Voltage stability is the capability of the power system to preserve the system under stable condition even exposed to small disturbances under normal or slightly over loaded conditions. Maintaining voltage stability is the one of the major factor for power system networks. In this paper new line established voltage stability index entitled fast voltage stability index (FVSI) is proposed for optimal placement of Thyristor Controlled Series Capacitor (TCSC). Optimal tuning of TCSC is obtained using Cuckoo Search Algorithm (CSA) to improve the voltage stability of the power system established on minimization of the total voltage deviation of the system. The CSA is coded in MATLAB and the performance is tested on Institute of Electrical and Electronics Engineers (IEEE) 30 bus test system with voltage deviation minimization as objective function. TCSC is a series connected device in the Flexible Alternating Current Transmission System (FACTS) family. It has capable of controlling the power flow through the line and also improve the line based voltage stability. In this paper TCSC is merged in CSA based Power Flow to optimize the total voltage deviation. Results attained by CSA are related to that attained by Genetic Algorithm (GA) in both without and with TCSC conditions. These results show that CSA produce better results compared to GA for solving optimal tuning of TCSC.
Now-a-days to ensure power continuity and system's reliability the protection system is to be designed properly for distribution systems to handle the faults to avoiding the damage to the equipments and to the service engineers. Different types of relays with different working principles are used to detect different types of faults in the system. In order to avoid mal operation of relays, proper coordination is to be carried out. The objective of this paper is to maintain the relay coordination as well as to decrease the working time of relays by optimizing the values of time dial setting (TDS) using linear programming problem technique (LPP). The inequality constraints guarantee the coordination margin for each primary or backup relay pairs having a fault very close to the primary relay. Simulation is carried out on a IEEE 15 bus balanced radial distribution system with 3 different types of relays namely standard inverse, extremely inverse and very inverse relay and the results are presented and analyzed.
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