Load Monitoring using Power Line Carrier Communication (PLCC) Systems

The Power Lines today available were built for the purpose of power transmission from one place to another. The attempt to transmit data over these power lines leads to the reception of a lot of noise. This noise is due to the numerous devices connected to the power lines. An analysis of this noise and their characteristics helps us better understand how to tackle the problem of noise elimination in the Power Lines. The characteristics of the modulation techniques and their subsequent analysis gives us an idea of the advantages and disadvantages of each technique. The receiver contains a phase locked loop. We studied the modulation techniques and compared their performance in the present of noise. Finally Spread Spectrum technology is reviewed for the use of communications on Power Lines. Spread Spectrum is a method of signal modulation where the transmitted signal occupies a bandwidth considerably higher than the minimum necessary to send the information and some function other than the information being sent is used to increase this Bandwidth. Spread Spectrum was found to be unsuitable and rather detrimental for the PLCC system. This paper deals with the implementation of the power line carrier system based load controlling using LabVIEW. The new topology of speed control of induction motor using PLCC technology is successfully implemented in this work. This is the one of the method for controlling the speed, which is employed for AC motor drives.