Optimal Design and Allocation of HTS-FCL for Transmission System Security and Stability Enhancement

Student thesis: Master's Thesis


Power systems suffer from escalating fault levels that impact system's security, reliability, and investments. This research investigates different FCL topologies and gives detailed evaluation for each. Accordingly, HTS-FCL is proposed to be used to enhance security and stability in a given network. Thus, a new problem formulation to find optimal location and rating for a given number of HTS-FCL is proposed taking into consideration angular and voltage stability issues instead of the conventional FCL optimization problems that only tackle fault mitigation objectives. The problem is formulated as Mixed Integer Non-Linear Programming (MINLP) problem and a combination of continuous and binary particle swarm optimization is used to find optimal location and ratings based on three objective functions for fault level mitigation, angular and voltage stability enhancement. A new multi-objective framework using a weighted sum approach with deploying novel angular and voltage stability indices is implemented. The optimization problem is tested in the New-England system (IEEE 39 bus) and optimal solutions are validated using RMS and transient models in MATLAB and PSCAD respectively. Results demonstrate the effectiveness of the proposed stability indices ASI and VSI. Also, it proves the reliability of the multi-objective optimization approach that accounts for both transient stability and fault mitigation. HTS-FCL was also proposed for FRT enhancement in large scale DFIG-based wind parks. Results show the applicability of the proposed configuration and control strategy in fulfilling most challenging grid code requirements.
Date of Award2013
Original languageAmerican English
SupervisorMohamed El Moursi (Supervisor)


  • HTS-FCL; System Security; System Stability.

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