Open AccessEnhanced dq current control for single‐phase voltage‐source inverters
Author(s) -
Li Bingzhang,
Huang Shenghua,
Chen Xi,
Wan Shanming
Publication year - 2018
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.2017.0747
Subject(s) - decoupling (probability) , integrator , reference frame , control theory (sociology) , voltage source , signal (programming language) , current source , voltage , computer science , current (fluid) , transient (computer programming) , three phase , rotating reference frame , electronic engineering , frame (networking) , engineering , control (management) , control engineering , electrical engineering , physics , telecommunications , artificial intelligence , mechanics , programming language , operating system
Designing the dq ‐frame current regulator for single‐phase voltage‐source inverters is a very challenging task. Since only one real current signal exists in the circuit, an orthogonal signal generation (OSG) block is required to generate the virtual orthogonal signal. Thus, ac variables can be turned into equivalent dc quantities through an αβ / dq transformation. However, the OSG block makes the control system complex and introduces an extra transient disturbance. Consequently, the dynamic performance is deteriorated. In this study, the reference‐current‐based OSG method is analysed thoroughly. Based on this structure, the dq ‐axes decoupling control, which is widely discussed for three‐phase systems and usually neglected for single‐phase systems, is studied. Two decoupling techniques, i.e. the reference‐current feed‐forward control and the quasi‐complex vector proportional–integrator control, are implemented and analysed. The proposed theories and control schemes are evaluated by experimental results.