of interference limits calculated by the models.