Open AccessHigh performance current control of single‐phase grid‐connected converter with harmonic mitigation, power extraction and frequency adaptation capabilities
Author(s) -
Somkun Sakda
Publication year - 2021
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/pel2.12038
Subject(s) - reference frame , total harmonic distortion , control theory (sociology) , rotating reference frame , ac power , harmonic , converters , controller (irrigation) , computer science , harmonics , automatic frequency control , grid , power control , frequency grid , electronic engineering , voltage , engineering , frame (networking) , power (physics) , electrical engineering , control (management) , physics , telecommunications , mathematics , agronomy , geometry , artificial intelligence , quantum mechanics , mechanics , biology
Grid‐connected converters in distributed generation systems are required to operate under highly distorted voltage with a wide frequency range, and to provide active/reactive power information for ancillary services and power control. This paper presents multiple unbalanced synchronous reference frame control for regulating and mitigating the grid current distortion of a voltage source converter caused by grid voltage distortion and converter deadtime. The proposed control technique has intrinsic power extraction and frequency adaptation capabilities. The multiple unbalanced synchronous reference frame control is compared with the proportional multi‐resonant control. A new controller which combines the unbalanced synchronous reference frame control for regulation of the fundamental component current and the multi‐resonant control for harmonic compensation is presented. The proposed control techniques were verified with a 1.5‐kVA LCL‐filtered grid connected inverter. The multiple unbalanced synchronous reference frame control with odd harmonic orders 3rd to 13th exhibited excellent harmonic rejection with a total harmonic distortion (THD) less than 0.60% under a highly distorted voltage. The proposed combined control technique provided slightly inferior performance with the grid current THD less than 0.65%. The combined control scheme retains functionalities as the multiple unbalanced synchronous reference frame control with a significant reduction of computational effort.