System, a control unit and a method for controlling capacitors in the system in an at least partly electrical driven vehicle

A method for performed by a control unit for controlling capacitors in a system in an at least partly electrical driven vehicle, the system comprises:

• a converter comprising a first capacitor connected to a first side of a three-phase bridge, wherein the first capacitor comprises at least one of a first pole-chassis filter capacitor connected to a positive pole of a power supply and a ground plane, and a second pole-chassis filter capacitor connected to a negative pole of the power supply and the ground plane;
• a third capacitor adapted to be controlled, via a first switch, to be either connected in parallel to or disconnected from the first capacitor,
• the method comprises:
• detecting that the converter is activated and is initiated to start operating;
• when it has been detected that the converter is activated and is initiated to start operating, triggering the first switch to enter a closed position such that third capacitor is connected to the first capacitor to be connected in parallel to the at least one pole-chassis filter capacitor before the converter starts operating;
• detecting that the converter is inactivated and is not in operation;
• and
• when it has been detected that the converter is inactivated and is not in operation, triggering the first switch to enter an open position such that the third capacitor is disconnected from the first capacitor by being disconnected from the at least one pole-chassis filter capacitor.