Open AccessImproved auto‐synchronisation of grid‐connected PV inverter based on the DC capacitor voltage control
Author(s) -
Musengimana Antoine,
Zheng Xuemei,
Li Haoyu
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.0516
Subject(s) - inverter , grid , capacitor , voltage , computer science , control theory (sociology) , photovoltaic system , electrical engineering , synchronization (alternating current) , control (management) , engineering , topology (electrical circuits) , mathematics , artificial intelligence , geometry
Based on inherent dynamics similarity between synchronous generator (SG) and DC capacitor power port, this study proposes an improved synchronisation control method of grid‐connected PV inverter based on DC capacitor voltage control where a DC‐link capacitor voltage is regulated to provide the synchronisation angle. The proposed control method uses the estimated grid angle feedforward to improve the damping performance of the system under disturbances. To assess the robustness of the proposed control method, a two‐step procedure is followed. Firstly, a reduced‐order model of the system was derived. Secondly, the performance and stability of the proposed control method were fully investigated through the eigenvalue analysis. The offline simulations and real‐time simulations are carried in PLECS software and PLECS RT Box, respectively in order to validate and demonstrate the effectiveness of the proposed control method. It has been found that the proposed control method yields a large band controller parameter setting while maintaining system stability. The results showed that the proposed method improved the operating capability and enhanced the performance of the system under disturbances and weak grid operation.