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Using Kalman filter to achieve online estimation of equivalent grid impedance and high bandwidth control for LCL-filtered grid-tied inverters

Cheng Yanqi, Wu Weimin, Chung Henry, Blaabjerg Frede, Koutroulis Eftychios, Zhu Lixun

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URIhttp://purl.tuc.gr/dl/dias/138A4B41-9DB0-411B-832D-1BB7310F36A6-
Αναγνωριστικόhttps://doi.org/10.1109/IECON43393.2020.9254598-
Αναγνωριστικόhttps://ieeexplore.ieee.org/document/9254598-
Γλώσσαen-
Μέγεθος6 pagesen
ΤίτλοςUsing Kalman filter to achieve online estimation of equivalent grid impedance and high bandwidth control for LCL-filtered grid-tied invertersen
ΔημιουργόςCheng Yanqien
ΔημιουργόςWu Weiminen
ΔημιουργόςChung Henryen
ΔημιουργόςBlaabjerg Fredeen
ΔημιουργόςKoutroulis Eftychiosen
ΔημιουργόςΚουτρουλης Ευτυχιοςel
ΔημιουργόςZhu Lixunen
ΕκδότηςInstitute of Electrical and Electronics Engineersen
ΠερίληψηIn grid-tied DC/AC inverter applications, the equivalent grid impedance often varies widely, which may limit the bandwidth of the inverter control system. This paper introduces a new method to perform the online estimation of the equivalent grid impedance with a Kalman filter by observing the grid voltage and grid current, as well as the voltage at the point of common coupling (PCC). With the estimated grid impedance, a high control bandwidth can be achieved for the grid-tied inverter through online regulation of the proportional coefficient of a current controller. A MATLAB/Simulink model of a grid-tied single-phase inverter has been setup to demonstrate the effectiveness of the proposed method. The simulation results show that the online estimated impedance is accurate enough and the inverter system can continuously maintain a high bandwidth, even under weak grid operating conditions.en
ΤύποςΔημοσίευση σε Συνέδριοel
ΤύποςConference Publicationen
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2022-01-03-
Ημερομηνία Δημοσίευσης2020-
Θεματική ΚατηγορίαKalman filteren
Θεματική ΚατηγορίαEquivalent grid impedanceen
Θεματική ΚατηγορίαOnline estimationen
Θεματική ΚατηγορίαFundamental componenten
Θεματική ΚατηγορίαLCL-filteren
Θεματική ΚατηγορίαGrid-tied inverteren
Βιβλιογραφική ΑναφοράY. Cheng, W. Wu, H. Chung, F. Blaabjerg, E. Koutroulis and L. Zhu, "Using Kalman filter to achieve online estimation of equivalent grid impedance and high bandwidth control for LCL-filtered grid-tied inverters," in IECON 2020, pp. 4247-4252. doi: 10.1109/IECON43393.2020.9254598.en

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