Electronics and Computer Engineering
At the Electronics And Computer Engineering department office
Appointment on Visitation important
Topic: Rain Attenuation Studies
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.
|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 Senior Lecturer at the Department of Electronics and Computer Engineering
YUSSUFF has a Ph.D in Electrical Engineering (Satellite Communication) from University of Technology Malaysia