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access icon free Modified virtual inertia control method of VSG strategy with improved transient response and power-supporting capability

© The Institution of Engineering and Technology
Received 21/01/2019, Accepted 17/07/2019, Revised 25/06/2019, Published 24/07/2019

Virtual synchronous generator (VSG) controlled grid-tied converters could increase power overshoot and oscillation if real power reference disturbance (PRD) occurs. Existing VSG methods can mitigate the power oscillations, but they may reduce the supporting capability of grid contingency. To cope with the issue, a modified virtual inertia control method of VSG strategy is proposed. The proposed modified VSG method introduces two frequencies of point of common coupling into the virtual inertia control. The estimated frequency is used to mitigate the power oscillations and the measured frequency aims to provide extra power supporting. The formulated parameters design principles are given according to the transient characteristics. Stability analysis of power and frequency response is carried out to evaluate the proposed method. Besides, the transient power and frequency response of the PRD case and grid-frequency disturbance (GFD) case are studied. The power overshoot of the proposed modified VSG method decreases by 52.5% under the PRD case and the power support peak increases by 34.3% under the GFD case. Experimental results show that the transient performance of the proposed modified VSG controlled grid-tied converters is improved.

Inspec keywords: distributed power generation; transient response; frequency response; power generation control; synchronous generators; power grids

Other keywords: modified virtual inertia control method; power overshoot; estimated frequency; modified VSG method; power reference disturbance; improved transient response; frequency response; PRD case; grid-frequency disturbance case; power-supporting capability; transient power; extra power supporting; VSG strategy; VSG methods; modified VSG controlled grid-tied converters; measured frequency aims; virtual synchronous generator controlled grid-tied converters; power oscillations; power support peak increases

Subjects: Control of electric power systems; Distributed power generation; Synchronous machines

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