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

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4 Author(s)
Strom, J.-P. ; Inst. of Energy Technol., Lappeenranta Univ. of Technol. (LUT), Lappeenranta, Finland ; Korhonen, J. ; Tyster, J. ; Silventoinen, P.

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.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 9 )

Date of Publication:

Sept. 2011

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