Digital notch filter based active damping for LCL filters

Wenli Yao, Yongheng Yang, Xiaobin Zhang, Frede Blaabjerg

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24 Citationer (Scopus)
785 Downloads (Pure)

Abstrakt

LCL filters are widely used in Pulse Width Modulation (PWM) inverters. However, it also introduces a pair of unstable resonant poles that may challenge the controller stability. The passive damping is a convenient possibility to tackle the resonance problem at the cost of system overall efficiency. In contrast, the active damping does not require any dissipation elements, and thus has become of increasing interest. As a result, a vast of active damping solutions have been reported, among which multi-loop control systems and additional sensors are necessary, leading to increased cost and complexity. In this paper, a notch filter based active damping without the requirement of additional sensors is proposed, where the inverter current is employed as the feedback variable. Firstly, a design method of the notch filter for active damping is presented. The entire system stability has then been investigated, which has revealed that negative variations of the resonant frequency can seriously affect the system stability. In order to make the controller more robust against grid impedance variations, the notch filter frequency is thus designed smaller than the LCL filter resonant frequency, which is done in the z-domain. Simulations and experiments are carried out to verify the proposed active damping method. Both results have confirmed that the notch filter based active damping can ensure the entire system stability in the case of resonances with a good system performance.
OriginalsprogEngelsk
TitelProceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)
Antal sider8
ForlagIEEE Press
Publikationsdatomar. 2015
Sider2399-2406
ISBN (Trykt)978-1-4799-6735-3
DOI
StatusUdgivet - mar. 2015
Begivenhed30th Annual IEEE Applied Power Electronics Conference and Exposition - Charlotte, USA
Varighed: 15 mar. 201519 mar. 2015

Konference

Konference30th Annual IEEE Applied Power Electronics Conference and Exposition
LandUSA
ByCharlotte
Periode15/03/201519/03/2015
NavnI E E E Applied Power Electronics Conference and Exposition. Conference Proceedings
ISSN1048-2334

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  • Projekter

    HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems

    Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.

    European Research Counsil

    01/02/201328/02/2018

    Projekter: ProjektForskning

  • Citationsformater

    Yao, W., Yang, Y., Zhang, X., & Blaabjerg, F. (2015). Digital notch filter based active damping for LCL filters. I Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC) (s. 2399-2406). IEEE Press. I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings https://doi.org/10.1109/APEC.2015.7104684