DocumentCode :
88745
Title :
Predictive Direct Power Control for Three-Phase Grid-Connected Converters Without Sector Information and Voltage Vector Selection
Author :
Zhanfeng Song ; Wei Chen ; Changliang Xia
Author_Institution :
Sch. of Electr. Eng. & Autom., Tianjin Univ., Tianjin, China
Volume :
29
Issue :
10
fYear :
2014
fDate :
Oct. 2014
Firstpage :
5518
Lastpage :
5531
Abstract :
In this paper, a predictive direct power control (DPC) method without sector information and voltage vector selection is proposed for three-phase grid-connected converters. Different from conventional predictive direct power controllers, the proposed strategy always adopts fixed voltage vectors, instead of selecting voltage vectors according to the angular information of the grid-voltage vector or the virtual-flux vector. The converter switching time is obtained by minimizing the squared errors of the instantaneous active and reactive power. Switch duty cycles are then calculated and equivalently reconstructed. The proposed strategy not only presents rapid dynamic response due to the use of the predictive controller, but also possesses excellent steady-state performance as a result of duty cycle reconstruction. The main advantage of the proposed control scheme, compared with the classical DPC strategies, is that it is unnecessary to use sector information of the grid-voltage vector, and selection of active voltage vectors is also not required here. Therefore, incorrect selection of voltage vectors and the resulting performance deterioration are surely avoided, without the need of any additional compensation measures. An in-depth comparison and experimental assessment are given to validate the effectiveness of the proposed strategy.
Keywords :
power control; predictive control; switching convertors; DPC method; active voltage vectors; converter switching time; duty cycle reconstruction; fixed voltage vectors; grid-voltage vector; predictive direct power control; three-phase grid-connected converters; Cost function; Minimization; Power control; Reactive power; Switches; Vectors; Voltage control; Cost function minimization; duty cycle reconstruction; predictive direct power control (P-DPC); three-phase converter; voltage vector selection;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2013.2289982
Filename :
6658960
Link To Document :
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