A Paralleled Harmonic Suppression Path for VSG Current Control Loop

Virtual synchronous generator (VSG) technology is able to provide inertial support to the grid, but at the same time becomes the emerging source of harmonic currents. To address this problem, this paper proposes a harmonic current suppression method for VSG with parallel compensation of the current loop output. The parallel compensation branch is implemented using the harmonic phase compensation control branch proposed in this paper, which effectively improves the harmonic current suppression capability of the virtual synchronous generator. This method not only overcomes the problem of reduced suppression due to small line impedance, but also has a simpler structure and better harmonic current suppression than the existing methods. Finally, the effectiveness of the proposed improvement is verified by MATLAB simulations.