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Renewable sources suffer from intermittency and variability in time and amount of power, causing problems of integration with the grid. Field experience in deregulated systems has occasionally shown that increase of renewable injections such as wind, solar etc. to the main grid depresses voltages at the point of interconnection. We pose the question: is it possible to analytically predict such behaviour...
In the fast evolving world of information age, the value of open data is being recognized around the world. The information and communication technologies are making it easier to collect and store data. The consequent use of this data is leading to smartness in the respective sectors. Since power infrastructure is critical for national security, the availability and access to data is one of the hurdle...
With advent in wide area measurement systems (WAMS), measured data from different buses in the power system are now available for calculations. Model verification of power system components is identified to be an application of WAMS. Model verification of series compensation devices can be performed during fault to determine the compensation level and metal-oxide varistor characteristic. Methods for...
Planar Rogowski Current Sensor works on the principle of electromagnetic induction as conventional iron core current transformers. In iron core current transformer, the core saturates beyond a certain current value which introduces nonlinearity in the desired output. Unlike iron-core current transformer, planar rogowski is an air core device and used for measuring alternating and transient currents...
MW-Mile Method is frequently used for allocating the transmission cost among the users. This method is formulated based on the actual usage of transmission network by each user. But, this method allocates the unfair charges to the users as it doesn't consider the transmission losses and the variation these losses according to the user power factor. In this paper MW-Mile Method is modified by considering...
Issues on the life of stator insulation in the Inverter fed drives have been a concern for researches over the last two decades. The high frequency switching pulses at the output waveform of the Power Electronic Converter (PECs) are the main cause for the enhanced stress on the winding thus causing premature insulation failure on the motors. In this work, the breakdown tests are conducted on twisted...
Increasing voltage level in generation and transmission system have become inevitable. The threats of non-ionizing radiation and their biological effects at substations have increased. As per International Commission for Non-Ionizing Radiation and Protection (ICNIRP) guidelines suggest maximum limits for electric and magnetic field exposure is 10 kV/m and 1 mT for occupational and 5 kV/m and 250 μT...
Secured and uninterrupted operation of the power systems has become a great challenge. The load on the practical power systems vary through the day, month and year. Thus making the task of the power system engineers much more complicated. In this paper, a novel index, namely, composite severity contingency distribution index (CSCDI) has been proposed in order to find the severe-most line of the system...
From last few decades, the frequent occurrence of the voltage collapse has attracted more and more attention. Voltage collapse is the system instability, usually, associated with the shortage of reactive power at the load end involving the entire power systems. The most effective method to counter voltage collapse is to find out the possible locations where voltage collapse may occur i.e. to find...
Polarization Depolarization Current method of dielectric testing is popularly used by the utilities for condition assessment of the insulation of power transformers. Test temperature is an important factor that affects the polarization depolarization current data measured. In this work the effect of test temperature in condition assessment of cellulosic part of oil-paper insulation using polarization...
In the fast evolving world of information age, the value of open data is being recognized around the world. The information and communication technologies are making it easier to collect and store data. The consequent use of this data is leading to smartness in the respective sectors. Since power infrastructure is critical for national security, the availability and access to data is one of the hurdle...
This paper presents a novel approach for calibration of Instrument Transformers (ITs) using synchrophasor data. The proposed algorithm detects the presence of bad data using Largest Normalized Residual (LNR) test in a step and discards the corresponding measurements. This method is intended to work as a filtering scheme that can significantly improve the accuracy of Current Transformers (CT) and Capacitive...
In the event of a lightning impulse to the high voltage terminal of a dry type transformer, uneven impulse stress occurs on its windings. The impulse voltage may further shoot up owing to resonance condition which results in additional turn to turn and coil to coil voltage difference. In this paper, comprehensive modeling of transformer is done by calculating circuit parameter of transformer for each...
This paper presents the statistical analysis of Grid events in the Western Regional Power System of India. The major findings and recommendations derived out of the analysis provided vital inputs for prioritizing the measures to be taken for improving compliance to technical standards, improving the operation and maintenance practices, planning for equipment upgrades and ultimately in enhancing the...
This paper presents an application of adaptive control for the integration of single phase single stage solar photovoltaic (SPV) system to a single phase AC grid. The primitive of this integration of single-phase SPV system with the grid comprises of mitigation of harmonics, reactive power compensation and PFC (Power Factor Correction). It deals with a new mean adaptive detection (MAD) technique based...
In India, distribution losses are substantial from pilferage of distribution lines and connected equipment like energy meters, distribution boxes and various connectors. Few SEBs (State Electricity Boards) have started using Arial Bunched cables for prevention against theft by direct hooking on conductors but it has been observed that maximum power theft occurs through distribution box which makes...
In decentralized dispatch philosophy, system operator (SO) only deviate the final schedules in order to maintain network security (i.e. line overloading, outages, voltage and frequency deviations, etc.) in real time operation. Before going for the dispatch deviations, SO has the option of changing the network topology (i.e. switching of transmission lines) so as to redistribute the power from anticipated...
Battery Energy Storage System (BESS) is widely being implemented along with Solar PV to mitigate the inherent intermittencies of solar power. Solar smoothing is one such application of BESS. In this paper, different techniques for solar power smoothing is compared. An energy compensation based smoothing technique is proposed in this paper. The smoothing method not only ensures an optimal sizing of...
The system operating costs and long-term reliability of the PV modules is significant in reducing the total lifetime cost of the PV system. In this context the diagnostic methods in identifying the degradation affecting PV array is important. Previous studies on degradation in PV modules showed that degradation leads to either decrease in shunt resistance or increase in series resistance of the PV...
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