Design of a PID Controller with Fractional Order Derivative Filter for Automatic Voltage Regulation in Power Systems

In this study, a PID controller with fractional order derivative filter (PIDFF) is designed for automatic voltage regulation (AVR) in power systems. In order to ensure maximum transient and steady state performance from the designed controller, the controller parameters and fractional order and gain of the derivative filter are tuned by particle swarm optimization (PSO) algorithm. The PSO algorithm searches the optimum solution in the specified search space for the controller and filter parameters to minimize integral of time-weighted squared error (ITSE) performance index. The obtained results are compared to some studies in the literature. As a result, superiority of the PIDFF controller in terms of transient and steady state characteristics is demonstrated. The robustness test of the designed PIDFF controller is also considered.