A Voltage Source Converter And A Method For Operation Thereof

Abstract: A voltage source converter comprises at least two half bridges (15) each having two current valves (21, 22) connected in series and configured to be connected to opposite poles (6, 7) of a DC source/load. Each half bridge has a gate drive unit (32) configured to control a semiconductor device of a current valve each to turn on and off. Each gate drive unit (32) includes an arrangement (36) configured to carry out voltage measurements for providing a value of the DC voltage between said opposite poles (6, 7). Each said arrangement comprises a voltage divider (37) connected across the two current valves of the respective half bridge so as to measure the entire DC voltage between the opposite poles and each voltage divider has an output connected to processing parts (38) delivering a digital signal representing a value of the DC voltage between the poles. At least two gate drive units (32) are configured to send a said digital signal to a calculating unit (54) configured to carry out a quality estimation of these digital signals and to calculate a said DC voltage value from these signals while giving each signal a weight corresponding to the quality value adhered thereto and then forming a weighted average value.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents