Preferably, said active voltage limiter unit is further configured to regulate said current references of said regulator system in order to cause said DC-link capacitor voltage to be limited within said predetermined voltage range, without using said lines currents and/or DC-link currents. Preferably, said active voltage limiter unit is further configured to clamp said DC-link capacitor voltage to a prefixed value, when said electric motor regenerates back current to said the DC-link capacitor via said electrolytic capacitor-less inverter. Preferably, said active voltage limiter unit is further configured to: determine an active current based on said output currents and said duty cycles; regulate said current references based on said active current and said DC-link capacitor voltage. Preferably, said active voltage limiter unit is further configured to determine a first active current based on the d-q axis-wise duty cycles which are indicative of said duty cycles of the switching signals and d-q axis-wise currents indicative of said output currents Preferably, said active voltage limiter unit is configured to determine a second active current based on the d-q axis-wise duty cycles indicative of said duty cycles of the switching signals and said determined current references. Preferably, said active voltage limiter unit is further configured to determine said active current by computing a minimum current between said first and second active currents. Preferably, said active voltage limiter unit is further configured to determine two maximum absolute correction signals on the basis of said second active current and said d-q axis-wise duty cycles. Preferably, said active voltage limiter unit is further configured to determine an instantaneous maximum allowable regeneration current based on a measured voltage level and a parameter indicative of a maximum absolute active current for regeneration. Preferably, said active voltage limiter unit is further configured to determine an instantaneous maximum allowable regeneration current based on the following equation