DocumentCode :
737603
Title :
Cascaded Current–Voltage Control to Improve the Power Quality for a Grid-Connected Inverter With a Local Load
Author :
Zhong, Qing-Chang ; Hornik, Tomas
Author_Institution :
Dept. of Autom. Control & Syst. Eng., Univ. of Sheffield, Sheffield, UK
Volume :
60
Issue :
4
fYear :
2013
fDate :
4/1/2013 12:00:00 AM
Firstpage :
1344
Lastpage :
1355
Abstract :
In this paper, a cascaded current-voltage control strategy is proposed for inverters to simultaneously improve the power quality of the inverter local load voltage and the current exchanged with the grid. It also enables seamless transfer of the operation mode from stand-alone to grid-connected or vice versa. The control scheme includes an inner voltage loop and an outer current loop, with both controllers designed using the H repetitive control strategy. This leads to a very low total harmonic distortion in both the inverter local load voltage and the current exchanged with the grid at the same time. The proposed control strategy can be used to single-phase inverters and three-phase four-wire inverters. It enables grid-connected inverters to inject balanced clean currents to the grid even when the local loads (if any) are unbalanced and/or nonlinear. Experiments under different scenarios, with comparisons made to the current repetitive controller replaced with a current proportional-resonant controller, are presented to demonstrate the excellent performance of the proposed strategy.
Keywords :
H control; control system synthesis; electric current control; harmonic distortion; invertors; load regulation; power grids; power supply quality; proportional control; voltage control; H repetitive control strategy; cascaded current-voltage control strategy; current exchange; current proportional-resonant controller; current repetitive controller design; grid-connected inverter local load voltage; inner voltage loop control; outer current loop control; power quality; single-phase inverter; three-phase four-wire inverter; total harmonic distortion; Bridge circuits; Inductors; Inverters; Power quality; Pulse width modulation; Synchronization; Voltage control; $H^{infty}$ control; microgrids; power quality; repetitive control; seamless transfer; total harmonic distortion (THD);
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2012.2187415
Filename :
6151132
Link To Document :
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