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Keywords

large-scale energy storage, virtual synchronous machine control, inertia increase, frequency stability

Abstract

The high proportion of power electronic equipment cannot provide enough inertia for the system, posing great challenges to the power system. The energy storage system controlled by the virtual synchronous generator (VSG) can participate in grid frequency adjustment and improve frequency stability. The influence of VSG control parameters on the stability and inertia support capability of a multi-node system with large-scale energy storage is analyzed, and the basis for configuring control parameters of large-scale energy storage under different system inertia levels is provided. Firstly, the principle and implementation of VSG control are introduced, and the state space model of the system is established. Secondly, the inertia response process of the synchronous motor is analyzed, and the energy required by VSG under frequency disturbance events and the corresponding virtual inertia time constant are derived. Then, a simulation model of a 3-machine 9-node system with VSG-controlled energy storage is established, and modal analysis is used to analyze the influence of control parameters on system stability. Finally, simulations are performed to verify the inertia support capability of energy storage and the effectiveness of energy storage parameter configuration principles.

DOI

10.19781/j.issn.1673-9140.2024.02.021

First Page

190

Last Page

197

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