2020 International SAUPEC/RobMech/PRASA Conference最新文献

Adaptive Model-Based Receding Horizon Control of Interconnected Renewable-Based Power Micro-grids for Effective Control and Optimal Power Exchanges 基于自适应模型的互联可再生电力微电网后退水平控制，实现有效控制和最优电力交换

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041136

PETER ANUOLUWAPO GBADEGA, A. K. Saha

{"title":"Adaptive Model-Based Receding Horizon Control of Interconnected Renewable-Based Power Micro-grids for Effective Control and Optimal Power Exchanges","authors":"PETER ANUOLUWAPO GBADEGA, A. K. Saha","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041136","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041136","url":null,"abstract":"This paper proposes an Adaptive Model-based Receding Horizon Control Scheme (AMRHCS), which allows taking into consideration the uncertainty power production of renewable energy resources, demand response, the variance of real-time electricity price, load demand and as well as respecting the special constraints for optimal performance and economic benefits of the micro-grids. The essence of this study is to propose a control scheme for the interconnected power microgrids so as to minimize the operating costs of the individual micro-grid, the power purchased by each micro-grid, the pollutant gas emissions, energy procured from the host grid and from the other micro-grids. Therefore, in order for these objectives to be achieved, an adaptive MPC controller is utilized to locate the best patterns for power exchange and state of energy storage system among micro-grids. More so, to investigate the optimal control action of the interconnected power micro-grids under the proposed control framework, we iteratively formulated a finite horizon Mixed Integer Linear Programming (MILP) problem. The MATLAB simulation results demonstrated the superiority of the proposed control technique in terms of excellent performance and economic benefits of the micro-grids.","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":"121078907","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: 13

Evaluation of Dielectric Elastomers in Applications as Low Cost, Small-Scale Actuators 介电弹性体在低成本、小型执行器中的应用评估

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9040950

I. Botha, G. Bright, J. Collins

引用次数: 2

Preliminary Tests on the Suitability of the Beta PDF to Model the Residential Load for New Planning Applications 试用PDF是否适合为新规划应用建立住宅负荷模型的初步测试

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041110

M. J. Chihota, B. Bekker

{"title":"Preliminary Tests on the Suitability of the Beta PDF to Model the Residential Load for New Planning Applications","authors":"M. J. Chihota, B. Bekker","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041110","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041110","url":null,"abstract":"The proliferation of distributed energy resources (DERs) such as electric vehicles, photovoltaic systems and battery energy storage systems has increased significantly over the past decade. While the integration of these technologies has several benefits to the grid, a wide spectrum of technical challenges has been reported. The technical challenges are partly due to the fact that the load conditions and operation of the power system with penetration of DERs differ significantly from the conditions accommodated at the time of planning of the network. To host the DERs without violation of quality of supply standards, engineers are facing a new challenge of defining regulations for uptake. Moreover, new planning standards are required for future electrification projects where DER penetration is anticipated. To achieve this, new load models are necessary since the penetration of DERs introduces new periods of strain to the network apart from the interval of maximum demand as previously valid. In South Africa, a probabilistic load flow approach based on the Beta probability density function (PDF) as a descriptor of load currents is the standard for the design of low voltage networks. Since the standard is only applicable to passive feeders without DERs, the associated load models are defined only for the interval of maximum demand. This paper tests the suitability of the Beta PDF to model other intervals relevant for network analysis under DER penetration. Preliminary tests focused on PV applications are presented as a case study. Results demonstrate that the Beta PDF remains a suitable model for the summer after-diversity-demand for grouped customers in South Africa.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"229 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":"116443164","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

Effects of Current Harmonics on Maximum Loading Capability for Solar Power Plant Transformers 电流谐波对太阳能发电厂变压器最大负载能力的影响

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041101

B. A. Thango, J. Jordaan, A. Nnachi

引用次数: 10

Hand vein-based biometric authentication using two-channel similarity measure networks 基于手静脉的双通道相似性测量网络生物特征认证

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041064

Emile Beukes, Johannes Coetzer

{"title":"Hand vein-based biometric authentication using two-channel similarity measure networks","authors":"Emile Beukes, Johannes Coetzer","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041064","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041064","url":null,"abstract":"In this paper the feasibility of convolutional neural networks (CNNs) for the purpose of authenticating an individual based on near infra-red (NIR) images of his/her dorsal hand vein patterns is investigated. In particular, a subset of CNNs called two-channel similarity measure networks (2CH-SMNs) is considered, since the problem at hand involves authentication (verification), instead of recognition (classification). All hand vein images are cropped and binarised before presented to the 2CH-SMN, in order to ensure that the focus of the network is on the structure of the hand veins, and not on the shape of the hand or on the grey-scale background variations surrounding the hand vein structure. A tailor-made 2CH-SMN is trained for each client enrolled into the system by considering authentic hand vein images from the client in question, as well as fraudulent images from other enrolled clients. Different images from the client in question and images from other non-training clients are employed for validation purposes, as well as for selecting optimal client-specific probability thresholds. Another distinct subset of authentic images, as well as images from imposters (non-clients) are used for testing. The results are encouraging.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"127 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":"117254851","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

Confident in the Crowd: Bayesian Inference to Improve Data Labelling in Crowdsourcing 在人群中自信:贝叶斯推理改进众包中的数据标签

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041099

Pierce Burke, Richard Klein

{"title":"Confident in the Crowd: Bayesian Inference to Improve Data Labelling in Crowdsourcing","authors":"Pierce Burke, Richard Klein","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041099","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041099","url":null,"abstract":"With the increased interest in machine learning and big data problems, the need for large amounts of labelled data has also grown. However, it is often infeasible to get experts to label all of this data, which leads many practitioners to crowdsourcing solutions. In this paper, we present new techniques to improve the quality of the labels while attempting to reduce the cost. The naive approach to assigning labels is to adopt a majority vote method, however, in the context of data labelling, this is not always ideal as data labellers are not equally reliable. One might, instead, give higher priority to certain labellers through some kind of weighted vote based on past performance. This paper investigates the use of more sophisticated methods, such as Bayesian inference, to measure the performance of the labellers as well as the confidence of each label. The methods we propose follow an iterative improvement algorithm which attempts to use the least amount of workers necessary to achieve the desired confidence in the inferred label. This paper explores simulated binary classification problems with simulated workers and questions to test the proposed methods. Our methods outperform the standard voting methods in both cost and accuracy while maintaining higher reliability when there is disagreement within the crowd.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"51 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":"129006766","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

Learning Options from Demonstration using Skill Segmentation 使用技能分割从演示中学习选项

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9040988

M. Cockcroft, Shahil Mawjee, Steven D. James, Pravesh Ranchod

引用次数: 3

Thin film photovoltaic module characterisation based in indoor and outdoor methods 基于室内和室外方法的薄膜光伏组件表征

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041024

S. May, Lawrence Pratt, P. Bokoro

{"title":"Thin film photovoltaic module characterisation based in indoor and outdoor methods","authors":"S. May, Lawrence Pratt, P. Bokoro","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041024","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041024","url":null,"abstract":"Photovoltaic modules are normally tested under standard test conditions defined by the International Electrotechnical Commission, but these conditions are different from typical field condition. The standard test conditions for PV modules is specified as 1000 W/m2 irradiance and 25°C cell temperature and reference spectral American Society for Testing and Materials (ASTM) G173. The light source may be natural or simulated, but it must match the reference standard as described in IEC 60904–3. The effect of spectral variations on the 1-V measurements can may have a big impact on the accuracy of the performance measurements. This effect was quantified during in this the study at the Indoor and Outdoor PV testing facility in Council for Scientific and Industrial research, Energy Initiative Pretoria campus. Results show different spectral mismatch values were obtained when two different spectral reference cells were used on the indoor measurements of modules under test. The obtained spectral mismatch values were affected by the absence of true spectral data of modules under test. The irradiance corrected Isc outdoor measurement values were higher than measured uncorrected Isc measurements due to the first order impact from the measured irradiance in the plane of array. The spectral mismatch between the reference device and the PV module results in an additional error for thin film modules.","PeriodicalId":215514,"journal":{"name":"2020 International SAUPEC/RobMech/PRASA Conference","volume":"40 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":"129250677","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

Assessment of the Cup-to-Disc ratio method for Glaucoma detection 青光眼杯盘比检测方法的评价

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041005

A. O. Joshua, G. Mabuza-Hocquet, F. Nelwamondo

引用次数: 5

A Self-Driving Car Architecture in ROS2 ROS2中的自动驾驶汽车架构

2020 International SAUPEC/RobMech/PRASA Conference Pub Date : 2020-01-01 DOI: 10.1109/SAUPEC/RobMech/PRASA48453.2020.9041020

Michael Reke, Daniel Peter, Joschua Schulte-Tigges, S. Schiffer, A. Ferrein, Thomas Walter, Dominik Matheis

{"title":"A Self-Driving Car Architecture in ROS2","authors":"Michael Reke, Daniel Peter, Joschua Schulte-Tigges, S. Schiffer, A. Ferrein, Thomas Walter, Dominik Matheis","doi":"10.1109/SAUPEC/RobMech/PRASA48453.2020.9041020","DOIUrl":"https://doi.org/10.1109/SAUPEC/RobMech/PRASA48453.2020.9041020","url":null,"abstract":"In this paper we report on an architecture for a self-driving car that is based on ROS2. Self-driving cars have to take decisions based on their sensory input in real-time, providing high reliability with a strong demand in functional safety. In principle, self-driving cars are robots. However, typical robot software, in general, and the previous version of the Robot Operating System (ROS), in particular, does not always meet these requirements. With the successor ROS2 the situation has changed and it might be considered as a solution for automated and autonomous driving. Existing robotic software based on ROS was not ready for safety critical applications like self-driving cars. We propose an architecture for using ROS2 for a self-driving car that enables safe and reliable real-time behaviour, but keeping the advantages of ROS such as a distributed architecture and standardised message types. First experiments with an automated real passenger car at lower and higher speed-levels show that our approach seems feasible for autonomous driving under the necessary real-time conditions.","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":"121851387","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: 34