YUSSUFF ABAYOMI ISIAKA

Electronics and Computer Engineering

At the Electronics And Computer Engineering department office

Appointment on Visitation important

Topic: Rain Attenuation Studies

Description: The study of rain attenuation involves investigating the factors responsible for electromagnetic wave or microwave signal outages due to rainfall. Attenuation is degrading in the quality of transmitted signals as it travels farther away from its source; hence reducing the signal-to-noise ratio from unity. The distribution of rain along the radio propagation path is inhomogeneous in both the horizontal and vertical directions, and this non-uniformity makes slant-path attenuation quite complex to estimate. Again, at frequencies above 10 GHz or millimetre wave band , the effects of attenuation and noise induced by atmospheric gases and rain are quite significant. This results in microwave signal amplitude fading slow or rapid , scintillations amplitude or/and phase , depolarization, and receiver antenna noise. Heavy rain is usually confined to a smaller area than lighter rain, and the rain cells, may take any shape - It is spherical for small size cells, oblate spheroidal or oblate distorted for medium and large size rain drops respectively. This information is needed to indicate the best distribution model of rain falls within tropical climate, which is a very important factor in the rain attenuation model simulation. Furthermore, the relationship between the rainfall rate and the attenuation is highly dependent on the effective path length. Semi-empirical methods are widely accepted because it is easier to extrapolate the results to other sites, in contrast to direct measurement which is expensive and it takes a long period of time to collect statistically meaningful data. The standard acceptable time exceedance, as stipulated by ITU-R, is 0.01% of unavailability, which translates to 99.999% of availability or an outage time of not more than 5.26 minutes/year for commercial use. However, for domestic and military applications, it is 0.1% and 0.001% respectively.

#	Certificate	School	Year
1.	Ph.D (Electrical Engineering Satellite Communication )	University of Technology Malaysia	2014

PERFORMANCE ENHANCEMENT OF POWER SYSTEM NETWORK USING STATIC SYNCHRONOUS SERIES COMPENSATOR

The use of a group of power electronic-based controller called Flexible Alternating Current Transmission Systems FACTS was studied in this paper. Static Synchronous Series Compensator SSSC was applied for the assessment of the performance of power system network using the Nigerian 28-bus and the IEEE 30-bus power networks as case studies. Newton-Raphson based power flow equations was modeled and MATLAB/PSAT toolbox R2016a was deployed with SSSC on bus 30 to determine overall influence of the voltage profile level of power loss on most buses for power system networks in catering for the customers demand. The results showed that, with the inclusion of SSSC, voltage profile can improve tremendously with significant reduction in power losses across power system networks. Obviously, the voltage profile improvement produced due to the inclusion of SSSC will definitely will result in greater benefits to utilities; while supplying cheaper power to consumers. It is therefore recommended that, more than one controller should be used on the same system for further studies.

YUSSUFF ABAYOMI is a Associate Professor / Reader at the Department of Electronics and Computer Engineering

YUSSUFF has a Ph.D in Electrical Engineering Satellite Communication from University of Technology Malaysia