Active $du/dt$—New Output-Filtering Approach for Inverter-Fed Electric Drives

Active
du
/
dt
is a new output-filtering method to mitigate motor overvoltages. The inverter pulse pattern edges are broken down into narrower pulses, which control the filter
LC
circuit. This results in an output voltage that does not have to exhibit the overshoot typically seen in common
LC
circuits in output-filtering applications. Furthermore, the shape of the output-voltage edge has properties well suited for output-filtering applications. An appropriate filter rise time is selected according to the motor-cable length to eliminate the motor overvoltage. The basis of the active
du
/
dt
method is discussed in brief. Considerations on the application of the active
du
/
dt
filtering in electric drives are presented together with simulations and experimental data to verify the potential of the method.