Books by ROLAND UHUNMWANGHO
Papers by ROLAND UHUNMWANGHO
Journal of Applied Sciences and Environmental Management
There are concerns on the amount of decommissioned solar photovoltaic (PV) power systems devices ... more There are concerns on the amount of decommissioned solar photovoltaic (PV) power systems devices getting into waste streams but with feeble management strategies in place. This paper evaluated the management of e-waste emanating from the use of solar PV powered systems at their end-of-life in the Niger Delta area of Nigeria using 90 intermediary stakeholders. The findings confirmed that the deployed management strategies were eccentric, inadequate, lacked sustainability and degrades the environment. Respondents were unaware and lack good understanding in applying appropriate management strategies for wastes from decommissioned solar PV power systems. An action framework for executing and enforcement management strategies for these wastes was developed for the study area.
Journal of Computational Mechanics ,Power System and Control, 2024
As the demand for renewable energy continues to rise, it becomes crucial to discover effective wa... more As the demand for renewable energy continues to rise, it becomes crucial to discover effective ways to enhance grid-connected photovoltaic (PV) battery energy storage systems. The Institute of Petroleum Studies (IPS) complex at the University of Port Harcourt in Rivers State, Nigeria, embarked on a quest to determine the optimal approach for optimizing their PV battery energy storage system. This research aimed to fulfill this need by employing a diverse research methodology, incorporating the innovative MOALO theory. To begin with, the research gathered primary and secondary data to construct models for the power grid, solarPV, and battery. Furthermore, it meticulously analyzed the load profile of the IPS complex, at the University of Port Harcourt. Leveraging the power of the MOALO theory.The researchers accurately sized the system and evaluated the potential outcomes of simultaneously interconnecting all loads. To gauge the system's performance, there was a calculation of various parameters such as economics, random walk, boundary conditioning, entrapping ants, and ant trap development. Remarkably, the outcome showed that the fitness responses between the two trial runs, facilitated by the integration of MOALO, were strikingly similar, revealing a typical concaveconnected shape, which is characteristic of a multi-objective solver. The optimal multi-objective cost implication of the system was estimated to be around 4,300 USD, with a power mismatch performance of approximately -1.7819e+09. Based on these compelling findings, the study concluded that MOALO serves as an impressive optimization tool capable of minimizing power mismatches and optimizing costs. Moreover, it recommended the generation of excess power as a means to achieve sustainability.
International journal of engineering research and technology, Jul 18, 2020
Energy from the sun has sustained man's activities for thousands of years. It can be harnessed di... more Energy from the sun has sustained man's activities for thousands of years. It can be harnessed directly as light energy to generate electricity from Photovoltaic (PV) Cells, or as thermal energy for heating, cooking, drying and electricity generation from thermal systems. However, using PV cells has been the preferred method of solar electricity generation for several decades now. Selecting the appropriate PV cell for a particular region requires a proper understanding of the basic mechanisms and functions of various PV technologies that are commonly used. In this paper, we have reviewed the progressive development of solar PV technologies from the first generation to present day configurations. Discussion is also made on the various Solar PV production data across different regions, including relevant recommendations for improvements.
Application of Genetic Algorithm to Solar Panel Efficiency; A Case Study of Port-Harcourt Metropolis
International Journal of Engineering, Jun 27, 2018
This study focuses on the evaluation of solar panel efficiency used within Port Harcourt environm... more This study focuses on the evaluation of solar panel efficiency used within Port Harcourt environment. A major factor affecting the efficiency of solar panels is the difference in region or weather and the ability of the solar panel to convert incident radiation into electrical energy. Solar panels have varying efficiency levels under different weather conditions. Most times solar panels fall short of expected efficiencies. It is therefore important to have adequate knowledge of the performance characteristics of a panel under specific weather to ensure maximum output. For this research work, the panel evaluated is a 125W Polycrystalline solar panel made of Gallium Arsenide. The efficiency of the panel is calculated and recorded. The weather data for Port-Harcourt is collected from the center for data collation Rivers State University. The peak radiation value obtained from the weather data for the year under consideration is used to evaluate the efficiency and Genetic Algorithm is used to determine the optimal parameter of the cells making up the panel to obtain an optimized cell to improve the efficiency of the panel. To do this the cell initial properties is extracted and tabulated genetic algorithm is then used to improve this properties achieving better efficiency in the process .
International journal of engineering research and technology, Jun 8, 2020
The abysmal performance of power sector in Nigeria requires an urgent attention. A deliberate and... more The abysmal performance of power sector in Nigeria requires an urgent attention. A deliberate and effective action must be taken by Power Utilities to provide lasting solutions to this problem that has lasted for decades. In order to meet the electricity demands of consumers, alternative means of generation in addition to the traditional centralized system of generation has been proposed in this paper. Distributed Generation (DG) is an excellent way that can be employed to solve the afore-mentioned problem. The transient stability of Port Harcourt distribution network is studied when DG unit is integrated into it. The distribution system performance with different levels of DG penetration is investigated when a balanced three phase fault is applied to the network. The result shows an improvement in the transient stability of the network. The power angle swings to 50 degree approximately without DG and improved to 38 degree with DG.
The study deals with the development of a Matlab-Simulink model to simulate a Tidal Current Turbi... more The study deals with the development of a Matlab-Simulink model to simulate a Tidal Current Turbine. The purpose of the simulation model is to evaluate the potential for Tidal Current Power Generation in Nigeria. A case study of Qua Iboe River is presented. The river is tidally dominated, and experiences a tidal range of about 2 meters during spring tide periods. The tides in the site were analyzed using a MATLAB program known as World Tides. Analysis from the World Tides gave the corresponding value of the amplitude, frequency and phase for each tidal constituent. A modelling of the tidal current velocity profile was performed and the results from the model shows that Qua Iboe River has an average current velocity of about 0.82 m/s. Power from a typical single turbine was modeled in MATLAB/Simulink, and the resulting power was 37.84 KW. Cost/KWh was estimated to be 104.4 naira. In conclusion, Qua Iboe River which flows in a North-South direction to the Atlantic Ocean has the potential to be a location for Tidal current turbine installation. This may not be financially feasible under current technology. However, with the great interest shown in this area in recent times, lower installation cost, and the urge to "go green", this will be applicable in the future.
Nigerian Journal of Technology, Jan 17, 2018
Protection scheme of a radial network fails in coordination when additional power source is provi... more Protection scheme of a radial network fails in coordination when additional power source is provided to the network via distributed generator other than a single source of power. Trans Amadi, 33 kV radial distribution network in Port Harcourt, Nigeria, has manually operated isolators backing up circuit breakers at substation. This arrangement alone cannot overcome rising issues due to bidirectional/multidirectional flow of power in a radial network whenever distributed generators are connected. There is therefore, a need for a protection scheme to be adopted whose devices can "coordinate" as well as offer a reliable protection to the network. This paper proposes a protection scheme design using coordinated behaviours of relay-operated reclosers and sectionalizers, as well as manages the effect distributed generators has, in a radial network using fault current limiter. Proposed protection scheme show results of a good coordination, mis-cordination and an improved coordination, without distributed generator, with distributed generator and with a fault current limiter respectively.
Power Quality Improvement in Distribution Network: A Case Study
In this book, Artificial Neural Network (ANN) controller based dynamic voltage restorer (DVR) is ... more In this book, Artificial Neural Network (ANN) controller based dynamic voltage restorer (DVR) is applied to mitigate voltage swell and voltage sag in Rumuola Distribution Network in Rivers State, Nigeria; the book: Discusses Power quality problems, their sources and effects, power quality indices, application of custom devices, and contributions of several authors to power quality improvement. Answers the question why Power quality is of great concern in recent times. Covers the design of DVR and ANN controller, Simulation of ANN controller based DVR in MATHLAB using a replicated network diagram of Rumuola Distribution Network of Rivers State Nigeria, and the analyses of results obtained.
Journal of Future Sustainability
The global value chain (GVC) recognizes post production processes that involve socio economic eng... more The global value chain (GVC) recognizes post production processes that involve socio economic engagements of stakeholders with electrical and electronic equipment (EEE or e-products) at their near or end of life. This paper attempts to measure some of the key social, economic, environmental, and sustainability indicators in line with GVC for lithium-ion batteries from e-products at their near or end of life. The assessment was based on the socioeconomic impacts on the battery sector for managing spent lithium-ion (Li-ion) batteries in Southeastern Nigeria. The study methodology highlighted strategic features in line with socioeconomic assessment by deploying questionnaire administration. Ten (10) local government areas (LGAs) were purposely selected from five mutually exclusive States, with 100 stakeholders investigated. Descriptive statistics were used to analyze data for innovation potentials for the battery recycling/refurbishing sector, and discussed accordingly under sustainabi...
Nigerian Journal of Technology
The off-grid coastal areas of Delta State are rich in energy resources including natural gas and ... more The off-grid coastal areas of Delta State are rich in energy resources including natural gas and solar irradiation; but do not have access to electricity. Accordingly, this paper proposes a sustainable solution for power supply in these areas using the method of simulation. Specifically, using the Hybrid Optimization Model for Multiple Energy Resources (HOMER) software, the most feasible or optimal design configuration for sustainable means of power supply for off-grid areas was presented. The result obtained was then assessed based on the various available funding options. In particular, the Public-Private-Community- Oil and Gas Partnership (PPCOP) funding model presents the most feasible solution that delivers the lowest cost of electricity (COE) to the consumer, based on the premise that some of the components of the power supply value chain are donated to the project rather than bought.
This paper presents a mathematical model to explain the phenomenon of tidal energy and the creati... more This paper presents a mathematical model to explain the phenomenon of tidal energy and the creation of a Matlab/Simulink to illustrate how the tidal current energy system works which is essential in power generation. A thorough explanation of tidal energy, including the science of tidal power, as well as the different operating mode has been discussed in this paper. Various literatures has been reviewed, the method used in this work were adopted from Sir Isaac Newton Famous Law of Gravitation. The derived model were applied in Matlab/Simulink, an output result were analyzed. Based on these result it was argued that tidal current has huge amount of energy that can be extracted and converted to a usable form. Tide can be predicted years in advance, its deployment has several benefits.
Failure Analysis of Distribution Transformers - A Case Study of Ughelli Business Unit
Programmable Device Circuits and Systems, 2018
Analysis of Distribution Transformers failures was carried out in Ughelli Business unit in Delta ... more Analysis of Distribution Transformers failures was carried out in Ughelli Business unit in Delta State under the Benin Electricity Distribution Company (BEDC). The aim of this study was to find out the cause of Distribution Transformer failure and proffer solution to mitigate it. Data includes numbers of transformers in each of the service center and their ratings, customer population and the failures reported in the past four (10) years in the Unit. Upon our analysis, the failures were seen to be dominant in transformers with 100kVA, 200kVA, and 300kVA ratings. Personal investigation revealed that protection integrity of visually all the transformers in the unit have been violated as wire-fusing has been a common practice with almost same size of wire. In other to avoid the continuous failures as a result of over fusing, a new method for calculating the actual size of wire to be used as fuse was developed.
Artificial Intelligent Techniques in Real Time Diagnosis of Stator and Rotor Faults in Induction Machines
International Journal of Scientific and Engineering Research
This work involves the development of an artificial intelligent (AI) scheme in the detection of r... more This work involves the development of an artificial intelligent (AI) scheme in the detection of rotor and stator faults in induction machines. Using discrete wavelet transform technique to process the stator current signals measured from faulty motors with isolated cases of rotor and stator faults, the signals are then matched against known fault signatures for the types of fault. The statistical features of fault signals such as mean, Skewness etc. were then extracted and fed to an Artificial Neural Network (ANN) for training. Different ANN architectures were then compared in terms of their accuracy in classification. The network with the lowest mean squared error was then tested with separate data set and the results found to be satisfactory
Assessment of Economic Viability of Wind Power Plant in Bonny Island of Rivers State of Southern Nigeria for Cleaner Electricity Generation
International Journal of Engineering Research in Africa
This paper presents the economic viability of a 30 MW wind power plant in Bonny Island, Rivers St... more This paper presents the economic viability of a 30 MW wind power plant in Bonny Island, Rivers State, Nigeria, as a mandate to define the suitability of siting wind farms for the purpose of electricity generation. Bonny Island is presently not connected to Nigeria utility grid, as such sustainable and reliable electricity generation is desirable. In this work, wind electricity generation and economic assessment of Enercon E-82 (2 MW) wind turbines operating at 78 m hub height was investigated. The result showed the chosen turbine model can generate total annual electricity of 89,684 MWh at an energy cost of $0.1/ kWh and 38,796 tons of CO2 on greenhouse gas saving. The result also showed that the wind power generation is economically viable in Bonny Island. Keywords: Renewable energy, wind power, RETScreen, Economic Assessment, Bonny Island.
Sustainable Energy Technologies and Assessments, 2020
Recently, the use of hydro power as a renewable energy source, to provide power solutions is on t... more Recently, the use of hydro power as a renewable energy source, to provide power solutions is on the rise. Currently, one-fifth of the global electricity generation is from hydro power technology. In this study, the potential of harnessing Small Hydro Power (SHP) in Cross River State of the southern part of Nigeria is presented, considering the different sites of hydro power in the entire state. The concentration of SHP potential sites is skewed heavily towards regions with hills and forest cover. The cost of the SHP project in this work is based on power potential of flow at the lean season, however, the actual cost was established based on the extracted peak seasonal power. In the ranking of the sites for the study, power potential and cost were used as criteria. The recommended top three sites based on the ranking of the SHP projects were: Kwa Falls, located in Akamkpa, Kundeve stone market stream, located in Obanliku and Ajasor mission Atang stream, located in Etung. Other criteria used for the selection of sites for development includes: isolation from the grid, high cost of transmitting power from the grid to such communities, economic potential, population and development goals of the government.
Hydrogen production in hybrid renewable energy system and power factor improvement
2016 3rd International Conference on Electrical Energy Systems (ICEES), 2016
A hybrid power generation system suitable for serving an off grid micro power system consisting o... more A hybrid power generation system suitable for serving an off grid micro power system consisting of diesel generation, biogas, solar PV, wind turbine, micro-hydro plants and dc generator of fuel cell type is proposed in this work. The concept of hybridizing renewable energy sources help in augmenting expensive constantly run diesel generator in providing power. This work is based on the modeling, simulation, optimization and sensitivity analysis considering the net present cost, levelized cost of electricity, operating cost and performance of a renewable energy system having load of 20.6 kW under rural electricity supply. The hybrid optimization model for electric renewable (HOMER) software is used in the course of the study to design and optimize the proposed hybrid system. A solar PV-hydrogen system is used in which an electrolyzer converts excess PV power into hydrogen gas. The closed operating condition output of Hydrogen Tank is fed to a Fuel Cell, which intern output is connected to a busbar. The hydrogen gas obtained via electrolysis process is further used as sustainable onsite refueling. The proposed arrangement leads to dual way of producing electricity at a lower cost and also provides opportunity for future energy storage. Furthermore, the radial distribution network of the system is modeled in AMTECH software to improve the system power factor with a load factor of 0.476 in rural supply division. The reported load is used by the community, Al-Zahia-Musandam area of Oman.
The small hydropower system is one of the most effective renewable sources of energy for sustaina... more The small hydropower system is one of the most effective renewable sources of energy for sustainable development. This paper presents the hydropower basic energy main elements in a small hydro scheme, site location, and flow duration curve in relation to assessing power and energy requirement in a small hydro system. The capital cost of small hydro plants compared to other options of power supply and the financial profitability of small hydro are also discussed. Improving air quality and public health by reducing greenhouse emissions and increasing reliability of power supply with cheaper cost de-centralized or distributed generation are some of the outcomes achieved from small hydro system. Finally, strengthening national policy frameworks and the integration of hydro energy, enhancing national capacity for research and development and transfer and diffusion of small hydro energy technologies, establishing markets for small hydro, increasing access to finance and establishing enter...
Hybrid Optimization Model for Electrical Renewable (HOMER), is a micro power optimization model, ... more Hybrid Optimization Model for Electrical Renewable (HOMER), is a micro power optimization model, that simplifies the task of evaluating designs of both off-grid and grid-connected power systems for a variety of applications. The HOMER Hybrid Optimization Modeling Software is used for designing and analyzing hybrid power systems, which contain a mix of conventional generators, cogeneration, wind turbines, solar photovoltaic, hydropower, batteries, fuel cells, hydropower, biomass and other inputs. This paper investigates the energy efficiency of renewable energy system considering an isolated AC diesel generator. A model system consisting of a PV, three batteries and a converter system was considered. HOMER was able to calculate the best option that would give the best energy efficiency. Also, a further investigation was carried out considering two cases with two different load profiles to show that the load profiles affects the responses of the renewable energy system and the cash fl...
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Books by ROLAND UHUNMWANGHO
Papers by ROLAND UHUNMWANGHO