Abstract
Virtual synchronous generator technology (VSG), which simulates the electro-mechanical transient characteristics of synchronous generators, enables the power supply or load that adopt a converter with a number of its external characteristics, including inertia, damping, frequency and voltage regulation. However, when the grid voltage is not ideal, the traditional VSG control will lead to unbalanced three-phase grid-connected current, so a control method of specific sub-voltage component feed-forward is proposed. First of all, the problems of VSG in non-ideal grid voltage are analysed. Based on this, the harmonic components are extracted by sinusoidal amplitude integral method, and the control strategy of specific voltage component feed-forward is proposed, which can suppress the grid voltage’s negative sequence components and harmonic components. Simulation and experimental results show that the proposed control strategy is correct and effective.
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