Patent Number: 6,480,403

Title: HVDC device for converting between alternating voltages and direct current voltages

Abstract: A device for converting alternating voltage to direct voltage and, conversely, direct voltage into alternating voltage. A series connection between the poles of a direct voltage side has at least four units each having a semiconductor element of turn-off type and a first diode connected in anti-parallel therewith. A first midpoint of the series connection is connected to an alternating voltage phase line and forms a phase output. Second midpoints of the series connection are connected to a midpoint of the direct voltage side through such units. An apparatus is adapted to control the semiconductor elements with a pulse width modulation frequency of at least one order of magnitude higher than the fundamental frequency of the alternating voltage of the phase line and the rest of the semiconductor elements with a frequency substantially lower and within or close to the frequency range of one or a couple of times of the fundamental frequency.

Inventors: Bijlenga; Bo (Skultuna, SE)

Assignee: ABB AB

International Classification: H02M 7/48 (20060101); H02M 005/42 ()

Expiration Date: 11/12/2019