A New Filter Concept for High Pulse-Frequency 3-Phase AFE Motor Drives

Stefan Hoffmann, Matthias Bock and Eckart Hoene
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Stefan Hoffmann: Fraunhofer IZM, Gustav-Meyer-Allee 25, 13355 Berlin, Germany
Matthias Bock: Faculty IV—Electrical Engineering and Computer Science, Technische Universität Berlin, Sekr. TIB 4/2-1, Straße des 17. Juni 135, 10623 Berlin, Germany
Eckart Hoene: Fraunhofer IZM, Gustav-Meyer-Allee 25, 13355 Berlin, Germany

Energies, 2021, vol. 14, issue 10, 1-22

Abstract: The size of back-to-back converters with active front end is significantly determined by the size of the passive filter components. This paper presents a new complete EMC filter concept for this type of converter system that is effective on the input and the output. This involves filtering the main common mode interferences from the grid and motor sides with a single CM choke. Since only the difference of the generated common mode voltage-time areas of both converters is absorbed by this component, the size of the required filter can be greatly reduced compared to conventional filter concepts. The concept is validated on a grid feeding inverter that can be connected to the public distribution network with an output power of 63 kW. The size reduction is demonstrated by means of a design example on a system with the same power and electrical requirements. It is elaborated why, applying the new filter concept, the impedance of the DC link potentials to ground and other electrical potentials should be as high as possible and therefore associated parasitic capacitances should be minimized. From this requirement, rules for the design of the power modules of PFC and motor converters for the application of this filter concept are derived.

Keywords: EMI filter design; electromagnetic compatibility; power electronic converters; motor drives; active front end; filter topology; CM filter; volume minimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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