Design of wide area fractional-order PID damping controller for inter-area low-frequency oscillations using differential evolution

Saleh M. Bamasak, Sreerama R. Kumar, Yusuf A. Al-Turki

Abstract


A Wide Area Measurement System (WAMS) can extend and effectively improve a controllers’
capability of damping inter-area low-frequency oscillations in interconnected power systems. This
paper presents an implementation of a Wide Area Fractional-Order Proportional-Integral-Derivative
(WA-FOPID) damping controller to improve the system damping. A modal analysis approach is
proposed to identify the best location for the WA-FOPID controller and the optimal combination
of input signals. The differential evolution optimization algorithm is used to determine the optimal
controller parameters, and a nonlinear time-domain-based objective function is formulated to
minimize the time-weighted errors. The proposed approach is successfully applied to a two-area
four-machine system, as well as to a practical multi-area power system. The nonlinear timedomain
simulations indicate that the proposed WA-FOPID damping controller can effectively
dampen inter-area oscillations and improve system stability, irrespective of the severity or location
of disturbances.


Keywords


Differential Evolution (DE); Fractional-Order PID (FOPID); Oscillation Damping; Phasor Measurement Unit (PMU); Wide Area Damping Controller (WADC)

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References


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