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Keywords

virtual synchronous generator; Lyapunov theorem; power frequency oscillation; multi-machine parallel system; RT-LAB

Abstract

The parallel operation of multiple virtual synchronous generators (VSGs) in large-scale renewable energy power stations may lead to the system's power frequency oscillation issues. To better coordinate multi-unit operation and enhance oscillation suppression, an oscillation suppression strategy optimizing transient inertia and damping is proposed. Firstly, based on a small-signal model, the oscillation mechanism and the impact of fixed parameters on stability are elucidated. Secondly, the system inertia centwe is introduced as a global coordination reference. Inertia and damping characteristics are optimized based on each VSG's frequency deviation from the inertia center and its rate of change. This accelerates transient energy decay, effectively minimizes frequency differences among VSGs under load disturbances, and significantly reduces system regulation time during the transient process while lowering impact power without compromising steady-state operation. Thirdly, the stability of the proposed strategy is demonstrated using Lyapunov's theorem. Finally, the effectiveness of the proposed strategy is validated through simulations in SIMULINK and on the RT-LAB hardware-in-the-loop platform. This research provides theoretical support and reference for the parallel operation of multiple VSGs within large-scale renewable energy power stations.

DOI

10.19781/j.issn.1673-9140.2025.06.007

First Page

67

Last Page

76

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