Department of Electrical Engineering

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https://escholar.umt.edu.pk/handle/123456789/1175
The mission of the electrical engineering program is to prepare its graduates for successful professional engineering careers by providing electrical engineering capabilities necessary to engage in service, research and development that serve the needs of their homeland Pakistan as well as the other parts of the globe.

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Browsing Department of Electrical Engineering by Author "Asif Hussain"

Now showing 1 - 3 of 3
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    Forward fly-back voltage balancing circuit for series connected super capacitors using digital control
    (International Conference on Renewable Energy Research and Applications, 2013) Asif Hussain; Muhammad Basit Shahab
    Supercapacitor is an electrical energy storage device which offers remarkably high energy density when compared to conventional capacitors and high power density when compared to batteries. While using the supercapacitors for energy storage, the main disadvantage is their limited voltage due to contemporary technology restrictions. Therefore, for higher voltage operation supercapacitors are connected in series to achieve the appropriate voltage level. Because of the difference in the magnitude of capacitance of cells, local over-voltage appears on one or more supercapacitor cells. This over-voltage decreases the lifetime and energy storage efficiency of the associated cell, which can be improved considerably by balancing the voltages across each supercapacitor. This paper presents an active voltage balancing approach using a forward fly-back power converter. In the proposed balancing scheme, cell with the higher voltage is selected to extract the extra energy and then a proportion of this extracted energy is distributed to other supercapacitors via the proposed circuit. The feasibility of the proposed balancing scheme has been verified by computer simulation and experimental results.
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    Smart grid architecture and communication using heterogeneous communication techniques in different tiers
    ((POWERENG), Turkey, Istanbul., 2013) Waqas Tariq Toor; Muhammad Basit Shahab; Muhammad Shoaib; Asif Hussain; Mashood Nasir
    This paper discusses different communication techniques in different tiers of architecture of smart grid. Communication is what differentiates between conventional and smart grids. Existing communication techniques can be used for the communication among different grids. Each communication technique has some pros and cons. If same communication technology is used for the whole network, it may be advantageous in certain scenario or tier but may not be beneficial in other tiers. This paper presents the idea of using different communication techniques for different tiers. The main objective is to use the advantage of a communication technique in a certain tier without bearing its disadvantage in any other tier. Different topologies of grid connectivity are discussed and communication techniques are also proposed and discussed accordingly. Priority and data rate for the data sent by the grids is also taken care of in proposing these techniques. Since different communication techniques are used at each level, interoperability is an important issue. Different problems are addressed and solution are proposed.
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    Smart grid traffic modeling and scheduling using 3gpp lte for efficient communication with reduced ran delays
    (Telecommunications and Signal Processing (TSP), 2013) Muhammad Basit Shahab; Asif Hussain; Muhammad Shoaib
    There has been a dramatic improvisation in communication technologies during the last two decades. This in turn has evolved as a great source of strength to ideas regarding implementation of smart grids. This paper has three basic emphasis areas. At first, it presents a smart grid top to down hierarchy tree based traffic model by considering the different types of information carrying traffic travelling between multiple nodes of a smart grid. This is done by analyzing the multiple functions performed by a smart grid. After that 3GPP LTE is addressed as the most promising communication backbone for smart grid environment. Its performance has been analyzed in terms of high data rates, improved coverage and reduced Scheduling and Transmission delays. In the end, a priority based queuing technique for smart grid traffic is proposed by categorizing the smart grid traffic into different classes with each class representing a different type of information/data. This results in reducing the queuing delays of traffic at end and intermediate nodes. It has been shown through results that the proposed traffic modeling, scheduling and queuing result in reduced Random Access Network (RAN) delays.