## An online measurement method for common-mode impedance in three-phase grid-connected converters

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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**An online measurement method for common-mode impedance in three-phase grid-connected converters.** / Messo, Tuomas; Suntio, Teuvo; Viinamäki, Jukka; Roinila, Tomi.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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*8th Annual IEEE Energy Conversion Congress & Exposition (ECCE 2016).*IEEE, IEEE Energy Conversion Congress and Exposition, 1/01/00. https://doi.org/10.1109/ECCE.2016.7854860

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*8th Annual IEEE Energy Conversion Congress & Exposition (ECCE 2016)*IEEE. https://doi.org/10.1109/ECCE.2016.7854860

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TY - GEN

T1 - An online measurement method for common-mode impedance in three-phase grid-connected converters

AU - Messo, Tuomas

AU - Suntio, Teuvo

AU - Viinamäki, Jukka

AU - Roinila, Tomi

PY - 2016

Y1 - 2016

N2 - Three-phase converters are common in modern power systems in interfacing of renewable sources and for improving power quality. A three-phase converter, whether operating as an inverter or active front-end, produces a varying common-mode voltage when conventional sinusoidal PWM is used. Frequency components of the common-mode voltage are located at the switching frequency which ranges usually from few kilohertz to tens of kilohertz and its multiples. The high-frequency AC component produces common-mode current which depends on the magnitude of common-mode impedance seen by the power converter. The common-mode current is usually mitigated by using common-mode chokes, complex passive filter topologies or active methods. The design of these filters is not straight-forward since the common-mode impedance is often unknown and may exhibit resonances. Therefore, an accurate method for measuring common-mode impedance is needed to enable deterministic filter design. Moreover, the common-mode impedance should be measured online, i.e., in the normal operating environment of the converter. In this paper an online method for measuring the common-mode impedance is proposed. The method can be implemented by using a converter which is able to achieve high switching frequency, such as an inverter based on SiC-switches.

AB - Three-phase converters are common in modern power systems in interfacing of renewable sources and for improving power quality. A three-phase converter, whether operating as an inverter or active front-end, produces a varying common-mode voltage when conventional sinusoidal PWM is used. Frequency components of the common-mode voltage are located at the switching frequency which ranges usually from few kilohertz to tens of kilohertz and its multiples. The high-frequency AC component produces common-mode current which depends on the magnitude of common-mode impedance seen by the power converter. The common-mode current is usually mitigated by using common-mode chokes, complex passive filter topologies or active methods. The design of these filters is not straight-forward since the common-mode impedance is often unknown and may exhibit resonances. Therefore, an accurate method for measuring common-mode impedance is needed to enable deterministic filter design. Moreover, the common-mode impedance should be measured online, i.e., in the normal operating environment of the converter. In this paper an online method for measuring the common-mode impedance is proposed. The method can be implemented by using a converter which is able to achieve high switching frequency, such as an inverter based on SiC-switches.

U2 - 10.1109/ECCE.2016.7854860

DO - 10.1109/ECCE.2016.7854860

M3 - Conference contribution

BT - 8th Annual IEEE Energy Conversion Congress & Exposition (ECCE 2016)

PB - IEEE

ER -