A new Kalman-Filter-based harmonic current suppression method for the virtual oscillator controlled grid-tied inverterA new Kalman-Filter-based harmonic current suppression method for the virtual oscillator controlled grid-tied inverter Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2023-12-042022enVirtual Oscillator Control (VOC) is an advanced nonlinear grid-forming controller used for power electronics interfaced distributed generation (DG). In order to improve the reliability of voltage source converter connecting to the disturbance grid, a feedback method with enhanced virtual impedance had been inserted into the control loop of the VOC-based inverter to suppress grid-injected harmonic currents. In this paper, a new grid-injected harmonic current suppression strategy with estimated voltage feedforward is proposed for a VOC-based voltage source inverter (VSI) connected to the distorted electrical grid. To achieve the control target, the Kalman-Filter is adopted to estimate the harmonic components of the grid voltage at the point of common coupling (PCC) and insert them to the feedforward control loop of the VOC-based inverter. Compared with the traditional VOC with enhanced virtual impedance method, the proposed control strategy has a slightly better ability to suppress the grid-injected harmonic current. A 3 kW/3-phase/120 V experimental prototype system designed on the DSPACE DS1202 platform has been developed to verify the effectiveness of the proposed control strategy.This work was supported in part by the Program “Bilateral and Multilateral Research and Technology Co-Operation Between Greece and China” under Grant 2017YFGH001164 and Grant eSOLAR/T7ΔKI-00066.http://creativecommons.org/licenses/by/4.0/IEEE Journal on Emerging and Selected Topics in Circuits and Systems121251-259 Luo Siyi Wu Weimin Koutroulis Eftychios Κουτρουλης Ευτυχιος Chung Henry Shu-Hung Blaabjerg, Frede, 1963- Institute of Electrical and Electronics Engineers Harmonic current suppression Impedance analysis Grid-tied inverter Virtual oscillator control