Pub Date : 2006-09-01DOI: 10.1109/UPEC.2006.367742
T. Toyoshima, G. Shirai, T. Tsukui, M. Matsubara, G. Fujita, W. Chen, R. Yokoyama, K. Koyanagi, T. Funabashi
Recently, solar energy generation and wind power generation have been introduced to electric power system. But, as for this natural energy, influence such as frequency fluctuation is exerted on electric power system, which is a fundamental problem in operation of a small grid system such as micro-grid. These systems should provide appropriate power quality compared to a large grid. However, using the telecommunication line for monitoring and controlling the system devices is costly, as an alternative method, autonomous distribution control that enables local power supply and demand control is also required in design and operational stage. This paper discusses benefits of these methods conducting cost evaluation
{"title":"Autonomous Distributed Control of Micro Grid with Diesel Generator","authors":"T. Toyoshima, G. Shirai, T. Tsukui, M. Matsubara, G. Fujita, W. Chen, R. Yokoyama, K. Koyanagi, T. Funabashi","doi":"10.1109/UPEC.2006.367742","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367742","url":null,"abstract":"Recently, solar energy generation and wind power generation have been introduced to electric power system. But, as for this natural energy, influence such as frequency fluctuation is exerted on electric power system, which is a fundamental problem in operation of a small grid system such as micro-grid. These systems should provide appropriate power quality compared to a large grid. However, using the telecommunication line for monitoring and controlling the system devices is costly, as an alternative method, autonomous distribution control that enables local power supply and demand control is also required in design and operational stage. This paper discusses benefits of these methods conducting cost evaluation","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"42 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":"123794604","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.2006.367705
P. Constantinou, P. Mellor, P. Wilcox
This paper develops an equivalent circuit of an electromagnetic velocity damped resonant generator that can be used to optimise the power available from such a system. The main focus is on the development of an analytical model of the electromagnetic coupling coefficient that links the mechanical and electrical components of the system. It is shown to be dependant on the position of the coil and is validated against experimental tests. Models for the remaining components, taken from literature, are also described
{"title":"Model of an Electromagnetic Vibration Generator","authors":"P. Constantinou, P. Mellor, P. Wilcox","doi":"10.1109/UPEC.2006.367705","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367705","url":null,"abstract":"This paper develops an equivalent circuit of an electromagnetic velocity damped resonant generator that can be used to optimise the power available from such a system. The main focus is on the development of an analytical model of the electromagnetic coupling coefficient that links the mechanical and electrical components of the system. It is shown to be dependant on the position of the coil and is validated against experimental tests. Models for the remaining components, taken from literature, are also described","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"90 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":"114710440","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.2006.367712
H. El-Helw, S. Tennakon, N. Shammas
Recently, generation of electricity using wind power has received considerable attention worldwide. During the last two decades, the production of wind turbines has grown in size from 20 KW to 3.6 MW. There currently exist various competing technologies for wind generator systems, whose differences lie in the complexity, cost, and degree of control over the system characteristics. Induction generators are more attractive than synchronous generators as wind turbine generators, due to their low cost, ruggedness, and the need for little or no maintenance. Unfortunately, induction generators require reactive power from the grid to operate and therefore some means of compensation is required, specially, in the case of large wind farm connected to a weak power system.
{"title":"Compensation Methods in Wind Energy Systems","authors":"H. El-Helw, S. Tennakon, N. Shammas","doi":"10.1109/UPEC.2006.367712","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367712","url":null,"abstract":"Recently, generation of electricity using wind power has received considerable attention worldwide. During the last two decades, the production of wind turbines has grown in size from 20 KW to 3.6 MW. There currently exist various competing technologies for wind generator systems, whose differences lie in the complexity, cost, and degree of control over the system characteristics. Induction generators are more attractive than synchronous generators as wind turbine generators, due to their low cost, ruggedness, and the need for little or no maintenance. Unfortunately, induction generators require reactive power from the grid to operate and therefore some means of compensation is required, specially, in the case of large wind farm connected to a weak power system.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"215 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":"124076411","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.2006.367629
T. El-fetoh
This paper presents the procedures required to determine the locations and sizes of multiple-active power filters (APFs) to reduce harmonic distortion in a power system with harmonic sources. The objective function is to minimize the APFs injection currents while satisfying harmonic voltages, total harmonic voltage distortions within IEEE-519 recommended limits and the maximum rating current limit of each installed APF. The APFs are located at the points having harmonic sources or higher harmonic distortions, while minimizing injection currents. The ANN Model is developed to determine size and location of APF. A typical 28-bus distribution system is selected to verify the validity of the proposed procedures
{"title":"Harmonic Intelligent Control with Active Power Filter","authors":"T. El-fetoh","doi":"10.1109/UPEC.2006.367629","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367629","url":null,"abstract":"This paper presents the procedures required to determine the locations and sizes of multiple-active power filters (APFs) to reduce harmonic distortion in a power system with harmonic sources. The objective function is to minimize the APFs injection currents while satisfying harmonic voltages, total harmonic voltage distortions within IEEE-519 recommended limits and the maximum rating current limit of each installed APF. The APFs are located at the points having harmonic sources or higher harmonic distortions, while minimizing injection currents. The ANN Model is developed to determine size and location of APF. A typical 28-bus distribution system is selected to verify the validity of the proposed procedures","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"13 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":"127958681","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.2006.367767
E. Hreinsson
An activity based distribution cost model, APOWER, is applied to a rural distribution system, where multiple classes or bilateral contracts of energy are assumed. In particular, primary and secondary energy classes are considered where these classes share both system costs and benefits. Also, the cost of losses is shared by explicitly treating power and energy losses in the model. Different approaches to sharing other cost factors are suggested. The model is tested on an actual rural distribution network in Iceland and delivery and distribution costs are compared, with respect to rural and community delivery, voltage levels and bilateral contracts. Results can form a basis for designing transmission and distribution tariffs for network companies and can help shape the regulating environment for these companies by developing a unified framework in distribution system cost estimation
{"title":"Cost Analysis in a Rural Power Distribution System","authors":"E. Hreinsson","doi":"10.1109/UPEC.2006.367767","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367767","url":null,"abstract":"An activity based distribution cost model, APOWER, is applied to a rural distribution system, where multiple classes or bilateral contracts of energy are assumed. In particular, primary and secondary energy classes are considered where these classes share both system costs and benefits. Also, the cost of losses is shared by explicitly treating power and energy losses in the model. Different approaches to sharing other cost factors are suggested. The model is tested on an actual rural distribution network in Iceland and delivery and distribution costs are compared, with respect to rural and community delivery, voltage levels and bilateral contracts. Results can form a basis for designing transmission and distribution tariffs for network companies and can help shape the regulating environment for these companies by developing a unified framework in distribution system cost estimation","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":"131083017","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.2006.367542
A. Dastfan, M. Haghshenas
In this paper, design and simulation of a three-phase, 400 Hz power supply based on a matrix converter topology and its new control system are given. A new control method based on the direct modulation technique, which can perfectly work with input voltage unbalance, has been proposed. Theory analysis and simulation results for the proposed power supply are presented in the paper to demonstrate the performance of this control method under input unbalanced voltages. The simulation results show that output voltages unbalanced factor is decreased to 1% and their THDs are less than 2% which is an improvement compare to SVM and conventional direct modulation techniques.
{"title":"Design and Simulation of A Power Supply Based on A Matrix Converter Under Unbalanced Input Voltage","authors":"A. Dastfan, M. Haghshenas","doi":"10.1109/UPEC.2006.367542","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367542","url":null,"abstract":"In this paper, design and simulation of a three-phase, 400 Hz power supply based on a matrix converter topology and its new control system are given. A new control method based on the direct modulation technique, which can perfectly work with input voltage unbalance, has been proposed. Theory analysis and simulation results for the proposed power supply are presented in the paper to demonstrate the performance of this control method under input unbalanced voltages. The simulation results show that output voltages unbalanced factor is decreased to 1% and their THDs are less than 2% which is an improvement compare to SVM and conventional direct modulation techniques.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"2 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":"129945750","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.2006.367766
Jiang Tan, C. Arnold
Analytical results using a single H-bridge multi level voltage reinjection-voltage source converter (MLVR-VSC) model are presented. They demonstrate the controllability of the fundamental voltage using notches in the reinjection waveforms. A comparison of the gain in controllability and the corresponding increase in harmonic content is presented.
{"title":"Fundamental Voltage Modulation for a High Power Voltage Source Converter","authors":"Jiang Tan, C. Arnold","doi":"10.1109/UPEC.2006.367766","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367766","url":null,"abstract":"Analytical results using a single H-bridge multi level voltage reinjection-voltage source converter (MLVR-VSC) model are presented. They demonstrate the controllability of the fundamental voltage using notches in the reinjection waveforms. A comparison of the gain in controllability and the corresponding increase in harmonic content is presented.","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":"129962912","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.2006.367539
Yang Qiu-rong, Duan Xian-zhong, Liu Xin, Wang Xue-feng
There is not a sound method which can solve the compensation problem of the distributed capacitance current in 10 kV railway cable-only continuous power transmission line. The feasibilities and disadvantages of the two present technologies are analyzed and discussed, the one of which is the grounded wye-reactor, and the other is using the neutral resonance grounding system. A novel optimum compensation scheme that combines the two technologies to solve this problem is proposed. The power factor at the head and the voltage at the end of the line and the single-phase grounding current are modeled and analyzed in this paper. It is proved that the compensation to the inductive reactive power is necessary to the correction of the power factor
{"title":"Influence of Distributed Capacitance in Railway Cable-Only Continuous Power Transmission Line and Its Compensation","authors":"Yang Qiu-rong, Duan Xian-zhong, Liu Xin, Wang Xue-feng","doi":"10.1109/UPEC.2006.367539","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367539","url":null,"abstract":"There is not a sound method which can solve the compensation problem of the distributed capacitance current in 10 kV railway cable-only continuous power transmission line. The feasibilities and disadvantages of the two present technologies are analyzed and discussed, the one of which is the grounded wye-reactor, and the other is using the neutral resonance grounding system. A novel optimum compensation scheme that combines the two technologies to solve this problem is proposed. The power factor at the head and the voltage at the end of the line and the single-phase grounding current are modeled and analyzed in this paper. It is proved that the compensation to the inductive reactive power is necessary to the correction of the power factor","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"43 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":"127925118","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.2006.367640
W. Stemmet, G. Atkinson-Hope
The focus of this paper is to define and identify a harmonic offender and develop a simulation method to investigate this concept in an interconnected power system containing multiple six-pulse drives. The IEEE 519 recommended practice provides indices to determine distortion as well as recommending limits within which systems containing harmonics should operate. However, no specific method is provided for determining whether or not the harmonic spectrum magnitudes and phase angles of a new drive that is to be installed in a system that already contains more than one six-pulse drive will be a harmonic offender or not. When only one drive is present in a system, its harmonic spectrum phase angles has no effect on the distortion index results. Only harmonic magnitudes influence distortion. However, when multiple drives are connected in a system, the harmonic currents from each source add vectorially at the point of common coupling. As a result, the harmonic distortion is highly dependant on the method in which the harmonic current spectrum angles are modelled. Whether a drive is a harmonic offender or not in a given system thus depends upon the modelling of drives taking into account the harmonic spectrum phase angles. To enhance the understanding of modelling harmonic spectrum phase angles, the two methods (voltage and current method) are compared and a recommendation as to which method should be used is made. Three case studies are conducted to show the usefulness of the developed method.
{"title":"Simulation Method for Identifying A Harmonic Offender in a Power System Containing Multiple Six-Pulse Drives","authors":"W. Stemmet, G. Atkinson-Hope","doi":"10.1109/UPEC.2006.367640","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367640","url":null,"abstract":"The focus of this paper is to define and identify a harmonic offender and develop a simulation method to investigate this concept in an interconnected power system containing multiple six-pulse drives. The IEEE 519 recommended practice provides indices to determine distortion as well as recommending limits within which systems containing harmonics should operate. However, no specific method is provided for determining whether or not the harmonic spectrum magnitudes and phase angles of a new drive that is to be installed in a system that already contains more than one six-pulse drive will be a harmonic offender or not. When only one drive is present in a system, its harmonic spectrum phase angles has no effect on the distortion index results. Only harmonic magnitudes influence distortion. However, when multiple drives are connected in a system, the harmonic currents from each source add vectorially at the point of common coupling. As a result, the harmonic distortion is highly dependant on the method in which the harmonic current spectrum angles are modelled. Whether a drive is a harmonic offender or not in a given system thus depends upon the modelling of drives taking into account the harmonic spectrum phase angles. To enhance the understanding of modelling harmonic spectrum phase angles, the two methods (voltage and current method) are compared and a recommendation as to which method should be used is made. Three case studies are conducted to show the usefulness of the developed method.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"44 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":"128212299","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.2006.367777
R. Gazey, S. Salman
This paper will report on the experience relating to the development and operation of an innovative stand-alone sustainable energy system known as the PURE project. The PURE project has been developed by the Unst Partnership as part of its remit to address the decline in the Unst economy and population. The PURE energy system has been developed alongside a knowledge transfer partnership (KTP), which is supported by the UK's Department of Trade and Industry and executed by siGEN in collaboration with The Robert Gordon University.
{"title":"Pure Project Energy System Development and Operation","authors":"R. Gazey, S. Salman","doi":"10.1109/UPEC.2006.367777","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367777","url":null,"abstract":"This paper will report on the experience relating to the development and operation of an innovative stand-alone sustainable energy system known as the PURE project. The PURE project has been developed by the Unst Partnership as part of its remit to address the decline in the Unst economy and population. The PURE energy system has been developed alongside a knowledge transfer partnership (KTP), which is supported by the UK's Department of Trade and Industry and executed by siGEN in collaboration with The Robert Gordon University.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"25 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":"122853611","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}
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