Method for controlling a multi-phase converter with distributed energy storage at low output frequencies

摘要

The invention relates to a method for controlling a multi-phase power converter having at least two phase modules (100) comprising valve branches (T1, . . . , T6) having bipolar subsystems (10, 11) connected in series, at low output frequencies (f). According to the invention, a target value (u1 (t), . . . , u6 (t)) of a valve branch voltage overlaps a common-mode voltage (uCM(t)) such that a sum of two valve branch voltages (u1 (t), U2 (t) or U3 (t), U4 (t) or U5 (t), U6 (t)) of each phase module (100) equals an intermediate circuit voltage (Ud) of said multi-phase power converter. In this manner a known converter having a triphase power converter comprising distributed energy accumulators on the grid and load side, or merely on the load side, may be utilized as a drive converter, which may start up from the idle state.