Strathmore Energy Research Centre (SERC)http://hdl.handle.net/11071/3963https://su-plus.strathmore.edu/retrieve/f48e4bd3-e37a-4586-b126-549d22f8c198/2024-03-29T06:56:00Z2024-03-29T06:56:00Z451Analysis of induction generator controller techniques for Pico hydropower - a case study of a 3kW Pico hydropower scheme in Kasese, Western UgandaIzael Da SilvaTeddy NalubegaOkou RichardMary Suzan AbboDa Silva, Izaelhttp://hdl.handle.net/11071/133602023-12-03T18:41:42Z2014-01-01T00:00:00Zdc.title: Analysis of induction generator controller techniques for Pico hydropower - a case study of a 3kW Pico hydropower scheme in Kasese, Western Uganda
dc.contributor.author: Izael Da Silva; Teddy Nalubega; Okou Richard; Mary Suzan Abbo; Da Silva, Izael
dc.description.abstract: This paper presents a comparative analysis of control techniques used on induction generators for stand-alone Pico hydropower schemes. The techniques were tested on a prototype Pico hydropower system modeled for the site developed in western Uganda by the Centre for Research in Energy and Energy Conservation. The case study scheme to date is manually operated, a process that requires constant attention due to variations in load. This demonstrated the need for an automatic load controller. The site specifications were considered when designing models using Matlab simulink employing the automatic load control techniques. These model designs are simple so that it is affordable for local practical application. The proposed designed control techniques presented in this paper are composed of logic gates, IGBT switch, uncontrolled diode rectifier, the PID controller and other semiconductor devices supplying an electrical load and a ballast load. In addition, the response of the case study site and the Matlab model to load variations is presented.
dc.description: 2014 International Conference on the Eleventh industrial and Commercial Use of Energy
2014-01-01T00:00:00ZComparative performane analysis of a solar box cooker and improved charcoal stoves in MozambiqueDa Silva, I. P.Cuamba, B. CNhabetse, M. T.Da Silva, Izaelhttp://hdl.handle.net/11071/133592023-12-03T18:41:16Z2014-09-01T00:00:00Zdc.title: Comparative performane analysis of a solar box cooker and improved charcoal stoves in Mozambique
dc.contributor.author: Da Silva, I. P.; Cuamba, B. C; Nhabetse, M. T.; Da Silva, Izael
dc.description.abstract: With exception of South Africa, where only 16% of the population depends on traditional biomass energy, almost 80% of the population in the sub-Saharan Africa depends on biomass resources for cooking and heating. The burning of traditional biomass in the so-called three stones stove puts pressure on biomass resources because of its inefficiency. Besides, fumes and soot are related to respiratory diseases that are the common cause for deaths among women and children in Africa. The shortage of fire wood makes women and girls to walk in search of fuel for cooking. Solar cooking is one of the possible solutions for this poignant problem. Yet another partial solution is the use of improved biomass stoves. This paper presents a comparative analysis of the performance of solar box cooker and improved charcoal stove in Mozambique, in its technical and economic aspects.
dc.description: ISES Conference Proceedings (2014)
2014-09-01T00:00:00ZInductive Voltage Transformers Calibration by the ParametersBrandao, F.ADa Silva, I. P.Demetri, I.De Silos, A. C.Diaz, E. MDa Silva, Izaelhttp://hdl.handle.net/11071/133582023-12-03T18:41:33Z2010-01-01T00:00:00Zdc.title: Inductive Voltage Transformers Calibration by the Parameters
dc.contributor.author: Brandao, F.A; Da Silva, I. P.; Demetri, I.; De Silos, A. C.; Diaz, E. M; Da Silva, Izael
dc.description.abstract: The accuracy class of an IVT - Inductive Voltage Transformer - is typically assessed in laboratory installations either by comparing with another IVT presenting greater accuracy and traceable to a national laboratory or by using a capacitive divider. Calibration in the field using internal parameters is considered herein, using results obtained from typical open and short circuit tests and winding resistances, performed with common meters. A Möllinger & Gewecke graphic diagram is employed together with the results of an accuracy test previously carried out to determine the exact value of the winding turn relation and of the primary winding dispersion reactance. These values are used to calculate the phase and ratio errors, which must lie between definite limits, defined by the accuracy class of the instrument. Four commercial IVTs were tested to determine the validity of the procedure. The errors are compared with those obtained with the Schering-Alberti method (AC Bridge and comparison with standard IVT).
dc.description: WSEAS Transactions on Systems and Control Volume 5 Issue 2 February 2010 pp 102–111
2010-01-01T00:00:00ZEconomics of a Gasification Based Mini Grid - a case study of a 10 kW Unit in UgandaDa Silva, I. P.Buchholz, T.Volk, TTennigkeit, TDa Silva, Izaelhttp://hdl.handle.net/11071/133572023-12-03T18:41:19Z2007-01-01T00:00:00Zdc.title: Economics of a Gasification Based Mini Grid - a case study of a 10 kW Unit in Uganda
dc.contributor.author: Da Silva, I. P.; Buchholz, T.; Volk, T; Tennigkeit, T; Da Silva, Izael
dc.description.abstract: Small-scale wood gasification systems have the potential to contribute to the rural electrification in Uganda. This paper presents an economic analysis of a 10 kW gasifier unit and its minigrid installed on a Ugandan farm. The bioenergy system has been running stable on a six hour daily base for seven months. When the gasifier is operated close to the rated capacity, the gasifier system is economically attractive compared to diesel generated electricity Results indicate that replicating successful wood gasification systems stipulates integration of sustainable fuelwood supply and viable business models.
dc.description: Conference Proceedings of the Industrial and Commercial Use of Energy
2007-01-01T00:00:00ZOn Site Calibration of Inductive Voltage TransformersDa Silva, I. P.Demetri, I.De Silos, A. C.Brandao, F. A (Jr)Da Silva, Izaelhttp://hdl.handle.net/11071/133562023-12-03T18:41:30Z2009-01-01T00:00:00Zdc.title: On Site Calibration of Inductive Voltage Transformers
dc.contributor.author: Da Silva, I. P.; Demetri, I.; De Silos, A. C.; Brandao, F. A (Jr); Da Silva, Izael
dc.description.abstract: The accuracy class of an IVT – Inductive Voltage Transformer – is typically assessed in laboratory installations either by comparing with another IVT presenting greater accuracy and traceable to a national laboratory or by using a capacitive divider. Calibration in the field is considered herein, using results obtained from typical open and short circuit tests and winding resistances, performed with common meters. A Möllinger & Gewecke graphic diagram is employed together with the results of an accuracy test previously carried out to determine the exact value of the winding turn relation and of the primary winding dispersion reactance. These values are used to calculate the phase and ratio errors, which must lie between definite limits, defined by the accuracy class of the instrument. Four commercial IVTs were tested to determine the validity of the procedure. The errors are compared with those obtained with the Schering-Alberti method (AC Bridge and comparison with standard IVT)
dc.description: 8th WSEAS International Conference on System Science and Simulation in Engineering
2009-01-01T00:00:00ZRural electrification practicalities of using single wire earth return for low cost grid extension - the case of Ntenjeru UgandaBakkabulindi, G.Da Silva, I. P.Lugujjo, E.Da Silva, Izaelhttp://hdl.handle.net/11071/133552023-12-03T18:41:07Z2009-08-01T00:00:00Zdc.title: Rural electrification practicalities of using single wire earth return for low cost grid extension - the case of Ntenjeru Uganda
dc.contributor.author: Bakkabulindi, G.; Da Silva, I. P.; Lugujjo, E.; Da Silva, Izael
dc.description.abstract: The fact that the vast majority of Uganda’s rural areas remain un-electrified makes it imperative that low cost distribution technologies be implemented in order to provide affordable electricity to rural households. Such low cost technologies include the Shield Wire System (SWS), Single Wire Earth Return (SWER) and appropriate engineering techniques. The SWER technology is presented in this paper as well as the implications of its proposed implementation for electrification of the village of Ntenjeru in Uganda. While SWER can reduce the costs of electrification by more than a third compared to conventional high tension transmission lines, there are stringent grounding and safety issues as well as load capacity constraints involved. Furthermore, with the earth used as a current return path, soil resistivity analysis is important in these systems. Since soil resistivity can vary sharply over varying terrain and in different weather conditions, robust SWER systems have to be carefully designed. An analysis of the financial and electrical load implications of this technology in Uganda’s local conditions will be presented and its viability as a sustainable method for electric energy distribution in the chosen case study area.
dc.description: Conference Paper - International Conference on Energy and Sustainability
2009-08-01T00:00:00ZTriple Helix as a strategic tool to fast-track climate change adaptation in rural Kenya - case study of Marsabit CountyDa Silva, I. P.Bricca, DMicangeli, ADavide, F.Cherubini, P.Da Silva, Izaelhttp://hdl.handle.net/11071/133542023-12-03T18:41:03Z2021-01-01T00:00:00Zdc.title: Triple Helix as a strategic tool to fast-track climate change adaptation in rural Kenya - case study of Marsabit County
dc.contributor.author: Da Silva, I. P.; Bricca, D; Micangeli, A; Davide, F.; Cherubini, P.; Da Silva, Izael
dc.description.abstract: The lack of affordable, clean, and reliable energy in Africa’s rural areas forces people to resort to poor quality energy source, which is detrimental to the people’s health and prevents the economic development of communities. Moreover, access to safe water and food security are concerns closely linked to health issues and children malnourishment. Recent climate change due to global warming has worsened the already critical situation. Electricity is well known to be an enabler of development as it allows the use of modern devices thus enabling the development of not only income-generating activities but also water pumping and food processing and conservation that can promote socioeconomic growth. However, all of this is difficult to achieve due to the lack of investors, local skills, awareness by the community, and often also government regulations. All the above mentioned barriers to the uptake of electricity in rural Kenya could be solved by the coordinated effort of government, private sector, and academia, also referred to as Triple Helix, in which each entity may partially take the other’s role. This chapter discretizes the above and shows how a specific county (Marsabit) has benefited from this triple intervention. Existing government policies and actions and programs led by nongovernmental organizations (NGOs) and international agencies are reviewed, highlighting the current interconnection and gaps in promoting integrated actions toward climate change adaptation and energy access.
dc.description: Book chapter in W. Leal Filho et al. (2021) African Handbook of Climate Change Adaptation
2021-01-01T00:00:00ZSustainability of Sugarcane, Bagasse, Briquettes and Charcoal Value Chains in Kenya: Results and Recommendations from Implementation of the Global Bioenergy Partnership IndicatorsWilliamson, L.N’Goran, K.Labriet, M.Diaz-Chavez, R.Wanjiru, H.Ogeya, M.López, N. G.Oduor, N.Ogutu, P. C.Da Silva, I. P.Wambugu, A. C.Ndufa, J.Ochieng, P. A.Gitau, J. K.Muchiri, M.Nyambati, R.United Nations Environment ProgrammeDa Silva, Izaelhttp://hdl.handle.net/11071/133532023-12-03T18:41:10Z2019-01-01T00:00:00Zdc.title: Sustainability of Sugarcane, Bagasse, Briquettes and Charcoal Value Chains in Kenya: Results and Recommendations from Implementation of the Global Bioenergy Partnership Indicators
dc.contributor.author: Williamson, L.; N’Goran, K.; Labriet, M.; Diaz-Chavez, R.; Wanjiru, H.; Ogeya, M.; López, N. G.; Oduor, N.; Ogutu, P. C.; Da Silva, I. P.; Wambugu, A. C.; Ndufa, J.; Ochieng, P. A.; Gitau, J. K.; Muchiri, M.; Nyambati, R.; United Nations Environment Programme; Da Silva, Izael
dc.description.abstract: The following report, Sustainability of Sugarcane Bagasse Briquettes and Charcoal Value Chains in Kenya: Results and Recommendations from Implementation of the Global Bioenergy Partnership (GBEP) Indicators, assesses the current and future potential of Kenya’s bioenergy sector. It outlines the consequences of the widening gap between supply and demand for wood fuel, with the current supply not matching demand in various parts of the country.The report also illustrates key factors that can shape the long-term and periodic monitoring of the sector. Kenya Vision 2030 has identified energy as one of the enablers of the three pillars of its vision. The level and intensity of commercial energy use will be the key indicator of economic growth and development. Bioenergy, like other energy sources, will continue to play a role in both the traditional and commercial energy mix. Kenya’s Nationally Determined Contribution (NDC) includes four key climate change mitigation targets related to forestry and bioenergy: working towards 10 per cent tree cover of the land area of Kenya; promoting clean energy technologies to reduce overreliance on wood fuel; employing low-carbon and efficient transport systems; and using climate-smart agriculture (CSA) in line with the National CSA Framework.
dc.description: United Nations Environment Programme Report
2019-01-01T00:00:00ZPlanning algorithm for single wire earth return distribution networksDa Silva, I. P.Amelin, M.Hesamzadeh, M. R.Bakkabulindi,G.http://hdl.handle.net/11071/133522023-12-03T18:29:56Z2012-07-01T00:00:00Zdc.title: Planning algorithm for single wire earth return distribution networks
dc.contributor.author: Da Silva, I. P.; Amelin, M.; Hesamzadeh, M. R.; Bakkabulindi,G.
dc.description.abstract: Power flow in earth return distribution systems typically depends on geographical location and specific earth properties. The planning of such systems has to take into account different operational and safety constraints from conventional distribution systems. This work presents the mathematical modeling and planning of Single Wire Earth Return (SWER) power distribution networks. The SWER load flow is modeled and formulated as an optimization problem. Then by using a heuristic iterative procedure, a planning algorithm is developed for the SWER system. The developed procedure includes optimal feeder routing and overhead conductor selection for both primary and lateral feeders with load growth over several time periods. A 30 node test network extracted from a rural area in Uganda is used to test the algorithm's practical application to give reasonable and consistent results. The model presented can be used in planning SWER networks for areas which have previously not been electrified as well as determining suitable upgrades for existing SWER distribution feeders. The algorithm's mathematical modeling and simulations were done using the General Algebraic Modeling System (GAMS)
dc.description: Journal Article
2012-07-01T00:00:00ZInvestigation of solar water heating systems for industrial applications in Northern EthiopiaDa Silva, I. P.Kahsay, M. BCherkos, R.Da Silva, Izaelhttp://hdl.handle.net/11071/133512023-12-03T18:41:09Z2011-01-01T00:00:00Zdc.title: Investigation of solar water heating systems for industrial applications in Northern Ethiopia
dc.contributor.author: Da Silva, I. P.; Kahsay, M. B; Cherkos, R.; Da Silva, Izael
dc.description.abstract: Low temperature water heating for industrial process is one of the ideal applications for solar energy. The paper looks at an investigation of the feasibility of solar water heating systems for industrial applications in Northern Ethiopia. The study was conducted at four factories, namely, a tannery, a particleboard factory, a textile factory and an edible oil factory. The factories use hot water for different processes for the production of their products. The daily hot water consumption is high but most of the processes in the factories require low temperature hot water
dc.description: Full text
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