The present invention relates to a method of operating a dual fed system where power is supplied to a electrical load (T1) from first and second ac busbars (2a, 2b) at a ratio that achieves a desired level of exhaust emissions such as nitrogen oxides (NO x...

The system has a control lever (1) whose setting represents a desired power, a demand value generator (2) specifying a demand value depending on the lever setting and a revolution rate control loop (3,4) for controlling a motor using the demand value. The ...