| 摘要 |
A time-discrete pulse-width modulation control equipment for a voltage source converter, in particular a 3-level or a 2-level converter, has means (IREG) for generation of an AC-voltage reference template (UVa_R, UVb_R, UVc_R, UVabc_R, UV alpha beta _R) for a voltage (UV) to be generated by the converter. The control equipment has first means (48) for determination of a sample period time (Ts) in dependence on an input signal representative of a frequency. The control equipment comprises phase-locking means (47) for synchronising the sample instants and the reference voltage template so that for a 3-level converter the phase positions 0 DEG and 180 DEG of the reference voltage template each coincide with a sample instant, and for a 2-level converter the phase positions 0 DEG and 180 DEG of the reference voltage template each coincide with an instant in time corresponding to a sample instant that is displaced in time with half the sample period time. <IMAGE> |
