Stabilization of inter-area oscillations in two-area test system via centralized interval type-2 fuzzy-based dynamic brake control

Mohamed Fayez,Mohamed El-Hadidy,Fahmy Bendary,Mohamed Mandor

doi:10.1186/s43067-020-00027-2

Abstract

Inter-area oscillations are, by far, the most detrimental oscillation category to the integrity of synchronously interconnected power systems. Inter-area oscillations are characterized by the inherent weak damping. The inherent poor damping associated with the inter-area oscillations leaves open wide probabilities for irrevocable widespread blackouts with the consequent eventual devastating outcomes measured in terms of the huge economic casualties and the possible human fatalities. The main purpose of this work is to mitigate inter-area power oscillations. This article explores the effectiveness of dual thyristor controlled braking resistor units with Interval Type-2 fuzzy-based centralized architecture for neutralizing the jeopardy of inter-area power oscillations in Kundur’s two-area test system using MATLAB™/Simulink environment. The effectiveness of the proposed scheme is examined by considering four case studies with different degrees of severity. The simulation results show that the proposed scheme is simple yet effective in treating the inter-area oscillations appropriately under the considered case studies.

Highlights

Inter-area mode, inter-area, oscillations are associated with a combination of closely coupled coherent generators or generating stations in a power system swinging with respect to another combination of closely coupled coherent generators or generating stations in another power system [1]
This work explores a centralized Interval Type-2 fuzzy logic controller (IT2FLC) to symphonize the switching operation of dual Thyristor Controlled Braking Resistor (TCBR) in a coordinated fashion for the purpose of stabilizing the inter-area power oscillations provoked in Two-area Kundur test system
The key conclusion of this article is that the employment of dynamic resistor braking is providing an excellent supplemental damping to negatively damped inter-area oscillatory behavior manifested under stressed operating conditions

Summary

Introduction

Inter-area mode, inter-area, oscillations are associated with a combination of closely coupled coherent generators or generating stations in a power system swinging with respect to another combination of closely coupled coherent generators or generating stations in another power system [1]. This work explores a centralized Interval Type-2 fuzzy logic controller (IT2FLC) to symphonize the switching operation of dual TCBRs in a coordinated fashion for the purpose of stabilizing the inter-area power oscillations provoked in Two-area Kundur test system. System model In this work, the popular Two-area Kundur test system is considered to examine the stabilization performance of the proposed scheme It is an interconnected power system with two-area and the one-line diagram of the test system is shown in Fig. 1 [7]. Both TCBRs are controlled by a centralized IT2FLC to harmonize the interventions of the dual dynamic brake for the test system. If ωArea is equal ωArea the O MIBSpeed is zero and there is no TCBR1

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Conclusions