Pub Date : 2006-09-01DOI: 10.1109/UPEC.2006.367543
K. Benmansour, A. Zahraee, M. Djemai
In this paper a new switching scheme for modelling multicellular converters is proposed. A converter with two cells which is represented as a hybrid system with four modes of operation. The simulation of the hybrid system is realized with Stateflow. Simulation results are given to shows the efficiency of the proposed method
{"title":"Hybrid Modelling of a Multicellular Converter","authors":"K. Benmansour, A. Zahraee, M. Djemai","doi":"10.1109/UPEC.2006.367543","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367543","url":null,"abstract":"In this paper a new switching scheme for modelling multicellular converters is proposed. A converter with two cells which is represented as a hybrid system with four modes of operation. The simulation of the hybrid system is realized with Stateflow. Simulation results are given to shows the efficiency of the proposed method","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122134432","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367620
J. Carvalho
Nowadays, energy and in particular, electrical energy is fundamental in all activities, especially, in economic activities and in their development. Actually, electrical energy is the motor of all evolution and development that we witness all over the world. In fact, electrical energy is everywhere, from the smallest home electrical installation to the most complex industrial installation or in any scientific research room. Actually, in the point of view of manufacturers and users, electrical energy must be considered a good thing with great importance and, for this, it must be supplied by the former with quality and used by the latter with rationality and safety. This article describes and analyses the different kinds of losses in industrial electrical installations, and some methods will be presented that must be adopted to reduce electrical losses and to use electrical energy with more efficiency in industrial installations
{"title":"Rational and Efficient use of Energy in Industrial Electrical Installations","authors":"J. Carvalho","doi":"10.1109/UPEC.2006.367620","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367620","url":null,"abstract":"Nowadays, energy and in particular, electrical energy is fundamental in all activities, especially, in economic activities and in their development. Actually, electrical energy is the motor of all evolution and development that we witness all over the world. In fact, electrical energy is everywhere, from the smallest home electrical installation to the most complex industrial installation or in any scientific research room. Actually, in the point of view of manufacturers and users, electrical energy must be considered a good thing with great importance and, for this, it must be supplied by the former with quality and used by the latter with rationality and safety. This article describes and analyses the different kinds of losses in industrial electrical installations, and some methods will be presented that must be adopted to reduce electrical losses and to use electrical energy with more efficiency in industrial installations","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116883864","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367594
A. A. Hajjar, M. Mansour
This paper introduces a microprocessor and wavelets based non communication relaying approach dedicated for on line six-phase power transmission lines fault detection, classification and faulted phase(s) selection. The approach uses wavelets for capturing the fault induced high frequency signals of currents and/or voltages. The captured high frequency signals are then used in conjunction with their energies to determine the faulted line and consequently for making a trip decision. For this purpose, a suitable wavelet for on line protection is chosen and tuned at a suitable band of frequencies. In order to investigate a real time performance of the introduced approach a microprocessor based laboratory prototype has been implemented and tested. The obtained results show that the approach is high speed in faulted phase(s) detection and insensitive for the fault inception angle, fault resistance, and line terminals
{"title":"A Microprocessor and Wavelets Based Relaying Approach for on Line Six-Phase Transmission Lines Protection","authors":"A. A. Hajjar, M. Mansour","doi":"10.1109/UPEC.2006.367594","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367594","url":null,"abstract":"This paper introduces a microprocessor and wavelets based non communication relaying approach dedicated for on line six-phase power transmission lines fault detection, classification and faulted phase(s) selection. The approach uses wavelets for capturing the fault induced high frequency signals of currents and/or voltages. The captured high frequency signals are then used in conjunction with their energies to determine the faulted line and consequently for making a trip decision. For this purpose, a suitable wavelet for on line protection is chosen and tuned at a suitable band of frequencies. In order to investigate a real time performance of the introduced approach a microprocessor based laboratory prototype has been implemented and tested. The obtained results show that the approach is high speed in faulted phase(s) detection and insensitive for the fault inception angle, fault resistance, and line terminals","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126979470","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367608
Zengli Yang, X. Duan
This paper proposes a new systematic approach for calculating settings of all zones of ground distance relays when mutual coupling effect is considered. The proposed zone 1 setting calculation method is based on the apparent impedance seen by the ground distance relays when faults are simulated on the assumed reach of zone 1. Also, it presents a method for calculating zone 2 and zone 3 settings based on the composite current assistance parameter and apparent impedance in the paper. It is shown that the proposed systematic method guarantees the coverage of zone 1 and increases the sensitivity and accuracy of zone 2 and zone 3 settings
{"title":"A New Approach for Calculating Settings of Distance Relays Considering Mutual Coupling Effect","authors":"Zengli Yang, X. Duan","doi":"10.1109/UPEC.2006.367608","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367608","url":null,"abstract":"This paper proposes a new systematic approach for calculating settings of all zones of ground distance relays when mutual coupling effect is considered. The proposed zone 1 setting calculation method is based on the apparent impedance seen by the ground distance relays when faults are simulated on the assumed reach of zone 1. Also, it presents a method for calculating zone 2 and zone 3 settings based on the composite current assistance parameter and apparent impedance in the paper. It is shown that the proposed systematic method guarantees the coverage of zone 1 and increases the sensitivity and accuracy of zone 2 and zone 3 settings","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"99 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120904332","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367549
Mohd. Khairil Rahmat, S. Jovanovic, K. L. Lo
The unreliability of public power lines have led to the need of uninterruptible power supply (UPS). Utility power failures will cause unacceptably high risk to the profitability, existence and growth of the vital aspect of business that depends heavily on uninterrupted power supply. For this reason it is important to develop a method to estimate the reliability of such system, to ensure that it will perform satisfactorily when needed. This paper describes and discusses an approach to predict the reliability parameters of the UPS system using the probability tree method. Important UPS reliability parameters such as failure rates (lambda), mean time between failures (MTBF), and reliability (R), can be obtained from this method. These quantitative reliability parameters can play an essential role in selection and application of the UPS. The method was applied to different topologies of UPS systems and comparisons were made between the results obtained form probability tree method and the reliability block diagram (RBD) method
{"title":"Reliability Modelling of Uninterruptible Power Supply Using Probability Tree Method","authors":"Mohd. Khairil Rahmat, S. Jovanovic, K. L. Lo","doi":"10.1109/UPEC.2006.367549","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367549","url":null,"abstract":"The unreliability of public power lines have led to the need of uninterruptible power supply (UPS). Utility power failures will cause unacceptably high risk to the profitability, existence and growth of the vital aspect of business that depends heavily on uninterrupted power supply. For this reason it is important to develop a method to estimate the reliability of such system, to ensure that it will perform satisfactorily when needed. This paper describes and discusses an approach to predict the reliability parameters of the UPS system using the probability tree method. Important UPS reliability parameters such as failure rates (lambda), mean time between failures (MTBF), and reliability (R), can be obtained from this method. These quantitative reliability parameters can play an essential role in selection and application of the UPS. The method was applied to different topologies of UPS systems and comparisons were made between the results obtained form probability tree method and the reliability block diagram (RBD) method","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121184328","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367714
M. Conlon, A. Mumtaz
The significant increase in wind power connected to supply networks introduces additional issues in the assessment of network capacity. This paper looks at the assessment of loading on transmission network elements where significant wind generation capacity has been installed. Due to the stochastic nature of wind generation, extreme conditions (e.g. maximum wind generation, minimum load) can occur, but the probability of the occurrence of such conditions is also important. The probability analysis of the effect of wind power on a transmission networks is investigated using Monte Carlo simulation
{"title":"Investigation of Network Constraints in Transmission Networks with Significant Wind Generation Capacity","authors":"M. Conlon, A. Mumtaz","doi":"10.1109/UPEC.2006.367714","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367714","url":null,"abstract":"The significant increase in wind power connected to supply networks introduces additional issues in the assessment of network capacity. This paper looks at the assessment of loading on transmission network elements where significant wind generation capacity has been installed. Due to the stochastic nature of wind generation, extreme conditions (e.g. maximum wind generation, minimum load) can occur, but the probability of the occurrence of such conditions is also important. The probability analysis of the effect of wind power on a transmission networks is investigated using Monte Carlo simulation","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"35 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116276292","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367748
T. K. Panigrahi, A. Saha, S. Chowdhury, S. Chowdhury, N. Chakraborty, Y. Song, S. Byabortta
This paper describes dynamic modeling of a microgrid operating in grid-connected mode. The model is applied to a distributed utility grid that uses three gas turbine based distributed generators (D.G.), generating power at distribution voltage level (415 volts) and these are connected to a MV grid through a transformer. These DGs are dynamic devices & hence affect the dynamic behavior of the distribution grid. The transient simulation in this paper is done using MATLAB SIMULINK. Analysis of the transient behavior of DGs in simulated environment is important for control of generators during faults, generator trip, surges and switching conditions
{"title":"A Simulink Based Microgrid Modelling & Operational Analysis Using Distributed Generators","authors":"T. K. Panigrahi, A. Saha, S. Chowdhury, S. Chowdhury, N. Chakraborty, Y. Song, S. Byabortta","doi":"10.1109/UPEC.2006.367748","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367748","url":null,"abstract":"This paper describes dynamic modeling of a microgrid operating in grid-connected mode. The model is applied to a distributed utility grid that uses three gas turbine based distributed generators (D.G.), generating power at distribution voltage level (415 volts) and these are connected to a MV grid through a transformer. These DGs are dynamic devices & hence affect the dynamic behavior of the distribution grid. The transient simulation in this paper is done using MATLAB SIMULINK. Analysis of the transient behavior of DGs in simulated environment is important for control of generators during faults, generator trip, surges and switching conditions","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128025052","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367530
M. Ghaleh-Golabi, R. Dashti
Like most of available industrial systems, power system does not have constant parameters; thus changes with time. Hence, when studying a power system dynamically, time invariant system behaviour could not be assumed. Therefore, for stabilization of the output voltage at the terminals of a generator, an advanced dynamic control system is required. In this paper, the use of self-tuning regulators for controlling the generator's voltage and improving dynamic performance of the system is suggested. This method, in which control laws are obtained by assigning system poles, is based on continuous identification of the variables of the system state.
{"title":"Voltage Stabilization of Synchronous Generator by Self-Tuning Controller","authors":"M. Ghaleh-Golabi, R. Dashti","doi":"10.1109/UPEC.2006.367530","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367530","url":null,"abstract":"Like most of available industrial systems, power system does not have constant parameters; thus changes with time. Hence, when studying a power system dynamically, time invariant system behaviour could not be assumed. Therefore, for stabilization of the output voltage at the terminals of a generator, an advanced dynamic control system is required. In this paper, the use of self-tuning regulators for controlling the generator's voltage and improving dynamic performance of the system is suggested. This method, in which control laws are obtained by assigning system poles, is based on continuous identification of the variables of the system state.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128114240","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367717
M. Djarallah, B. Azoui
The progressive tendency, of the photovoltaic (PV) system connected to the electrical grid, is establishing new applications, in a way that, such system has to be optimised. Nowadays, many of these configurations start to bring benefits into the electrical network, such as: export/import of real and reactive powers, quick fix to shortages in power when used with storage equipment, active power mains harmonics filtering, and reduction of greenhouse emission and environment friendly power generation source. In this context, this paper deals with modelling and analysis of a grid connected PV system power flow, with the consideration of chain parasitic resistances and inductances. As a result, this leads to understand and infer various possible operating modes and system design concept
{"title":"Grid Connected Interactive Photovoltaic Power Flow Analysis: A Technique for System Operation Comprehension and Sizing","authors":"M. Djarallah, B. Azoui","doi":"10.1109/UPEC.2006.367717","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367717","url":null,"abstract":"The progressive tendency, of the photovoltaic (PV) system connected to the electrical grid, is establishing new applications, in a way that, such system has to be optimised. Nowadays, many of these configurations start to bring benefits into the electrical network, such as: export/import of real and reactive powers, quick fix to shortages in power when used with storage equipment, active power mains harmonics filtering, and reduction of greenhouse emission and environment friendly power generation source. In this context, this paper deals with modelling and analysis of a grid connected PV system power flow, with the consideration of chain parasitic resistances and inductances. As a result, this leads to understand and infer various possible operating modes and system design concept","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125637679","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367540
Z. Ling, Yan Huimin, Li Bangyun, Cao Yonggang
As deficiency of conventional methods of winding deformation monitoring of transformer, a new way for monitoring winding deformation is proposed. After identifying parameters of transformer such as short-circuit reactance and resistance with parameter identification method, on-line winding deformation monitoring of transformer is actualized according to the change of parameter when winding deformation happens. A system of on-line winding deformation monitoring of transformer is simulated, the result proves this method's efficiency
{"title":"Research on On-Line Winding Deformation Monitoring of Power Transformer Based on Parameter Identification","authors":"Z. Ling, Yan Huimin, Li Bangyun, Cao Yonggang","doi":"10.1109/UPEC.2006.367540","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367540","url":null,"abstract":"As deficiency of conventional methods of winding deformation monitoring of transformer, a new way for monitoring winding deformation is proposed. After identifying parameters of transformer such as short-circuit reactance and resistance with parameter identification method, on-line winding deformation monitoring of transformer is actualized according to the change of parameter when winding deformation happens. A system of on-line winding deformation monitoring of transformer is simulated, the result proves this method's efficiency","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122246416","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：