2017 IEEE PES PowerAfrica最新文献

{"title":"Application of statistical tools in power transformer FRA results interpretation: Transformer winding diagnosis based on frequency response analysis","authors":"G. U. Nnachi, A. Akumu, C. G. Richards, D. Nicolae","doi":"10.1109/POWERAFRICA.2017.7991193","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991193","url":null,"abstract":"In this paper, Frequency Response Analysis simulations of a three-phase transformer were conducted via Finite Element Analysis and Matlab software. The contribution of this work is the authenticity of the equivalent Simulink model in eliminating 50 Hz frequency, leaving the purely pulse signals. The results were further verified statistically using F-Test and T-Test statistical techniques. F-test and T-test are viewed among others as two major adopted statistical tools that give the exact and accurate condition of the transformer windings based on the concept of objective winding asymmetry. It was proven that two sets of FRA data when tested with F-test and T-test match as long as the windings are in good condition. They prove otherwise when any of the phases is faulty.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"116 1","pages":"16-22"},"PeriodicalIF":0.0,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73216112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asynchronous interconnection of the proposed East Africa Power Pool (EAPP)","authors":"M. Musau, N. Odero, C. Wekesa","doi":"10.1109/POWERAFRICA.2017.7991191","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991191","url":null,"abstract":"East Africa Power Pool (EAPP) is a proposed regional interconnection for centralizing energy resources and facilitating power wheeling between the Eastern Africa geographical areas. Synchronous tie lines have been used in the established interconnections so far. However, asynchronous interconnection is preferred since there high Renewable Energy (RE) penetration in the EAPP. HVDC technology, particularly multi terminal DC (MTDC) is a good example of such links as it provides loose coupling between the interconnected power systems. This has several economic, environmental and security-stability merits as compared to the traditional HVAC tie lines. The Kenya-Ethiopia HVDC Bipolar is supposed to provide a loose coupling between the two countries. The same technology can be reproduced in the EAPP so as to achieve a dynamic regional interconnection. Thus, a 10-Area system with 18 MTDC tie lines is considered where each area represents a Transmission System Operator (TSO) for each country. In this paper, a multi area multi objective economic dispatch (MAMODED) with RE and Emissions is formulated where MTDC constraints have been included for the first time in the EAPP. Review of EAPP and MAMODED with RE, merits of MTDC interconnection, RE penetration in EAPP, and MTDC tie line power flows are also presented.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"12 1","pages":"7-11"},"PeriodicalIF":0.0,"publicationDate":"2017-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78170938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emerging considerations of rural electrification infrastructure development in Africa","authors":"K. P. Eke","doi":"10.1109/POWERAFRICA.2017.7991213","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991213","url":null,"abstract":"Rural electrification infrastructure in Africa has remained under-developed and under-utilized even though rural economies have the potential to be the theatre of economic development of the continent. Most of the continent's abundant energy and mineral resources are located in their naturally occurring states in the rural areas. Despite Africa's huge energy resources, the electrification rate in the continent has remained low at forty-three per cent and is even much worse in the rural communities at eight and a half per cent. This paper examines the reasons for this trend from the Technical, Economic, Commercial, Operational and Political emerging considerations involved in rural electrification infrastructure development in Africa and also proffers solutions to them.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"120 1","pages":"138-142"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74726405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transforming the West African regional electricity market — Lessons and experiences","authors":"E. Agbodo, A. Maharaj, B. Adeyemo, I. Davidson","doi":"10.1109/POWERAFRICA.2017.7991223","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991223","url":null,"abstract":"This paper provides an overview and insight into the transformation of the West Africa Power Pool into a regional electricity market from a technical and socio-economic perspective. It summarizes efforts made to date, identifies and evaluates opportunities for improvement and proposes some considerations for future development. The balance of the paper presents key observations and issues affecting electricity markets in Africa and in particular the West African region.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"58 1","pages":"198-201"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78379614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational method for the charging time of supercapacitors","authors":"A. Guenoukpati, A. Salami, M. Kodjo, K. A. Dotche, K. Bedja","doi":"10.1109/POWERAFRICA.2017.7991221","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991221","url":null,"abstract":"This paper presents the modeling of the charging time constant of supercapacitors in a mathematical formulation by the use of Matlab Simulink tools. It also intends to encourage the students in control engineering to grab the extent of the Matlab Simulink in built application since it offers a virtual laboratory works.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"54 11","pages":"186-191"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72616441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of user participation capabilities in demand response programs for smart home applications","authors":"Ugonna Anuebunwa, H. Rajamani, P. Pillai, O. Okpako","doi":"10.1109/POWERAFRICA.2017.7991273","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991273","url":null,"abstract":"A considerable aspect of smart home design and applications require active user participation especially in demand response programs. Some users due to their behavior and conditions might participate more actively than others. This implies that if a third party organization wishes to invest in demand response programs and smart energy systems, there will be a need to evaluate user response capabilities in order to ensure effective engagements with consumer as well as grid performance. In this paper the capabilities of user participation in demand response programs are evaluated using statistical approach and fuzzy logic methodologies. This is achieved by using the component of user behavioral indices which is contained in the historical load profiles of the consumer as the primary input data, as well as the dynamic pricing profile as a secondary input. The defuzzified results show that depending on the fuzzy rules set, an overall user participation index is obtainable which represents the forecasted user participation capabilities in demand response program.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"C-28 1","pages":"483-488"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84438058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of integration of photovoltaic generation on South Africa grid","authors":"Nhamo Dhlamini, S. Daniel Chowdhury","doi":"10.1109/POWERAFRICA.2017.7991265","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991265","url":null,"abstract":"Photovoltaic (PV) has become the alternative form of clean energy generation world-wide. Many power utilities have embraced this alternative source of power generation and integrating the power to the grid. This research study provides insights on the effects of high levels of Photovoltaic (PV) generation integration on the utility grid with particular emphasis on the South African utility grid. The trend and growth of PV generation in South Africa is explained. The Equivalent Newton-Raphson Circuit (ENRC) is used to study the characteristics of PV generation. Applying this model enables electromagnetic transient studies with the application of electromagnetic software to be performed. The effect of changes in irradiation and temperature on the voltage and power output is investigated. In order to simulate on a larger scale an aggregated PV generator model is used to test the response on the power network with incremental integration levels of PV generation. Simulation results show that the PV power and voltage injected into the grid is influenced by the pattern of the irradiation. The study will assist system operators and planners with the necessary tools and processes in the management of the grid as the grid connected PV generation is anticipated to grow in South Africa.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"79 1","pages":"439-444"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76658448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Powering Africa through shared solar energy","authors":"Eyram A. Adadevoh","doi":"10.1109/PowerAfrica.2017.7991290","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2017.7991290","url":null,"abstract":"Africa's future is bright. Amid complex issues surrounding poverty, illiteracy, unemployment and energy deficiency, to name a few, the continent is also brimming with eager entrepreneurs and investors looking to take financial advantage of untapped sectors or under-fulfilled development needs. One such opportunity lies within shared solar energy. Solar energy has already proven itself to be a viable solution for meeting the electrification requirements of remote off-grid communities, as well as for connected consumers experiencing intermittent power supply. Communities throughout Sub-Saharan Africa have already benefitted from personal home and business solar installations, to solar powered devices employing rechargeable batteries and exploiting the over 3000 hours of sunshine available in some countries annually. Further, shared solar offers the added benefit of greater access and affordability to solar power for those who otherwise may not be eligible to harness it, either due to cost or the improper positioning of rooftops. Shared solar allows individuals (known as subscribers) to own affordable interests in an off-site photovoltaic system that either feeds into the common grid, or acting as a micro-grid, directly supplies their homes and businesses. This paper explores examples of shared solar energy from the United States, as well as examples of various solar power deployments from some African countries, to make a case for the viability of shared solar as a solution to alleviate the energy privation that challenges Africa's industrialization. This paper also discusses the gaps in current legislation for many Sub-Saharan countries, using the example of Ghana, and presents the further steps required to close gaps in the legal framework and promote shared solar systems. Contractual considerations for a shared solar scheme are addressed to enhance readers' understanding regarding the complexity of legal mechanisms needed to support this renewables solution. Finally, readers are urged that political will and advocacy by proponents is required for shared solar to become a reality. As Africa's best option to meeting gaping power needs in the short to long term, the discussion on shared solar will only augment in the near future. Hopefully, there will also be matching action.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"77 1","pages":"577-583"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83862929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Communication network modeling for real-time HIL power system protection test bench","authors":"C. M. Adrah, Ø. Kure, Z. Liu, H. K. H⊘idalen","doi":"10.1109/POWERAFRICA.2017.7991240","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991240","url":null,"abstract":"The aim of this paper is to present a communication network emulator based hardware-in-the-loop (HIL) real time test bench. The emulator is used together with Opal-RT simulator to build up the test bench for testing of power system protection applications. The emulator enables us to model and vary new network properties and communication services that can have effect on protection system applications. With the aid of power system protection testing based on IEC 61850, this paper demonstrates how this test bench can be set up. Case studies of how the network emulator can be used to model communication properties and how it has satisfactory performance comparable to practical network switches are presented and discussed. In addition, the flexibility and capabilities of the emulator switch on implementation of router functions for management and control to support IEC 61850 Ethernet network communication have been examined.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"86 1","pages":"295-300"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90052407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taming the total harmonic distortion on the 132kV Arlington Traction Station","authors":"C. Nel, O. Ajeigbe, S. Daniel Chowdhury","doi":"10.1109/POWERAFRICA.2017.7991285","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2017.7991285","url":null,"abstract":"The 132kV Arlington Traction Station is fed from the krooonstad Switch Station. The 132kV Arlington network is further broken down into 22kV feeders to supply rural substations like Steynsrus, Goedehoop and Klippan which are islanded networks without back feeds. These activities resulted in harmonic generations. A study conducted on the network quality of the 132kV network by the Eskom proved that the Total Harmonic Distortion (THD) of the Arlington traction network was above the 4% limit for HV and EHV networks as stipulated by NRS048 — 2007. This paper, therefore, proffers three strategies, the harmonic filtering, 12 or 18 pulses rectifiers and phase shifting transformer, to mitigate the harmonics generated within the network. Phase shifting transformer performs better in terms of technical effectiveness and financial simplicity. Also, the paper proposes the installation of 1×10MVA; 22kV substation to ensure a ring feed on the network and allows future development.","PeriodicalId":6601,"journal":{"name":"2017 IEEE PES PowerAfrica","volume":"12 1","pages":"550-554"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80748300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}