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Load Controller for a Stand Alone Variable Speed Wind Energy Conversion System with Energy Storage 带储能的独立式变速风能转换系统负荷控制器
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543145
D. Cloete, S. Chowdhury
{"title":"Load Controller for a Stand Alone Variable Speed Wind Energy Conversion System with Energy Storage","authors":"D. Cloete, S. Chowdhury","doi":"10.1109/PowerAfrica52236.2021.9543145","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543145","url":null,"abstract":"This paper reports on a load controller for a standalone wind power plant with storage. The controller incorporates a maximum power point tracking (MPPT) algorithm for always capturing maximum energy from wind flow. The load is modelled as a three-phase resistor and is interfaced with the variable speed wind turbine and permanent magnet synchronous generator (PMSG) through a diode bridge rectifier, DC-DC converters, and a three-phase voltage source inverter. Maximum power point tracking is implemented by varying the duty cycle of a boost converter with the changes in the DC-link power and voltage. The energy storage system comprises a lead-acid battery bank that stores excess energy and supplies the load when wind generation cannot sufficiently meet the load demand. The three-phase voltage source inverter converts DC voltage to AC and employs vector control to sustain a constant output voltage across the load. Modeling and simulation are performed in MATLAB/Simulink for varying wind speeds and loading scenarios. The simulation results demonstrated that the controller performs well under these conditions.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115704880","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
Economic Comparison of PV/Wind Hybrid Energy System with different Energy Storage Technologies 不同储能技术下光伏/风能混合能源系统的经济性比较
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543207
T. Ayodele, T. Mosetlhe, A. Yusuff, M. Ntombela, K. Moloi
{"title":"Economic Comparison of PV/Wind Hybrid Energy System with different Energy Storage Technologies","authors":"T. Ayodele, T. Mosetlhe, A. Yusuff, M. Ntombela, K. Moloi","doi":"10.1109/PowerAfrica52236.2021.9543207","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543207","url":null,"abstract":"In this paper, an economic comparison was performed for a PV/wind hybrid microgrid system with different energy storage technologies designed for a health clinic located in a rural community of Eastern Cape province of South Africa. The main aim of the study is to understand the influence of different storage technologies (i.e. hydrogen, pumped hydro storage and lithium-ion battery storage technologies) on the architecture of a microgrid and the possible effect on the economic viability of the microgrid. Some of the key results reveal that all the storage technologies are feasible to be used as a storage technology. However, microgrid architecture with lithium-ion battery technology is the most economically viable with the net present cost of $74, 609 and cost of energy of $0.847 while the architecture with hydrogen storage technology is the least attractive economically with a net present cost of $206,328 and cost of energy of $ 2.34.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115311292","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
Energy Quality impact with Electric vehicles insertion in Brazil 巴西电动汽车的普及对能源质量的影响
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543301
V. Lino, W. Camargo, Alberto Luiz Francato
{"title":"Energy Quality impact with Electric vehicles insertion in Brazil","authors":"V. Lino, W. Camargo, Alberto Luiz Francato","doi":"10.1109/PowerAfrica52236.2021.9543301","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543301","url":null,"abstract":"Nowadays, electric mobility has been the subject of several discussions in various segments, although in Brazil, the electric vehicles sector is not evolved in comparison to more developed countries such as in Europe, in the USA and Asian Powers. In Brazil, investments regarding to new technology are low and the infrastructure requested by it is not yet present, which is remarkable, since the number of charging points (recharging stations) is limited, as well as the acceptance of the electric vehicle at the national automotive market, so when the demand increase, that is expected as soon as the electrics vehicles are more often and accessible in the market, there will be several problems in the energy quality, mainly on the distribution system. The aim of this paper is to expose and analyze what would be the impacts generated by the insertion of electric vehicles in the Electric System, like energy quality.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132373477","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
Impact of designed line parameters on Distance protection - Investigation on a 110 kV Double Circuit Transmission Line Fault 线路设计参数对距离保护的影响——110千伏双回输电线路故障的研究
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543223
Anas Abdulkhader
{"title":"Impact of designed line parameters on Distance protection - Investigation on a 110 kV Double Circuit Transmission Line Fault","authors":"Anas Abdulkhader","doi":"10.1109/PowerAfrica52236.2021.9543223","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543223","url":null,"abstract":"Measuring the impedances in overhead lines and cables is absolutely essential for ensuring selectivity and accurate fault location by means of distance relays. This paper investigates a double-circuit line fault with nonselective tripping caused by the parameterization of the relay based on inaccurate/lack of knowledge of the line impedances. Analysis of the fault is based on the measured line impedances and the simulation/system-based testing using RelaySimTest. An appropriate procedure was adopted and documented to measure the line impedances of double circuit lines in a minimally invasive manner.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132471421","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
Evaluation of Linear Component Node Orchestration for IoT Clusters in Smart Grid Communication Networks 智能电网通信网络中物联网集群线性组件节点编排评估
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543443
K C OKAFOR, O. M. Longe
{"title":"Evaluation of Linear Component Node Orchestration for IoT Clusters in Smart Grid Communication Networks","authors":"K C OKAFOR, O. M. Longe","doi":"10.1109/PowerAfrica52236.2021.9543443","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543443","url":null,"abstract":"Linear Component node orchestration (LCNO) is a novel paradigm that focuses on the use of smart routing procedures to derive random connectivity among nodes in a Smart grid communication network (SGCN). It eliminates the limitations in distributed communication involving Machine to Machine interactions among edge nodes in the substations. To achieve the aims; first, the edge layer for data stream parameter collection (from both homogenous and heterogeneous sources) is automated. Second, homogeneous linear-like Internet of Things (IoT) clusters are introduced for modular deployment at the distribution network. Third, interface protection monitoring for linear-chain topology in SGCN is deployed. To study the effect of the LCNO for system resilience, a simple routing protocol (SRP) is compared with Power-Efficient Gathering in Sensor Information System (PEGASIS) and Low Energy Adaptive Clustering Hierarchy (LEACH). Quality of service (QoS) results show that SRP is more efficient for monitoring the frequency and voltage parameters.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132509173","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 Energy Management System for Disaster Resilience in Islanded Microgrid Networks 孤岛微电网抗灾能力能源管理系统
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543282
Samuel Kihembo Mumbere, Soichiro Matsumoto, Atsushi Fukuhara, A. Bedawy, Y. Sasaki, Y. Zoka, N. Yorino, Yoshiki Tanioka
{"title":"An Energy Management System for Disaster Resilience in Islanded Microgrid Networks","authors":"Samuel Kihembo Mumbere, Soichiro Matsumoto, Atsushi Fukuhara, A. Bedawy, Y. Sasaki, Y. Zoka, N. Yorino, Yoshiki Tanioka","doi":"10.1109/PowerAfrica52236.2021.9543282","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543282","url":null,"abstract":"As disasters continue to become common around the world, the reliability of power systems is increasingly becoming critical. Researchers continue to explore the inclusion of distributed energy resources (DERs), specifically smart microgrids, into traditional power system designs to improve their reliability. Smart microgrids possess characteristic advantages of energy storage, off-grid operation, and control flexibility. In this regard, we explore load shedding of noncritical loads as a solution to extend the uptime of a group of interconnected microgrids that have been islanded after a disaster. Load shedding and Photovoltaic (PV) Curtailment are implemented as an addition to our previously proposed energy management systems (EMS) for each prosumer (PR) in the network. The proposed method shows that the proposed control methods can prolong uptime in the interconnected off-grid network of microgrids","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131058545","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: 3
Sizing and Selection of Battery Energy Storage System for Time of Use Arbitrage in a Commercial Building in South Africa 南非某商业建筑使用时间套利的电池储能系统选型
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543436
T. Baloyi, S. Chowdhury
{"title":"Sizing and Selection of Battery Energy Storage System for Time of Use Arbitrage in a Commercial Building in South Africa","authors":"T. Baloyi, S. Chowdhury","doi":"10.1109/PowerAfrica52236.2021.9543436","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543436","url":null,"abstract":"This paper presents the optimization, sizing and selection of battery energy storage systems (BESS) for grid-connected solar PV systems in South Africa. BESS optimization was realized by minimizing the annual cost of BESS and then evaluating the savings in electricity cost when BESS is used for Time of Use (TOU) arbitrage. The study used power demand, energy consumption and energy cost data from a commercial building in South Africa with an already existing solar PV system but without BESS. An Objective Function to minimize the cost of BESS with its associated constraints was then formulated and solved in order to get the minimized annual cost of the BESS. The annual cost of BESS was used to determine the savings in electricity cost realized if BESS is used for TOU arbitrage value stream. It was found that the use of BESS does yield savings in electricity costs when BESS is used for TOU arbitrage with the degree of autonomy set at either three hours, two hours or five hours per day that is for morning peak, evening peak and both peaks combined, respectively. There was no saving realized when the degree of autonomy is set to 24 hours in the calculation of battery capacity. Lead-acid batteries presented the lowest BESS cost compared to Li-ion batteries. The results indicated that that BESS can be installed on grid-connected solar PV systems to take advantage of TOU arbitrage.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131712296","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
Adaptive Overcurrent Protection Scheme with Zonal Approach for a Stand-Alone Renewable-based Microgrid 独立可再生微电网分区自适应过流保护方案
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543357
M. Moshoeshoe, S. Chowdhury
{"title":"Adaptive Overcurrent Protection Scheme with Zonal Approach for a Stand-Alone Renewable-based Microgrid","authors":"M. Moshoeshoe, S. Chowdhury","doi":"10.1109/PowerAfrica52236.2021.9543357","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543357","url":null,"abstract":"This paper presents the design of an adaptive overcurrent protection scheme with a zonal approach for a standalone renewable-based microgrid with various generation capacity, generation type and loading conditions. Supply and loading conditions in the network are constantly monitored by a control system which in turn communicates with coordinated relays on each feeder in order to adapt to any changes in supply or loading conditions. DIgSILENT Powerfactory was used to design the microgrid and capture all nominal and overcurrent levels for all test cases and Matlab was used to implement the proposed protection scheme. After development, analysis and simulation, the resulting protection scheme proved to have the ability to maintain its functionality for all the tested loading and supply conditions.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126898055","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
Voltage Stability Index Based on Multi-bus Reactive Power Loading 基于多母线无功负载的电压稳定指标研究
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543435
P. Munyao, J. Agee, R. Tiako
{"title":"Voltage Stability Index Based on Multi-bus Reactive Power Loading","authors":"P. Munyao, J. Agee, R. Tiako","doi":"10.1109/PowerAfrica52236.2021.9543435","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543435","url":null,"abstract":"Voltage stability analysis provides an assessment of the weak, unstable or uncontrollable sections of the power system network that may pose a risk for future load growth due to unexpected voltage collapse. Different methods of determining susceptible buses have been demonstrated over the decades, with V-Q curves being used to determine the critical point and stable operating region of a particular load bus. However, the underlying mutual influences which result from how buses are interconnected, haven't been correlated directly to the voltage profile and stability of load buses. This paper aims to exploit the combined effect that interconnected load buses have on each other, under uniformly distributed multi-bus loading conditions and the conventional method of the sole bus loading analysis, to predict better the strength of a load bus by using a V-Q curve based index. This variable-state-based approach was compared with the inherent network structural-based method giving a broader scope of the system characteristics under various loading states.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125649855","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
End-of-Life Management of Power Generation Assets: Nigerian Perspective 发电资产报废管理:尼日利亚视角
2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543345
K. P. Eke
{"title":"End-of-Life Management of Power Generation Assets: Nigerian Perspective","authors":"K. P. Eke","doi":"10.1109/PowerAfrica52236.2021.9543345","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543345","url":null,"abstract":"25% by installed capacity of grid-connected power plants in Nigeria are already close to their end of life. This phase of asset life cycle is characterized by continuous and rapid increase in equipment failure rate (λ), maintenance cost and power generation/sales deferrals due to plant downtime. This phase corresponds to the positive slope of a bathtub curve. These factors make Asset End-Of-Life (EOL) expensive to finance. This is compounded by Nigeria's cost non-reflective electricity tariff, delayed invoice payments to market participants by the Nigerian Bulk Electricity Trading Plc (NBET) and the power sector's overall negative cash-flow. This paper examines the challenges associated with managing end-of-life phase of Nigeria's power generation assets; and proffers solutions to them. Market operators, investors, regulators and consumers will find the paper useful for managing their interests in Nigeria's power generation market.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126532732","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
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