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Flashover Voltage Variations of Glass and Porcelain Insulators with Different Contaminants 不同污染物对玻璃和瓷绝缘子闪络电压的影响
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905277
M. G. Gebremichael, Jean Marie V. Bikorimana, J. Desmet
{"title":"Flashover Voltage Variations of Glass and Porcelain Insulators with Different Contaminants","authors":"M. G. Gebremichael, Jean Marie V. Bikorimana, J. Desmet","doi":"10.1109/PowerAfrica53997.2022.9905277","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905277","url":null,"abstract":"The performance of insulators when exposed to pollution is a very critical issue which highly affects the external insulation design of the power transmission lines and stations. This paper deals with investigation of the operating conditions of porcelain and glass insulators under artificially contaminated cases. The level of contamination on the surface of the insulator is represented by Equivalent Salt Deposit Density (ESDD). In the laboratory, three types of salts with different combinations were used for studying the correlation between the flashover voltage (FOV) and ESDD of the suspension insulators which are polluted. The results indicate that as far as the insulators are dry, pollution alone will not cause a significant problem. It is found that dry and wet flashover voltage of standard glass insulator is 4.14% to 13.95% and 4.22% to 16.54% respectively, reduced as compared to standard porcelain insulator under the contamination of salt (NaCl+CaO).","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125501909","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}
引用次数: 1
Performance Analysis of DSTATCOM in Distribution Network for Mitigation of Harmonics 配电网DSTATCOM减谐波性能分析
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905366
Urbanus Mwanzia Ngei, Peter Musau Moses
{"title":"Performance Analysis of DSTATCOM in Distribution Network for Mitigation of Harmonics","authors":"Urbanus Mwanzia Ngei, Peter Musau Moses","doi":"10.1109/PowerAfrica53997.2022.9905366","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905366","url":null,"abstract":"Power Quality (PQ) has been a subject of discussion in the recent years. Modern distribution systems experience different PQ issues resulting from the different types of loads connected to the system. In this paper, Distribution Static Compensator (DSTATCOM) is applied to reduce harmonics resulting from different loads. DSTATCOM is implemented using Voltage Source Converter (VSC). Synchronous Reference Frame (SRF) technique is proposed for the generation of switching pulses for the DSTATCOM. The power system with DSTATCOM is compared with system without DSTATCOM. The compensator under the proposed controller proofs to be effective as the Total Harmonic Distortion (THD) in system voltage waveform is reduced from 6.66% to 0.06%.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125504368","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}
引用次数: 0
Static Security Assessment of the Kenyan Power System Using Contingency Analysis of Newton Raphson Approach 基于牛顿-拉夫森方法的肯尼亚电力系统静态安全评估
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905265
Chepkemoi Janeth, P. Musau, R. Kivindu
{"title":"Static Security Assessment of the Kenyan Power System Using Contingency Analysis of Newton Raphson Approach","authors":"Chepkemoi Janeth, P. Musau, R. Kivindu","doi":"10.1109/PowerAfrica53997.2022.9905265","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905265","url":null,"abstract":"This paper aims to evaluate the static security of the Kenyan Power System using Contingency Analysis (CA) and offer recommendations to mitigate the vulnerabilities of the power system. To achieve this, the System was modelled into the equivalent IEEE -39 Bus System and a CA done for different operating scenarios factoring in generators and transmission lines and considering an outage level of (N-1) using DIgSILENT Power Factory software. Newton Raphson (NR) Method was used to perform the CA since it was able to give information on the reactive energy flows and the bus voltages in the system. The component loading was between 80 -90% which operated closer to their loading limit thus limiting the load expansion and ability to withstand loading in case of a contingency. The bus voltages before CA was done ranged from 0.99 p.u. to 1.02 p.u and a loss of transmission line caused them to drop to as low as 0.6 p.u due to a decrease of reactive power injection. Recommendations to correct these violations without load shedding have been suggested to enable the system handle an outage level of(N-1).","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"188 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133524065","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}
引用次数: 0
Power Electronic Converter Control Emulating Synchronous Machine Characteristics for Renewable Energy Integration 电力电子变换器控制仿真同步电机特性的可再生能源集成
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905349
Etornam Komla Ahorsu, Chinenye Chibueze Vincent, Odei Kelvin Mireku, F. Effah
{"title":"Power Electronic Converter Control Emulating Synchronous Machine Characteristics for Renewable Energy Integration","authors":"Etornam Komla Ahorsu, Chinenye Chibueze Vincent, Odei Kelvin Mireku, F. Effah","doi":"10.1109/PowerAfrica53997.2022.9905349","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905349","url":null,"abstract":"The integration of distributed energy resources (DER) generation units based on renewable energy systems into the power system is going on at an unprecedented rate in both bulk power systems and distribution systems globally. However, as the penetration of DER renewables in the power system increases, the system inertia will decline leading to stability issues. As a result, improved converter control methods are required to ensure the high penetration of DERs into the existing power system will not jeopardize the future smart grid. Given that the synchronous generator (SG) has been the bedrock of stable power system operation for over a century, it is desirable for these converter control schemes to emulate the dynamics of the synchronous generator. This idea connotes the virtual synchronous generator (VSG) concept. This paper highlights key findings from recent publications with regard to the VSG concept, by identifying strengths and weaknesses. The inadequacies in some of these literatures are then addressed. A study on the synchronous generator is presented in order to better understand how it controls essential grid parameters. A control technique for an inverter to emulate the SG’s droop control and inertia property is then proposed. For performance evaluation, this control technique is simulated in MATLAB/Simulink using closed-loop control of the inverter.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116436949","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}
引用次数: 0
Economic and environmental evaluation of landfill gas to energy technology for Lesotho selected cities 对莱索托选定城市垃圾填埋气转化为能源技术的经济和环境评价
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905293
T. Sechoala, O. Popoola, T. Ayodele
{"title":"Economic and environmental evaluation of landfill gas to energy technology for Lesotho selected cities","authors":"T. Sechoala, O. Popoola, T. Ayodele","doi":"10.1109/PowerAfrica53997.2022.9905293","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905293","url":null,"abstract":"This study examined the economic viability and environmental benefits of implementing Landfill gas to energy (LFGTE) technology in selected districts of Lesotho. The economic assessment was performed using net present value (NPV), levelised cost of energy (LCOE), and total life cycle cost (TLCC), while the environmental impact was evaluated using the life cycle assessment (LCA) technique. The key finding was that over 25-years (2020-2045), the methane yield is 47630296 – 134963406 cubic meters. Moreover, the electricity generation ranges from 119 – 315MWh/year. Economically, the results demonstrated that LFGTE technology is feasible, as evidenced by their positive NPV of 218081 US dollars and the LCOE of 0.221 USD/kWh. In terms of environmental benefits, the results show that LFGTE can reduce global warming potential by 79%. This paper aims to provide the government and investors with reliable information to make informed decisions regarding the costs, performance, and global impact of waste-to-energy technology.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128278529","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}
引用次数: 0
Speed Performance Enhancement and Analysis of a Three Phase Induction Motor Driving a Pump Load using Vector Control Technique 基于矢量控制技术的三相异步电机驱动泵负载速度性能提升与分析
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905269
A. T. Umoette, O. Okoro, I. Davidson
{"title":"Speed Performance Enhancement and Analysis of a Three Phase Induction Motor Driving a Pump Load using Vector Control Technique","authors":"A. T. Umoette, O. Okoro, I. Davidson","doi":"10.1109/PowerAfrica53997.2022.9905269","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905269","url":null,"abstract":"Speed control of an induction motor driving a pump load using vector control technique with proportional integral derivative controller, fuzzy logic controller and hybrid of proportional integral derivative fuzzy logic controllers is presented in this paper. The induction motor drive was designed and simulated with these controllers using MATLAB/Simulink software package. The performance of the induction motor using proportional integral derivative(PID) controller, fuzzy logic controller (FLC) and hybrid controller (FLC-PID) on this load was studied and compared.steady state error of PID, FLC, and FLCPID are 0.5rad/sec, 0.5rad/sec, and 0,1rad/sec respectively, while the undershoot are also respectively 20%, 6% and 4%.FLC-PID further gives arise and settling time of 0.1sec and 0.05sec respectively. From the results obtained, the hybrid controller provides a far more superior performance in enhancing the speed performance of the induction motor.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134095437","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}
引用次数: 1
Modeling and Performance Analysis of an Automatic Voltage Regulator (AVR) using Model Predictive Controller (MPC) 基于模型预测控制器(MPC)的自动调压器(AVR)建模与性能分析
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905313
N. Mazibuko, K. T. Akindeji, G. C. Sharma
{"title":"Modeling and Performance Analysis of an Automatic Voltage Regulator (AVR) using Model Predictive Controller (MPC)","authors":"N. Mazibuko, K. T. Akindeji, G. C. Sharma","doi":"10.1109/PowerAfrica53997.2022.9905313","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905313","url":null,"abstract":"This paper demonstrates the application of MPC to improve the dynamic performance of an AVR. To observe the performance of an AVR when the terminal voltage of a generator deviates from its normal voltage, its transfer function is mathematically modeled and simulated. Thereafter a PID controller is introduced to enhance the system’s response after it has experienced voltage disturbances. The final model is an MPC-based AVR. The performance of these models is analyzed and compared critically for implementation on AVR systems and maintaining voltage stability The analysis of performance is conducted using response time, Peak voltage, and percentage overshoot as well as performance indices. The results are evaluated to show one of the feasible designs to maintain the constant terminal voltage of the AVR. The transient response of an MPC-based AVR has proven to be the best performing AVR system.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"30 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132760697","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}
引用次数: 1
Development of Dielectric Polymer Nanocomposites with Improved Energy Storage Capacity 具有改进储能能力的介电聚合物纳米复合材料的研制
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905262
U. O. Uyor, P. Popoola, O. Popoola
{"title":"Development of Dielectric Polymer Nanocomposites with Improved Energy Storage Capacity","authors":"U. O. Uyor, P. Popoola, O. Popoola","doi":"10.1109/PowerAfrica53997.2022.9905262","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905262","url":null,"abstract":"This study presents enhancement in the energy storage density and dielectric properties of polypropylene (PP) based dielectric nanocomposites for energy-power application. Although conductive nanomaterials such as carbon nanotubes (CNTs) have shown significant potential in improving the dielectric constant of polymeric materials, they often show high energy loss and low voltage endurance. Therefore, the contribution of this study is to address these challenges by decorating CNTs with insulative barium titanate (BT) for the development of PP nanocomposites with improved energy storage density. The dielectric nanomaterials were developed by solution and melt mixing using the CNTs decorated BT (BT@CNTs) and PP matrix. The developed dielectric nanocomposites showed significant enhancement in the energy storage capacity and dielectric properties. Where about 142.9% increase in energy density was recorded. This was attributed to the formation of microcapacitors and improved interfacial polarization in the polymer matrix offered by the presence of the nanoparticles.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122216190","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}
引用次数: 0
The Nexus between Smart Mobility Digitization and Carbon Neutrality through Blockchain Technology 通过区块链技术实现智能移动数字化与碳中和之间的联系
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905371
Allan Kweli
{"title":"The Nexus between Smart Mobility Digitization and Carbon Neutrality through Blockchain Technology","authors":"Allan Kweli","doi":"10.1109/PowerAfrica53997.2022.9905371","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905371","url":null,"abstract":"The digitalization of mobility users will transform them from a B2C to a B2B demographic through leveraging their digitized profiles. This digital transformation of their (mobility consumers) data ensures necessary infrastructure, interfaces and eco-systems are built and maintained in an efficient and sustainable way. The nexus of smart mobility digitalization is essential in realizing sustained growth opportunities in both businesses and personal lives, this is further advanced by blockchain technology that enables peer-to-peer trade of goods and services.","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060390","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}
引用次数: 0
Reliability and Security Analysis of The Southern Africa Power Pool Regional Grid 南部非洲电力联营区域电网可靠性与安全性分析
2022 IEEE PES/IAS PowerAfrica Pub Date : 2022-08-22 DOI: 10.1109/PowerAfrica53997.2022.9905389
N. W. Ndlela, I. Davidson
{"title":"Reliability and Security Analysis of The Southern Africa Power Pool Regional Grid","authors":"N. W. Ndlela, I. Davidson","doi":"10.1109/PowerAfrica53997.2022.9905389","DOIUrl":"https://doi.org/10.1109/PowerAfrica53997.2022.9905389","url":null,"abstract":"Over the last decade, Southern Africa has experienced power outages. This is due to insufficient electrical power supply systems, as well as load development in areas that were not sufficiently planned for. The Southern African countries can have a reliable, sustainable, and efficient electrical power grid with the use of power interconnections to exchange power. The primary difficulty with the present grid is to generate electricity using the old electrical infrastructure while also serving loads inside national borders. Most Southern Africa interconnections were implemented in 1995, after the formation of the Southern African Power Pool (SAPP). It was discovered that when electricity interconnection grows larger, the network system becomes more complex. Additionally, power connectors may encounter issues with frequency and voltage control. Numerous Southern African countries are unable to fulfill peak demand within their borders due to population ngrowth and aging infrastructure, resulting in electrical shortages. This article discusses the results on how to improve grid reliability by controlling voltages with a static var compensator. The remainder of the study discusses an efficient technique for optimizing the current SAPP power network through the use of High Voltage Direct Current Line Commutated Converter (HVDC-LCC) links and as a component of the Flexible AC Transmission System (FACTS).","PeriodicalId":371237,"journal":{"name":"2022 IEEE PES/IAS PowerAfrica","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127690799","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}
引用次数: 1
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