Electrical power theft is the main cause of Non Technical Losses (NTL) in the electrical power system. This paper is intended to provide with an innovative scheme for the detection and monitoring of Electrical power theft in the Electricity distribution system based on the principle of Power line Communication. A Narrow band power line carrier signal is injected into the distribution power line along with the power frequency signal (230V, 50Hz). Any illegal utilization of electricity will be detected with the differential change in the amplitude of the narrow band carrier signal which can be detected with precision. Simulation results using MATLAB software are provided showing that the scheme is simple and efficient.

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Power quality plays a very important vital role in the modern utility grid where sensitive loads are employed. Equipment damage, temporary shutdowns, product quality degradation and Voltage Sag are the major problem associated with power quality. Dynamic Voltage Restorer (DVR) is a powerful device which is used to improve voltage mitigation of weak buses associated in a multi-bus system. This paper incorporates the functional performance of DVR during voltage sag in the power system. Penetrating a voltage of required magnitude and frequency to restore the voltage across the load within the desired amplitude is the main objective of DVR. The proposed work based on modeling and simulation of DVR, in a closed-loop control of an eight bus system. Voltage compensation is done effectively using DVR in the Closed loop FLC controlled system and its analyzed with PID Controlled system. The simulation result shows Closed loop FLC system using DVR is observed to be faster than PID controlled systems.

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