Converter device and method for converting electrical power

It is described a converter device (102) for power conversion in e.g. a power plant such as a wind turbine. The converter device is configured for converting an input power (106) to an electrical output power (108). The converter device (102) may be configured for receiving mechanical input power or, according to another embodiment, may be configured for receiving electrical input power. The converter device (102) comprises a controller (116) which is configured for setting a phase angle between a voltage and a total current of the electrical output power (108) to a predetermined value if the voltage indicated by the voltage signal is outside a predetermined voltage band.