{"title":"Fault investigation methods on power transmission line: A comparative study","authors":"C. Subramani, A. Jimoh, M. Sudheesh, I. Davidson","doi":"10.1109/POWERAFRICA.2016.7556578","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556578","url":null,"abstract":"In this paper, the authors have carried out fault investigation in Power Transmission Line using three different techniques: Simple impedance method, Travelling wave method and Wavelet Multi-Resolution Technique. Different realistic fault cases at different locations have been done but L-L fault is considered for this investigation. A two terminal 400kV transmission line fed by two generators model is simulated with MATLAB for all the three different techniques. The authors believe that the technique employed here is generally applicable to determine fault in any multi terminal transmission line.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125175793","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":"Methods and applications for electricity demand disaggregation in developing countries","authors":"D. Greenwood, N. Wade, P. Davison, Sam Duby","doi":"10.1109/POWERAFRICA.2016.7556567","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556567","url":null,"abstract":"Electricity demand disaggregation describes the identification of appliance level loads from aggregate power measurements. This topic is widely researched, but the majority of projects focus on grid connected customers with strong connections and many loads; however, there are numerous applications for disaggregation in the intelligent, off-grid systems emerging in developing countries. In this paper, we describe an established electricity demand disaggregation method, the Hidden Semi-Markov Model (HSMM), present results using this method to dissagregate demand data from a real microgrid in Kenya, and discuss applications for disaggregation in developing countries.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125343698","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 impact of Sawmill operations on power quality: Case study of Merensky Northern Timbers Sawmill Ltd","authors":"A. G. Raji, J. M. vanColler","doi":"10.1109/POWERAFRICA.2016.7556592","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556592","url":null,"abstract":"Sawmill loads are disturbing loads. When connected to a power system, they constitute sources of harmonics, voltage fluctuations and flicker. In this paper, measurements of power quality parameters carried out in a case study of MERENSKY Northern Timbers Sawmill Ltd at Tzaneen, Limpopo Province of South Africa are reported. The report indicates that, due to some mitigation measures implemented by the plant operator, Pst flicker levels were substantially in compliance with NRS 048-2 requirements. On the other hand, Plt values were found to be high. Two mathematical models were developed for the large multi-rip sawmill plant. First, a constant impedance model was developed from the measurements. Then, a third-order induction motor model was formulated. The models are suitable for use independently in simulation studies to determine rough equipment immunity and other specifications during the planning stages of supply networks to sawmills.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"2473 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131103776","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":"A smart grid based algorithm for improving energy efficiency of large scale cooperating distributed systems","authors":"B. Nleya, A. Mutsvangwa, M. Dewa","doi":"10.1109/POWERAFRICA.2016.7556560","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556560","url":null,"abstract":"A smart grid (SG) is a sophisticatedly integrated hybrid power generating system which allows bidirectional energy as well as management data exchanges. In this paper we look at improving energy efficiency in large scale cooperating power consuming as well as power generating systems. We discuss a clustered as well as hierarchical power scheduling algorithms that are geared towards optimizing the management of power tariffs, storage and distribution in a cooperative environment. From a generation perspective, solar intensity prediction is proposed for power generation forecasting and whereas from a power consumption perspective, we evaluate and model the power consumed by these distributed systems (consumers) and propose improving resource allocation, scheduling and network traffic management so as to make network and computing resources more power efficient.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127251732","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":"Mitigation of CO2 emissions by optimizing energy storage capacity","authors":"Michal Chudy, J. Mwaura","doi":"10.1109/POWERAFRICA.2016.7556620","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556620","url":null,"abstract":"With spreading of renewable energy in energy mix of national grids, the issue of high capacity and efficient energy storage is becoming very critical. A comprehensive model of South African power grid developed at the University of Pretoria is presented in this work. The model contains all notable power generators in the country. Mixed integer non-linear optimisation techniques are employed for unit commitments calculations. The Optimal size of storage will be calculated these optimisation methods. This work is unique as the optimisation was performed with CO2 emissions as the only objective variable. The main output of this work is estimation of the optimal size of energy storage required for renewable capacities planned in South Africa for 2030.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"773 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123890435","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":"Design and implementation of off-grid solar electricity supply for a rural Zambian medical facility","authors":"G. Jones, Daniel J. Rogers, J. Stevens, L. Thomas","doi":"10.1109/POWERAFRICA.2016.7556574","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556574","url":null,"abstract":"This paper presents the development of an off-grid photovoltaic energy supply in Chongwe District, Zambia, which delivers electricity to a health post and three supporting buildings. The system includes 23.3 square metres of polycrystalline silicon photovoltaic (PV) panel with a peak output of 3.4 kW, and 21.1 kWh of storage using absorbent glass mat (AGM) batteries. The design methodology for the original system, installed in 2012, along with that of a substantial upgrade in 2014, is discussed. Comprehensive system data from before and after the upgrade were recorded, over a period of fifteen months, allowing system performance to be analyzed in detail. The paper concludes with a reflection on the experience gained during the design and delivery of this project, which can be used as a model for the electrification of further health posts across Zambia and other parts of Africa.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127672363","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":"Creating solar communities as a way of mitigating Zambia's power (Energy) crisis","authors":"E. Zulu","doi":"10.1109/POWERAFRICA.2016.7556573","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556573","url":null,"abstract":"Summary form only given. Zambia Electricity Supply Corporation (ZESCO), which normally produces around 1950MW of power from its hydro power stations based mainly along the Zambezi and Kafue rivers, is the main power supplier in Zambia. This year the company has failed to generate enough power to meet the Zambian demand because of poor rainfall in the 2014/2015 rain season. It currently produces around 1200 MW. This has resulted in the company resorting to extensive load shedding of up to 12 hours in some areas to prevent total collapse of the power system. The impact of this is that, small to large scale businesses have reduced their production, a situation which has culminated into economic hardships. This paper endeavors to present a way to mitigate this problem. It advocates demand side renewable power generation using solar modules at domestic level to carter for the household loads. It also emphasizes that small scale farmers rearing chicken and watering crops using electrical power should adopt use of solar modules for these activities. This will help free the already constrained national utility grid. With high penetration of household and small scale farm photo-voltaic(PV) systems, it is possible to even reinforce the utility grid. During the day when the PV system produces power in excess of load requirements, the households and the small scale farmers can then fed power to the utility grid at a fee. It also proposes that in future, all new households should have a certain power generation capability before being connected to the national grid. This should be made law. This will help reduce the power deficit in future.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126737389","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":"Design considerations of the Katsina Wind Farm in Nigeria","authors":"Jonathan O. Okoronkwo, O. Ojo, I. Davidson","doi":"10.1109/POWERAFRICA.2016.7556611","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556611","url":null,"abstract":"Wind power is both an efficient and reliable form of clean source of renewable energy. It can be an excellent method of harnessing renewable energy from locations where there is availability of land. The Katsina Wind Farm (WF) project was designed to be a pilot project because it is the first WF in West Africa. The project covers 200 hectares (10,000m2/hectare) of land. The monthly average temperature at WF site is between 27°C and 31°C based on the metrological station in Katsina. The maximum measured temperature on site is about 40°C. This paper outlines some of the characteristics and layout of the wind farm.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132894699","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}
T. Ayodele, A. Ogunjuyigbe, S. M. Ogunmuyiwa, O. Ojo
{"title":"Determination of electrical energy use index for two selected nigerian food and beverages industries","authors":"T. Ayodele, A. Ogunjuyigbe, S. M. Ogunmuyiwa, O. Ojo","doi":"10.1109/POWERAFRICA.2016.7556565","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556565","url":null,"abstract":"This study evaluates the electrical energy use patterns of 2 Nigerian food and beverage industries (FBI) over a period of 4 years (2010-2013) with the aim of developing an index that measures the energy efficiency of producing a finished product. The data used for the study consist of monthly diesel consumption (liters), electricity consumption (kWh), the mass of finished product (kg and unit mass energy content of finished product). Some of the findings reveal that diesel generators account for 87% and 89% of electrical energy needs of industry A and B, respectively. This is in an effort to ensure uninterrupted power supply for production process. The average electrical energy use index for industry A is determined to be 0.70 while that of industry B is 0.76. These values indicate that neither of the industries efficiently utilized electrical energy for their production processes. The inefficient usage of electrical energy for finished product is attributed to the usage of inefficient electric motors, non-compliance to the usage of energy saving equipment and diesel leakage from generating sets.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134104706","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}
C. A. Guerrero, P. M. da Silveira, J. Carvalho, B. Bonatto, D. Q. Oliveira, M. Santos, D. Marujo, A. Zambroni, L. A. Felver, J. A. Oliveira, M. F. Braga
{"title":"A new software-in-the-loop strategy for real-time testing of a coordinated Volt/Var Control","authors":"C. A. Guerrero, P. M. da Silveira, J. Carvalho, B. Bonatto, D. Q. Oliveira, M. Santos, D. Marujo, A. Zambroni, L. A. Felver, J. A. Oliveira, M. F. Braga","doi":"10.1109/POWERAFRICA.2016.7556559","DOIUrl":"https://doi.org/10.1109/POWERAFRICA.2016.7556559","url":null,"abstract":"In this paper a new Software-in-the-Loop (SIL) strategy is proposed for real-time testing of Coordinated Volt/VAr Control (CVVC), through the use of the Real-Time Digital Simulator (RTDS) and Matlab® program. Such a strategy seeks to emulate, during the test, the interaction commonly established among the main layers of a Distribution Management System (DMS). To do so, a TCP/IP (Transmission Control Protocol/Internet Protocol)-based communication between the simulation module of the RTDS (RSCAD) and Matlab® is established. To prove the efficiency of the SIL strategy, an optimization technique based on Artificial Immune Systems is applied to deal with the problem of optimal CVVC in radial Distribution Networks (DNs) composed of multiple control equipment. Important aspects associated with the implementation of the test bed are discussed in this paper. Simulation results demonstrated that the proposed strategy is suited to analyzing the time domain behavior of CVVC designed for real-time operation in DNs.","PeriodicalId":177444,"journal":{"name":"2016 IEEE PES PowerAfrica","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117063171","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}