Method for determining output currents of frequency converter

Details Method for determining output currents of frequency converter Method for determining output currents of frequency converter

2007-03-13

2007-03-13

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S041000

Reexamination Certificate

active

11010568

ABSTRACT:
A method for determining output currents of a three-phase frequency converter comprising a voltage intermediate circuit and three power switch pairs constituting an output of the frequency converter, wherein the power switches constituting a pair are coupled in series between a positive and a negative busbar of the voltage intermediate circuit so that a midpoint of each switch pair constitutes a phase output of the frequency converter. The method comprises, during use of the frequency converter, steps of forming a voltage reference vector for the output power switches such that only two switch pairs are modulated during one modulation sequence, controlling said two switch pairs to implement a voltage reference vector during the modulation sequence by using one zero vector, measuring current of the voltage intermediate circuit of the frequency converter at a predetermined moment in the modulation sequence, and changing actively, during use of the frequency converter, the zero vectors to be used in the modulation sequences.

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