Abstract
The Static Synchronous Compensator (STATCOM) provides shunt compensation in similar way to the Static VAR Compensator (SVC) but utilizes a voltage source converter rather than capacitors and reactor. In practice systems use simple Proportional-Integral (PI) controllers for control of STATCOM. However, since the PI control parameters were usually tuned based on classical or trial-and-error approaches, they were incapable of obtaining good dynamic performance for a wide range of operation conditions and various loads in power system. For this problem, in this research a robust control approach based on the Quantitative Feedback Theory (QFT) method was proposed for the design of STATCOM controllers (AC-voltage regulator and DC-voltage regulator) and also supplementary damping controller for increase of power system oscillations damping is developed. A Single-Machine Infinite-Bus (SMIB) power system installed with a STATCOM with system parametric uncertainties were considered for case study. The system parametric uncertainties were obtained by changing parameters and load by 45% simultaneously from their typical values. To show effectiveness of QFT method, the proposed method is compared with a conventional method (classical P-I controller optimized by Genetic Algorithm (GA)). Several linear and non-linear time-domain simulation tests visibly show the validity of proposed method in compare with traditional method.
Highlights
The Flexible AC Transmission Systems (FACTS) based on power electronics offer an opportunity to enhance controllability, stability and power transfer capability of AC transmission systems[1]
Most of the above methods have been applied in power systems and some of these efforts have contributed to the design of supplementary control for Static VAR Compensator (SVC) using mixed sensitivity[17], applying μ-synthesis for SVC in order to Corresponding Author: Seyed Abbas Taher, Department of Electrical Engineering, University of Kashan, km 6 Ravand Road, Kashan, Iran Tel: +98-9131614352 Fax +98-3615559930
The STATCOM is assumed to be based on Pulse Width Modulation (PWM) converters
Summary
The Flexible AC Transmission Systems (FACTS) based on power electronics offer an opportunity to enhance controllability, stability and power transfer capability of AC transmission systems[1]. The STATCOM is one of the important FACTS devices and can be used for dynamic compensation of power systems to provide voltage support and stability improvement[2,3,4,5,6,7,8,9,10]. Inaccuracy in plant may cause problems because the plant is part of the feedback loop To deal with such a problem, instead of using a single model plant, an uncertain model should be considered. This problem has led to the study of applying adaptive controllers for instance[14,15], nonlinear controllers for instance[16] in the power system stability control.
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