Patent ID: 8421386
Filing Date: 2013-04-16
Classification: H02P

Abstract:
1. A control apparatus for controlling a control quantity of a polyphase rotary machine by operating an electric power converter circuit comprising a plurality of switching elements coupled to respective phases of said polyphase rotary machine, the electric power converter circuit including means for supplying current at a plurality of respectively different DC voltage levels, said switching elements being controlled for selectively connecting each phase of said polyphase rotary machine to said plurality of DC voltage levels, and said control apparatus comprising prediction circuitry configured for predicting future values of said control quantity based on respective assumed operation states of said power converter circuit, said operation states comprising respective combinations of connection statuses of said phases to said plurality of DC voltage levels, and operation control circuitry configured for determining a future operation state to be established for said electric power converter circuit, with said determination based upon said predicted future values of said control quantity; wherein said operation control circuitry is configured to execute said determination such that a specific changeover requirement is satisfied, whereby no more than one of said phases becomes connected to a changed voltage level when a changeover occurs from a present operation state of said power converter circuit to said future operation state.