Faculty Publications
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Item Development of a PC based multi-function recorder for the laboratory model power system on RTAI-Linux platform(2012) Deepak, M.; Shubhanga, K.N.This paper presents the development of a PC based multi-function recorder using an open-source real-time application interface (RTAI) in Linux environment. Here, various quantities such as three-phase real and reactive power (including the sign), power factor, RMS value of the voltage and currents and frequency are estimated employing the instantaneous samples of 3-phase voltages and currents. Such a setup not only permits easy handling of plots in an off-line environment, but also helps to visualize the operating conditions of machines which are generally learnt only by mathematical models and time-domain simulations. In the paper, this aspect has been demonstrated by acquiring the operating conditions of a lab synchronous machine when it is subjected to loss-of-synchronism and loss-of-excitation. Further, since the system provides values of quantities in real-time, it is found that such a set up can be upgraded to a protective relaying system, for example, reverse power detection relay, and even for controller implementation. © 2012 IEEE.Item Development of a digital excitation system for synchronous generator on RTAI-Linux platform(2012) Deepak, M.; Shubhanga, K.N.In this paper realization of a digital excitation system for synchronous generator is discussed. Such a real-time task is implemented using Real-Time Application Interface on Linux platform which is an open source effort. In this work a static excitation system is considered which involved the development of additional hardware circuits such as fully-controlled thyristor bridge-rectifier, the associated firing circuit module and data acquisition systems. In addition to normally discussed proportional controller, a proportional-integral controller is also realized to understand its generator voltage regulation performance under different operating conditions. Case studies are presented related to both standalone and parallel operation conditions of the generator without taking up complex controller-tuning procedures. Such a setup is found to augment the generally employed simulation-based power system dynamics analysis. © 2012 IEEE.