Subrata Kumar Aditya

• B. Sc.(Hons), M.Sc. Ph.D
• Professor at University of Dhaka

With the advent of a large number of small satellites in orbit performing critical missions, securing ground/space infrastructure against cyberattacks has become a blazing issue amongst operators and policymakers. In this paper, we provide up-to-date analysis on the recent advances, existing and future trends in small satellite cybersecurity, consi...

It is very expensive and time consuming process to establish a wireless system initially. A mathematical model has to be developed to establish such type of wireless system. It is very important to characterize the radio channel by the developed model. For this reason, the path loss and link budget calculation are needed. The coverage area has esti...

p>In this research paper, a hybrid power generation system considering Photovoltaic (PV), Wind Turbine and Diesel generator, has been proposed for a hilly region application. The method of this study was the assortment of the elementary data of wind speed, solar radiation and additional requisite input data. The electric renewable energy software h...

This research proposed a hybrid power generation system suitable for a hilly area application. The methodology of this research was the collection of the basic data of solar radiation, wind speed and other required input data. Optimization simulation model was developed using the electric renewable energy software hybrid optimization model of renew...

Worldwide Interoperability for Microwave Access (WiMAX) is an efficient technology for 20th century communication system. The technology provides broadband speed without the need for cables and is based on the IEEE 802.16 standard(also called Wireless MAN). Mobile WiMAX is defined as IEEE802.16e which is advanced and efficient technology for mobile...

In this paper cell range for different region and modulation schemes has been calculated for WiMAX and 3G mobile technologies, considering both as a cellular mobile technology. While resolving the cell range using different propagation models, effect of various parameters like frequency, base station antenna height, transmitting power, maximum allo...

In this study a simple statistical model has been used to estimate hourly solar global radiation over Bangladesh for two different time periods. Only the visible channel (0.63 m) data of NOAA-AVHRR digital images, obtained from Bangladesh Space Research and Remote Sensing Organization, has been processed to find the cloud index, a parameter which...

A good deal of ingenuity can be exercised and a vast amount of time wasted exploring layout topologies to minimize the size of a gate or other circuitry such as an adder or memory element in an integrated circuit. This paper represents a simple and compact layout design for two bit binary parallel ripple carry adder using only CMOS NAND gates with...

In this report, a hybrid power system has been designed considering photovoltaic, wind turbine generator and diesel generator. HOMER software has been used for analyzing the performance of the system. Different performance analysis like feasibility, sensitivity, cost, and sustainability has been done. Environmental and economic analysis is used to...

A satellite based method for the retrieval of earth’s surface reflectance has been presented. The method is applicable to tropical environment. Data from the advanced very high resolution radiometer (AVHRR) sensor carried by National Oceanic and Atmospheric Administration (NOAA) polar orbiter satellite of USA have been used for this study. Using th...

A grid-tied wind system may be as simple as wind turbine and a grid-tie inverter. Depending on the amount of power being used by the household, energy is either fed to or accepted from the utility. On the other hand, the pattern of wind blowing over Bangladesh, shows the peak windy season of a year coincides with the peak demand for electricity of...

Multilevel inverters have been attracting attention in recent years due to high power quality, high-voltage capability, low switching losses, and low EMC concerns. Hence a detailed work has been done on the design and performance study of a three-phase five-level imbricated cells PWM inverter. The heavy and bulky transformers that have been used in...

Renewable energies are the sources of power for sustainable development. ln this paper, studies have been carried out on sustainable power system sizing for a Base Transceiver Station (BTS) at Swandip with 0% capacity shoriage. A 25 years project of optimized Wind, Photovoltaic and battery hybrid micro power system has shown a net present cost of 6...

Multilevel inverters have been attracting attention in recent years due to high power quality, high-voltage capability, low switching losses, and low EMC concerns. Hence a detailed work has been done on the design and performance study of a three-phase five-level imbricated cells PWM inverter. The heavy and bulky transformers that have been used in...

Abstract—Terrestrial solar insolation measurement,is of fundamental,importance ,for ,the ,evaluation ,and deployment,of solar renewable,energy systems. Standard sophisticated,instruments ,like ,Pyranometer ,and Pyrheliometer,are ,not ,suitable ,for ,large-scale use because of high cost, poor commercial availability and need of specialized knowledge...

Hybrid energy system is an excellent solution for power generation in rural areas where the grid is infeasible. Such a system incorporates a combination of one or several energy sources such as solar PV, wind energy units, diesel generators etc. This study discusses various system components for remote area power supplies and then proceeds to an op...

Bangladesh is an energy deficit and low-economy country with high population density. Per-capita energy consumption is one of the lowest in the world. The only dependable indigenous gas, which is the major primary energy source in the country, is used mainly for the production of electricity and fertilizer. If it is burnt at an annual 10% growth ra...

Wind Atlas Analysis and Application Program (WAsP) is a powerful software package which is used for wind energy assessment for any location using the data of a nearby location under the same climatic condition. In this work WAsP has been used to predict potential areas of Kutubdia, an Island of Bangladesh, for installation of wind generators. As th...

In this paper, load frequency control (LFC) of a two area hydro-thermal system is studied. Optimum gain settings of proportional-integral (P-I), integral-derivative (I-D) and proportional-integral-derivative(P-I-D) controllers are obtained using genetic algorithm (GA) for two area hydro-thermal systems. A sketch of the genetic algorithm (GA) is pre...

This paper deals with load frequency control of an interconnected reheat thermal system considering battery energy storage (BES) system. Area control error (ACE) is used for the control of BES system. Time domain simulations are used to study the performance of the power system and BES system. Results reveal that BES meets sudden requirements of re...

This paper deals with load-frequency control of an interconnected hydro-thermal system considering battery energy storage (BES) system. A new area control error (ACEN) based on tie-power deviation, frequency deviation, time error and inadvertent interchange (unscheduled energy transfer) is used for the control of the BES system. Time domain simulat...

A battery energy storage system (BES) can provide fast active power compensation and hence it also can be used to improve the performance of the load frequency control. In this paper, the study is carried out on a single area model representing the whole power system considering generation rate constraint (GRC). An incremental model of BES is propo...

The paper presents dynamic system analysis of an isolated electric power system consisting of a diesel generator and a wind turbine generator. The 150 kW wind turbine generator is operated in parallel with a diesel generator to serve an average load of 350 kW. Time domain solutions are used to study the performance of the power system. Optimum valu...

The paper deals with some aspects of the interconnected operation of small-hydroelectric and diesel power systems provided with classical controllers. A comprehensive procedure for optimizing the integral controller gain setting using an integral squared error (ISE) technique is suggested. Analysis reveals that the integral-derivative (ID) controll...

A low power battery type static inverter has been designed and fabricated for photovoltaic systems. The inverter system having three-way single phase supply each of 1000 W, 220 W, 50 Hz output has been driven by a 24 V lead add battery. The inverter can also be used as a three-phase supply each of 120° phase difference from its three outputs. In th...

In this paper an iterative technique for sequential mobile power updates in 3G WCDMA networks based on Relaxation Method has been presented. The obtained algorithm is distributed and has the same complexity as the popular DPC (distributed power control) algorithm, which is based on Gauss-Seidel iterations, and which assumes simultaneous power updat...