FAULT RIDE THROUGH IN A MARINE POWER DISTRIBUTION SYSTEM

摘要

A power distribution system (30) having one or more phases is described. The power distribution system (30) has a power converter (46) with a plurality of semiconductor switching devices per phase, a PWM controller (52), and a current limitation controller (58). The current limitation controller (58) is adapted, at least when a short-circuit fault is detected, to compare a measured current (Ia, Ib, Ic) for each phase with a reference current (Ia_max, Ib_max, Ic_max) for the corresponding phase. If the comparison is located outside a predetermined current range centred about the reference current (Ia_max, Ib_max, Ic_max) for the corresponding phase, the current limitation controller (58) will allow the semiconductor switching devices of the corresponding phase to be turned on and off by the PWM controller (52). Otherwise, if the comparison is located inside the predetermined current range, the current limitation controller (58) will control the semiconductor switching devices for the corresponding phase to be turned off irrespective of the PWM control strategy applied by the PWM controller (58).