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 & Electric power system. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

A hybrid fuel cell-supercapacitor system employing adaptive control to overcome fuel starvation phenomenon of fuel cell

Abstract: Increase in research orientation in the field of structure and control of microgrids play a major role in seamless inclusion of clean energy into microgrids to suffice the conventional energy requirements. This paper presents a low voltage DC microgrid incorporating fuel cell based reliable clean energy generation and supercapacitor based transient energy storage device to form a stiff DC source for the local DC loads. Fuel cell stack and supercapacitor bank are interfaced to load terminals using a DC-DC boost converter and DC-DC bidirectional converter respectively. Dual loop control is used to establish control for these power electronic interfaces in order to facilitate stable power to the load irrespective of the constrained operating characteristics of the fuel cell and transient load variations. Proper power sharing, safe operation of the equipment and optimal control of state variables is achieved by employing the current control. A special case of SOC protection of supercapacitor is dealt in this paper. The proposed system along with the controller is tested for different transient R, R-L loads operating in an intermittent mode using MATLAB/SIMULINK modelling. The aftermath of the associated control action is a stabilized grid voltage (48V) with required power flow among microgrid participants in order to suffice the transient power requirements of the grid loads even after respecting the operating constraints associated with the microgrid participants.

Design and Implementation of Multi-operand 2$$^$$, 2$$^n$$n, and 2$$^n+1$$n+1 Modulo Set Adder

Abstract: In this paper, multi-operand modulo adders have been proposed and the adders have been designed based on a new 5:3 compressor. Gate-level design of such compressor has been carried out through the simplification of the K-map. The functionalities of the proposed modulo adders have been verified in the Xilinx 14.7 design environment implemented through VHDL coding. The performance parameters such as power consumption, delay, and power-delay product (PDP) have been obtained from the simulation using the device Virtex-6.

A Low Voltage Ride Through Scheme for three phase grid connected PV inverter with an adaptive window based MAF-PLL

Abstract: Balancing the rift between demand and production of energy has become one of the major growing concerns globally. This has prompted the technocrats, policy-makers, etc. to contemplate on the potency of renewable energy (RES) sources. The outcome has resulted in the world-wide adoption of RES to meet energy deficits. However various grid codes govern their integration to the grid. These monitor the functioning of the RES power converters and impose active and reactive power injection requirements. This is termed as the low voltage ride-through capability of the power converters in order to ensure unnecessary tripping of the interfacing converter resulting in sudden demand-shift on the conventional sources. Cascaded failures and blackouts could be an immediate result. Furthermore proper, fast and dynamic tracking and synchronization of the grid angle also emerges as a necessity in order to respond to the scenario of sudden grid disconnection. But the vulnerability of the grid-interfacing converters to disconnection due to grid voltage and frequency distortions contributes to the fragile interconnection. Taking into consideration all the discussed issues the need for a control law accounting for synchronization and grid distortions emerges as a foreseeable solution. This paper investigates the functioning of adaptive window-based MAF-PLL and the operation of an LVRT scheme for low voltage interfaced PV inverters. Extensive simulations in MATLAB/Simulink have been investigated under different scenarios to validate the proposed scheme.

A nearest neighbor quantum cost metric for the reversible circuit level

Abstract: Motivated by the prospects of quantum computation, the design of quantum circuits received significant attention in the recent past. Due to the complex representation of the underlying quantum mechanical phenomena, a two-stage design flow was established in which the desired functionality is first realized in terms of a reversible circuit and, afterwards, mapped into an equivalent quantum circuit. This paper proposes a new metric for estimating nearest neighbor cost at the reversible circuit level. Research works are mostly carried out considering nearest neighbor constraints at the quantum circuit level. Various quantum gate libraries and mapping schemes have been reported in the literature to realize the circuit operation at quantum level. One such mapping scheme exploiting a well established quantum gate library (NCV) is explored in defining the cost metric. Experimental evaluations confirmed both the accuracy as well as the applicability of the proposed metric.