MODELING, ANALYSIS AND SIMULATION OF A DC GRID SINGLE ENDED PRIMARY INDUCTANCE CONVERTER FOR DC LOAD
MODELING, ANALYSIS AND SIMULATION OF A DC GRID SINGLE ENDED PRIMARY INDUCTANCE CONVERTER FOR DC LOAD
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Date
2014-12
Authors
AJAYI, Samuel Taiwo
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Abstract
This research studied a circuit topology of a solar based Single Ended Primary Inductance
Converter (SEPIC) system and a battery furnishing a permanent magnet dc motor with current
via a dc grid. The complete model equations of the entire system were derived. Harmonic
balance technique was used to determine the converter steady state and ripple quantities.
Analyses investigating the relationship of the converter state variables as a function of its duty
ratio were developed. Results show that operating the converter between 0 – 0.4 duty ratio give
best system performances. On the other hand, results show that operating the converter above
this range limits the converter optimal performance. The consequence of operating the system
with duty ratios above 0.4 is that the ripples in the voltage and current waveforms increase. More
so, results also show that for a steady state current of 12 A, for the permanent magnet dc motor
in a period of low solar insolation, operating a Bi-directional converter at specific values of duty
ratio causes the battery to discharge much faster compare to operating at duty ratio of 0.78. Two
solar insolation data for Zaria (Lat 11.0670N Long 7.70E) was obtained from National
Aeronautics and Space Administration (NASA) for a period of January to December 2013 and
another ground level captured from Electrical & Computer Engineering Department using the
data acquisition module (model TQ 140876-002) from August 17 to September 24, 2014. These
insolation data from both stations were used to validate the efficiency of the proposed design.
The targeted load demand of approximately 2441.43W was achieved. This represents 97.66 %
of the load demand designed for in this research. The designed solar energy system contributed
70% of the power to the load, while the battery supplied 30% of the load demand power. An
effective hybrid storage system based on solar and battery was achieved, which met the designed
objective of this research.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER OF SCIENCE (M.Sc.) DEGREE IN ELECTRICAL ENGINEERING
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING, FACULTY OF ENGINEERING, AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
DECEMBER, 2014
Keywords
MODELING,, ANALYSIS,, SIMULATION,, DC GRID SINGLE,, PRIMARY INDUCTANCE,, CONVERTER,, DC LOAD.