S. A. Soman

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Postfault rotor angle oscillations lead to power swings. Both unstable and stable swings can induce distance relay tripping. For unstable swings, a new computational procedure to locate all of the electrical centers is developed. It simplifies the work associated with visual screening of all the R-X plots. For stable swings, a generic three-tier hierarchy(More)
We study the effect of decomposing a series into multiple components and performing forecasts on each component separately. The focus here is on sales data most of the series considered display both seasonality and trend. Hence the original series is decomposed into trend, seasonality and an irregular component. Multiple forecasting ‘experts’ are used to(More)
The Load Serving Entity (LSE) requires, for its power procurement portfolio management, accurate peak load forecast in medium term (upto six months ahead). A complete description of the random variable, i.e., load, is provided by probability density function. Hence, we consider the problem of forecasting probability density function of hourly peak load(More)
The typical requirement of supply-demand balance in electricity market necessitates for an LSE to incorporate corrective measures in short term. In case of surplus, either few of the contracts may have to be backed down and/or excess power has to be sold in short term market(s). In contrast, deficit scenario has to be managed by procuring additional(More)
Current transformers form an integral part of protective systems. Ideal Current Transformers (CTs) are expected to reproduce the primary current faithfully on the secondary side. Often, during fault conditions an important component of current is exponentially decaying DC offset current. Under such conditions the CT saturates, and hence it cannot reproduce(More)
Age is an important trait used for identity authentication. The factors that affect aging process include a person’s gene, health, living style etc. Age Estimation is predicting a person’s age. Out of these, face is the most convenient one. Age Estimation has lots of real-world applications, such as security control, biometrics, customer relationship(More)
This paper addresses the problem of curtailing the number of control actions and minimizing controller movements for real-time voltagelreactive power control. Algorithms are proposed to identify the most effective subset of control actions and to minimize controller movements. An algorithmic objective function appropriate for the treatment of system(More)
The paper reports the output of a large ongoing programme of research to determine high effectiveness strategies for deploying TRIZ. The most successful single study in the research involved 2 nd to 4 th year engineering students at IIT. Starting from zero prior knowledge, a batch of 12 students was exposed to 10 hours of specially formulated TRIZ lectures(More)
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