CM & Line-Dm Noise Separation for Three-Level NPC Inverter with Connected Neutral Point for Vehicle Traction Applications

EMI standards limit the noise level for conducted disturbances on DC power cables of electric vehicles. However, designing the EMI filter requires the information about the CM and DM noise levels. Therefore, a separation of the noise is needed. This paper deals with the separation and quantification of the three-phase DM and CM noise for a three-level NPC inverter with a connected neutral point. A hardware separator, based on HF transformers was developed to separate the noise into CM and line-DM noise. The CM and line-DM noise of the NPC inverter was measured, when operating the inverter with a two-level and a three-level modulation. As expected, the CM noise is dominating, and it is shown that the three-level operation reduces the noise compared to the two-level operation by about 3 to 6 dB.

[1]  Rik W. De Doncker,et al.  Experimental Validation of Design Concepts for Future EV-Traction Inverters , 2018, 2018 IEEE Transportation Electrification Conference and Expo (ITEC).

[2]  Rik W. De Doncker,et al.  Influence of the voltage-dependent output capacitance of SiC semiconductors on the electromagnetic interference in Dc-Dc converters for electric vehicles , 2017, 2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE.

[3]  Remus Teodorescu,et al.  Design, Control, and Application of Modular Multilevel Converters for HVDC Transmission Systems , 2016 .

[4]  Johann W. Kolar,et al.  Novel Three-Phase CM/DM Conducted Emission Separator , 2009, IEEE Transactions on Industrial Electronics.

[5]  Leon M. Tolbert,et al.  Multilevel inverters for electric vehicle applications , 1998, Power Electronics in Transportation (Cat. No.98TH8349).

[6]  A. Nagel,et al.  Separating Common Mode and Differential Mode Noise in EMI Measurement , 2000 .

[7]  J. Ferreira,et al.  Comparison and Reduction of Conducted EMI in SiC JFET and Si IGBT-Based Motor Drives , 2014, IEEE Transactions on Power Electronics.

[8]  Marcelo L. Heldwein,et al.  EMC filtering of three-phase PWM converters , 2008 .

[9]  Suleiman M. Sharkh,et al.  Analysis of dc-link capacitor current in three-level neutral point clamped and cascaded H-bridge inverters , 2013 .

[10]  Rik W. De Doncker,et al.  Active Neutral-Point Balancing of Three-Level Neutral-Point-Clamped Traction Inverters , 2018, 2018 21st International Conference on Electrical Machines and Systems (ICEMS).

[11]  Rik W. De Doncker,et al.  Optimized space vector modulation for DC-link balancing in three-level neutral-point-clamped inverters for electric drives , 2017, 2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS).

[12]  Anton Kersten,et al.  Efficiency of Active Three-Level and Five-Level NPC Inverters Compared to a Two-Level Inverter in a Vehicle , 2018, 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe).

[13]  Torbjorn Thiringer,et al.  Fault Detection and Localization for Limp Home Functionality of Three-Level NPC Inverters With Connected Neutral Point for Electric Vehicles , 2019, IEEE Transactions on Transportation Electrification.