Modern power networks are enormously complex and frequently interconnected by weak tie-lines, which results in a variety of stability issues such as low frequency oscillations (LFOs). LFOs can have a negative impact on power system stability and tie-line transmission capacity, resulting in catastrophic blackouts if suitable damping control mechanisms are not in situ. This article demonstrates a robust design of damping control for inter-area LFO damping in an interconnected power system. A new comprehensive approach is presented, which integrates the thyristor controlled series compensator (TCSC) and superconducting magnetic energy storage (SMES) to improve the damping of critical inter-area modes. An intelligently designed fuzzy logic control (FLC) employing a global stabilizing feedback signal constitutes the supervisory controller. The stabilizing feedback signal is obtained based on the observability of critical modes using participation factor (PF) analysis. Moreover, a maiden application of a recently proposed optimization algorithm, Kmeans optimizer (KO), is employed to simultaneously tune the parameters of FLC employed for coordinated operation of SMES and TCSC. To validate the robustness of the proposed scheme, several case studies are performed on Kundur's two-area multi-machine test system. A comparison with a residuebased damping controller was also done to demonstrate the superior damping efficacy of the proposed KOFLC controller.
Economical and technical advantages inherent in the coordinated operation of power systems resulted in large-scale grid interconnection. The major concern regarding the interconnection of the neighbouring power systems with relatively weak tie-lines is the appearance of poorly damped electromechanical oscillations. Inter-area (IA) oscillations reduce system stability and transmission capacity, and without an efficient damping mechanism, these oscillations can cause system failure and even lead to large-scale blackouts. In this work, the impact of variable frequency transformer (VFT) on the IA oscillations of a two-area power system connected in series with the tie-line is investigated. The VFT is a recent power transmission technology that offers continuous control over bi-directional power flow with no harmonic injection. The VFT is made up of a rotary transformer for continuously regulated phase shift, as well as a drive system and control that regulates the power flow through the VFT by adjusting the angle and speed of the rotary transformer. The VFT is controlled to increase system damping, and consequently suppress inter-area oscillations. A comprehensive model of the interconnected power system including VFT is developed in the MATLAB/Simulink environment to study the efficacy of the proposed scheme.
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