Title :
Robust controller design for a multilevel cascaded STATCOM
Author :
Jovcic, D. ; Sternberger, R.
Author_Institution :
Eng. Dept., Univ. of Aberdeen, Aberdeen
Abstract :
In this paper, the controller robustness is studied for an indirect controlled cascaded-type based multi-level Static Synchronous Compensator (STATCOM) with ´square wave control´. The MATLAB based small-signal analytical model is used to perform eigenvalue analysis and to design controllers. Two different advanced control techniques are investigated and compared against the conventional method of proportional- integral (PI) feedback voltage control. The first strategy includes an additional current feedback, which shows minimal benefit. The second strategy considers a phase-lead compensation and indicates significantly shorter eigenvalue branches and improved robustness. The final results are confirmed with detailed nonlinear PSCAD simulation.
Keywords :
control system analysis; control system synthesis; eigenvalues and eigenfunctions; robust control; static VAr compensators; MATLAB; current feedback; eigenvalue analysis; multilevel cascaded STATCOM; multilevel static synchronous compensator; phase-lead compensation; proportional- integral feedback voltage control; robust controller; square wave control; Analytical models; Automatic voltage control; Eigenvalues and eigenfunctions; Feedback; MATLAB; Performance analysis; Pi control; Proportional control; Robust control; Voltage control; Multilevel converter; STATCOM; controller studies; robustness studies; static VAR compensators;
Conference_Titel :
Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE
Conference_Location :
Pittsburgh, PA
Print_ISBN :
978-1-4244-1905-0
Electronic_ISBN :
1932-5517
DOI :
10.1109/PES.2008.4596689
