Offshore wind power grid-connected side active harmonic suppression system based on virtual harmonic impedance method

The invention discloses an offshore wind power grid-connected side active harmonic suppression system based on a virtual harmonic impedance method, and relates to the field of power grid harmonic suppression. At present, the cost for realizing harmonic suppression by additionally arranging an LC type passive filter device is high, and the occupied area is increased. According to the technical scheme, the active harmonic suppression system comprises an active harmonic suppression main circuit and an active harmonic suppression controller, wherein the active harmonic suppression main circuit comprises a medium-voltage full-bridge MMC converter and a full-bridge MMC converter boosting transformer; the active harmonic suppression controller calculates the reference value of each harmonic current of the active harmonic suppression main circuit on the offshore wind power grid-connected side, controls the output current of the active harmonic suppression system, and tracks the reference value, so that the active har