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AssigneeSchneider Toshiba Inverter Europe SAS
InventorsHocine Boulharts, Rudolf Fehringer
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The invention relates to a method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said method consisting in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor so as to minimize an overvoltage level, said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1−n, and the method includes the following steps in particular: determining the number of successive pulses of said sequence; determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).
Method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said cable (Cx) comprising at least two conductors and exhibiting an impedance and said filter being an LC filter and comprising at least one inductor (Lf) and one capacitor (Cf) for each conductor of the cable, said converter comprising at least two switching arms each comprising at least two power switches that are switched so as to chop a DC voltage having a value E in order to deliver at least two voltage levels, the controlling of a switching arm making it possible to generate voltage pulses on the output phase that is connected thereto, a voltage pulse potentially being an increasing voltage pulse and including a rising vertical voltage edge or being a decreasing voltage pulse and including a falling vertical voltage edge, said method being characterized in that it consists in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor on each switching, transition of the two power switches of one and the same switching arm so as to minimize an overvoltage level across the terminals of the electric machine (M), said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1−n, and in that it includes the following steps:
System for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said cable (Cx) comprising at least two conductors and exhibiting an impedance and said filter being an LC filter and comprising at least one inductor (Lf) and one capacitor (Cf) for each conductor of the cable, said converter comprising at least two switching arms each comprising at least two power switches that are switched so as to chop a DC voltage having a value E in order to deliver at least two voltage levels, the controlling of a switching arm making it possible to generate voltage pulses on the output phase that is connected thereto, a voltage pulse potentially being an increasing voltage pulse and including a rising vertical voltage edge or being a decreasing voltage pulse and including a falling vertical voltage edge, said system being characterized in that it is suitable for determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor on each switching transition of the two power switches of one and the same switching arm so as to minimize an overvoltage level across the terminals of the electric machine (M), said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1−n, and in that it is, also suitable for:
Dependencies are inferred from the claim text.