Method and a controller arrangement for power supply control

摘要

A method of maintaining a balanced filter bus voltage on a filter bus that is fed by at least two voltage source converters connected to the filter bus via a respective inductor. The method comprises regulating a negative sequence voltage on the filter bus by drooping each filter bus negative sequence voltage reference vector component against the corresponding orthogonal negative sequence current vector component. By balancing the load(s) on the filter bus, load sharing among the voltage source converters may be achieved by means of existing methods even in the presence of unbalanced loads. A controller arrangement is furthermore presented herein.