Open AccessImproved control strategy for the three‐phase grid‐connected inverter
Author(s) -
Yao Zhilei,
Xiao Lan,
Guerrero Josep M.
Publication year - 2015
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2014.0350
Subject(s) - inverter , harmonics , grid , control theory (sociology) , waveform , ripple , computer science , pulse width modulation , controller (irrigation) , voltage , electronic engineering , electrical engineering , engineering , control (management) , mathematics , geometry , artificial intelligence , agronomy , biology
An improved control strategy for the three‐phase grid‐connected inverter with space vector pulse‐width modulation (SVPWM) is proposed. When the grid current contains harmonics, the d ‐ and q ‐axis grid currents will be interacted, and then the waveform quality of the grid current will be poorer. As the reference output voltage cannot directly reflect the change of the reference grid current, the dynamic response of the grid‐connected inverter is slow. In order to solve the aforementioned problems, the d ‐ and q ‐axis grid currents in the decoupled components of the grid current controller can be substituted by the d ‐ and q ‐axis reference grid currents, respectively. The operating principles of the traditional and proposed control methods are illustrated. Experimental results for a 15‐kVA three‐phase grid‐connected inverter with SVPWM verify the theoretical analysis. Compared with the traditional control strategy, the grid‐connected inverter with the improved control strategy has a high waveform quality of the grid current, small ripple power and fast dynamic response.