Robust Transient Stability Control by a Combined Resistive Type Superconducting Fault Current Limiter and Energy Capacitor System

Naowarat Tephiruk(1*), Komsan Hongesombut(2)

(1) Departmennt of Electrical Engineering, Facult of Engineering, Kasetsart University, Bangkok, 10900, Thailand
(2) Departmennt of Electrical Engineering, Facult of Engineering, Kasetsart University, Bangkok, 10900, Thailand
(*) Corresponding author


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Abstract


This paper presents a robust transient stability control of an interconnected power system using a combined resistive type superconducting fault current limiter (R-SFCL) and energy capacitor system (ECS). Ordinarily, when a fault occurs in a power system network close to the ECS, the voltage at the ECS location drops to nearly zero, and consequently, the output power of the ECS during the charged/discharged process is also nearly zero resulting to the malfunction of the ECS to interchange the active and reactive power between the ECS and the power system. To solve this problem, a combined R-SFCL and the ECS is applied to a power system and to obtain a robust control, the H  loop shaping control ( H LSC) is used in the design of the stabilizing controller of the ECS. The effectiveness of the proposed method in terms of reduction of the first transient swing and enhancement of the damping of the oscillations is demonstrated by using the results from computer simulations. The simulation results reveal that a combined R-SFCL and ECS can help reduce the first transient swing and improve the damping performance of oscillations more effectively, compared to the one with only ECS. Moreover, by using the proposed method, it is found that the size of the ECS is also reduced significantly
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Keywords


Energy Capacitor System; Resistive Type Superconducting Fault Current Limiter; Robust Stability; H Loop Shaping Control

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