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Development of Solar Irradiance Forecast Confidence Intervals for Solar Electric Vehicle Energy Simulations 太阳能电动汽车能量模拟中太阳辐照度预测置信区间的发展
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041019
Christiaan Oosthuizen, B. Van Wyk, Y. Hamam, Y. Alayli, D. Desai
{"title":"Development of Solar Irradiance Forecast Confidence Intervals for Solar Electric Vehicle Energy Simulations","authors":"Christiaan Oosthuizen, B. Van Wyk, Y. Hamam, Y. Alayli, D. Desai","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041019","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041019","url":null,"abstract":"Solar electric vehicle racing is becoming ever more popular, especially in countries such as America, Australia, and South Africa. Teams are continuously looking for better and more effective ways to manage their energy as well as interpreting the solar irradiance forecasts. This paper shows how historical forecasts with measured data are used to create expected upper and lower forecast bounds to enable solar racing teams to make more informed energy decisions.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129746194","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
User Classification by Keystroke Dynamics using Text Retrieval Methods 使用文本检索方法的击键动力学用户分类
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9040956
Thato Mokoena, D. Sabatta
{"title":"User Classification by Keystroke Dynamics using Text Retrieval Methods","authors":"Thato Mokoena, D. Sabatta","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9040956","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9040956","url":null,"abstract":"To verify the identity of users, the majority of computer systems employ conventional authentication schemes such as Personal Identification Number (PIN), password and token. Over the years, these schemes have become less robust as they can be guessed, cracked, stolen or shared. Biometric-based authentication methods have positioned themselves as better options as they do not suffer from the same limitations as conventional methods. The reason being that biometrics exploit the uniqueness of a subject with regards to what they are or how they behave. In this paper, we investigate the use of a behavioural biometric, Keystroke Dynamics (KSD) as a means of identity verification for online persons. We present the proof-of-concept of a novel keystroke dynamics authentication method that is based on text retrieval concepts and methods. We test our algorithm on a classification task and achieve promising results. Furthermore, we show experimentally that a person's typing behaviour is susceptible to the environment in which they are typing.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129829592","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
Load models for technical and tariff analysis of medium voltage feeders 中压馈线技术和电价分析用负荷模型
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041031
Lolo Buys, C. T. Gaunt
{"title":"Load models for technical and tariff analysis of medium voltage feeders","authors":"Lolo Buys, C. T. Gaunt","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041031","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041031","url":null,"abstract":"Distribution feeders have changed with the introduction of distributed generation, and probabilistic approaches to analysis are recognized as more representative of performance than deterministic ones. Probability analysis requires probabilistic models of a wide range of loads and generation profiles. Eskom has a large data base of measurements at customers on medium voltage feeders. Some of the data have been extracted and used in this pilot project to cluster load profiles. It is possible to identify representative customer groups and representative days. The models are suitable for network performance and tariffs analysis.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114308443","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
DC Power Quality Emulator 直流电源质量仿真器
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041079
Riekert Jansen van Vuuren, Gerhard Botha
{"title":"DC Power Quality Emulator","authors":"Riekert Jansen van Vuuren, Gerhard Botha","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041079","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041079","url":null,"abstract":"Currently, no dc power quality standards exist. The lack of dc power quality (PQ) standards can be addressed by, amongst others, evaluating the impact of PQ deviations on consumer end equipment. A voltage disturbance emulation test source (VDETS) was designed that can be used to test the operation of dc equipment when subjected to different power quality disturbances. This paper provides a discussion on the design of the VDETS and the methods of emulating dc voltage dips (sags), voltage swells, ripple voltage, undervoltage, overvoltage and voltage interruptions. Basic testing of the VDETS is reported by means of voltage dip testing on two different dc light sources.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114581520","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
Modelling of Wind Turbine Power Curves (WTPCs) Based on the Sum of the Sine Functions and Improved version of Particle Swarm Optimization (IPSO) 基于正弦函数和改进粒子群算法的风力机功率曲线建模
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041008
A. Goudarzi, Farzad Ghayoor
{"title":"Modelling of Wind Turbine Power Curves (WTPCs) Based on the Sum of the Sine Functions and Improved version of Particle Swarm Optimization (IPSO)","authors":"A. Goudarzi, Farzad Ghayoor","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041008","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041008","url":null,"abstract":"Wind turbine power curves (WTPCs) represent the relationship between wind speed variations at the hub height and the output power of wind turbines. The WTPCs' models can be used by utility system operators and independent power producers (IPPs) for wind energy monitoring, assessment, planning, and forecast. As a result of considerable growth in the wind energy industry, wind turbines are installed in different geographical locations and climatic conditions such as on-shore, o □ -shore and complex terrains. This leads to a significant deviation of WTPCs from the manufacturer models, which are obtained based on an ideal situation. Therefore, accurate modeling of WTPCs can play a crucial role in improving the performance of wind energy-based systems. This study presents a detailed analysis for modeling of WTPCs based on four Enercon wind turbines; E-53 (800 kW), E-70 (2300 kW), E-82-E3 (3000 kW) and E-126 (7500 kW). Firstly, the proposed method of the study, which is based on the sum of the sine functions, is compared to a number of previously developed mathematical models by means of the goodness of fit analysis. In the second step, the accuracy of the proposed models has been enhanced by the utilization of an improved version of particle swarm optimization (IPSO) through the optimization of the model's coefficients. To verify the practicality of IPSO adaptation by the proposed models, the obtained results of the second step have been compared with several optimization methods.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"16 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134004503","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: 5
SCADA and Substation Automation Systems for the Port of Durban Power Supply Upgrade 德班港供电升级SCADA和变电站自动化系统
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041078
Siphokazi Mnukwa, A. Saha
{"title":"SCADA and Substation Automation Systems for the Port of Durban Power Supply Upgrade","authors":"Siphokazi Mnukwa, A. Saha","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041078","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041078","url":null,"abstract":"The Port of Durban (PoD) is currently upgrading its existing power supply to a supply voltage of 132 kV. The design of this electrical substation system will take into consideration the modernization of the substation system that will improve flexibility and improved efficiency. Modern power systems substation are equipped with Intelligent Electronic Devices (IEDs). The IEDs are designed to comply with IEC 61850 standard communications protocols with interoperability features for substation protection, control and coordination. Substation Automation Systems (SAS) provides facilities for monitoring and controlling all the equipment in the substation locally and remotely. The Supervisory Control And Data Acquisition (SCADA) system will be developed to provide users/operators with Human Machine Interface (HMI) or graphical representation of the electrical substation that will be used for controlling, monitoring and protection of devices in real time and this will help maximize availability, efficiency, reliability, safety and data integration.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130608797","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: 12
Line Reactance Criteria for Minimizing Line Current Harmonic Content in Diode Rectifier Connected Wind Generator Systems 二极管整流器连接风力发电机系统中最小线路电流谐波含量的线路电抗准则
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041047
M. Kamper, Christopher Africa, C. Labuschagne, L. P. Mdakane
{"title":"Line Reactance Criteria for Minimizing Line Current Harmonic Content in Diode Rectifier Connected Wind Generator Systems","authors":"M. Kamper, Christopher Africa, C. Labuschagne, L. P. Mdakane","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041047","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041047","url":null,"abstract":"An analysis method to ensure sinusoidal currents in wind generators that are directly connected to diode rectifiers in DC wind energy systems is considered in this paper. A simple analytic calculation method is introduced whereby the harmonic generator line currents can be calculated. This method is used to identify the necessary per unit line reactance values to ensure a low harmonic current content. It is found that 0.8 per unit reactance reduces the 5th harmonic line current to 5 % of the fundamental. It is further found that multiphase generator systems show no advantage in this regard.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116659318","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
Estimating financial viability of behind-the-meter peak shaving based on load profile shape: a shopping mall case study 估计基于负荷轮廓形状的电表后调峰的财务可行性:一个购物中心的案例研究
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041083
Johannes Mostert, B. Bekker
{"title":"Estimating financial viability of behind-the-meter peak shaving based on load profile shape: a shopping mall case study","authors":"Johannes Mostert, B. Bekker","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041083","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041083","url":null,"abstract":"This paper explores if trends exist in daily load profile shapes that can give an indication of the viability of implementing a behind-the-meter battery energy storage system for peak shaving applications. To explore this topic, five shopping mall profiles were analyzed, with and without a photovoltaic array. The critical load profile day was used as a focus point for analysis. An interactive visualization tool was developed to assist the user in identifying the critical load profile in every month. These load profile shapes were then analyzed in an attempt to link their shape attributes to financial metrics obtained from HOMER Grid simulation software. The critical load profiles were successfully categorized into different shape categories with every shape linking to a better or worse return in relation to another.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125837974","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
Investigation of Corona Partial Discharge at Variable Applied Frequency 变频率电晕局部放电的研究
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041036
T. Khumalo, Zakhele Skosana, C. Nyamupangedengu
{"title":"Investigation of Corona Partial Discharge at Variable Applied Frequency","authors":"T. Khumalo, Zakhele Skosana, C. Nyamupangedengu","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041036","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041036","url":null,"abstract":"An investigation of corona partial discharge (PD) under different supply voltage frequencies is presented. The supply voltage frequency range was varied from 0 – 260 Hz. The aim was to observe and analyse the effects that the supply voltage frequency has on PD characteristics such as PD inception and PD magnitude. A high frequency current transformer (HFCT) was implemented as a non-conventional measurement method in accordance with the IEC Standard 62478. The results showed that with an increase in frequency, the voltage inception of PD decreased. On the other hand, the magnitude of PD increased as the frequency increased. These trends are interpreted in terms of effective discharge time and residual space charge.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123673872","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
Influence of Supply Voltage Frequency on Cavity Partial Discharge Parameters: Simulation Results 电源频率对腔体局部放电参数的影响:仿真结果
2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9040962
Tapiwa Venge, C. Nyamupangedengu
{"title":"Influence of Supply Voltage Frequency on Cavity Partial Discharge Parameters: Simulation Results","authors":"Tapiwa Venge, C. Nyamupangedengu","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9040962","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9040962","url":null,"abstract":"This paper presents simulation results on the influence of supply voltage frequency on cavity partial discharges (PD) parameters. The capacitance equivalent model is implemented in MATLAB® Simulink® to achieve the results. Frequency dependent mechanisms responsible for this influence are the statistical time lag, surface and bulk conductivity, and surface charge decay and electron de-trapping. Only the first two of these mechanisms are implemented in the model to get their effect on partial discharge inception voltage (PDIV) as well as the phase-resolved partial discharge patterns. PDIV and PD magnitude increase as the supply voltage frequency is increased. Pulse repetition rate (PRR) has two trends whereby for frequencies between very low frequency to 50 Hz it increases whereas for frequencies above 50 Hz it decreases. More analysis is required to understand why these two trends behave the way they do. Modeling of the surface charge decay and electron de-trapping factor, and experimental results is recommended to validate and give more confidence and reliability to the simulation results.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127897745","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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