Virtual synchronous generator-based pre-synchronization control method for network-forming converter

By employing a pre-synchronization control method without a phase-locked loop, and calculating the phase difference compensation coefficient based on the positive sequence voltage component and adjusting the adaptive PI parameters, the grid connection stability problem of the virtual synchronous generator in a weak grid environment is solved, achieving a fast and stable synchronization process.

CN121440754APending Publication Date: 2026-01-30YIZHENG POWER SUPPLY OF JIANGSU ELECTRIC POWER +1
0 Cites 1 Cited by

Patent Information

Application Number
CN202511987594.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-01-30

AI Technical Summary

Technical Problem

Traditional virtual synchronous generator pre-synchronization control methods suffer from poor phase-locked loop stability, high system complexity, and low robustness in weak grid environments, leading to grid-connected inrush current and frequency instability.

Method used

A pre-synchronization control method without phase-locked loop is adopted. The positive sequence component of voltage is extracted by Clark transformation, the phase difference compensation coefficient is calculated, the PI parameters are adaptively tuned, and the internal potential amplitude is adjusted to achieve synchronization.

Benefits of technology

Shorten the pre-synchronization time, reduce grid connection inrush current, and improve the grid connection success rate and system stability of microgrids in weak grid scenarios.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a pre-synchronization control method for a network-building converter based on a virtual synchronous generator, and the method comprises the steps: collecting the three-phase voltage of the output end of the virtual synchronous generator VSG and the three-phase voltage of a power grid side, converting the three-phase voltage into a voltage component in a two-phase static coordinate system through Clark conversion, and extracting a positive-sequence component; calculating a phase difference compensation coefficient based on the positive sequence component; based on the phase difference compensation coefficient, adaptively setting a PI parameter; and calculating and adjusting the amplitude of the internal potential to finish pre-synchronization. In the working process, through self-adaptive PI parameter setting and amplitude accurate judgment, the pre-synchronization time is shortened, the grid-connected impact current is reduced, and the grid-connected success rate of the micro-grid in a weak grid scene is improved.
Need to check novelty before this filing date? Find Prior Art