Open AccessIntegrated design method for LCL‐type filter and current controller to improve inverter adaptability to grid impedance
Author(s) -
Zheng Chen,
Liu Yajuan,
Li Qionglin,
Liu Shuming,
Zhang Bo,
Wang Yi,
Mao Mingxuan
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.0358
Subject(s) - adaptability , inverter , electrical impedance , controller (irrigation) , grid , current (fluid) , computer science , filter (signal processing) , electronic engineering , control theory (sociology) , control engineering , engineering , electrical engineering , control (management) , mathematics , voltage , artificial intelligence , ecology , geometry , biology , agronomy
To characterise the grid‐connected inverter with strong robustness against grid impedance, this study proposes an integrated design approach of LCL‐type filter and controller parameters. In the approach, the inherent relation between LCL‐type filter and controller in regarding to inverter robustness is revealed and utilised to realise the optimised match between LCL‐type‐filter parameters and controller parameters. To facilitate the analysis of stability and robustness, a parameter normalisation scheme is also proposed. With the scheme, relevant normalisation parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL‐type parameter and controller parameter can be achieved immediately by restoring normalisation parameters. Based on the approach parameter constraints and design guidelines for robust grid‐connected inverter design are also derived in the study to facilitate its application in practice. The proposed inverter design method can guarantee the inverter stability and robustness simultaneously without needing the complicated iterative computations, which cannot be avoided for conventional design methods. Simulation and experimental results are presented to validate the performance and demonstrate the merits of the integrated design method.