An active damper to suppress multiple resonances with unknown frequencies

The increasing use of power electronics devices tends to aggravate high-frequency harmonics and trigger resonances across a wide frequency range into power systems. This paper presents an active damper to suppress multiple resonances with unknown frequencies. The active damper is realized by a high-bandwidth power converter that can selectively dampen out the wideband resonances. A cascaded adaptive notch filter structure is proposed to detect the frequencies of resonances, which makes the active damper different from the resistive-active power filter for harmonic resonance suppression. The performance of the active damper is validated by implementing it to suppress the resonances in a grid-connected inverter with a long power cable. The results show that the active damper can become a promising approach to stabilizing the future power electronics based power systems.

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Wang, X., Blaabjerg, F., Liserre, M., 2014. An active damper to suppress multiple resonances with unknown frequencies, in: 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014. IEEE, New York, NY. https://doi.org/10.1109/APEC.2014.6803608
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