2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)最新文献
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704821
A. Ojo, K. Awodele, A. Sebitosi
Unbalanced loads are quite common in a three-phase network and this is one of the major causes of voltage unbalance in low voltage distribution networks. The traditional three-phase compensators are mainly used for reactive power elimination without the neutral current elimination while the susceptances calculation are also based on the load admittance which is difficult to measure. A hybrid compensator containing star and delta segments can be used for neutral current elimination, load balancing and power factor improvement. In this paper, a mathematical model is derived based on the phase and sequence components of the load current using symmetrical components theory for load balancing, power factor correction and neutral current elimination. The validation of the proposed model is done through MATLAB simulation.
{"title":"Load Compensation in a Three-Phase Four Wire Distribution System Considering Unbalance, Neutral Current Elimination and Power Factor Improvement","authors":"A. Ojo, K. Awodele, A. Sebitosi","doi":"10.1109/ROBOMECH.2019.8704821","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704821","url":null,"abstract":"Unbalanced loads are quite common in a three-phase network and this is one of the major causes of voltage unbalance in low voltage distribution networks. The traditional three-phase compensators are mainly used for reactive power elimination without the neutral current elimination while the susceptances calculation are also based on the load admittance which is difficult to measure. A hybrid compensator containing star and delta segments can be used for neutral current elimination, load balancing and power factor improvement. In this paper, a mathematical model is derived based on the phase and sequence components of the load current using symmetrical components theory for load balancing, power factor correction and neutral current elimination. The validation of the proposed model is done through MATLAB simulation.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"26 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115351161","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704742
Tumiso Ledwaba, Karabo Senyane, J. Van Coller
The results and findings of testing an ABB RED670 current differential relay protecting a 400 kV transmission line that spans a length of 400 km is presented. The relay is configured such that it clears all internal faults and does not issue trip signals for external faults for a single circuit line without series capacitor compensation. The effects of each of the following on the response of the relay are then investigated: the addition of another circuit on the same tower, the insertion of mid-line series capacitors on the single circuit to compensate for 30% of the line inductive reactance and the simultaneous addition of another circuit on the same tower and series capacitors on the now double circuit line. The relay was able to trip for all internal faults and the average time to clear faults was 30 ms (1.5 cycles). The relay was also able to not issue trip signals for all faults initiated on the adjacent circuit
{"title":"Hardware-In-Loop Testing of a Differential Relay Used to Protect Single/Double Circuit Transmission Lines","authors":"Tumiso Ledwaba, Karabo Senyane, J. Van Coller","doi":"10.1109/ROBOMECH.2019.8704742","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704742","url":null,"abstract":"The results and findings of testing an ABB RED670 current differential relay protecting a 400 kV transmission line that spans a length of 400 km is presented. The relay is configured such that it clears all internal faults and does not issue trip signals for external faults for a single circuit line without series capacitor compensation. The effects of each of the following on the response of the relay are then investigated: the addition of another circuit on the same tower, the insertion of mid-line series capacitors on the single circuit to compensate for 30% of the line inductive reactance and the simultaneous addition of another circuit on the same tower and series capacitors on the now double circuit line. The relay was able to trip for all internal faults and the average time to clear faults was 30 ms (1.5 cycles). The relay was also able to not issue trip signals for all faults initiated on the adjacent circuit","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"512 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123201007","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704817
J. Louw, A. Rix
Bi-facial PV modelling software is scarce and existing software mainly implements the view factor model which may neglect a number of effects that greatly influence the rear side irradiance of bi-facial modules. This paper shows the results of bi-facial PV simulation software that is being developed by implementing the ray tracing technique to model the factors that lead to increased energy yields of bi-facial PV technology. A bi-facial PV plant is modelled by interfacing Radiance (ray tracing software) with python based simulation software. Simulation results are compared with real world irradiance measurements to determine the accuracy of the developed software model. The preliminary results of the simulation software are promising and show that ray tracing techniques can satisfy the shortcomings of existing bi-facial PV simulation software with more accurate modelling of the rear side irradiance of modules.
{"title":"Irradiance modelling for bi-facial PV modules using the ray tracing technique","authors":"J. Louw, A. Rix","doi":"10.1109/ROBOMECH.2019.8704817","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704817","url":null,"abstract":"Bi-facial PV modelling software is scarce and existing software mainly implements the view factor model which may neglect a number of effects that greatly influence the rear side irradiance of bi-facial modules. This paper shows the results of bi-facial PV simulation software that is being developed by implementing the ray tracing technique to model the factors that lead to increased energy yields of bi-facial PV technology. A bi-facial PV plant is modelled by interfacing Radiance (ray tracing software) with python based simulation software. Simulation results are compared with real world irradiance measurements to determine the accuracy of the developed software model. The preliminary results of the simulation software are promising and show that ray tracing techniques can satisfy the shortcomings of existing bi-facial PV simulation software with more accurate modelling of the rear side irradiance of modules.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"339 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122543261","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704759
F. Mthethwa, J. Van Coller
Medium Voltage (MV) Overhead Lines (OHL) are normally designed in a radial nature which results in back-feeding challenges. MV feeders are usually long in length and that exposes them a huge deal to faults. Major attention has to be paid to these networks since they create faults which affect customers. It is therefore essential to develop self-healing Smart Grid technologies to improve the performance of these networks and to ensure minimum customer interruption during an outage. One such technology is Fault Location, Isolation and Service Restoration (FLISR). The key motivation of implementing FLISR is to advance the utility’s network reliability. This paper addresses ways to implement FLISR and it focuses on a real distribution network case study and it looks at the issues associated with closing a remotely controlled or automatically operated Normally Open (N/O) point for back-feeding purposes. The benefits of implementing an automated service restoration to Eskom are to minimize the number of customers affected by a fault by automatically isolating the faulted location and restoring service to the healthy portion of customers. This will ultimately minimize the number of customer-hours interrupted (SAIDI) to the values required by the National Energy Regulator of South Africa (NERSA).
{"title":"Supply Auto-Restoration using Automated Normally Open (N/O) point on Medium Voltage (MV) Networks for the Fault Location, Isolation and Service Restoration (FLISR) Technology","authors":"F. Mthethwa, J. Van Coller","doi":"10.1109/ROBOMECH.2019.8704759","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704759","url":null,"abstract":"Medium Voltage (MV) Overhead Lines (OHL) are normally designed in a radial nature which results in back-feeding challenges. MV feeders are usually long in length and that exposes them a huge deal to faults. Major attention has to be paid to these networks since they create faults which affect customers. It is therefore essential to develop self-healing Smart Grid technologies to improve the performance of these networks and to ensure minimum customer interruption during an outage. One such technology is Fault Location, Isolation and Service Restoration (FLISR). The key motivation of implementing FLISR is to advance the utility’s network reliability. This paper addresses ways to implement FLISR and it focuses on a real distribution network case study and it looks at the issues associated with closing a remotely controlled or automatically operated Normally Open (N/O) point for back-feeding purposes. The benefits of implementing an automated service restoration to Eskom are to minimize the number of customers affected by a fault by automatically isolating the faulted location and restoring service to the healthy portion of customers. This will ultimately minimize the number of customer-hours interrupted (SAIDI) to the values required by the National Energy Regulator of South Africa (NERSA).","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127523148","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704775
Pitambar Jankee, K. Awodele
This paper discusses the design and testing of an IEC61850 based Substation Protection Panel using SEL protective relays. The modelled substation includes multiple zones of protection. Faults are applied to the system using push-buttons to analyse the operation and extended features of Intelligent Electronic Devices (IEDs). These relays operate the contactors which open to disconnect the faulty part of the Substation model. Light indicators are used to show the open or closed positions of the contactors. The Protection Panel operates as required under internal and external fault conditions. The Panel is capable of peer to peer communication between protective relays (IEDs) using GOOSE messages. The panel can be used to demonstrate some applications of the IEC61850 in Substation Automation and Protection to Electrical Engineering Students at the University of Cape Town.
{"title":"Design Of An Iec61850 Based Substation Automation and Protection Panel : Including peer to peer relay communication","authors":"Pitambar Jankee, K. Awodele","doi":"10.1109/ROBOMECH.2019.8704775","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704775","url":null,"abstract":"This paper discusses the design and testing of an IEC61850 based Substation Protection Panel using SEL protective relays. The modelled substation includes multiple zones of protection. Faults are applied to the system using push-buttons to analyse the operation and extended features of Intelligent Electronic Devices (IEDs). These relays operate the contactors which open to disconnect the faulty part of the Substation model. Light indicators are used to show the open or closed positions of the contactors. The Protection Panel operates as required under internal and external fault conditions. The Panel is capable of peer to peer communication between protective relays (IEDs) using GOOSE messages. The panel can be used to demonstrate some applications of the IEC61850 in Substation Automation and Protection to Electrical Engineering Students at the University of Cape Town.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126857762","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704813
Ikaneng Victor Raphoolo, J. D. de Kock
The transient and dynamic stability are key elements that a system should satisfy to achieve stable system operation [1]. Fault type and location determine the impact that each fault puts on the system and whether power generators stay in synchronism. The Eskom-Mabote tie-line is key to satisfying Lesotho power system (LPS) peak load demand of 150 MW. Any faults on the tie-line that affect the power transfer capacity threaten the continuity of supply as they can result in system collapse. When clearing of faults is longer than the critical fault clearing time (CFCT), the generators lose synchronism and trip as a protective measure. The knock-on effect of system collapse contributes to Lesotho’s struggling techno-economic standing.The absence of a contingency to counteract the effects of the tie-line failure and so minimize the impact on the supply/demand mismatch, often results in frequency violations. Using DIgSILENT, this study investigates the impact of the tie-line failure during the peak load and proposes load curtailment measures by employing dynamic-load shedding to avoid complete system collapse. Secondly, the study outlines the solutions to overcome the existing supply/demand challenge during tie-line failure to minimize the recurrence of system collapse. Thirdly, the study investigates the causes of failure to resynchronize and the impact of live system load to satisfy the requisite resynchronizing requirements, viz. change in voltage, frequency, and load angle. The study also reflects on the impact of different amounts of live loads during restoration considering the hypothetical extreme cases.
{"title":"Dynamic load-shedding for enhancement of power system stability for the Lesotho 132 kV transmission network","authors":"Ikaneng Victor Raphoolo, J. D. de Kock","doi":"10.1109/ROBOMECH.2019.8704813","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704813","url":null,"abstract":"The transient and dynamic stability are key elements that a system should satisfy to achieve stable system operation [1]. Fault type and location determine the impact that each fault puts on the system and whether power generators stay in synchronism. The Eskom-Mabote tie-line is key to satisfying Lesotho power system (LPS) peak load demand of 150 MW. Any faults on the tie-line that affect the power transfer capacity threaten the continuity of supply as they can result in system collapse. When clearing of faults is longer than the critical fault clearing time (CFCT), the generators lose synchronism and trip as a protective measure. The knock-on effect of system collapse contributes to Lesotho’s struggling techno-economic standing.The absence of a contingency to counteract the effects of the tie-line failure and so minimize the impact on the supply/demand mismatch, often results in frequency violations. Using DIgSILENT, this study investigates the impact of the tie-line failure during the peak load and proposes load curtailment measures by employing dynamic-load shedding to avoid complete system collapse. Secondly, the study outlines the solutions to overcome the existing supply/demand challenge during tie-line failure to minimize the recurrence of system collapse. Thirdly, the study investigates the causes of failure to resynchronize and the impact of live system load to satisfy the requisite resynchronizing requirements, viz. change in voltage, frequency, and load angle. The study also reflects on the impact of different amounts of live loads during restoration considering the hypothetical extreme cases.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126704178","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}
Pub Date : 2019-01-01DOI: 10.1109/robomech.2019.8704753
{"title":"SAUPEC/RobMech/PRASA 2019 Copyright Page","authors":"","doi":"10.1109/robomech.2019.8704753","DOIUrl":"https://doi.org/10.1109/robomech.2019.8704753","url":null,"abstract":"","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134548317","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704736
I. Kyere, J. Walker, C. Nyamupangedengu
This study presents the simulation of the electrical field distribution in voids encapsulated in epoxy insulation material using QuickField™ software. The significance of this study is to further understand how electric field distribution influences partial discharge activity in insulation material containing air voids. The insulation model consists of single and double voids located in the middle of the insulation. The simulation results indicate that the electric field in the single void is higher than in the case of two voids adjacent to each other. However, despite the voids being identical to the enhancements of the electric fields in the voids is not to the same extent.
{"title":"Simulation of Electric Field Effects in High Voltage Insulation Material Containing Air Voids","authors":"I. Kyere, J. Walker, C. Nyamupangedengu","doi":"10.1109/ROBOMECH.2019.8704736","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704736","url":null,"abstract":"This study presents the simulation of the electrical field distribution in voids encapsulated in epoxy insulation material using QuickField™ software. The significance of this study is to further understand how electric field distribution influences partial discharge activity in insulation material containing air voids. The insulation model consists of single and double voids located in the middle of the insulation. The simulation results indicate that the electric field in the single void is higher than in the case of two voids adjacent to each other. However, despite the voids being identical to the enhancements of the electric fields in the voids is not to the same extent.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132802350","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704849
Dhruv Bhugwan, Pravesh Ranchod, Richard Klein, Benjamin Rosman
Semantic segmentation using fully convolutional networks has quickly become a popular solution as they provide very accurate per pixel classification. However, the implementation of deconvolutional layers and their mechanics differ greatly to those of patch based segmentation using convolutional neural networks. Both techniques have been used for road segmentation from satellite imagery but never compared. Thus we investigate the difference between fully connected and deconvolutional layers and provide an interpretation as to the correlation and differences between each methodology for road segmentation from satellite imagery.
{"title":"A comparison between fully connected and deconvolutional layers for road segmentation from satellite imagery","authors":"Dhruv Bhugwan, Pravesh Ranchod, Richard Klein, Benjamin Rosman","doi":"10.1109/ROBOMECH.2019.8704849","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704849","url":null,"abstract":"Semantic segmentation using fully convolutional networks has quickly become a popular solution as they provide very accurate per pixel classification. However, the implementation of deconvolutional layers and their mechanics differ greatly to those of patch based segmentation using convolutional neural networks. Both techniques have been used for road segmentation from satellite imagery but never compared. Thus we investigate the difference between fully connected and deconvolutional layers and provide an interpretation as to the correlation and differences between each methodology for road segmentation from satellite imagery.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130254246","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}
Pub Date : 2019-01-01DOI: 10.1109/ROBOMECH.2019.8704847
Tresor Oteko Lisungu, M. Sumbwanyambe
With an ever increase usage of multi-media content, such audio, image and video across networks, image compression and security of content has become almost a need to users who would want to transmit over such networks. Transmitting over such networks, especially with images, may result in some information in an image being lost. For that reason good and efficient encryption methods are needed to store and transmit images while preserving the best imaginable quality features enhanced with security. This paper suggests or develops an efficient image compression-encryption scheme based on Discrete wavelet decomposition, SPIHT and Qi hyperchaos. Pseudo-random numbers generated from Qi hyper chaos and which are in line with the Federal Information Processing Standards (FIPS) and National Institute of Standards and Technology (NIST) were used in this study. The random numbers were used to change the image characteristics and in essence to hide the visual information related to image. To achieve the selective Compression-encryption, the 2-D wavelet transform was used to decompose the image into details and approximation components, Set Partitioning in Hierarchical Tree compression method was used to compress the decomposed LL2 image before being encrypted with the bits stream key generated from the Qi hyper-chaos using exclusive or operation. The experimental results demonstrate that the proposed scheme is good for data compression and encryption.
{"title":"Image Compression-Encryption Scheme Based on 2D DWT, SPIHT and Qi Hyper-chaos","authors":"Tresor Oteko Lisungu, M. Sumbwanyambe","doi":"10.1109/ROBOMECH.2019.8704847","DOIUrl":"https://doi.org/10.1109/ROBOMECH.2019.8704847","url":null,"abstract":"With an ever increase usage of multi-media content, such audio, image and video across networks, image compression and security of content has become almost a need to users who would want to transmit over such networks. Transmitting over such networks, especially with images, may result in some information in an image being lost. For that reason good and efficient encryption methods are needed to store and transmit images while preserving the best imaginable quality features enhanced with security. This paper suggests or develops an efficient image compression-encryption scheme based on Discrete wavelet decomposition, SPIHT and Qi hyperchaos. Pseudo-random numbers generated from Qi hyper chaos and which are in line with the Federal Information Processing Standards (FIPS) and National Institute of Standards and Technology (NIST) were used in this study. The random numbers were used to change the image characteristics and in essence to hide the visual information related to image. To achieve the selective Compression-encryption, the 2-D wavelet transform was used to decompose the image into details and approximation components, Set Partitioning in Hierarchical Tree compression method was used to compress the decomposed LL2 image before being encrypted with the bits stream key generated from the Qi hyper-chaos using exclusive or operation. The experimental results demonstrate that the proposed scheme is good for data compression and encryption.","PeriodicalId":344332,"journal":{"name":"2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133835701","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}
2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)
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