avdhesh kumar

Performance improvement of grid-integrated PV system using novel robust least mean logarithmic square control algorithm

Electrical Engineering, Apr 5, 2022

Control of Grid Integrated Photovoltaic system using new Variable Step Size Least Mean Square adaptive filter

Electrical Engineering, Apr 15, 2021

Performance Analysis of Grid Integrated PV System using SRF and IRPT Control

With the increase in grid connected PV based generation, degradation of power quality at the poin... more With the increase in grid connected PV based generation, degradation of power quality at the point of common coupling (PCC) has become a serious issue both for electric power utilities and consumers. Improvement in power quality is achieved through power factor correction, reactive power compensation and harmonic mitigation using different control techniques. This paper presents the performance analysis of grid integrated PV and addresses the power quality issues using synchronous reference frame (SRF) and instantaneous reactive power theory (IRPT) technique for inverter control. A 10 kW grid integrated photovoltaic system has been developed. Simulation of developed model is carried out on MATLAB/Simulink.

Modified Synchronous Reference Frame Control of Solar Photovoltaic-Based Microgrid for Power Quality Improvement

Arabian journal for science and engineering, Aug 1, 2020

In this paper, solar photovoltaic (SPV)-based microgrid has been connected to grid. Modified sync... more In this paper, solar photovoltaic (SPV)-based microgrid has been connected to grid. Modified synchronous reference frame control of PV inverter has been proposed to estimate reference current for power quality improvement. Conventionally, DC link voltage of the PV inverter is regulated using proportional integral (PI) controller, which suffers from undershoot/ overshoot and long settling time during load variation. Intelligent control technique can be the better solution with more accuracy and fast dynamic response. In the present work, interval type-2 (IT-2)-based fuzzy logic controller (FLC) has been proposed to control inverter's DC link voltage. Performance of the grid-connected SPV system is analyzed using proposed IT-2 FLC and compared with conventional PI as well as type-1 FLC. It compensates the harmonics of the nonlinear load and maintains the grid at unity power factor by supplying the reactive demand of the load. Total harmonic distortion at grid side of the system is within the limits as per IEEE-519 standard. To test the efficacy of the proposed IT-2 FLC for grid-connected SPV system MATLAB software2016(a) has been used. Power quality (PQ) • Interval type-2 (IT-2) • Fuzzy logic controller (FLC) • Photovoltaic (PV) array • Synchronous reference frame (SRF)

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Performance Analysis of Grid Integrated PV System using SRF and IRPT Control

2019 1st International Conference on Signal Processing, VLSI and Communication Engineering (ICSPVCE), 2019

With the increase in grid connected PV based generation, degradation of power quality at the poin... more With the increase in grid connected PV based generation, degradation of power quality at the point of common coupling (PCC) has become a serious issue both for electric power utilities and consumers. Improvement in power quality is achieved through power factor correction, reactive power compensation and harmonic mitigation using different control techniques. This paper presents the performance analysis of grid integrated PV and addresses the power quality issues using synchronous reference frame (SRF) and instantaneous reactive power theory (IRPT) technique for inverter control. A 10 kW grid integrated photovoltaic system has been developed. Simulation of developed model is carried out on MATLAB/Simulink.

Shear Viscosity of Turbulent Chiral Plasma

arXiv: High Energy Physics - Phenomenology, 2016

It is well known that the difference between the chemical potentials of left-handed and right-han... more It is well known that the difference between the chemical potentials of left-handed and right-handed particles in a parity violating (chiral) plasma can lead to an instability. We show that the chiral instability may drive turbulent transport. Further we estimate the anomalous viscosity of chiral plasma arising from the enhanced collisionality due to turbulence.

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Harmonics Mitigation Techniques in Grid Integrated PV based Microgrid: A Comparative Analysis

2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021

With the increased penetration of photovoltaic (PV) based distributed generation (DG), power qual... more With the increased penetration of photovoltaic (PV) based distributed generation (DG), power quality (PQ) at the point of common coupling (PCC) becomes a major concern mainly due to harmonics. Harmonics, generated by nonlinear loads in the system, are multiples of fundamental frequency. This paper presents the comparative analysis and discussion of various control techniques for VSC of a grid connected PV based micro grid to mitigate the harmonics. The mitigation of harmonics is achieved using control techniques viz. conventional and adaptive of reference generation. Simulation of the developed model is carried out on MATLAB/Simulink. Performance of the system is evaluated under IEEE-519 standard.

New developments in relativistic fluid dynamics with spin

The European Physical Journal Special Topics, 2021

In this work, we briefly review the progress made in the formulation of hydrodynamics with spin w... more In this work, we briefly review the progress made in the formulation of hydrodynamics with spin with emphasis on the application to the relativistic heavy-ion collisions. In particular, we discuss the formulation of hydrodynamics with spin for perfect-fluid and the first order viscous corrections with some discussion on the calculation of spin kinetic coefficients. Finally, we apply relativistic hydrodynamics with spin to the relativistic heavy-ion collisions to calculate the spin polarization of Λ-particles.

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Relativistic dissipative spin dynamics in the relaxation time approximation

Physics Letters B, 2021

The concept of the Wigner function is used to construct a semi-classical kinetic theory describin... more The concept of the Wigner function is used to construct a semi-classical kinetic theory describing the evolution of the axial-current phase-space density of spin-1 /2 particles in the relaxation time approximation. The resulting approach can be used to study spin-polarization effects in relativistic matter, in particular, in heavy-ion collisions. An expression for the axial current based on the classical treatment of spin is also introduced and we show that it is consistent with earlier calculations using Wigner functions. Finally, we derive non-equilibrium corrections to the spin tensor, which are used to define, for the first time, the structure of spin transport coefficients in relativistic matter.

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Modified Synchronous Reference Frame Control of Solar Photovoltaic-Based Microgrid for Power Quality Improvement

Arabian Journal for Science and Engineering, 2020

In this paper, solar photovoltaic (SPV)-based microgrid has been connected to grid. Modified sync... more In this paper, solar photovoltaic (SPV)-based microgrid has been connected to grid. Modified synchronous reference frame control of PV inverter has been proposed to estimate reference current for power quality improvement. Conventionally, DC link voltage of the PV inverter is regulated using proportional integral (PI) controller, which suffers from undershoot/ overshoot and long settling time during load variation. Intelligent control technique can be the better solution with more accuracy and fast dynamic response. In the present work, interval type-2 (IT-2)-based fuzzy logic controller (FLC) has been proposed to control inverter's DC link voltage. Performance of the grid-connected SPV system is analyzed using proposed IT-2 FLC and compared with conventional PI as well as type-1 FLC. It compensates the harmonics of the nonlinear load and maintains the grid at unity power factor by supplying the reactive demand of the load. Total harmonic distortion at grid side of the system is within the limits as per IEEE-519 standard. To test the efficacy of the proposed IT-2 FLC for grid-connected SPV system MATLAB software2016(a) has been used. Power quality (PQ) • Interval type-2 (IT-2) • Fuzzy logic controller (FLC) • Photovoltaic (PV) array • Synchronous reference frame (SRF)

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Spin polarization evolution in a boost-invariant hydrodynamical background

Physical Review C, 2019

Relativistic hydrodynamic equations for particles with spin 1 2 are used to determine the space-t... more Relativistic hydrodynamic equations for particles with spin 1 2 are used to determine the space-time evolution of the spin polarization in a boost-invariant and transversely homogeneous background. The hydrodynamic approach uses the forms of the energy-momentum and spin tensors based on the de Groot, van Leeuwen, and van Weert formalism. Our calculations illustrate how the formalism of hydrodynamics with spin can be used to determine physical observables related to the spin polarization and how the latter can be compared with the experimental data.

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Teachers' awareness and opinion about AIDS: implications for school based AIDS education

The Journal of communicable diseases, 1995

Two hundred thirteen teachers of one secondary and four primary schools of East Delhi were interv... more Two hundred thirteen teachers of one secondary and four primary schools of East Delhi were interviewed to assess their knowledge and attitudes about AIDS and their opinions regarding school based AIDS education. Observations revealed that majority of the teachers were aware of various aspects of HIV/AIDS. However, they also had some misconceptions regarding transmission of the disease. Though, most of the teachers opined that they could play an important role in educating the students as well as the community regarding AIDS/STDs, three fourths of them had never discussed AIDS/STDs with their students. Majority of teachers were in favour of starting class room based education on AIDS/STDs, beginning from secondary classes onwards, and more than half opined that class teacher could educate the students better than the doctors or parents. The results suggest that after being properly trained, teachers can be effectively utilized for educating the students.

Fluctuations in relativistic causal hydrodynamics

Nuclear Physics A, 2014

Formalism to calculate the hydrodynamic fluctuations by applying the Onsager theory to the relati... more Formalism to calculate the hydrodynamic fluctuations by applying the Onsager theory to the relativistic Navier-Stokes equation is already known. In this work, we calculate hydrodynamicfluctuations within the framework of the second order hydrodynamics of Müller, Israel and Stewart and its generalization to the third order. We have also calculated the fluctuations for several other causal hydrodynamical equations. We show that the form for the Onsager-coefficients and form of the correlation-functions remains same as those obtained by the relativistic Navier-Stokes equation and it does not depend on any specific model of hydrodynamics. Further we numerically investigate evolution of the correlation function using the one dimensional boost-invariant (Bjorken) flow. We compare the correlation functions obtained using the causal hydrodynamics with the correlation-function for the relativistic Navier-Stokes equation. We find that the qualitative behavior of the correlation-functions remain same for all the models of the causal hydrodynamics.

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Synthesis of Ni nanoparticles and their characterizations

Journal of Saudi Chemical Society, 2014

Ni nanoparticles were synthesized by solution reduction process successfully. The influence of pa... more Ni nanoparticles were synthesized by solution reduction process successfully. The influence of parameters on the size of Ni nanoparticles was studied and the referential process parameters were obtained. The morphology and structure of the synthesized Ni nanoparticles were characterized by transmission electron microscopy (TEM), powder X-ray diffraction (XRD), QELS data and infrared spectroscopy (IR). The result shows that Ni nanoparticles are of high purity and the average size of Ni nanoparticles was found to be 13 ± 2 nm.

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Synthesis of Al nanoparticles: Transmission electron microscopy, thermal and spectral studies

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012

Nanoparticles of Al(0) were synthesized by solution reduction process successfully. The influence... more Nanoparticles of Al(0) were synthesized by solution reduction process successfully. The influence of parameters on the size of Al(0) nanoparticles were studied and the referential process parameters were obtained. The morphology and structure of the synthesized Al(0) nanoparticles were characterized by Transmission Electron Microscopy (TEM), Powder X-ray Diffraction (XRD), Thermal Gravimetric Analysis (TGA), QELS Data and Infrared Spectroscopy (IR). The results show that nanoparticles of Al(0) are of high purity. XRD analysis revealed all relevant Bragg&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s reflection for crystal structure of Al metal. XRD spectrum also indicates there is no oxidation of Al(0) nanoparticles to aluminum oxide. TEM showed nearly uniform distribution of the particles in methanol and it was confirmed by QELS. Al(0) nanoparticles can be synthesized easily by reducing agent and are quite stable too.

Modulation of synthetic parameters of cobalt nanoparticles: TEM, EDS, spectral and thermal studies

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012

The study focuses on the modulation of synthetic parameters in order to influence the size, struc... more The study focuses on the modulation of synthetic parameters in order to influence the size, structure, composition and arrangement of nanoparticles of cobalt. Cobalt nanoparticles were synthesized by ethanolic solution of benzildiethylenetriamine in cobalt nitrate solution at 60 °C with stirring and refluxing leads to nanoparticles of cobalt. The morphology and structure of the synthesized nanoparticles of cobalt were characterized by Transmission Electron Microscopy (TEM), Powder X-ray Diffraction (XRD), Thermal Gravimetric Analysis (TGA), QELS Data and Infrared Spectroscopy (IR). Crystalline size was 20 nm determined from the sharp peak at 2θ=25 °C from the powder XRD. TEM images of cobalt nanoparticles without reducing agent having the diameter 20 nm with spherical shape and black color.

Novel thiocyanate ion-selective electrodes based on a copper(II) complex of p-hydroxyacetophenone thiosemicarbazone as a carrier

Monatshefte für Chemie - Chemical Monthly, 2013

A complex of copper(II) with p-hydroxyacetophenone thiosemicarbazone has been used to fabricate a... more A complex of copper(II) with p-hydroxyacetophenone thiosemicarbazone has been used to fabricate a polymeric membrane electrode (PME) and coated glassy carbon electrode (CGCE). The proposed electrodes showed excellent response characteristics to thiocyanate ions over a wide concentration range from 1.0 9 10 -7 to 1.0 9 10 -1 M for PME and 1.0 9 10 -6 to 1.0 9 10 -2 M for CGCE. Nernstian slopes exhibited were -59.7 ± 0.3 mV decade -1 for PME and -53.6 ± 0.4 mV decade -1 for CGCE with low detection limits of 4.3 9 10 -8 and 4.1 9 10 -7 M, respectively. The PME membrane electrode provides a more sensitive and stable device than the CGCE electrode. The PME has a wide functional pH range (2.5-10.5), fast response time (5 s), and could be used for approximately 4 months without any considerable divergence in the potential. The selectivity coefficient was determined by a matched potential method and fixed interference method. A good discriminating ability towards the SCN -ion compared to other anions has been observed. PME was successfully applied as an indicator electrode for potentiometric titration of thiocyanate ion with AgNO 3 . Further, the electrode was successfully applied to determine the thiocyanate content in physiological fluids (urine samples).

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Xerophthalmia In urban Slum Children Of Delhi

... 672, 1982. (Control of vitamin-A deficiency and xerophthalmia: report ofajoint WHO/UNICEF/ US... more

Control of Grid Integrated Photovoltaic system using new Variable Step Size Least Mean Square adaptive filter

Electrical Engineering, 2021

Voltage stability of grid integration for distributed energy resources

2016 7th India International Conference on Power Electronics (IICPE), 2016

To minimize the gap between supply and demand of electrical power for enhancing the reliability, ... more To minimize the gap between supply and demand of electrical power for enhancing the reliability, stability and quality of power in 21st century then there is need to upgrade convention power grid of 20th century to Smart Grid (SG) technology which comprises with information communication technology. Distributed Generation (DG) is one the best solution to minimize the gap because it is connected in distribution network which has negligible transmission loss and boost the power quality. This paper focuses on the different types of DG which is integrated to the existing grid. In this paper, three types of DG systems are considered i.e. solar energy, wind energy and fuel cell are integrated to the infinite bus using Matlab Simulation to verify the integrated system lie in stable region.

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