National Institute of Technology, Meghalaya

About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Computer science. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

HIL based Coordinated Control of grid interfaced Distributed Generation assisted Battery Swapping Station

Abstract: The large-scale world-wide adoption of Electric Vehicles as a mode of transportation is predicted to create stress on the already loaded power supply network. As such continued efforts in the area of distributed generation assisted charging stations are in full-swing. The paper investigates the outcomes of utilizing a PV assisted Battery Swapping Station to combat and alleviate simultaneously the issues of overburden and energy storage. A BSS can be tethered not only to provide battery swapping services to EVs but also provide for grid support, energy storage, ancillary services, etc. A grid interfaced PV assisted BSS system and its functioning in the smart grid environment has been proposed considering the system has a reliable and secure communication infrastructure. The multiple roles of the BSS and its coordinated functioning with the PV and the grid is examined under various test scenarios. The hardware prototyping of the control strategies for the inverter and the BSS is realized using Virtex-6 FPGA ML605 evaluation kit. The simulation and the hardware co-simulation results are presented to validate the efficacy of the proposed control scheme.

Design and development of closed loop model of an adjustable speed Permanent Magnet Synchronous Motor drive using PI controller

Abstract: This paper deals with the development of closed loop model of an adjustable speed Permanent Magnet Synchronous Motor (PMSM) drive fed from a voltage source inverter operating under 180° conduction mode, self synchronized with the rotor position information is represented. An automated closed loop adjustable speed PMSM drive can be achieved by employing a speed controller, to which the information about the reference speed and actual speed should be available. The incorporation of Sinusoidal Pulse Width Modulation (SPWM) strategy establishes near sinusoidal armature phase currents and comparatively less torque ripples without sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the information about reference speed is provided to a speed controller, to ensure that actual drive speed tracks the reference speed with ideally zero steady state speed error. Design of the speed controller and current controller will be incorporated in order to achieve the desired performance of the closed loop model of PMSM drive accordingly. Therefore classical PI controller is chosen for such a closed loop adjustable speed PMSM drive for the performance optimization.

Computational Analysis of Internally Grooved Absorber Tubes of Parabolic Trough Solar Collector for Constant Mass Flow Rate of the Heat Transfer Fluid

Abstract: This work represents the study of four different types of absorber tubes having helical grooves. The length of the tube is 2 m, with an external and internal diameter of 25 and 19 mm, respectively. The absorber tube is analysed considering constant mass flow rate of 0.0318 kg/s. 818.5 W/m2 of constant heat flux is supplied at the lower outer surface of the tube that is facing towards the parabolic trough reflector. ANSYS FLUENT 18.0 is used for simulation which is based on finite volume method. Simulation is performed using a turbulence model of standard k-ɛ RNG type. Thermo hydraulic performances for trapezoidal, rectangular, semicircular, and triangular grooves are calculated as 0.64, 1.47, 1.56, and 2.10, respectively. Therefore, the absorber tube with triangular groove showed better thermal performance compared to others. As well as the drop of pressure for the same tube is also lowest among the other ones.

Convergence of Generalized SOR, Jacobi and Gauss–Seidel Methods for Linear Systems

Abstract: In this paper, we study the convergence of generalized Jacobi and generalized Gauss–Seidel methods for solving linear systems with symmetric positive definite matrix, L-matrix and H-matrix as co-efficient matrix. A generalization of successive overrelaxation (SOR) method for solving linear systems is proposed and convergence of the proposed method is presented for linear systems with strictly diagonally dominant matrices, symmetric positive definite matrices, M-matrices, L-matrices and for H-matrices. Finally, numerical experiments are carried out to establish the advantages of generalized SOR method over generalized Jacobi, generalized Gauss–Seidel, and SOR methods.