Optimal firing-angle control of cascaded HVDC converters for minimum reactive power demand

Abstract

An asymmetrical firing strategy for the cascaded converters of a HVDC link is proposed, resulting in minimum reactive power compensation at both ends of the dc link. Both 6-and 12-pulse converters, in unipolar and bipolar operation, are considered. In addition to reactive power reduction, ac and de harmonics are greatly reduced.

A comprehensive approach to classify reactive power consumption in transmission technologies

“…As a contribution to this subject, this paper uses a common mathematical classification [3] to assemble all physical phenomena, which contribute to the reactive power consumption of the three available technologies for bulk power transmission. In contrast to other publications, where phase difference is assumed to be the only root for reactive power [4], a holistic approach towards reactive power demand of transmission technologies is conducted in this paper. A general investigation on the functional chains concerning reactive power of the involved electrical equipment gives a fine hint to take appropriate steps in the process of achieving balanced reactive power consumption.…”