Fault Immune Pico-Hydro Powered Base Station of Remote Telecommunication Tower

Verma, Vishal,Pant, Peeyush,Singh, Bhim The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4

This paper presents the dynamic excitation control of a siphon-turbine coupled pico-hydro powered cage rotor induction generator and load matching for off-grid electricity generation. Through the proposed dual-role of the current-controlled voltage source converter (VSC), acting as static synchronous compensator and load controller, real and reactive power are dynamically controlled in a decoupled manner with a self supported DC-bus. The proposed scheme entails minimal computation for ensuring the rated (set) capacity of real power. The scheme also exhibits fault immunity for protection, thus enabling the effective handling of constant power electrical loads presented by base telecom station towers in remote locations. The performance of the system is evaluated under MATLAB/Simulink and is experimented through a developed hardware prototype. Simulation and experimental results show close conformity and validate the effectiveness of the proposed scheme.

Fault Immune Pico-Hydro Powered Base Station of Remote Telecommunication Tower

Vishal Verma,Peeyush Pant,Bhim Singh 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4

This paper presents the dynamic excitation control of a siphon-turbine coupled pico-hydro powered cage rotor induction generator and load matching for off-grid electricity generation. Through the proposed dual-role of the current-controlled voltage source converter (VSC), acting as static synchronous compensator and load controller, real and reactive power are dynamically controlled in a decoupled manner with a self supported DC-bus. The proposed scheme entails minimal computation for ensuring the rated (set) capacity of real power. The scheme also exhibits fault immunity for protection, thus enabling the effective handling of constant power electrical loads presented by base telecom station towers in remote locations. The performance of the system is evaluated under MATLAB/Simulink and is experimented through a developed hardware prototype. Simulation and experimental results show close conformity and validate the effectiveness of the proposed scheme.

Design and Implementation of Router for NOC on FPGA

Gaurav Verma,Harsh Agarwal,Shreya Singh,Shaheem Nighat Khanam,Prateek Kumar Gupta,Vishal Jain 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12

In today’s technological era, SOC has undergone rapid evolution and is still processing at a swift pace. But due to this explosive evolution of semiconductor industry, the devices are scaling down at a rapid rate and hence, SOC today have become communication-centric. However, the existing bus architectures comprising of wires for global interconnection in SOC design are undergoing design crises as they are not able to keep up with the rate of scaling down of devices. To overcome bottleneck of communication system, NOC is an upcoming archetype. In on-chip network, router is considered as an important component. This paper proposes router, its components and parameters which affects the entire design. Thus, to validate the functioning of NOC on hardware, router has been designed in VHDL and simulated in Xilinx ISE 14.1 targeting Xilinx XC5VLX30-3 FPGA.

What can be the role of Ayurveda in Health Education: An Overview.

Gupta, Vishal,Verma, Vandana Cellmed Orthocellular Medicine and Pharmaceutical 2020 셀메드 (CellMed) Vol.10 No.1

In the present highly changing era, every dimension from Technology to Education, Environment to Sanitation and from Agriculture to our Food basket is getting changed. Our experiences say that the most affected ethnic group from this rapidly changing pattern of our food intake, lifestyle are our adolescent. This is also a fact that our adolescent passes their 2/3 of time of a day in their schools. In this regard our school system needs to formulate their comprehensive approach to Health for our adolescents. On other hand Ayurveda, the ancient Indian system of Medicine had expressed views on a concept of Holistic Health thousand years ago. This research article is an attempt of borrowing this valuable concept from Ayurveda and suggesting to introduce them into our comprehensive school health programme such as concept of wellness, quality of life, Holistic Health and measures related to diet and lifestyle for preservation, promotion of health and prevention of disorders etc. This manuscript also evaluates the existing approaches of school health programmes towards current scenario. Now a day's our food habits, dietary intake and the life style are not at the level of satisfactory condition this lead to early onset of metabolic chronic disorder especially in our adolescents because on the basis of age-immunity relationship they are easily targeted. The chronic metabolic disorders results into overweight, obesity, anxiety, mental trauma, distress, over- fatigued, incapable for physical work, getting tired soon. This article provides a space to rethink and reformulate our school health programmes in light of our ancient tradition of medicine.

Bi‑directional non‑isolated impedance converter for extra low‑voltage battery system safety

Aditya Narula,Vishal Verma 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.8

For bi-directional power converters, modularity, low leakage currents, low ripple, and a simple bi-directional control that utilizes storage eff ectively with low-voltage stress are required. This paper proposes a new configuration for converters that meet all of the above requirements to realize a robust converter for both vehicle to low-voltage DC microgrid (V2G) and low-voltage DC microgrid (LVDC-MG) to vehicle (G2V) technologies. The proposed power-dense modular-impedance source configuration employs coupled inductors, which ensures a power-dense modular architecture configuration with low current ripple and negligible leakage currents. The new auxiliary boost capability of the impedance source provides a wide operating range. A unifi ed bi-directional control algorithm enables operation to/from battery stacks at customized rates, based on the state of charge (SoC). Based on the requirements of the control scheme, this automatically invokes the use of the impedance network to cater to the low charge conditions of the battery stack or the transient conditions on the LVDC microgrid. The proposed bi-directional converter is tested through both simulations and experimental studies on a developed prototype to confirm high efficiency operations over a wide range of duty cycles.

PV fed front‑end isolated voltage multiplier converter for off grid EV charging infrastructure

Shirish Raizada,Vishal Verma 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9

A novel current fed isolated voltage multiplier converter (IVMC) exhibiting fast dynamics and high efficiency with seamless interfacing of low voltage PV panel with a high voltage DC bus is presented in the paper. The proposed converterexhibits interleaving for a quantifiable reduction in the input current ripple and input filter size while ensuring the superior performance of the maximum power point tracking (MPPT) controller. The low turn ratio of the high-frequency transformer incorporated into the IVMC allows for galvanic isolation along with lower leakage inductance. The distributed architecture of the IVMC facilitates a reduction in the voltage ripple across the multiplier capacitors and proportionally distributes the voltage gain among the different stages. Furthermore, it creates parallel conduction paths, which reduces the conduction losses in the devices and magnetic components. The scalability and modularity of the IVMC make it suitable for front-end PV applications where multiple front-end converters are interfaced to an intermediate DC bus for EV charging infrastructure. The performance of a hardware prototype of a PV fed IVMC under insolation variation is investigated through the MATLAB simulation environment and validated experimentally.

Front-End Current-Fed High Gain Isolated Converter with Flexible Power Point Tracking for Floating PV System

Raizada Shirish,Verma Vishal 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1

Conventionally, a foating PV (FPV) system sufers from high intermittency and utilizes string PV and centralized bulky converters with complex maintenance and low reliability. The paper investigates the suitability of the proposed current-fed high gain isolated converter (CF-HGIC) as a module integrated converter (MIC) in the FPV system as MIC exhibits higher robustness, reliability, and simple maintenance. The novelty of the paper is the unique architecture of CF-HGIC which alleviates leakage currents and mitigates intermodular circulating currents while achieving high gain at high efciency with low input current ripple. Furthermore, the proposed fexible power point tracking algorithm with constant power generation capability for the FPV system mitigates the intermittency and supports the battery storage system and can be easily implemented on low-cost controllers. The proposed front-end section of the module integrated FPV system with multiple modules of FPV fed CF-HGIC also demonstrates independent operation during a module outage. The simulated performance of a 1 kW system incorporating 4 modules is evaluated in MATLAB simulated environment for uniform variation in solar insolation and a module outage. Furthermore, the 212.5 W system incorporating a single module is validated experimentally under uniform insolation variations. The algorithm is implemented on the dsPIC33FJ16GS502 controller.

Bismuth zinc borate- Polyacrylonitrile nanofibers for photo-piezocatalysis

Chirag Porwal,Sahil Verma,Vishal Singh Chauhan,Rahul Vaish 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-

This study investigates the use of an electrospun membrane composed of Bi2ZnB2O7 - Polyacrylonitrile(BBZO-PAN) for the degradation of Methylene blue (MB) dye. The membrane was fabricated using theelectrospinning technique, and its structural and morphological properties were analyzed using X-raydiffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy(FE-SEM), and high-resolution transmission electron microscopy (HR-TEM). The membrane’schemical states before and after encapsulation of BBZO in PAN matrix were analyzed using X-ray photoemissionspectroscopy (XPS). The optical studies revealed that the band gap of the BBZO-PAN membranewas 2.92 eV, which is lower than that of the PAN membrane (4.06 eV), due to the presence of BBZO in thePAN matrix. The prepared membrane demonstrated the capability to degrade dye under visible light irradiationvia photocatalysis, piezocatalysis, and photo-piezocatalysis. The highest achieved degradationand kinetic rate constant were 82% and 8.8*10-3 min1, respectively. The active species responsible fordegradation were identified using scavenger tests for all catalytic processes. These results demonstratethe potential of the BBZO-PAN membrane for use in wastewater treatment and other environmentalapplications.

Deformity Correction with Interbody Fusion Using Lateral versus Posterior Approach in Adult Degenerative Scoliosis: A Systematic Review and Observational Meta-analysis

Mittal Samarth,Sudhakar Pudipeddi Venkata,Ahuja Kaustubh,Ifthekar Syed,Yadav Gagandeep,Sinha Shivendra,Goyal Nikhil,Verma Vishal,Sarkar Bhaskar,Kandwal Pankaj 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2

This study was designed to systematically review and meta-analyze the functional and radiological outcomes between lateral and posterior approaches in adult degenerative scoliosis (ADS). Both lateral (lumbar, extreme, and oblique) and posterior interbody fusion (posterior lumbar and transforaminal) are used for deformity correction in patients with ADS with unclear comparison in this cohort of patients in the existing literature. A literature search using three electronic databases was performed to identify studies that reported outcomes of lateral (group L) and posterior interbody fusion (group P) in patients with ADS with curves of 10°–40°. Group P was further subdivided into minimally invasive surgery (MIS-P) and open posterior (Op-P) subgroups. Data on functional, radiological, and operative outcomes, length of hospital stay (LOHS), fusion rates, and complications were extracted and meta-analyzed using the random-effects model. A total of 18 studies (732 patients) met the inclusion criteria. No significant difference was found in functional and radiological outcomes between the two groups on data pooling. Total operative time in the MIS-P subgroup was less than that of group L (233.86 minutes vs. 401 minutes, p <0.05). The total blood loss in group L was less than that in the Op-P subgroup(477 mL vs. 1,325.6 mL, p <0.05). Group L had significantly less LOHS than the Op-P subgroup (4.15 days vs. 13.5 days, p <0.05). No significant difference was seen in fusion rates, but complications were seen except for transient sensorimotor weakness (group L: 24.3%, group P: 5.6%; p <0.05). Complications, such as postoperative thigh pain (7.7%), visceral injuries (2%), and retrograde ejaculation (3.7%), were seen only in group L while adjacent segment degeneration was seen only in group P (8.6%). Lateral approach has an advantage in blood loss and LOHS over the Op-P subgroup. The MIS-P subgroup has less operative time than group L, but with comparable blood loss and LOHS. No significant difference was found in functional, radiological, fusion rates, pseudoarthrosis, and complications, except for transient sensorimotor deficits. Few complications were approach-specific in each group.