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Fast Frequency Control in Multi-Terminal DC Networks 多终端直流网络中的快速频率控制
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219868
B. O. Ojwang, P. Musau, B. Gathuita
{"title":"Fast Frequency Control in Multi-Terminal DC Networks","authors":"B. O. Ojwang, P. Musau, B. Gathuita","doi":"10.1109/PowerAfrica49420.2020.9219868","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219868","url":null,"abstract":"This paper analyzed the frequency support characteristics of multiterminal direct current (MTDC) networks based on voltage source converter technology using the active power transferred from wind farm turbines and other ac systems as recovery power. A control scheme for Multi-Terminal – High Voltage Direct Current (MT-HVDC) to allow redistribution of active power, based on the idea of “power balance” is proposed. The goal of the paper was to ensure frequency deviations to be very minimal and to maintain the frequency around its rated value under normal conditions in the Multiterminal DC section. The control scheme uses droop controllers that were designed through formulation, in order to transfer the recovery power from wind farms to the main grid system which prevented a formation of frequency dips in the AC grid terminals and the entire MTDC system.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123052933","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
Regional Energy Supply Index (RESI): Using Open Source Data To Monitor Electricity Reliability Across Sub-Saharan Africa 区域能源供应指数(RESI):使用开源数据监测撒哈拉以南非洲地区的电力可靠性
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219864
M. Kitetu, Alois Mbutura
{"title":"Regional Energy Supply Index (RESI): Using Open Source Data To Monitor Electricity Reliability Across Sub-Saharan Africa","authors":"M. Kitetu, Alois Mbutura","doi":"10.1109/PowerAfrica49420.2020.9219864","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219864","url":null,"abstract":"There is a limited body of knowledge on the power quality issues affecting micro, small and medium enterprises (MSMEs) in Africa. Power quality monitoring studies in the past have previously focused on larger formal companies and have mostly relied on surveys to collect data. The purpose of this paper is to introduce the Regional Electricity Supply Index (RESI) that seeks to standardize the collection and real-time monitoring of power supply to MSMEs across Sub-Saharan Africa.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124264605","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
Fault Diagnosis of Power Transformers Using Duval Triangle 基于Duval三角的电力变压器故障诊断
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219802
Thembi U. Mawelela, A. Nnachi, A. Akumu, B. Abe
{"title":"Fault Diagnosis of Power Transformers Using Duval Triangle","authors":"Thembi U. Mawelela, A. Nnachi, A. Akumu, B. Abe","doi":"10.1109/PowerAfrica49420.2020.9219802","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219802","url":null,"abstract":"Timely incipient fault identification in power transformers plays a very important role in improving transformer maintenance. Dissolved gas analysis (DGA) interpretation is a successful technique to detect incipient faults in power transformers. In this paper, dissolved gas analysis interpretation using Duval triangle technique is used to identify the type of faults in ten oil-immersed power transformers. The evaluation is based on the DGA data obtained from oil samples of the transformers and MATLAB program of Duval triangle developed. The results show that thermal faults were predominant in all the transformers.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115025761","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: 4
Application of occupancy-interlinked inhabitant behavior variables for improved energy and load profiles modeling 居住者行为变量在改进能源和负荷剖面建模中的应用
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219940
Agnes Ramokone, O. Popoola, A. Awelewa
{"title":"Application of occupancy-interlinked inhabitant behavior variables for improved energy and load profiles modeling","authors":"Agnes Ramokone, O. Popoola, A. Awelewa","doi":"10.1109/PowerAfrica49420.2020.9219940","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219940","url":null,"abstract":"Most simulation tools replicate the deterministic physical behavior of households particularly in energy load with repeated typical patterns of occupants' activities and occupancy without reproducing the active occupancy and occupants' interactions within such households. In so doing, this imparts peak demand/energy inaccurate information as encountered worldwide and the exaggerated energy savings estimation undertaken by government and utilities. This study entails the performance assessment of an ANN-based approach with the application of occupancy-interlinked inhabitant behavior variables in residential households. The application of such variables reinforces the ANN model to handle uncertainty and volatility of data to ascertain adroit forecasting of energy load profiles. The model produced a good coefficient of determination ($R^{2}$) and correlation coefficient ($r$). This model is projected to contribute mostly to energy load profile modeling, energy, utilities and measurement, and verification exercise.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121979764","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
Hybrid Solar PV-Wind Generation System Coordination Control and Optimization of Battery Energy Storage System for Rural Electrification 农村电气化电池储能系统的协调控制与优化
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219890
Irene Masenge, F. Mwasilu
{"title":"Hybrid Solar PV-Wind Generation System Coordination Control and Optimization of Battery Energy Storage System for Rural Electrification","authors":"Irene Masenge, F. Mwasilu","doi":"10.1109/PowerAfrica49420.2020.9219890","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219890","url":null,"abstract":"The scarcity of electric power grid network in rural areas has made hybrid power generation from renewable energy sources (RESs) such as solar photovoltaic (PV) and wind inevitable. Reliable power supply from these RESs necessitates deployment of the large size energy storage system (ESS) to meet load demands that entails high investment cost. To reduce the ESS requirements, the optimal hybrid system design is vital. Effective reduction of system's cost is accomplished by optimizing the battery ESS. This paper proposes modeling and coordination control of hybrid solar PV-wind power generation system together with optimal BESS using Mixed Integer Linear Programming (MILP). The proposed scheme is designed with the objective of maintaining power flow between DC-AC buses by guaranteeing constant voltage and system frequency at the Point of Common Coupling (PCC). Simulation results obtained on MATLAB/Simulink confirms excellent performance of the proposed scheme.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124377341","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: 4
Gender mediated optimal multivariate electricity load management model 性别介导的最优多元电力负荷管理模型
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219796
Godwin Norense Osarumwense Asemota, N. Ijumba
{"title":"Gender mediated optimal multivariate electricity load management model","authors":"Godwin Norense Osarumwense Asemota, N. Ijumba","doi":"10.1109/PowerAfrica49420.2020.9219796","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219796","url":null,"abstract":"Electricity load management embraces optimal power generation, transmission, distribution and utilisation, while demand-side management considers electricity consumption after the meter. Multivariate analysis uses Wilks' lambda, Pillai's trace, Hotelling's trace and Roy's largest eigenvalue to obtain multidimensional additive linear equations. A load management questionnaire having 54 predictors was randomly distributed to around 300 residents in a Windhoek suburb. The 127 questionnaire responses were analysed using statistical package for social sciences. Results indicate there was no statistical difference between predictors. Low Wilks' lambda values show substantial differences exist across gender in attitude towards optimal electricity load management and females were less likely to use electricity optimally. It is recommended for least costs and minimal resources deployment in power utilities that, the female gender is sensitised, encouraged and urged to adopt optimal multivariate electricity load management strategies proposed in this study for affordable and sustainable electricity generation, supply, utilisation, growth and overall development.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124082501","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
An Objective Review of Erection Methods for Overhead Line Towers Devoid of Cranes 无起重机架空线塔架架设方法综述
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219947
B. Jacobs, D. Desai, L. du Plessis
{"title":"An Objective Review of Erection Methods for Overhead Line Towers Devoid of Cranes","authors":"B. Jacobs, D. Desai, L. du Plessis","doi":"10.1109/PowerAfrica49420.2020.9219947","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219947","url":null,"abstract":"Overhead power lines make use of a number of different structures to support the conductors ranging from self-supported, guyed towers, poles and other types. The construction of these lines are costly and the construction techniques utilised differ. Consequently, the mobile crane has established itself as a popular choice for the erection of these structures unfortunately with a significant cost. Therefore, alternative and more economical erection methods are reviewed in this paper with specific emphasis on gin poles and winches but also includes novel methods yet to be implemented like air cushions and a degree of automation for lifting guyed V-towers. Also, different lifting configurations are objectively compared and selection of the most suitable method to achieve this is undertaken. The work presented here is part of a larger study involving the development of a numerical tool for the safe erection of guyed V-towers devoid of cranes.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128012288","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
Optimal Load Shedding Scheme for a Model Renewable Energy Micro-Grid 模型可再生能源微电网的最优减载方案
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219902
Paul Muia Musyoka, P. Musau, A. Nyete
{"title":"Optimal Load Shedding Scheme for a Model Renewable Energy Micro-Grid","authors":"Paul Muia Musyoka, P. Musau, A. Nyete","doi":"10.1109/PowerAfrica49420.2020.9219902","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219902","url":null,"abstract":"Optimization of demand control in renewable energy micro-grids involves developing load shedding schemes and searching for the most optimum. With climate change campaign in favor of renewable energy micro-grids or integration to national grids, the stability of the systems becomes more unpredictable. Its therefore justified, technically and economically, to optimize both unit commitment plans to track the load curve closely and design load-shedding schemes that attain the voltage and frequency limits, while retaining maximum load on the grid. The study shows that through load-shedding, renewable energy micro-grids can be operated in the stable state at the expense of loads during times of severe power imbalances. Optimization of the load-shedding using PSO-GA technique ensure optimum amount of load is shed from the grid with each possible load shedding scheme getting evaluated first and selection of most effective scheme with priority for loads is accomplished.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128049994","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: 2
Linear Quadratic Regulator Technique for Optimal Load Frequency Controller Design of Interconnected Linear Power Systems 基于线性二次型调整技术的互联线性电力系统最优负荷频率控制器设计
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219887
P. Gbadega, K. Akindeji
{"title":"Linear Quadratic Regulator Technique for Optimal Load Frequency Controller Design of Interconnected Linear Power Systems","authors":"P. Gbadega, K. Akindeji","doi":"10.1109/PowerAfrica49420.2020.9219887","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219887","url":null,"abstract":"Frequency is a significant criterion for the reliability of large-scale multi-area power systems. Active power balance and steady frequency are necessary to provide stability for the interconnected power system. It is interesting to note that frequency relies on active power balance. Therefore, in order to enhance the reliability of the power networks, a load frequency control (LFC) system must be designed to control the power generation and the active power at the tie lines. In this paper, a subset of classical control theory regarded as an optimal control concept was utilized to design controls for the complex power systems by minimizing a performance index based on the system variables. The goal of optimal regulator design is to determine the optimal control law of a two-area power system that can shift the system from an initial state to the final state in such a way that a given performance index is significantly mitigated. The performance indicator is chosen to offer the best possible trade-off between performance and control costs. In the optimal control method used in this paper, a quadratic performance index is used, and it is based on minimum energy criteria and minimal error. The MATLAB / Simulink environment was used to simulate the overall system structure.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131950384","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: 9
Review of Battery Management Strategy in Hybrid Lead-Acid-Lithium-Ion Energy Storage System for Transport Vehicles 运输车辆铅酸-锂离子混合储能系统电池管理策略综述
2020 IEEE PES/IAS PowerAfrica Pub Date : 2020-08-01 DOI: 10.1109/PowerAfrica49420.2020.9219966
Andre T. Puati Zau, S. Chowdhury, T. Olwal
{"title":"Review of Battery Management Strategy in Hybrid Lead-Acid-Lithium-Ion Energy Storage System for Transport Vehicles","authors":"Andre T. Puati Zau, S. Chowdhury, T. Olwal","doi":"10.1109/PowerAfrica49420.2020.9219966","DOIUrl":"https://doi.org/10.1109/PowerAfrica49420.2020.9219966","url":null,"abstract":"Currently, Lead-Acid Batteries (LABs) are predominantly used in Transport Vehicles (TVs) for starting automotive engines due to its availability and low cost. The batteries in Internal Combustion Engine Vehicles must be able to satisfy the Starter-Light-Ignition. The electronics functions are replacing mechanical technology; thus, it increases the load demand in TVs. Increase for load demand in TVs, LABs are failing to meet high transient and energy density. The LABs have been subjected to deep discharges, which in turn causes batteries' stress, consequently reducing their lifespan. Therefore, there is a need on LABs-TVs' performance improvement in terms of storage capacity and lifespan. Therefore, the purpose of the article is to do review on developing a Hybrid Lead-acid/Lithium-ion Energy Storage System with Battery Management Strategy in TVs to reduce stress in current LABs and improve their capacity and lifespan of LABs without changing the current chemical composition of the batteries.","PeriodicalId":325937,"journal":{"name":"2020 IEEE PES/IAS PowerAfrica","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130132575","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: 2
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