ELECTRIC DRIVE SYSTEM

An electric drive system includes at least one electric drive unit. The at least one electric drive unit includes an electric motor and inverters. The inverters are each supplied with DC voltage via a high-voltage bus. The electric drive system also includes a main battery system that has a plurality of battery modules that supply DC voltage to each of the high-voltage buses. The electric device system includes a plurality of reserve batteries. A separate reserve battery of the plurality of reserve batteries is provided for each high-voltage bus. The drive system is configured to make a change to the supply of DC voltage when a corresponding control signal is present for each of the high-voltage buses. A change is made from a supply of DC voltage of the battery module of the main battery system that is assigned to the high-voltage bus to a supply of DC voltage of the reserve battery assigned to the high-voltage bus. A method for supplying DC voltage of a reserve battery to a high-voltage bus is also provided.