2021 IEEE PES/IAS PowerAfrica最新文献_第8页

Implementing Extreme Gradient Boosting (XGBoost) Algorithm in Predicting Solar Irradiance 实现极端梯度增强(XGBoost)算法预测太阳辐照度

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543159

Chibuzor N Obiora, Ahmed Ali, Ali N. Hasan

{"title":"Implementing Extreme Gradient Boosting (XGBoost) Algorithm in Predicting Solar Irradiance","authors":"Chibuzor N Obiora, Ahmed Ali, Ali N. Hasan","doi":"10.1109/PowerAfrica52236.2021.9543159","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543159","url":null,"abstract":"Globally, the consistent clamor by environmentalists for the need to mitigate the effects of climate change has necessitated the adoption of renewable energy sources (RES) for use by many developed/developing nations. The approach is geared towards gradually replacing or reducing the use of fossil fuels for electric power production. Solar power is among the major renewable energy sources in use today. But the use of solar energy is, unfortunately, characterized by fluctuations in its power generation due to the unpredictability of solar irradiance. Despite many methods in use already, accurate forecasting of solar irradiance has continued to be a great need both in the field of physical simulations and artificial intelligence. In this paper, an extreme gradient boosting (XGBoost) regression algorithm was deployed to successfully predict solar power with minimal error. Eighty percent of one-year and five years of historical hourly solar irradiance data of Johannesburg city were separately used as the training dataset. The results obtained using this algorithm were compared with the ones from Support Vector Machine (SVM), to determine the model with the least forecast errors. The results showed that the XGBoost model with an nRMSE value of 6.63% performed better than the SVM model with 6.81%. It is hoped that the implementation of the XGB algorithm for solar irradiance forecasts could greatly improve the stability of solar electric power generated for optimum connection to the power grid.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"6 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":"121801509","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: 8

Evaluating the Harmonic Effects on the Thermal Performance of Distributed Photovoltaic Power Generation Systems 谐波对分布式光伏发电系统热性能的影响

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543144

B. A. Thango, U. B. Akuru, J. Jordaan, L. S. Sikhosana, A. F. Nnnachi

{"title":"Evaluating the Harmonic Effects on the Thermal Performance of Distributed Photovoltaic Power Generation Systems","authors":"B. A. Thango, U. B. Akuru, J. Jordaan, L. S. Sikhosana, A. F. Nnnachi","doi":"10.1109/PowerAfrica52236.2021.9543144","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543144","url":null,"abstract":"The rapidly increasing demand for Distributed Photovoltaic Power (DPVP) generation system transformers and the rise in the construction of solar photovoltaic plants in South Africa, present technical challenges in the latter involving high top-liquid and hotspot temperatures problems during their service lifetime. The winding Eddy current loss harmonic factors recommended by the standards do not take into account the skin effect due to the restricted penetration of electromagnetic fields on the conductors at high harmonic orders, which results in erroneous estimation of these losses as well as high temperature rise. In order to enable optimum estimation of the winding Eddy current losses, it is proposed in this paper a harmonic loss factor that considers the conductor skin effect under harmonic conditions by using the data supplied by the manufacturer for losses under rated conditions. Based on supplied harmonic spectrum, the service losses of a liquid-filled step-up transformer are estimated, top-liquid and hotspot temperature conditions are then realized. Lastly, the capacity of a transformer when supplying the given distorted load current profile is evaluated by using a technique ascribed to as derating. The use of this method is achieved by the computation of the maximum permissible current as a result of increased winding Eddy current loss and other structural losses. The results indicate transformer loading capacity increase to 97.6 % compared to 91.3 % when applying the harmonic factor approach recommended by the standards.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"56 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":"122076259","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

Analysis of Microgrid Operation for Distribution System Support with Different Power Purchase Agreement Terms 不同购电协议条件下配电网支持微电网运行分析

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543321

O. Adeyanju, L. Canha

{"title":"Analysis of Microgrid Operation for Distribution System Support with Different Power Purchase Agreement Terms","authors":"O. Adeyanju, L. Canha","doi":"10.1109/PowerAfrica52236.2021.9543321","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543321","url":null,"abstract":"Recently in the power system, different scales of micro-grid can connect to the distribution system to support the distribution system operation. However, depending on the power purchase agreement terms determined by the distribution system operator for the microgrid investors, cost of energy could become elevated, making the inclusion of distributed energy resources less attractive to some other stakeholders in terms of cost. This study presents the analysis of microgrid operation for distribution system support considering different power purchase agreement terms. A two-level approach is proposed. In the first level, the optimal capacity of the MGs is determined. The second level includes the yearly cooperation of the distribution system operator and microgrids. The decision-making of the distribution system operator and microgrids under the management of a responsible aggregator and their consequences on the distribution system customer cost of energy is analyzed. Case studies are performed on a modified IEEE 33 -Bus System. Relevant results and suggestions are provided for an effective stakeholders' participation.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"250 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":"122106077","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

Characterization of Oscillations in Developing Power Systems: The Nigerian Case Study 发展中的电力系统振荡特征:尼日利亚案例研究

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543195

N. S. Ugwuanyi, U. Uma, A. Ekwue

引用次数: 1

Impact of Sunlight and Stand-Off Distance on Detection of Pollution Deposit on Silicone Rubber Insulators Adopting Remote LIBS

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543292

P. Vinod, M. S. Babu, R. Sarathi, N. Vasa, S. Kornhuber

{"title":"Impact of Sunlight and Stand-Off Distance on Detection of Pollution Deposit on Silicone Rubber Insulators Adopting Remote LIBS","authors":"P. Vinod, M. S. Babu, R. Sarathi, N. Vasa, S. Kornhuber","doi":"10.1109/PowerAfrica52236.2021.9543292","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543292","url":null,"abstract":"Silicone rubber insulators have been coated with different concentrations of NaCl in order to analyze their pollution performance using LIBS study. Elemental analysis of LIBS spectral peaks has been successful in identifying the sodium peaks, there by indicating the presence of salt deposits. Regression coefficient (R2) has been used as a performance parameter in correlating the ESDD and normalized intensity ratio. A direct correlation between ESDD and the normalized intensity ratio of LIBS spectral data is noticed with a regression coefficient value greater than 0.975 and RMSE value less than 0.07 for all standoff distances in the present study. The percentage reduction in the normalized intensity ratio of the peaks corresponding to Na I in case of morning and mid-day are less than 10% and 20% respectively, compared to night at different ESDD values and different energies of laser pulse. Overall, the LIBS technique is successful in identifying the variations in the salt deposit density on the insulator surface even at far distances of 15 m and at any time of the day.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"29 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":"125157836","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

Optimizing Performance and Stabilizing Efficiency of a Photovoltaic Array 光伏阵列性能优化与效率稳定

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543127

Y. K. Ramgolam, R. A. Ah King, V. Oree, T. Ramjeawon

{"title":"Optimizing Performance and Stabilizing Efficiency of a Photovoltaic Array","authors":"Y. K. Ramgolam, R. A. Ah King, V. Oree, T. Ramjeawon","doi":"10.1109/PowerAfrica52236.2021.9543127","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543127","url":null,"abstract":"In this research work, the impact of water flow on the performance and energy output efficiency of a photovoltaic system was investigated and quantified using a method based on photovoltaic performance indicator analysis. Water flow on the surface of solar modules decreases cell temperature and soiling effects. These effects were studied on a grid-tied 2.45 kW PV system located on the roof of the Engineering Tower at the University of Mauritius. A pyranometer was connected to a data logger to monitor changes in solar power at 30 s intervals. A piping system was implemented to provide water flow on the surface of the PV modules. An infra-red thermal imager was used to study the effect of water flow on module temperature. The performance of the system under tropical climatic conditions was measured and modeled in National Renewable Energy Laboratory System Advisor Model. A financial analysis was performed to determine the viability of the water flow system. Results show that water flow enhances and stabilizes energy output efficiency. It was observed that a decrease of 30% in soiling level resulted in an increase of approximately 30% in the energy output. A financial analysis showed that implementing a water flow system on a large scale power plant will make the system cost effective and ensure optimum output efficiency.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"1521 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":"127445475","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

A Review on Optimal Placement of Distributed Generators for Reliability Improvement on Distribution Network 提高配电网可靠性的分布式发电机优化配置研究进展

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543266

M. Aderibigbe, A. Adoghe, F. Agbetuyi, A. Airoboman

{"title":"A Review on Optimal Placement of Distributed Generators for Reliability Improvement on Distribution Network","authors":"M. Aderibigbe, A. Adoghe, F. Agbetuyi, A. Airoboman","doi":"10.1109/PowerAfrica52236.2021.9543266","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543266","url":null,"abstract":"The astronomically high demand for electrical power globally nowadays and the inability of the already strengthened existing infrastructure coupled with the high cost of investing in new expansion program by the utilities, necessitated the need for distributed generations to be injected into the distribution networks in order to meet consumer electricity demands. However, connecting DGs for optimal result to the distribution networks is an oculus task and created a lot of technical, economic, environmental and regulation difficulties with more enfaces centered around power system reliability. In this paper, a review on optimal placement of distributed generators for reliability improvement on distribution networks is presented. Majority of the work study centred on using both analytical and Monte Carlo simulation methodologies in finding the impact or effect of penetrating WTG and PV on reliability of distribution system while some researchers referred to distributed generation (DG) without been specific on DG types used. However, very view studies were conducted on ETAP/NEPLAN methodologies for sizing and allocating PV/ESS/Diesel Generator on the distribution systems for optimal reliability result. Also, the impact of energy storage system degradation, economic studies, reliability cost, cost benefit analysis and worth analysis of PV/ESS/Diesel Generator as DGs was least mentioned by most researchers in the course of their investigation. Moreover, distributed generation integration into the real distribution system for optimal reliability result using Supervisory Control and Data Acquisition (SCADA) System was least talked about by most researchers.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"55 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":"130000972","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

Design and Testing of a Demand Response Q-Learning Algorithm for a Smart Home Energy Management System 智能家居能源管理系统需求响应q -学习算法的设计与测试

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543244

Walter Angano, P. Musau, C. Wekesa

引用次数: 0

DSTATCOM Application for Distribution Network Power Quality Enhancement: A Review DSTATCOM在提高配电网电能质量中的应用综述

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543214

Mohamed Amidu Kallon, G. Nyakoe, C. Muriithi

{"title":"DSTATCOM Application for Distribution Network Power Quality Enhancement: A Review","authors":"Mohamed Amidu Kallon, G. Nyakoe, C. Muriithi","doi":"10.1109/PowerAfrica52236.2021.9543214","DOIUrl":"https://doi.org/10.1109/PowerAfrica52236.2021.9543214","url":null,"abstract":"The performance of electrical systems is becoming more affected by the increased voltage drop, power loss, and power quality problems. These issues can be drastically minimized by the incorporation of compensators in the distribution network. Distribution Static Compensator (DSTATCOM), like similar reactive power compensation systems, is a shunt connected unit of the Distribution Flexible AC Transmission System (DFACTS). DSTATCOM has been used for power system operation versatility and control in recent years, specifically to provide control for reactive power flow, power loss mitigation, power quality enhancement, and current and voltage control. Many researchers are presently carrying out studies on the optimal use of DSTATCOM in distribution networks. This paper presents a detailed summary of the recent approaches used by various authors to evaluate and determine the optimal use of DSTATCOM in distribution networks in order to enhance power quality. The methods and platforms used and the various research objectives are clearly outlined and discussed in detail. An analysis of the reviewed works is provided as well as suggestions for future research.","PeriodicalId":370999,"journal":{"name":"2021 IEEE PES/IAS PowerAfrica","volume":"1 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":"129786132","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

Smart MCB with Metering Ability to Optimize Electricity Usage 智能MCB计量能力，优化电力使用

2021 IEEE PES/IAS PowerAfrica Pub Date : 2021-08-23 DOI: 10.1109/PowerAfrica52236.2021.9543109

K. Manamperi, Hansi Shashika, Sachinda Ekanayake, Chamara Dassanayake, V. Sooriarachchi, Nicoloy Gurusinghe

引用次数: 0