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Distance relays are widely used as main and back-up protection for transmission lines. Their operation is based on impedance measurement at the relaying point, which can be affected by several factors, including pre-fault line loading and short circuit levels at the line ends. The problem of growing loads and limited paths for new transmission lines, has been somehow overcome by introduction of flexible...
An algorithm for optimal allocation of reactive power in AC/DC system using FACTs devices, with an objective of improving the voltage profile and also voltage stability of the system has been presented. The technique attempts to utilize fully the reactive power sources in the system to improve the voltage stability and profile as well as meeting the reactive power requirements at the AC-DC terminals...
The objective of this paper is to control the real and reactive power feed to a grid from a solid-oxide fuel cell plant independently. The modification in the thermal dynamic model of the solid-oxide fuel cell is carried out to include the simulation time step. The controller performance analysis is done on a fuel-cell model developed in Matlab/Simulink platform. It is found from simulation that the...
This paper presents a comprehensive approach for designing UPFC controllers (decoupled real & reactive power flow controllers, DC link and AC voltage regulators & UPFC based damping controller). For designing the controllers, the detailed model of the system with UPFC has been considered. Investigations clearly show that the real and reactive power flows on the line can be effectively regulated...
This paper presents an approach to control the power flow and regulate the DC voltage at the DC link of voltage source converter (VSC) based high voltage DC (HVDC) transmission system. Two identical converters used at both rectifier and inverter ends. The switching of the converter is carried out at fundamental frequency switching. The power flow between the two stations is controlled by controlling...
The limits of controllable power flow in the transmission line with the UPFC are determined by the equipment ratings and the line limits. In this paper, boundaries of controllable power flow in a simple two machine power system with UPFC based on a geometrical approach are investigated. The main advantage of this geometrical approach is that even with a minimum computational effort, it gives a clear...
In this paper, AC optimal power flow combined with UPFC has been used to manage the congestion of transmission lines in a restructured power system with pool market model. The modeling of unified power flow controller (UPFC) has been adopted based on bipolar model and power injection method. To determine an appropriate location for UPFC as well as to set its parameters, an approach based on genetic...
Notice of Violation of IEEE Publication Principles"Security Enhancement of Optimal Power Flow using Genetic Algorithm"by N.B. Muthuselvan, P. Somasundaram, and Subhransu Sekhar Dashin the Proceedings of the International Conference on Power Electronics, Drives and Energy Systems, December 2006After careful and considered review of the content and authorship of this paper by a duly constituted...
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