A New Cascade Fuzzy Power System Stabilizer for Multi-machine System Stability Enhancement
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A New Cascade Fuzzy Power System Stabilizer for Multi-machine System Stability Enhancement Brahim Douidi1 · Lakhdar Mokrani1
· Mohamed Machmoum2
Received: 10 October 2018 / Revised: 28 April 2019 / Accepted: 6 June 2019 © Brazilian Society for Automatics--SBA 2019
Abstract This paper introduces a new robust controller with cascaded fuzzy blocks as a power system stabilizer (CFPSS) to enhance damping during low-frequency oscillations. This CFPSS is designed to act as a nonlinear lead–lag PSS with a given number of compensation blocks. To demonstrate the efficiency and the robustness of this proposed stabilizer, simulation results performed on the IEEE three-generator nine-bus multi-machine power system subjected to a three-phase short-circuit fault have been carried out. The parameters of the proposed PSS and those of the conventional IEEE linear lead–lag PSS have been tuned by a recently developed optimization technique (krill herd algorithm). The robustness of this novel CFPSS is proved, by optimizing the parameters of the two PSSs for one operating point (normally loaded system) and applying them to other operating points (case of heavy and low loads) with some key parameters variation. The obtained results have shown the superiority and the robustness of the CFPSS comparatively to the conventional IEEE lead–lag PSS in terms of oscillations damping over a wide range of operating conditions and against parametric variation. The same conclusions have been drawn in the case of a large power system (IEEE 16-machine, 68-bus test system) characterized by its local and inter-area oscillations modes. Keywords Multi-machine power system · Conventional lead–lag PSS · Fuzzy cascade PSS · Krill herd optimization algorithm · Small signal stability · Stabilizer robustness
1 Introduction The increasing demand for electrical energy becomes a high big challenge due to the indispensability of this kind of energy. Consequently, power systems become more and more complex and large in scale with power interchanges between different zones of these systems. In this situation, underdamped low-frequency oscillations may appear to influence the whole system. Power system engineers should take the responsibility to provide a stable power of good quality to the consumers (Aboul-Ela et al. 1996). Besides, interconnection of different power systems may give birth to rotoric oscillations in
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Lakhdar Mokrani [email protected]
1
LACoSERE Laboratory, Electrical Engineering Department, Laghouat University, Ghardaïa Street, BP 37, 03000 Laghouat, Algeria
2
IREENA, 37 Boulevard de l’Université, BP 406, 44602 Saint-Nazaire, Nantes, France
the range of 0.2–3 Hz (Pai et al. 2004). If these oscillations are not well mitigated, they may grow, influence the whole system and limit the power-transfer capability. To improve power systems damping, PSSs are implemented in some generators to supply an additional stabilizing signal in the excitation system (Larsen and Swann 1981; Demello and Concordia 1969). These controllers must produce a
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