Active Damping of LCL Filters with All-Pass Filters Considering Grid Impedance Variations and Parameter Drifts

Wenli Yao, Yongheng Yang, Yan Xu, Frede Blaabjerg, Shuyong Liu, Gary Wilson

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

3 Citationer (Scopus)

Abstrakt

Active damping is a common way to stabilize the current control of LCL-filtered inverter systems. In this paper, the active damping is realized with digital filters to reshape the open-loop phase response, where no additional sensors are required. A safety region of −180°-phase crossing is first identified within a predefined range of grid impedance changes and LCL parameter variations. Once the phase of the current control loop is reshaped to the safety region, a stable control loop can be ensured. Different digital filters are selected for comparison, which shows that the allpass filter has a unit gain and adjustable phase-lag capability, being a promising solution for phase reshaping. Therefore, the allpass filter is employed to move the −180°-phase crossing into the targeted safety region. By doing so, the all-pass filter-based active damping can be separated from the current controller design, without retuning the PI parameters. Simulations are performed and the results verify that the proposed method can ensure the system stability, while maintaining fast dynamics.
OriginalsprogEngelsk
TitelProceedings of the IEEE Energy Conversion Congress and Exposition (ECCE 2018)
Antal sider7
Udgivelses stedUSA
ForlagIEEE Press
Publikationsdatosep. 2018
Sider4915 - 4921
ISBN (Trykt)978-1-4799-7313-2
ISBN (Elektronisk)978-1-4799-7312-5
DOI
StatusUdgivet - sep. 2018
BegivenhedIEEE Energy Conversion Congress & Exposition ECCE 2018 - Portland, USA
Varighed: 23 sep. 201827 sep. 2018
http://www.ieee-ecce.org/2018/

Konference

KonferenceIEEE Energy Conversion Congress & Exposition ECCE 2018
LandUSA
ByPortland
Periode23/09/201827/09/2018
Internetadresse
NavnIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

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  • Citationsformater

    Yao, W., Yang, Y., Xu, Y., Blaabjerg, F., Liu, S., & Wilson, G. (2018). Active Damping of LCL Filters with All-Pass Filters Considering Grid Impedance Variations and Parameter Drifts. I Proceedings of the IEEE Energy Conversion Congress and Exposition (ECCE 2018) (s. 4915 - 4921). IEEE Press. IEEE Energy Conversion Congress and Exposition https://doi.org/10.1109/ECCE.2018.8558420