US 7,321,835 B2
Method for improving the mode of operation of a matrix converter
Alain Lacaze, Essert (France); Thierry Lecomte, Offemont (France); Joerg Oesterheld, Birmenstorf (Switzerland); and Massimiliano Visintin, Zurich (Switzerland)
Assigned to Alstom Technology Ltd, Baden (Switzerland)
Filed on Mar. 31, 2005, as Appl. No. 11/95,388.
Claims priority of application No. 10 2004 016 463 (DE), filed on Mar. 31, 2004.
Prior Publication US 2005/0219874 A1, Oct. 06, 2005
Int. Cl. G01R 19/00 (2006.01); H02M 5/32 (2006.01)
U.S. Cl. 702—64  [363/174] 20 Claims
OG exemplary drawing
 
1. A method for operating a matrix converter, comprising:
generating alternating voltage with n phases of a load using a generator having m phases, wherein n<m;
alternatingly connecting the m phases of the generator using a plurality of controllable bi-directional switches arranged in an (m×n) matrix;
switching over from a selected connected phase of the generator to a selected non-connected phase of the generator in a controlled sequence of commutation instants of the individual switches;
calculating an output spectrum so as to generate one of a target voltage curve and a target spectrum of the generated alternating voltage, wherein the calculating is based on at least one of a connectivity of the phases, on a phase relationship between input and output, and on instants when commutations of the switches are initiated and when the commutations of the switches are completed;
assessing an influence of individual commutations or groups of commutations based on calculated deviation output spectra for deviated individual commutations or groups of commutations;
amending the sequence of commutation instants to the at least one of the target voltage curve and the target spectrum using the calculated deviation output spectra, wherein the calculating of the output spectra and the deviation output spectra includes calculating the electromotive force spectra (EMF); and
operating the matrix converter according to the amended sequence of commutation instants.