Open AccessBackstepping direct power control without phase‐locked loop of AC/DC converter under both balanced and unbalanced grid conditions
Author(s) -
Sun Dan,
Wang Xiaohe,
Fang Yang
Publication year - 2016
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.2015.0653
Subject(s) - backstepping , control theory (sociology) , grid , controller (irrigation) , computer science , compensation (psychology) , power (physics) , power control , three phase , reference frame , control (management) , frame (networking) , engineering , mathematics , electrical engineering , voltage , telecommunications , adaptive control , physics , psychology , geometry , quantum mechanics , artificial intelligence , psychoanalysis , agronomy , biology
This study presents a backstepping direct power control (BS‐DPC) strategy for the grid‐connected AC/DC converter under both balanced and unbalanced grid conditions. The proposed BS‐DPC adopts the non‐linear BS controller to the DPC strategy in the stationary reference frame, thus phase‐locked loop is unnecessary. A generalised power compensation method is applied to the proposed BS‐DPC under unbalanced grid condition to achieve multiple control targets. To validate the effectiveness of the proposed BS‐DPC, comparative experimental studies are conducted under both balanced and unbalanced grid conditions. Experimental results verify that the proposed BS‐DPC inherits the excellent dynamic performance of the traditional DPC and has excellent steady‐state performance as well. In addition, flexible control targets can be achieved and dynamically adjusted under unbalanced grid condition according to the grid safety operation requirement.