Stability Considerations of Voltage-Sense Current-Cancellation Active Common-Mode Filters in DC Grids

Hoffmann M, Schwanninger R, März M (2026)

Publication Language: English

Publication Type: Journal article

Publication year: 2026

Journal

IEEE Transactions on Power Electronics Institute of Electrical and Electronics Engineers (IEEE)

DOI: 10.1109/TPEL.2026.3675349

Abstract

This paper presents a compact, measurementcalibrated framework to model and certify stability of voltagesense current-cancellation active common-mode filters for directcurrent grids. We develop a closed-loop description that includes a non-ideal operational amplifier with finite output resistance, a frequency-dependent line impedance stabilization network, and sensing and injection paths. The formulation unifies transfer function and one-port admittance views, so that stability can be judged at a single interconnection port. The proposed analytical model enables a detailed characterization of the system's dynamic behavior, allowing for targeted stability-oriented tuning prior to physical prototyping. We validate the model against hardware measurements from 100 Hz to 10 MHz using two network analyzers, observing close agreement. While pole-zero inspection can be employed for full system knowledge, typical methods for stability estimation with partial system knowledge are too conservative or inconclusive for this topology. Consequently, we employ an admittance-based Nyquist test on the measured total admittance as a necessary and sufficient bench procedure that certifies stability without a detailed analytical model and directly guides impedance shaping. The result is a traceable one-port measurement-based assessment that shortens design cycles and reduces the risk of electromagnetic-interference compliance in compact DC power systems.

Authors with CRIS profile

Madlen Hoffmann Lehrstuhl für Leistungselektronik (LEE) Raffael Schwanninger Lehrstuhl für Leistungselektronik (LEE) Martin März Lehrstuhl für Leistungselektronik (LEE)

How to cite

APA:

Hoffmann, M., Schwanninger, R., & März, M. (2026). Stability Considerations of Voltage-Sense Current-Cancellation Active Common-Mode Filters in DC Grids. IEEE Transactions on Power Electronics. https://doi.org/10.1109/TPEL.2026.3675349

MLA:

Hoffmann, Madlen, Raffael Schwanninger, and Martin März. "Stability Considerations of Voltage-Sense Current-Cancellation Active Common-Mode Filters in DC Grids." IEEE Transactions on Power Electronics (2026).

BibTeX: Download