A dynamic decoupling control method based on adaptive virtual synchronous impedance

By constructing a wide-frequency-domain dynamic model and adaptive virtual synchronous impedance decoupling control, the power coupling problem of the virtual synchronous generator under weak power grid and high line impedance ratio conditions is solved, thereby improving the system's stability and dynamic response performance.

CN116388224BActive Publication Date: 2026-06-19NORTH CHINA ELECTRIC POWER UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV
Filing Date
2023-04-11
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing virtual synchronous generator technology suffers from severe power coupling under conditions of weak power grids and high line impedance ratios, resulting in large system oscillation amplitudes, long settling times, deterioration of power control performance, and even system instability.

Method used

A dynamic decoupling control method based on adaptive virtual synchronous impedance is adopted. By constructing a wide-frequency dynamic model, the nonlinear system is linearized. The power coupling is eliminated and the system stability is improved by using the diagonal array decoupling method and adaptive virtual impedance decoupling.

Benefits of technology

It effectively eliminates power coupling, improves the dynamic response performance and stability of the system, and enhances the control effect of the virtual synchronous machine grid-connected system.

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Abstract

This invention discloses a dynamic decoupling control method based on adaptive virtual synchronous impedance, belonging to the field of virtual synchronous machine technology. The method includes: constructing an equivalent circuit for VSG grid connection; calculating a single-machine wideband dynamic small-signal model of the virtual synchronous machine considering the system's dynamic process after adding virtual impedance; comprehensively considering the influence of large power angle and high line impedance ratio on the coupling characteristics of VSG under weak grid conditions, adopting an adaptive virtual synchronous impedance decoupling strategy based on the dynamic model, and solving the wideband dynamic small-signal model with virtual resistance and virtual inductance as adjustment variables; using a diagonal array decoupling method, eliminating power coupling in the system's dynamic process after VSG disturbance through adaptive adjustment of virtual impedance, calculating the virtual impedance command value and sending it to the virtual impedance loop for control; comparing and analyzing the system's stability and dynamic response performance before and after decoupling control, verifying that this method can improve the system's dynamic response performance and enhance the stability of the VSG grid-connected system.
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