Improved fractional-order virtual synchronous machine grid-connected control method

By using an improved fractional-order virtual synchronous machine grid-connected control method, the dynamic oscillation and overshoot problems of the virtual synchronous machine under active power reference commands and grid frequency disturbances are solved, achieving higher control freedom and faster response speed, and improving the flexibility of parameter adjustment.

CN122118731APending Publication Date: 2026-05-29GUILIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUILIN UNIVERSITY OF TECHNOLOGY
Filing Date
2026-01-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing virtual synchronous machine grid-connected control technology suffers from dynamic oscillation and overshoot problems under active power reference commands and grid frequency disturbances, lacks sufficient control freedom and parameter flexibility, and has a slow response speed.

Method used

An improved fractional-order virtual synchronous machine grid-connected control method is adopted. By adding a fractional-order integral correction stage and a forward proportional correction stage, fractional-order integral parameters and forward proportional correction parameters are introduced to form an improved fractional-order virtual synchronous machine, thereby achieving higher control freedom and flexible parameter adjustment.

Benefits of technology

It effectively suppresses the dynamic oscillation and overshoot of the virtual synchronous machine grid-connected system, improves the dynamic response speed of grid-connected active power, shortens the output frequency adjustment time, and enhances the flexibility of control parameter selection.

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Abstract

The application discloses an improved fractional order virtual synchronous machine grid-connected control method, which improves the rotor motion equation of the virtual synchronous machine, that is, an improved fractional order virtual synchronous machine is formed by additionally adding a fractional order integral correction link, an active power feedforward compensation link and a forward channel proportional correction link, and two control degrees of freedom, namely a fractional order integral parameter and a forward channel proportional correction parameter, are introduced, so that the dynamic oscillation and overshoot of active power and output frequency of the virtual synchronous machine grid-connected system caused by active power reference instruction change or power grid frequency disturbance can be effectively inhibited by flexibly adjusting the two introduced control degrees of freedom, the control degrees of freedom are higher, the parameter adjustment is more flexible, the active power dynamic response speed of grid connection can be improved, and the output frequency adjustment time can be shortened, and the improved fractional order virtual synchronous machine grid-connected control method is suitable for the field of virtual synchronous machine grid-connected control in power electronic technology.
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