Subhadip Bhattacharya - Academia.edu (original) (raw)
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Papers by Subhadip Bhattacharya
International Journal of Electrical Power & Energy Systems, 2022
International Journal of Electrical Power & Energy Systems, 2022
2021 IEEE 2nd International Conference On Electrical Power and Energy Systems (ICEPES), 2021
This paper estimates the financial loss incurred by the Indian power sector due to the reduction ... more This paper estimates the financial loss incurred by the Indian power sector due to the reduction in electricity demand during the lockdown period. The net reduction of 68 TWh in energy demand from 25 March 2020 till 3l August 2020 compared to the same period in 2019. A previously performed multi-sectoral regression analysis between the percentage reduction in electricity demand and the different sectoral share of electricity consumption of all the Indian states has been utilised to calculate the notional financial loss incurred by the Indian power sector. This loss has been segregated into four upstream power delivery components: DISCOMs’ revenue erosion due to the forgone cross-subsidising premium which was previously recovered from the bulk C&I consumers, increased AT&C loss due to higher residential and low voltage (LV) agricultural consumption, forgone fixed charges by the central generating utilities, and GENCOs’ reduction in its cost of supply due to the avoided fuel cost owing to the overall low demand.The results from the study indicate that the loss incurred by the DISCOMs during this 160 days of lockdown in 2020 amounts to INR 571 billion, which is almost 10 % of the total revenue recovered in 2019. The AT&C loss and others contribute an additional INR 289 billion, whereas the GENCOs could have a net savings of INR 180 billion. Therefore, the notional net loss for the Indian power sector amounts to INR 680 billion. It translates to a loss of INR 1.30 per unit of energy delivered during this entire period. Four out of the twenty-eight states, namely Maharashtra, Gujarat, Tamil Nadu and Uttar Pradesh, share more than 50 % of the total financial loss. Overall, the combined C&I load demand had reduced to half of its 2019 share of 42 %. Mitigation of this loss necessitates immediate interventions in the form of regulatory (regular tariff revisions and direct benefit transfer of subsidies) and operational (reduction in AT&C losses by feeder separation) reforms to avoid such losses in case of similar extreme events in future.
International Journal of Modern Trends in Engineering and Research, 2016
Tilt correction of images is an important step of different object recognition algorithms. In thi... more Tilt correction of images is an important step of different object recognition algorithms. In this paper we proposed a method to correct the tilt in images using linear symmetry feature. Linear symmetry feature is extensively used in OCR technology and finger print recognition. We propose to use this in a generalized way to recognize the tilt in surveillance images. Long and sharp vertically or horizontally oriented edges in the image are used as reference for tilt correction. Keywords — Gaussian filter, linear symmetry, noise removal, orientation tensor, skew detection, skew estimation and removal, Tilt correction. I. INTRODUCTION In the images captured by surveillance cameras the tilt can occur due to misalignment of the camera as it is dynamic handled or due to the faulty alignment of objects where the objects deviated from their original inclination. The amount of tilt can be recognized using the proposed method. The orientation of the major objects in the image provides for the...
2020 International Conference on Computer, Electrical & Communication Engineering (ICCECE), 2020
Mineral oil (MO) had been in use in transformers for over a century. However, with the ever-incre... more Mineral oil (MO) had been in use in transformers for over a century. However, with the ever-increasing upsurge in voltage and power levels coupled with the depleting reserves of fossil fuels led researchers all over the globe to tread down the uncharted territory of finding suitable alternatives to mineral oil as a transformer insulation. Several types of research have been conducted since the late 90’s to determine the viability of these alternate fluids. Esters among several other fluids have evolved as a suitable substitute for mineral oil insulation mainly due to its environment-friendly nature and ability to replenish in large quantities. Substantial research is been carried out in several countries like USA, UK, China, Japan, Australia, Brazil, and India. This article is a compilation of several recent research works in the field of alternate fluids as transformer insulation which promises to help not such budding researchers but also utilities dealing with such fluids. It als...
Advances in Intelligent Systems and Computing
In this chapter, we present the problems associated with various types of loading and faults occu... more In this chapter, we present the problems associated with various types of loading and faults occurring in an interconnected power system. Reliability and quality are the two most important facets of any power delivery system. The basic objective of this chapter is two folds—first, to understand the various types of fault disturbances in a power system and ways to mitigate these problems using DSTATCOM. Power Electronic converters have played a pivotal role in the control of power quality mainly due to their fast action, reliability, and lower cost in comparison to conventional electro-mechanical controllers. To obtain the desired objective, IGBT-based voltage source converter (VSC) operating at high frequencies using sinusoidal pulse width modulation (SPWM) is used. For efficient reduction in harmonic contents, passive LCL filter is used at the point of common connection (PCC). Here, various kinds of faults commonly occurring in a power system are induced, and their impact on power quality is monitored. All the simulation is done using MATLAB Simulink using Sim Power Systems Blockset (PSB) Toolbox.
2017 International Conference on Smart grids, Power and Advanced Control Engineering (ICSPACE)
This paper presents a mathematical model and numerical simulation results for heat transfer analy... more This paper presents a mathematical model and numerical simulation results for heat transfer analysis that takes place at the frame level of a rotating electric machines provided with longitudinal cooling fins. For this purpose a relatively complex three-dimensional model is used, numerical treatable with affordable hardware and software resources. The frame-environment convective heat transfer process is considered. The frame is cooled by forced convection in two cases: the thermal radiation heat transfer is taken into account and without considering it. Numerical simulation results reveal the heat transfer pathways from the frame to the environment, and allow assessment of important parameters in designing the machine's cooling.
International Journal of Electrical Power & Energy Systems, 2022
International Journal of Electrical Power & Energy Systems, 2022
2021 IEEE 2nd International Conference On Electrical Power and Energy Systems (ICEPES), 2021
This paper estimates the financial loss incurred by the Indian power sector due to the reduction ... more This paper estimates the financial loss incurred by the Indian power sector due to the reduction in electricity demand during the lockdown period. The net reduction of 68 TWh in energy demand from 25 March 2020 till 3l August 2020 compared to the same period in 2019. A previously performed multi-sectoral regression analysis between the percentage reduction in electricity demand and the different sectoral share of electricity consumption of all the Indian states has been utilised to calculate the notional financial loss incurred by the Indian power sector. This loss has been segregated into four upstream power delivery components: DISCOMs’ revenue erosion due to the forgone cross-subsidising premium which was previously recovered from the bulk C&I consumers, increased AT&C loss due to higher residential and low voltage (LV) agricultural consumption, forgone fixed charges by the central generating utilities, and GENCOs’ reduction in its cost of supply due to the avoided fuel cost owing to the overall low demand.The results from the study indicate that the loss incurred by the DISCOMs during this 160 days of lockdown in 2020 amounts to INR 571 billion, which is almost 10 % of the total revenue recovered in 2019. The AT&C loss and others contribute an additional INR 289 billion, whereas the GENCOs could have a net savings of INR 180 billion. Therefore, the notional net loss for the Indian power sector amounts to INR 680 billion. It translates to a loss of INR 1.30 per unit of energy delivered during this entire period. Four out of the twenty-eight states, namely Maharashtra, Gujarat, Tamil Nadu and Uttar Pradesh, share more than 50 % of the total financial loss. Overall, the combined C&I load demand had reduced to half of its 2019 share of 42 %. Mitigation of this loss necessitates immediate interventions in the form of regulatory (regular tariff revisions and direct benefit transfer of subsidies) and operational (reduction in AT&C losses by feeder separation) reforms to avoid such losses in case of similar extreme events in future.
International Journal of Modern Trends in Engineering and Research, 2016
Tilt correction of images is an important step of different object recognition algorithms. In thi... more Tilt correction of images is an important step of different object recognition algorithms. In this paper we proposed a method to correct the tilt in images using linear symmetry feature. Linear symmetry feature is extensively used in OCR technology and finger print recognition. We propose to use this in a generalized way to recognize the tilt in surveillance images. Long and sharp vertically or horizontally oriented edges in the image are used as reference for tilt correction. Keywords — Gaussian filter, linear symmetry, noise removal, orientation tensor, skew detection, skew estimation and removal, Tilt correction. I. INTRODUCTION In the images captured by surveillance cameras the tilt can occur due to misalignment of the camera as it is dynamic handled or due to the faulty alignment of objects where the objects deviated from their original inclination. The amount of tilt can be recognized using the proposed method. The orientation of the major objects in the image provides for the...
2020 International Conference on Computer, Electrical & Communication Engineering (ICCECE), 2020
Mineral oil (MO) had been in use in transformers for over a century. However, with the ever-incre... more Mineral oil (MO) had been in use in transformers for over a century. However, with the ever-increasing upsurge in voltage and power levels coupled with the depleting reserves of fossil fuels led researchers all over the globe to tread down the uncharted territory of finding suitable alternatives to mineral oil as a transformer insulation. Several types of research have been conducted since the late 90’s to determine the viability of these alternate fluids. Esters among several other fluids have evolved as a suitable substitute for mineral oil insulation mainly due to its environment-friendly nature and ability to replenish in large quantities. Substantial research is been carried out in several countries like USA, UK, China, Japan, Australia, Brazil, and India. This article is a compilation of several recent research works in the field of alternate fluids as transformer insulation which promises to help not such budding researchers but also utilities dealing with such fluids. It als...
Advances in Intelligent Systems and Computing
In this chapter, we present the problems associated with various types of loading and faults occu... more In this chapter, we present the problems associated with various types of loading and faults occurring in an interconnected power system. Reliability and quality are the two most important facets of any power delivery system. The basic objective of this chapter is two folds—first, to understand the various types of fault disturbances in a power system and ways to mitigate these problems using DSTATCOM. Power Electronic converters have played a pivotal role in the control of power quality mainly due to their fast action, reliability, and lower cost in comparison to conventional electro-mechanical controllers. To obtain the desired objective, IGBT-based voltage source converter (VSC) operating at high frequencies using sinusoidal pulse width modulation (SPWM) is used. For efficient reduction in harmonic contents, passive LCL filter is used at the point of common connection (PCC). Here, various kinds of faults commonly occurring in a power system are induced, and their impact on power quality is monitored. All the simulation is done using MATLAB Simulink using Sim Power Systems Blockset (PSB) Toolbox.
2017 International Conference on Smart grids, Power and Advanced Control Engineering (ICSPACE)
This paper presents a mathematical model and numerical simulation results for heat transfer analy... more This paper presents a mathematical model and numerical simulation results for heat transfer analysis that takes place at the frame level of a rotating electric machines provided with longitudinal cooling fins. For this purpose a relatively complex three-dimensional model is used, numerical treatable with affordable hardware and software resources. The frame-environment convective heat transfer process is considered. The frame is cooled by forced convection in two cases: the thermal radiation heat transfer is taken into account and without considering it. Numerical simulation results reveal the heat transfer pathways from the frame to the environment, and allow assessment of important parameters in designing the machine's cooling.