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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.
Inspec keywords: feedforward; power convertors; voltage control; synchronous generators; power grids
Subjects: Power convertors and power supplies to apparatus; Control of electric power systems; Synchronous machines; Voltage control