School of Electrical Systems Engineering (FYP)http://dspace.unimap.edu.my:80/xmlui/handle/123456789/34902024-03-28T18:05:10Z2024-03-28T18:05:10ZStudy of doubly fed induction generator using wound rotor induction machine for wind turbineNur Atteya, Azmihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/403512015-07-26T04:36:23Z2011-05-01T00:00:00ZStudy of doubly fed induction generator using wound rotor induction machine for wind turbine
Nur Atteya, Azmi
In 1990s, wind power turbines were characterized by a fixed speed operation.
Basically, they consisted of the coupling of a wind turbine, a gearbox and an induction
machine directly connected to the grid. Wind energy has become one of the most
important and promising sources of renewable energy that demands additional
transmission capacity and better means of maintaining system reliability. In order to
meet the power needs, taking into account economical and environmental factors, wind
energy conversion is gradually gaining interest as a suitable source of renewable energy. The electromagnetic conversion is usually achieved by induction machines or
synchronous and permanent magnet generators. In order to enable variable speed
operations with a lower rated power converter, Doubly-Fed Induction Generator (DFIG)
is suitable and can be used. The stator is directly connected to the grid and the rotor is
fed to magnetize the machine. These wind energy conversion systems are connected to
the grid through Voltage Sources Converter (VSC) to make variable speed operation
possible. The studied system here is a variable speed wind generation system based on
DFIG. This project concentrates on the comparison between the used of DFIG and other
generating systems that applied in wind power generating systems, such as Permanent
Magnet Synchronous Generator (PMSG). There are many advantages of DFIG
compared to the other two generators in many facets. However, all kinds of generating
have their own merits and demerits of their features itself. The PSCAD software is used
for the simulations.
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2011-05-01T00:00:00ZFuzzy versus PID control of an inverted pendulumNur Amalina, Abu Bakarhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/403502015-07-26T04:29:10Z2011-06-01T00:00:00ZFuzzy versus PID control of an inverted pendulum
Nur Amalina, Abu Bakar
Nowadays, modern control system engineering is a very important field in industrial
and automation system. Control systems give many contributions in the advance of
engineering field today. The paradigmatic inverted pendulum problem is one of the most
important and favorite topics for control system enthusiasts. This inverted pendulum
represents a challenging control problem, which continually moves towards an uncontrolled state. The inverted pendulum inherently unstable and must be actively balanced in order to remain upright. This paper presents the simulation study of several control strategy delivers better performance with respect to pendulum’s angle and cart’s position .Two controller are presented such as Proportional-Integral-Derivate (PID) for controlling the linear system of inverted pendulum and Fuzzy Logic Controller (FLC) for controlling the non-linear system of inverted pendulum model. Simulation study has been done in Simulink shows that FLC produced better response compared to PID control strategies and offers considerable
robustness.
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2011-06-01T00:00:00ZA case study on modelling and design a linear generator (The principle of wave energy plant)Nur Aainaa Kamilah, Saidhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/403492015-07-26T04:25:32Z2011-05-01T00:00:00ZA case study on modelling and design a linear generator (The principle of wave energy plant)
Nur Aainaa Kamilah, Said
Ocean wave energy is an emerging kind of renewable energy and has already been
exploited on a small scale. Some technologies are being developed to exploit the large
potential of this energy source. One of the main advantages of ocean waves as a
resource for electrical energy production is because of its high energy density. Several
methods have been proposed for the conversion of ocean wave mechanical energy into
electrical energy. One of such method consists in the use of a direct drive linear
generator enclosed inside a floating element; connect a buoy to a linear generator. The
generator is driven by a mass-spring system, which oscillates due to the ocean wave
movement. In this thesis are presented the previous studies, development and further
research about this system. The thesis starts with a review of ocean wave as an
alternative energy and wave energy conversion system, indicating that the different
wave energy conversion systems that have been presented in previous studies with
different generator systems. The simulation is also conducted to obtain the output power
result based on the data collected by using Matlab software. The thesis concludes with
several concepts and characteristics to design linear generator in order to improve its
working efficiency.
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2011-05-01T00:00:00ZA comparative study on suitable high voltage sources for ozone generationNorhasimah, Zainal Abidinhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/403482015-07-26T04:21:09Z2011-05-01T00:00:00ZA comparative study on suitable high voltage sources for ozone generation
Norhasimah, Zainal Abidin
This research is about a comparative study on ozone generation via the use of
various high voltage sources in various methods to improve efficiency and also focus on
the concentration level of ozone generation. Ozone is widely as oxidising agents that
can decolourization, elimination of taste and odours, degradation of organics and
disinfection. Ozone can be generated by lightning phenomena in nature and it can also
be generated from corona discharge from strong electric field. The best methods to
generated ozone by using dielectric barrier discharge of a coaxial concentric electrode
system with solid dielectric layer. The higher peak voltage that applies on this method is
62 kV in Type IIPa reactors that produce 8400 part per million, ppm of ozone at 50
pulse repetition rates, pps compare the other method. In this research, the concentration
of ozone actually can increase with other parameter like the flow rates should be lower
during this process, the resident time and temperature must be decreased and lastly the
gap discharge and frequency must in increased position. The efficiency of ozone
generation can increase when the residence time, temperature and gap discharge must
be decreased. All the characteristics actually satisfy for an industrial application that
needs more concentration of ozone gas and the higher efficiency of ozone that give
reasonable power consumption.
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2011-05-01T00:00:00Z