Using Kalman filter to achieve online estimation of equivalent grid impedance and high bandwidth control for LCL-filtered grid-tied invertersUsing Kalman filter to achieve online estimation of equivalent grid impedance and high bandwidth control for LCL-filtered grid-tied inverters Δημοσίευση σε Συνέδριο Conference Publication 2022-01-032020enThis project was funded by the Operational Program “Competitiveness, Entrepreneurship and Innovation 2014-2020” (co-funded by the European Regional Development Fund) and managed by the General Secretariat of Research and Technology, Ministry of Education, Research, and Religious Affairs under the project eSOLAR/T7ΔKI-00066.In 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.http://creativecommons.org/licenses/by/4.0/4247-4252The 46th Annual Conference of the IEEE Industrial Electronics Society Cheng Yanqi Wu Weimin Chung Henry Blaabjerg Frede Koutroulis Eftychios Κουτρουλης Ευτυχιος Zhu Lixun Institute of Electrical and Electronics Engineers Kalman filter Equivalent grid impedance Online estimation Fundamental component LCL-filter Grid-tied inverter