Papers by Abdul-Ganiyu Adisa Jimoh
2012 XXth International Conference on Electrical Machines, 2012
ABSTRACT Induction motors have been the workhorse of industry since decades. With the rapid advan... more ABSTRACT Induction motors have been the workhorse of industry since decades. With the rapid advancement in industry and transport the need exists for machines with higher power per volume, efficient and better reliability to widen the application range and drive bigger and crucial loads. Higher phase order machines have been identified as a viable solution to meet these needs. This paper is on the concept of using a six phase machine as different devices consisting of three or six phases. A study is done using a symmetrical six phase structure and configuring it to operate as a three phase motor, six phase motor and three phase motor with reactive compensation. Some parts of mathematical modeling are presented as well as Matlab/Simulink simulation results.
International Conference on Neural Information Processing, 2007
Phase voltage and current unbalances in power system distribution networks are major factors lead... more Phase voltage and current unbalances in power system distribution networks are major factors leading to extra losses, communication interference, equipment overloading, and malfunctioning of the protective relay, which consequently results in service quality and operation efficiency being reduced. As a better alternative to the traditional practices of manual trial and error, and the contemporary solution technique of network reconfiguration or
IEEE Power and Energy Society Conference and Exposition in Africa: Intelligent Grid Integration of Renewable Energy Resources (PowerAfrica), 2012
ABSTRACT This paper analyses the influence of intermittent wind power generation on the oscillati... more ABSTRACT This paper analyses the influence of intermittent wind power generation on the oscillation of a power system considering different load levels. The fluctuation in the eigenvalues and the eigenvectors resulting from intermittent wind power generation are calculated using Monte Carlo simulation with Latin hypercube sampling via modal analysis. An index known as “probability of stability” is used to determine the level of stability of the power system at different load levels due to variation in electromechanical modes resulting from changes in wind speeds. One of the key results shows that the load level of a power system has significant effects on the small signal stability of a power system consisting of wind generators. The result is validated using time domain simulation.
2010 Conference Proceedings IPEC, 2010
The output voltage and current of renewable energy sources such as Photo-voltaic are not controll... more The output voltage and current of renewable energy sources such as Photo-voltaic are not controlled. Consequently PV-Grid interface system is employed condition output voltage and current into the grid. This call for efficient and well designed control strategies to ensure reliability, stability and quality power output. This paper proposes nine-level cascaded NPC/H-bridge inverter as the PV-Grid interface. Cascaded NPC/H-Bridge inverter is modeled and a control law for realizing nine-level output with reduced harmonic content is developed. Modeling is easily achieved by considering the whole inverter as having four cascaded three level legs, two positive and two negative. Then a mathematical model is formulated for LCL filters assuming that the resistances associated with the inductances have negligible effect on the system steady state variables. Finally a control technique is developed for the whole system and its robustness tested by carrying out several simulations tests in MATLAB under different operating conditions.
AFRICON 2007, 2007
... machine. Agu, Anih, Ojo and Jimoh [1] proposed the use of cascaded machine configuration, wit... more ... machine. Agu, Anih, Ojo and Jimoh [1] proposed the use of cascaded machine configuration, with each of the cascaded machine having two windings. The possibility of an infinitely large (Ld/Lq) ratio was presented. However ...
2012 Sixth IEEE/PES Transmission and Distribution: Latin America Conference and Exposition (T&D-LA), 2012
ABSTRACT This paper seeks to identify and classify power system networks based on their inherent ... more ABSTRACT This paper seeks to identify and classify power system networks based on their inherent definitive structural property. The participation between the load buses is observable from the eigenvectors obtained from a Schur complement of the Y-admittance matrix. This is used to classify power system networks as either topologically strong or weak. Results show that in a topologically weak network, load voltages are below the nominal voltage limit. Conversely, in a topologically strong network they are above the nominal limit.
Electric Power Systems Research, 2014
This paper proposes a novel transmission line fault location scheme, combining stationary wavelet... more This paper proposes a novel transmission line fault location scheme, combining stationary wavelet transform (SWT), determinant function feature (DFF), support vector machine (SVM) and support vector regression (SVR). Various types of faults at different locations, fault impedance and fault inception angles on a 400 kV, 361.297 km transmission line are investigated. The system only utilizes single-end measurements. DFF is used to extract distinctive fault features from 1/4 cycle of post fault signals after noise and the decaying DC offset have been eliminated by a filtering scheme based on SWT. A classifier (SVM) and regression (SVR) schemes are subsequently trained with features obtained from DFF. The scheme is then used in precise location of fault on the transmission line. The result shows that fault location on transmission lines can be determined rapidly and correctly irrespective of fault impedance.
2013 Africon, 2013
ABSTRACT The challenging and vitiated situation of electricity in Namibia is addressed in this pa... more ABSTRACT The challenging and vitiated situation of electricity in Namibia is addressed in this paper. The country is importing about 53% of its electricity from the neighbouring countries such as South Africa, Botswana, Zimbabwe and Zambia. This has caused high price of electricity in the country and by extension imposes financial burden on the citizen. In order to alleviate this problem and reduce high dependence on imported electrical power, several solar energy pilot projects have been implemented in the country. On the other hand South Africa is among the countries with experience in Smart Grids. Based on the experience of a residential house with a monthly load greater than 500 kWh using Smart Metering and a solar Photovoltaic panel connected to the grid in South Africa, this paper shows that this experience is feasible and can be successfully adapted in Namibia.
Transactions of the South African Institute of Electrical Engineers
Transactions of the South African Institute of Electrical Engineers
Multilevel converters have emerged as the state of the art high power conversion for applications... more Multilevel converters have emerged as the state of the art high power conversion for applications in reversible power flow. Electric power could be tapped from or injected to the grid regardless of the discrepancies in voltage levels, frequency, phase number and different modes of operation of the grid and the system. This paper presents an overview of different topologies of multilevel converters and modulation strategies with a verification of back-to-back neutral point converter for bidirectional power flow application.
Journal of Electrical Engineering
The empirical model developed in this study uses standard specifications together with actual sol... more The empirical model developed in this study uses standard specifications together with actual solar radiation and cell temperature to predict voltage-current characteristics of a photovoltaic panel under varying weather conditions. The paper focuses on the modelling of hourly cloudless solar radiation to provide the insolation on a PV module of any orientation, located at any site. The model is built in Matlab/Simulink environment to provide a tool that may be loaded in the library. It is found that the predicted solar radiation strongly agrees with the experimental data from the National Renewable Energy Laboratory (NREL). Further, a satisfactory agreement between the predicted voltage-current curves and laboratory measurements is obtained.
Journal of Energy in Southern Africa
Journal of Energy in Southern Africa
This paper analyses wind speed characteristics and wind power potential of Port Elizabeth using s... more This paper analyses wind speed characteristics and wind power potential of Port Elizabeth using statistical Weibull parameters. A measured 5-minute time series average wind speed over a period of 5 years (2005-2009) was obtained from the South African Weather Service (SAWS). The results show that the shape parameter (k) ranges from 1.319 in April 2006 to 2.107 in November 2009, while the scale parameter (c) varies from 3.983m/s in May 2008 to 7.390 in November 2009.The average wind power density is highest during Spring (September-October), 256.505W/m 2 and lowest during Autumn (April-May), 152.381W/m 2. This paper is relevant to a decision-making process on significant investment in a wind power project.
For a successful energy management, it is vital to have an in depth and evident assessment of key... more For a successful energy management, it is vital to have an in depth and evident assessment of key drivers underlying the past development of energy consumption. In this paper we present an index decomposition analysis to assess the activity, structural and intensity effects responsible for the South African industrial energy consumption between 1978 and 2008.
IEEE Power Engineering Society Conference and Exposition in Africa, PowerAfrica, 2005
This paper is focusing on the development of intelligent agent technology and application of that... more This paper is focusing on the development of intelligent agent technology and application of that technology to the mining and metallurgical sector. We have shown how networks of communicating and cooperating intelligent software agents can be used to implement complex distributed systems. In the mining and metallurgical industries there are processes which cannot tolerate interruption, such as some sequential line
International Aegean Conference on Electrical Machines and Power Electronics, 2007
As generally known there is no energy transfer between a dc current and a current transformer. Af... more As generally known there is no energy transfer between a dc current and a current transformer. After a brief overview of other methods for tapping energy from the high voltage direct current transmission line, this paper presents the concept of a new dc to ac current source converter utilizing a current transformer. The advantage of this converter is that it
Journal of Renewable and Sustainable Energy, 2012
ABSTRACT This paper reports on the influence of wind power on transient stability of a power syst... more ABSTRACT This paper reports on the influence of wind power on transient stability of a power system taking into consideration the stochastic nature of a disturbance to the network. Traditionally, transient stability is evaluated using the deterministic method. This technique is usually considered for a single operating condition so called the worst case scenario. However, factors that affect the transient stability of a power system such as types of disturbance and its location, the clearing time, and even the pre-disturbance system state are all random processes. A probabilistic method using conditional probability is used in analysing the effects of wind generator technologies, wind power location, and wind power penetration level on the transient stability of a power system. The indices for probability of stability are established; comparison is made between the probabilistic and deterministic techniques in the evaluation of risk of instability of a power system consisting wind generators. DigSilent power factory 14.0 and matlab™ are employed in the analysis. Some of the key results show that wind power has both positive and negative influences on the transient stability of a power system depending on the location of the wind farm and the penetration level of the wind power. The deterministic approach gives a high pessimistic result compared to the probabilistic method. The probabilistic technique has the ability to quantify the level of instability in a power system.
IEEE International Conference on Industrial Engineering and Engineering Management, 2011
A common problem faced by managers is that of project selection, to decide which project out of t... more A common problem faced by managers is that of project selection, to decide which project out of the lots should be undertaken. This paper aims at comparing results of the application of two approaches - respectively regression analysis, a parametric method and artificial neural network, a non-parametric technique. To demonstrate these methods, the models were illustrated using Oral, Kettani and
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Papers by Abdul-Ganiyu Adisa Jimoh