Alimul Khan | Bangladesh University (original) (raw)

Papers by Alimul Khan

This paper describes the available topologies for electricity generation and its evacuation syste... more This paper describes the available topologies for electricity generation and its evacuation system in Bangladesh.
Usually, electricity is generated in a large power station and it is then sent to the customer end by means of transmission and
distribution system. This is an established technology. However, this system proves very costly and the cost increases
especially when the service area is remote. In remote areas, local people use kerosene as a fuel for lighting. Also, diesel
generators for electrifying local markets and villages are being used. However, these generators run for a few hours of the day
and the generation cost becomes very high. Practice of battery charging based electricity system is also found in many places
of the remote area. Besides these, Government of Bangladesh (GOB) is trying to electrify the remote areas by means of SHS,
which has been being used to replace the traditional kerosene-based lamps from 1998 in Bangladesh. However, with the
advancement of technology, the demand of present SHS consumers is increasing considerably. Electricity to all is an essential
requirement for the proper development of Bangladesh. Thus, it is essential to supply power with quality and reliability to the
present users of the national grid, customers of the SHS and people of the un-electrified region. With this context, possibilities of exploring new topologies of generation and evacuation have also been discussed in this paper.

This paper is mainly addressing the design and analysis of a DC micro grid power system in a remo... more This paper is mainly addressing the design and analysis of a DC micro grid power system in a remote area in Bangladesh. Generation of
electricity is not enough to serve its demand. Majority of the islands and the rustic communities are deprived from electricity and most of them are relying
on some fossil fuels for searching their required energy. The cost of fuels is high and for this reason the cost of expected generating power is increased
tremendously in rustic areas. By burning fossil fuels, increasing carbon dioxide (CO2) is rocketed into the atmosphere. It has raised national and
international concern and efforts to develop alternative renewable sources of primary energy such as solar, biomass, wind, hydro and other green power
technologies are being used to provide sustainable, affordable and comfortable sources of energy. In Bangladesh Solar Home System (SHS) has
reached a great number of installations by the effective programs run by Infrastructure Development Company Limited (IDCOL) which has been started
about 12 years ago. SHS is popular when it replacesany lamp run by kerosene or wax. However, demand of customer increases day by day and old
customers as well as new customers is searching a bigger power source than as in SHS. As a result it cannot meet the increased demand of customers
with an affordable price. This paper also aimed to mention how to serve the increased demand of a customer with an affordable price by means of DC
micro grid system.

The radioactive effect of nuclear power plants in accidental cases as well as carbon emission imp... more The radioactive effect of nuclear power plants in accidental cases as well as carbon emission impact of fossil fuels
have forced many countries to explore clean energy sources that are environmentally more suitable. As Bangladesh do not
have good prospect in fuel cell, geothermal, tidal or wave resources, wind energy is an influential energy source in
accordance with solar and biomass. In this paper, based on a2-parameter Weibull analysis method, wind characteristics and
assessment of wind energy potential has been analyzed using the wind speed data of the period 2002 -2011 at 10 m height of
Cox’s Bazar, the longest sea-beach located at the southeast of Bangladesh. From the calculation, it has been found that the
monthly mean wind speed is ranged from 2.17 m/s in November to 2.90 m/s in April, the monthly values of the Weibull
shape parameter (k) is ranged from 4.73 to 9.24, while the value of scale parameter (c) is ranged from 2.50 to 2.98 m/s and
the monthly wind power density is ranged from 7.30 to 17.14 W/m
2
. The seasonal mean wind speed has been found to be
oscillated between 2.31 and 2.78 m/s, while the wind power density is ranged from 8.48 W/m
2
to 14.29 W/m
2
for autumn and
spring, respectively. The results presented in this paper will be helpful to assess the feasibility of installing wind turbin e in
the subjected area.

A humanoid robotics is a new challenging field. To co-operate with human beings, hum... more A humanoid robotics is a new challenging field. To co-operate with human beings, humanoid
robots not only have to feature human like form and structure, but more importantly, they must prepared human
like behavior regarding the motion, communication and intelligence. The model number of this beginner is ASR
K-250. This paper we consider the mechanism and mechanical structure of ASR K-250 (Beginner) and its
implementation.

This paper represents the first application of Long-Range Energy Alternative Planning (LEAP) sof... more This paper represents the first application of Long-Range Energy Alternative Planning
(LEAP) software in energy forecasting of gas sector in Bangladesh. LEAP is used to take
government decisions in many developed countries. In this work, at first the data on amount of
gas consumption in different sectors of Bangladesh have been collected from year 1993 up-to
year 2007. Then using ‘Linear’ and ‘Exponential’ time series wizard, gas consumption of these
sectors has been forecasted up-to year 2020. Comparison between the results of forecasted
data using aforementioned two time-series wizards have been discussed. The most acceptable
forecasting model and why it wasn’t used in this work have also been discussed thoroughly.

In this study, a baseline survey was carried out to clarify current situation of renewable energy... more In this study, a baseline survey was carried out to
clarify current situation of renewable energy in Bangladesh.
All the information has been collected by inventory survey for
120 Solar Home System (SHS) users and private sectors
including NGOs which are working on PV or Biogas. 14
villages of 6 districts (Pabna, Natore, Bogra, Sirajgonj,
Barisal& Jhalkathi) have been covered through-out the whole
study. Financial support of this survey has been provided by
Nippon Koei, Japan & JICA (Japan International Cooperation Agency) provided all kinds of technical support. The
study represents a real time reflection of the general people
opinion on the payment scheme of PV systems provided to
them.

The aim of this paper is to find the optimum tilt angle of solar PV panel at which the yearly de... more The aim of this paper is to find the optimum tilt
angle of solar PV panel at which the yearly demand would be
met maximum. Solar PV is one of the most widely used
renewable energy resources. The output of a panel is highest
when the incident ray is perpendicular to the panel plane. Due
to variations in the locus of the sun over the year, the alignment
of the panel should be changed according to the sun position for
maximum generation. However, changing the tilt angle needs
single axis tracker or double axes tracker which is costly and
also needs maintenance; thus may not be suitable. Therefore, the
panel is kept at the average tilt of year at which the ray is
perpendicular for the maximum time. This may be termed as
the default tilt angle. The generation of solar panel varies over
the year providing maximum generation at the default tilt angle.
Similarly, the consumption of an area is also varies over the
year. The amount of generation may not proportional as the
demand, thus it results surplus or shortage. For an isolated area,
it is hardly possible to use surplus energy considering certain
demand profile. Even, it is not possible to store the surplus
energy of a season to any device for long time to use it for
another season. However, the surplus energy of a season may be
shifted to the shortage season by changing the tilt angle.
Different tilt angle will provide different pattern of generation
over the year. The generation at optimum tilt angle will not
maximize the generation of energy over the year rather it will
maximize the demand met by shifting the energy to shortage
season from surplus season. A new concept to maximize the
energy usage from solar PV by changing the tilt angle and thus
minimize the shortage to meet the demand of an isolated power system is also introduced here.

This paper is mainly addressing the design and analysis of a hybrid Solar and Bioma... more This paper is mainly addressing the design and
analysis of a hybrid Solar and Biomass System for rural
electrification in a remote area in Bangladesh by Decentralized
Generation & Rural Power Distribution Management. Energy is
crucial input in the process of economic, social and industrial
development. Energy plays a vital role in our daily life. However,
the conventional source of energy to produce electricity is
decreasing day by day significantly. In this regards
nonconventional or renewable energy resources such as bioenergy, Solar, Wind, Ocean and Geothermal are taking this
challenge. A large proportion of the world’s population live in
remote rural areas and far away from grid. The installation and
distribution costs are considerably higher for remote areas.
Moreover, there is greater transmission line losses and poor
supply reliability. That’s why, there is growing interest in
harnessing renewable energy sources since they are available in
abundance, pollution free and inexhaustible. Not only that, the
combination of technologies, meaning hybrid technology,
provides interesting opportunities to overcome certain technical
limitations and to mitigate fuel price increases, deliver operating
cost reductions, and offer higher service quality than traditional
single-source generation systems. A hybrid system is a dynamic system that exhibits both continuous and discrete dynamic behaviour – a system that can both flow and jump.

This paper explores the idea and analysis of a DC micro grid which have several types of ... more This paper explores the idea and analysis of a DC
micro grid which have several types of renewable energy
resources as well as traditional fuel based resources for remote
area of Bangladesh. Most of the remote areas of Bangladesh is
deprive from the benefit of using electricity due to lack of
enough transmission and distribution line. Moreover the
Generation of electricity is not enough to serve its demand. For
various factors, national and international concern has been
raised to develop alternative renewable sources of primary
energy such as solar, biomass, wind, hydro and other green
power technologies are being used to provide sustainable and
affordable sources of energy. Government is trying to solve this
problem by means of several renewable energy activities.
Microgrid is one of them. Analysis of DC microgrid is important
as an AC microgrid. The grid may have multiple types of energy
resources. This paper also aimed to mention how to manage the resources used in a DC micro grid system.

Bangladesh has a projected electricity demand of 10283 MW by the end of the year 2015. Despite ha... more Bangladesh has a projected electricity demand of 10283 MW by the end of the year 2015. Despite having huge coastline and relatively large area only 100 MW of that huge demand is projected to come from wind power sources. Bulk of this generation is planned to be deployed in the coastal area and adjacent islands. But there are other places of interest for wind power generation, which could be a good means for solving the huge power crisis in Bangladesh. In this paper, feasibility of different scale of wind power generation in 35 different places is studied in the perspective of Wind Power Density (WPD) and Plant Capacity Factor (PCF) at different turbine heights. Only 5 of those sites attain power class 2 or more at 50m height and 17 of them are projected to achieve a PCF of 20% or greater for micro scale generation. At 120m height only 5 sites are projected to attain a much larger WPD and achieve a power class of 2 or more and remaining 30 places still belong to power class 1. Feasibility of deploying large scale wind turbine at Chittagong and Jessore, medium scale at Khepupara, and small scale at Cox's Bazar and Hatiya is studied. All 5 sites attain a PCF of 26% or more which reinforces the feasibility of deploying different scale of wind turbine at those sites.