DocumentCode :
1551480
Title :
Secondary Control for Voltage Quality Enhancement in Microgrids
Author :
Savaghebi, Mehdi ; Jalilian, Alireza ; Vasquez, Juan C. ; Guerrero, Josep M.
Author_Institution :
Electr. Eng. Dept., Iran Univ. of Sci. & Technol., Tehran, Iran
Volume :
3
Issue :
4
fYear :
2012
Firstpage :
1893
Lastpage :
1902
Abstract :
In this paper, a hierarchical control scheme is proposed for enhancement of sensitive load bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises distributed generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental and harmonic components of load current among the DG units. The sharing improvement is provided at the expense of increasing voltage unbalance and harmonic distortion. Thus, the secondary control level is applied to manage the compensation of SLB voltage unbalance and harmonics by sending proper control signals to the primary level. DGs compensation efforts are controlled locally at the primary level. The system design procedure for selecting proper control parameters is discussed. Simulation results are provided in order to demonstrate the effectiveness of the proposed control scheme.
Keywords :
distortion; distributed power generation; power supply quality; voltage control; compensation efforts; control parameters; distributed generators; harmonic components; harmonic distortion; hierarchical control scheme; local controllers; microgrids; secondary control; sensitive load bus; voltage quality enhancement; voltage unbalance; Control systems; Harmonic analysis; Harmonic distortion; Impedance; Power system harmonics; Voltage control; Voltage measurement; Distributed generator (DG); microgrid; voltage harmonics; voltage unbalance;
fLanguage :
English
Journal_Title :
Smart Grid, IEEE Transactions on
Publisher :
ieee
ISSN :
1949-3053
Type :
jour
DOI :
10.1109/TSG.2012.2205281
Filename :
6230624
Link To Document :
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