On the Mixed H2/H-infinity Loop Shaping Trade-offs in Fractional Order Control of the AVR System

Abstract

This paper looks at frequency domain design of a fractional order (FO) PID controller for an Automatic Voltage Regulator (AVR) system. Various performance criteria of the AVR system are formulated as system norms and is then coupled with an evolutionary multi-objective optimization (MOO) algorithm to yield Pareto optimal design trade-offs. The conflicting performance measures consist of the mixed H2/H-infinity designs for objectives like set-point tracking, load disturbance and noise rejection, controller effort and as such are an exhaustive study of various conflicting design objectives. A fuzzy logic based mechanism is used to identify the best compromise solution on the Pareto fronts. The advantages and disadvantages of using a FOPID controller over the conventional PID controller, which are popular for industrial use, are enunciated from the presented simulations. The relevance and impact of FO controller design from the perspective of the dynamics of AVR control loop is also discussed.

10 pages, 24 figures, 1 table, Accepted in IEEE Transactions on Industrial Informatics

References in corpus (4)

• On the Selection of Tuning Methodology of FOPID Controllers for the Control of Higher Order Processes
• Chaotic multi-objective optimization based design of fractional order PIλDμ controller in AVR system
• Frequency Domain Design of Fractional Order PID Controller for AVR System Using Chaotic Multi-objective Optimization
• Fractional Order Modeling of a PHWR Under Step-Back Condition and Control of Its Global Power with a Robust PIλDμ Controller

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• Multi-objective LQR with Optimum Weight Selection to Design FOPID Controllers for Delayed Fractional Order Processes
• Performance Analysis of Robust Stable PID Controllers Using Dominant Pole Placement for SOPTD Process Models