Abstract
A new, adaptive, fuzzy type-2 fast terminal, synergetic multi-machine power system stabilizer is proposed in this study, based on the Bat algorithm. The time spent to reach the equilibrium point, from any initial state, is guaranteed to be finite. The adaptive fuzzy type-2 design is applied to estimate the unknown functions of a multi-machine power system. The parameters of the fast terminal synergetic control are optimized, using bat metaheuristic method. In order to test the robustness of the proposed stabilizer, three load conditions, of the multi-machine power system are studied. A comparison of the proposed adaptive fuzzy type-2 synergetic power system stabilizer with bat conventional approach is presented, indicating improved performance. The control system stability is assessed by the second theorem of Lyapunov and is proven to be asymptotically stable.
Highlights
A power system must remain stable and capable of withstanding a wide range of disturbances, in order to provide secure and reliable services
This study proposes an adaptive fuzzy type-2 fast terminal synergetic power system stabilizer
To demonstrate the stability enhancement achieved with the proposed stabilizer, a three-phase fault test is applied at bus 7 of the multi-machine power system, with duration of 60ms before its clearance
Summary
A power system must remain stable and capable of withstanding a wide range of disturbances, in order to provide secure and reliable services. A dynamic model of the system can be described, by the relationships between active and reactive powers and the bus voltage and frequency [1]. In a stable power system, when synchronous generators are subjected to a disturbance, they either return quickly to their original state or to a new stable operating point. Power systems are complex nonlinear systems that often exhibit low frequency oscillations, due to insufficient damping caused by adverse operating conditions, which can lead the underlying machine to lose synchronism [3]. Conventional PSS, consisting of cascade connected lead–lag compensators derived from a linearized model of the power system around a certain operating point have long been used to damp oscillations, regardless of the varying loading conditions or disturbances
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