Pub Date : 1995-11-21DOI: 10.1109/EMPD.1995.500780
Wei Jing-Yuan, Y. Smeers, E. Canon
An integrated market organized by regulated electric utilities is modelled. It is assumed that, given a price vector for the exchange of electricity between each pair of neighboring utilities, utilities independently maximize their own domestic social welfare subject to the zero profit constraint. An equilibrium price vector for exchanges among utilities is defined as the one which clears the exchanges for all pair of business partners. A single piecewise linear model is formulated for computing market equilibria. The model is used to simulate the electricity supply market organised by 11 western European countries.
{"title":"A bargaining model of regulated markets' integration with an application to electricity supply market","authors":"Wei Jing-Yuan, Y. Smeers, E. Canon","doi":"10.1109/EMPD.1995.500780","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500780","url":null,"abstract":"An integrated market organized by regulated electric utilities is modelled. It is assumed that, given a price vector for the exchange of electricity between each pair of neighboring utilities, utilities independently maximize their own domestic social welfare subject to the zero profit constraint. An equilibrium price vector for exchanges among utilities is defined as the one which clears the exchanges for all pair of business partners. A single piecewise linear model is formulated for computing market equilibria. The model is used to simulate the electricity supply market organised by 11 western European countries.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134355938","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500800
Sei Chan, A. Omar
This paper describes the application of a new simple voltage-boosting feature to a split-supply SR (switched-reluctance) motor inverter. As its name implies, the SR motor always operates in switching mode and has distinct motoring and generating rotor angular regions. The effectiveness of the energy conversion process of the SR motor depends basically on the ability of its inverter to inject adequate current during the positive-torque angular region and to reduce the current to a negligible value during the negative-torque angular region. The modified inverter effectively generates boost voltages for accelerating current build-up and decay and hence enhances the performance of SR motor drives. Benefits of the added boosting include: higher average current; better energy recovery during commutation; and a wider feasible speed range. This paper assesses the implications of the boost feature on inverter cost and performance. A time-stepping simulation procedure which includes the modelling of current overlapping between phases is presented together with simulation results.
{"title":"A modified split-supply switched-reluctance drive inverter","authors":"Sei Chan, A. Omar","doi":"10.1109/EMPD.1995.500800","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500800","url":null,"abstract":"This paper describes the application of a new simple voltage-boosting feature to a split-supply SR (switched-reluctance) motor inverter. As its name implies, the SR motor always operates in switching mode and has distinct motoring and generating rotor angular regions. The effectiveness of the energy conversion process of the SR motor depends basically on the ability of its inverter to inject adequate current during the positive-torque angular region and to reduce the current to a negligible value during the negative-torque angular region. The modified inverter effectively generates boost voltages for accelerating current build-up and decay and hence enhances the performance of SR motor drives. Benefits of the added boosting include: higher average current; better energy recovery during commutation; and a wider feasible speed range. This paper assesses the implications of the boost feature on inverter cost and performance. A time-stepping simulation procedure which includes the modelling of current overlapping between phases is presented together with simulation results.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131879999","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500734
F. Dahlfors, J. Pilling
The traditional energy management system (EMS) has, until recently, remained isolated from other electric utility information systems, putting limits on its potential to the power company. Today, information technology (IT) can offer efficient and cost-justified solutions for the integration of these resources, and the value of IT is being increasingly recognized by many power companies. The current wave of privatisation, deregulation and market orientation of the electric energy market in many parts of the world has created new challenges. Power companies are now cast in the role of energy service companies instead of energy suppliers. The increasing competition and the requirements for improved overall economy and quality of services is accelerating the demand for more accurate and up-to-date information. Information has become a strategic resource. To exploit its full potential for all users, the keyword is integration. Technical, business and administrative applications need to be viewed in a corporate wide perspective. A revised IT strategy has become a tool for positioning the power company in a competitive market.
{"title":"Integrated information systems in a privatized and deregulated electricity market","authors":"F. Dahlfors, J. Pilling","doi":"10.1109/EMPD.1995.500734","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500734","url":null,"abstract":"The traditional energy management system (EMS) has, until recently, remained isolated from other electric utility information systems, putting limits on its potential to the power company. Today, information technology (IT) can offer efficient and cost-justified solutions for the integration of these resources, and the value of IT is being increasingly recognized by many power companies. The current wave of privatisation, deregulation and market orientation of the electric energy market in many parts of the world has created new challenges. Power companies are now cast in the role of energy service companies instead of energy suppliers. The increasing competition and the requirements for improved overall economy and quality of services is accelerating the demand for more accurate and up-to-date information. Information has become a strategic resource. To exploit its full potential for all users, the keyword is integration. Technical, business and administrative applications need to be viewed in a corporate wide perspective. A revised IT strategy has become a tool for positioning the power company in a competitive market.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129659985","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500710
H. H. Wong, J. C. Flores, Ying Fang, R.P. Baldevia
This paper describes the development of a new automatic underfrequency load shedding scheme on the Guam Power Authority's (GPA) system using a transient stability simulation program. The new scheme strives to minimize the amount of load shed by selecting frequency settings based on the severity of generation or load unbalance and the availability of spinning reserves. The fast speed of frequency decay due to loss of generation is shown to be particularly pronounced in an island system, requiring more careful design of any load shedding scheme than large interconnected systems. The use of a well-prepared transient stability study model allows the simulation of specific contingencies and the fine-tuning of load shedding strategies for optimality. The trade-off between equipment protection, customer service availability, and practical operating issues, such as, synchronization of generators to the grid, are discussed.
{"title":"Guam Power Authority automatic underfrequency load shedding study","authors":"H. H. Wong, J. C. Flores, Ying Fang, R.P. Baldevia","doi":"10.1109/EMPD.1995.500710","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500710","url":null,"abstract":"This paper describes the development of a new automatic underfrequency load shedding scheme on the Guam Power Authority's (GPA) system using a transient stability simulation program. The new scheme strives to minimize the amount of load shed by selecting frequency settings based on the severity of generation or load unbalance and the availability of spinning reserves. The fast speed of frequency decay due to loss of generation is shown to be particularly pronounced in an island system, requiring more careful design of any load shedding scheme than large interconnected systems. The use of a well-prepared transient stability study model allows the simulation of specific contingencies and the fine-tuning of load shedding strategies for optimality. The trade-off between equipment protection, customer service availability, and practical operating issues, such as, synchronization of generators to the grid, are discussed.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129786292","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500717
R. Billinton, A. Sankarakrishnan, S. Adzanu, J. Satish
A wide range of techniques have been proposed for adequacy evaluation in composite generation and transmission systems. This paper utilizes a test system to illustrate and compare the adequacy indices obtained using an analytical approach and a Monte Carlo simulation method. The paper presents the outage costs at the load buses and for the overall system using the cost of interruption data. The reliability worth implications of nonutility generation (NUG) injected into a composite generation and transmission system are illustrated by application to the test system.
{"title":"Adequacy assessment and worth evaluation and its application to NUG planning in composite generation and transmission systems","authors":"R. Billinton, A. Sankarakrishnan, S. Adzanu, J. Satish","doi":"10.1109/EMPD.1995.500717","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500717","url":null,"abstract":"A wide range of techniques have been proposed for adequacy evaluation in composite generation and transmission systems. This paper utilizes a test system to illustrate and compare the adequacy indices obtained using an analytical approach and a Monte Carlo simulation method. The paper presents the outage costs at the load buses and for the overall system using the cost of interruption data. The reliability worth implications of nonutility generation (NUG) injected into a composite generation and transmission system are illustrated by application to the test system.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047889","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500723
M. Rahman, R. Shuttleworth
Thermoelectric generators use the Seebeck effect to produce electrical power from a temperature difference caused by heat energy flow. In this paper the principle of using thermoelectrically converted heat energy for powering portable electronic equipment or charging its battery has been investigated for a lap-top computer. The thermoelectric battery charger developed, consists of a thermoelectric converter system, powered from butane gas, and a DC-to-DC boost up converter. Both the sub-assemblies are designed using computer models and constructed. The unit produces an output power of 5 watts which doubles the life of the lap-top computer's internal batteries.
{"title":"Thermoelectric power generation for battery charging","authors":"M. Rahman, R. Shuttleworth","doi":"10.1109/EMPD.1995.500723","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500723","url":null,"abstract":"Thermoelectric generators use the Seebeck effect to produce electrical power from a temperature difference caused by heat energy flow. In this paper the principle of using thermoelectrically converted heat energy for powering portable electronic equipment or charging its battery has been investigated for a lap-top computer. The thermoelectric battery charger developed, consists of a thermoelectric converter system, powered from butane gas, and a DC-to-DC boost up converter. Both the sub-assemblies are designed using computer models and constructed. The unit produces an output power of 5 watts which doubles the life of the lap-top computer's internal batteries.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134571787","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500810
Li Yongli, H. Jiali, Duan Yuqian
A neural network method used to identify the operating states of transformers has been proposed and established. It is superior to the traditional transformer protective relays and can correctly identify, within half cycle from the fault inception, the internal faults, magnetizing inrush current state, external faults and switching on internal faults of a no-load transformer. In addition, this method has broad availability and high fault-tolerant ability. A lot of simulations have demonstrated its superiority.
{"title":"Application of neural network to microprocessor-based transformer protective relaying","authors":"Li Yongli, H. Jiali, Duan Yuqian","doi":"10.1109/EMPD.1995.500810","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500810","url":null,"abstract":"A neural network method used to identify the operating states of transformers has been proposed and established. It is superior to the traditional transformer protective relays and can correctly identify, within half cycle from the fault inception, the internal faults, magnetizing inrush current state, external faults and switching on internal faults of a no-load transformer. In addition, this method has broad availability and high fault-tolerant ability. A lot of simulations have demonstrated its superiority.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127976661","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500756
Dai-Seub Choi, Chang-Suk Kim, J. Hasegawa
Network reconfiguration in distribution systems is realized by changing the status of sectionalizing switches, and is usually done for loss reduction or for load balancing in the power system. This paper presents a new method which applies a genetic algorithm to determine which sectionalizing switch to operate in order to solve the distribution system loss minimization reconfiguration problem. In addition, the proposed method introduces a new limited life feature for performing natural selection of individuals. Simulations are carried out in order to verify the effectiveness of the proposed method. These results show that the proposed method is effective in dealing with the problems of homogeneity and genetic drift associated with the population in the initial state.
{"title":"An application of genetic algorithms to the network reconfiguration in distribution for loss minimization and load balancing problem. II","authors":"Dai-Seub Choi, Chang-Suk Kim, J. Hasegawa","doi":"10.1109/EMPD.1995.500756","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500756","url":null,"abstract":"Network reconfiguration in distribution systems is realized by changing the status of sectionalizing switches, and is usually done for loss reduction or for load balancing in the power system. This paper presents a new method which applies a genetic algorithm to determine which sectionalizing switch to operate in order to solve the distribution system loss minimization reconfiguration problem. In addition, the proposed method introduces a new limited life feature for performing natural selection of individuals. Simulations are carried out in order to verify the effectiveness of the proposed method. These results show that the proposed method is effective in dealing with the problems of homogeneity and genetic drift associated with the population in the initial state.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"50 14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121282976","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500784
Y. Yamagata, K. Tanaka, Y. Terasawa, H. Aoyagi, K. Nojima, I. Hioki, H. Murase, T. Yokota
Very fast transients (VFTs) in a grounding circuit of a 1000 kV class high speed grounding switch (HSGS) were investigated. Referring to the VFT voltage levels estimated by the investigation, the structure of their grounding circuit was designed. The suitability of the design was confirmed by a low voltage test and a high voltage test, which were carried out using the HSGS for a field test.
{"title":"Very fast transients in 1000 kV HSGS grounding circuit","authors":"Y. Yamagata, K. Tanaka, Y. Terasawa, H. Aoyagi, K. Nojima, I. Hioki, H. Murase, T. Yokota","doi":"10.1109/EMPD.1995.500784","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500784","url":null,"abstract":"Very fast transients (VFTs) in a grounding circuit of a 1000 kV class high speed grounding switch (HSGS) were investigated. Referring to the VFT voltage levels estimated by the investigation, the structure of their grounding circuit was designed. The suitability of the design was confirmed by a low voltage test and a high voltage test, which were carried out using the HSGS for a field test.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"258 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125794721","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 : 1995-11-21DOI: 10.1109/EMPD.1995.500799
N. Naoe
This paper presents a demonstration of a permanent magnet generator with capacitors. In this paper, the possibility of realizing the small voltage regulation of such generators is increased. The permanent magnet generator with capacitors has a voltage compensation function. In order to determine whether this generator is feasible, the author has tested various characteristics of the machine through experiments with a prototype generator.
{"title":"Fundamental characteristics of voltage compensation type permanent-magnet generator","authors":"N. Naoe","doi":"10.1109/EMPD.1995.500799","DOIUrl":"https://doi.org/10.1109/EMPD.1995.500799","url":null,"abstract":"This paper presents a demonstration of a permanent magnet generator with capacitors. In this paper, the possibility of realizing the small voltage regulation of such generators is increased. The permanent magnet generator with capacitors has a voltage compensation function. In order to determine whether this generator is feasible, the author has tested various characteristics of the machine through experiments with a prototype generator.","PeriodicalId":447674,"journal":{"name":"Proceedings 1995 International Conference on Energy Management and Power Delivery EMPD '95","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126653533","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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