Electrical converter with high machine side common mode voltage

A controller for an electrical converter, the electrical converter comprising a first inverter for converting a first multi-phase AC voltage into a DC voltage and a second inverter for converting the DC voltage into a second multi-phase AC voltage, the controller operable to:

• switch the first inverter such that a first common mode voltage is generated in the first multi-phase AC voltage, wherein the first common mode voltage has a frequency, which is a multiple of three times a fundamental frequency of the first multi-phase AC voltage;
• switch the second inverter such that a second common mode voltage is generated in the second multi-phase AC voltage, wherein the second common mode voltage has the same frequency as the first common mode voltage, and wherein the second common mode voltage is reversed with respect to the first common mode voltage.