Open AccessA Novel Pre-Synchronization Control for Grid Connection of Virtual Synchronous Generator
Author(s) -
Xuhai Chen,
Yiwang Zhang,
Jin Dong,
Xingkui Mao,
Jiaqiao Chen,
Wen Bu-yin,
Zhe Zhang
Publication year - 2020
Publication title -
elektronika ir elektrotechnika
Language(s) - English
Resource type - Journals
eISSN - 2029-5731
pISSN - 1392-1215
DOI - 10.5755/j01.eie.26.6.25874
Subject(s) - voltage droop , control theory (sociology) , controller (irrigation) , synchronization (alternating current) , grid , phase locked loop , engineering , automatic frequency control , moment of inertia , frequency grid , grid connection , permanent magnet synchronous generator , computer science , voltage , control (management) , electronic engineering , voltage source , topology (electrical circuits) , electrical engineering , mathematics , jitter , agronomy , physics , geometry , quantum mechanics , artificial intelligence , biology
The virtual synchronous generator (VSG) introduces rotational inertia and damping through the droop control to take part in frequency regulation of the grid. By building the VSG model, the VSG controller, including both the frequency controller and the excitation controller, are analysed and designed. The analysis shows that the large phase difference Δθ between the VSG voltage and the grid voltage at the grid-tied moment may produce large power and damage the VSG. The proposed pre-synchronization control minimizes the phase difference, which is implemented by replacing Δθ with sinΔθ to avoid any step change from Δθ. The proposed method is able to simplify control, shorten pre-synchronization tracking time, and achieve high accuracy without a phase-lock loop. The built 12 kW VSG simulation and prototype verify the theoretical analysis, the proposed control and its associated design.