| 摘要 |
A method for starting the modulation of a frequency converter, which method comprises the steps of receiving reference voltage (s a , s b , s c ; U ref ), generating output switch commands from the reference voltages. The generation of output switch commands comprises further a step, in which the ratio (d z ) of active time (T 0+ ) in a modulation period (T s ) of selected zero vector and the total active time (T 0+ + T 0- ) of zero vectors in a modulation period is changed from a first predetermined ratio, which is substantially 0 or 1, to a second predetermined ratio, which is substantially 0,5. |
