A virtual inertia calculation method for a virtual synchronous machine-based optical storage system

By constructing a virtual inertia calculation method for photovoltaic-storage systems, the problem of quantitative analysis of the inertia support effect of virtual synchronous machine systems was solved, and a unified characterization of frequency response under grid-connected and off-grid modes was achieved, improving the frequency stability of the power grid and the accuracy of power dispatch.

CN122136973APending Publication Date: 2026-06-02CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2026-03-10
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies lack quantitative analysis methods for the inertia support effect of virtual synchronous machine systems, making it difficult to conduct unified frequency response analysis in grid-connected and off-grid modes, resulting in insufficient grid frequency stability.

Method used

A method for calculating the virtual inertia of a photovoltaic-storage system based on a virtual synchronous machine is constructed. The power balance equation of the time-domain frequency response is established through per-unit processing. The system frequency response transfer function model under grid-connected and off-grid modes is derived, and the quantitative relationship between virtual inertia, damping coefficient and key frequency response indicators is revealed.

Benefits of technology

It enables precise analysis and parameter optimization of the frequency response characteristics of photovoltaic-storage systems under different modes, thereby improving the frequency stability of the power grid and the accuracy of power dispatch.

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Abstract

This invention discloses a method for calculating the virtual inertia of a photovoltaic-storage system based on a virtual synchronous machine, belonging to the field of new energy power generation technology. Addressing the complex frequency response characteristics of photovoltaic-storage systems based on virtual synchronous machines, this invention first constructs per-unit power balance equations for both grid-connected and off-grid modes. Based on this, it constructs frequency response transfer function models for both grid-connected and off-grid modes. Then, it derives analytical expressions for system frequency changes and calculates key frequency response indicators. This invention can quantitatively reveal the virtual inertia J. vsg and virtual damping coefficient D vsg The quantitative relationship between control parameters and these key performance indicators helps guide the optimal design of VSG controller parameters and the precise and rational scheduling of power in photovoltaic energy storage systems.
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