Pub Date : 2000-04-04DOI: 10.1109/DRPT.2000.855742
T. Tachikawa, H. Kita, H. Sugihara, K. Nishiya, J. Hasegawa
Under a deregulated environment, power system operators such as utilities have to expand and reinforce the transmission network so that all participants can utilize the network equally and fairly. However, it is difficult for the power system operators to forecast how often the network will be utilized or which bus the users will connect to. Therefore, more uncertain factors exist in the transmission planning problem under a deregulated environment. This paper presents a method for evaluating the maximum power which can be injected to a bus and identifying some transmission lines which result in the bottleneck under the uncertain conditions. This paper also investigates a probabilistic load flow to consider the statistic characteristics of load change and line fault occurrence.
{"title":"A study of transmission planning under a deregulated environment in power system","authors":"T. Tachikawa, H. Kita, H. Sugihara, K. Nishiya, J. Hasegawa","doi":"10.1109/DRPT.2000.855742","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855742","url":null,"abstract":"Under a deregulated environment, power system operators such as utilities have to expand and reinforce the transmission network so that all participants can utilize the network equally and fairly. However, it is difficult for the power system operators to forecast how often the network will be utilized or which bus the users will connect to. Therefore, more uncertain factors exist in the transmission planning problem under a deregulated environment. This paper presents a method for evaluating the maximum power which can be injected to a bus and identifying some transmission lines which result in the bottleneck under the uncertain conditions. This paper also investigates a probabilistic load flow to consider the statistic characteristics of load change and line fault occurrence.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133717817","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855702
L. P. Prado, F. Soto
This paper gives a brief description of the concepts and goals of the electricity industry reforms process with some references about the Central America context. It presents a brief description of the operation of the electricity control centers in the competitive market as a result of such electricity industry reforms, where two main functions are treated, the system operation and the power exchange administration. Two Central American countries, El Salvador and Nicaragua, are specifically treated in this paper. The electricity industry organisation is given as context for both countries. The electricity control center operation is explained for each of these countries. The operations of the electricity control center in each country are presented using a novel functional model, based in intuitive graphical representation of the information flow. With this model approach the functions change under demands, because the reforms, can be added, placed, linked and documented. Some conclusions about the induced changes at the electricity control centers in El Salvador and Nicaragua are considered.
{"title":"Experiences at the electricity control centers in El Salvador and Nicaragua in the frame of the Electricity Industry Reforms","authors":"L. P. Prado, F. Soto","doi":"10.1109/DRPT.2000.855702","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855702","url":null,"abstract":"This paper gives a brief description of the concepts and goals of the electricity industry reforms process with some references about the Central America context. It presents a brief description of the operation of the electricity control centers in the competitive market as a result of such electricity industry reforms, where two main functions are treated, the system operation and the power exchange administration. Two Central American countries, El Salvador and Nicaragua, are specifically treated in this paper. The electricity industry organisation is given as context for both countries. The electricity control center operation is explained for each of these countries. The operations of the electricity control center in each country are presented using a novel functional model, based in intuitive graphical representation of the information flow. With this model approach the functions change under demands, because the reforms, can be added, placed, linked and documented. Some conclusions about the induced changes at the electricity control centers in El Salvador and Nicaragua are considered.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133775291","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855646
I. Kasikei, M. Darwish, P. Mehta
This paper presents an improved new method for power factor correction and harmonic current reduction using IGBTs and a passive filter which is suitable to compensate rapidly changing loads and reactive power. Furthermore, a single-phase control concept is discussed for simplicity. The results can be implemented in three-phase systems without any problems. It also presents a brief discussion of the main problems in the distribution power systems. The increased use of nonlinear devices cause voltage distortion in the network. This leads to malfunctions of the electric facilities and to costly interruptions of production. The filter circuit parameters are analysed and described. This filter configuration provides an alternative approach to the existing one. According to the test results, the proposed approach can achieve a complete elimination of harmonics.
{"title":"A new contribution into the improvement of power factor correction","authors":"I. Kasikei, M. Darwish, P. Mehta","doi":"10.1109/DRPT.2000.855646","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855646","url":null,"abstract":"This paper presents an improved new method for power factor correction and harmonic current reduction using IGBTs and a passive filter which is suitable to compensate rapidly changing loads and reactive power. Furthermore, a single-phase control concept is discussed for simplicity. The results can be implemented in three-phase systems without any problems. It also presents a brief discussion of the main problems in the distribution power systems. The increased use of nonlinear devices cause voltage distortion in the network. This leads to malfunctions of the electric facilities and to costly interruptions of production. The filter circuit parameters are analysed and described. This filter configuration provides an alternative approach to the existing one. According to the test results, the proposed approach can achieve a complete elimination of harmonics.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134120220","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855721
J. Bialek
In this paper application of the tracing methodology to the transmission pricing of cross-border trades in Europe has been introduced. The methodology was shown to exhibit the following features: (i) the only information required are the flows in tie-lines connecting the countries; (ii) transmission prices can be calculated in a decentralised manner with only neighbouring countries exchanging information; (iii) transmission charges are based on the actual physical flows and are therefore cost-reflective; (iv) the transmission revenue is exactly recovered; (v) the scheme retains the subsidiarity principle; (vi) the methodology is simple, transparent and very fast; and (vii) the methodology can deal with circular flows. Application of the methodology has been illustrated using the load flows in Europe from 16/12/1998.
{"title":"Tracing-based unifying framework for transmission pricing of cross-border trades in Europe","authors":"J. Bialek","doi":"10.1109/DRPT.2000.855721","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855721","url":null,"abstract":"In this paper application of the tracing methodology to the transmission pricing of cross-border trades in Europe has been introduced. The methodology was shown to exhibit the following features: (i) the only information required are the flows in tie-lines connecting the countries; (ii) transmission prices can be calculated in a decentralised manner with only neighbouring countries exchanging information; (iii) transmission charges are based on the actual physical flows and are therefore cost-reflective; (iv) the transmission revenue is exactly recovered; (v) the scheme retains the subsidiarity principle; (vi) the methodology is simple, transparent and very fast; and (vii) the methodology can deal with circular flows. Application of the methodology has been illustrated using the load flows in Europe from 16/12/1998.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134300036","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855677
J. Kabouris, C. Vournas, S. Efstathiou, G. Manos, G. Contaxis
The deregulation of the electric power industry in Europe is the major issue nowadays. The new environment raises questions concerning all sectors of the electric power industry. Nevertheless, the transmission system is the key point in market development since it puts constraints to the market operation due to technical requirements. Especially, in systems having weak connections among areas, congestion problems arise due to line overloading or to voltage security requirements. This paper focuses on topics concerning voltage security in a deregulated power market and related market issues. Results by the application of the proposed methodology in the Greek Electric Power System (EPS) are presented.
{"title":"Voltage security considerations in an open power market","authors":"J. Kabouris, C. Vournas, S. Efstathiou, G. Manos, G. Contaxis","doi":"10.1109/DRPT.2000.855677","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855677","url":null,"abstract":"The deregulation of the electric power industry in Europe is the major issue nowadays. The new environment raises questions concerning all sectors of the electric power industry. Nevertheless, the transmission system is the key point in market development since it puts constraints to the market operation due to technical requirements. Especially, in systems having weak connections among areas, congestion problems arise due to line overloading or to voltage security requirements. This paper focuses on topics concerning voltage security in a deregulated power market and related market issues. Results by the application of the proposed methodology in the Greek Electric Power System (EPS) are presented.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"470 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133407477","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855705
Y. Z. Sun, X. Li, S. Yan, Y. H. Song, M. M. Farsangi
In this paper, a new robust control scheme for decentralized generator excitation control systems to improve power system stability is proposed. By using generator terminal voltage magnitude and phase angle to represent the interactions among generators, decentralized generator excitation control in multi-machine power systems can be achieved. The control is realized by applying a disturbance rejection control based on robust control design approach. Simulation results show that the proposed robust excitation control improves overall power system stability.
{"title":"Novel decentralized robust excitation control for power system stability improvement","authors":"Y. Z. Sun, X. Li, S. Yan, Y. H. Song, M. M. Farsangi","doi":"10.1109/DRPT.2000.855705","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855705","url":null,"abstract":"In this paper, a new robust control scheme for decentralized generator excitation control systems to improve power system stability is proposed. By using generator terminal voltage magnitude and phase angle to represent the interactions among generators, decentralized generator excitation control in multi-machine power systems can be achieved. The control is realized by applying a disturbance rejection control based on robust control design approach. Simulation results show that the proposed robust excitation control improves overall power system stability.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121892178","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855739
H. Ngan, K. Chow
Following proven experience on electricity de-regulation over the world, Hong Kong is poised to follow suit and prepare to have a more open electricity market. A feasible model of an open electricity market is proposed in this paper. In the paper, the basic rationale for setting up the proposed model which includes the regulating mechanism, monitoring organization, power exchange and scheme of pricing, metering and data collection, etc. is outlined.
{"title":"A feasible model of open electricity supply industry in Hong Kong","authors":"H. Ngan, K. Chow","doi":"10.1109/DRPT.2000.855739","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855739","url":null,"abstract":"Following proven experience on electricity de-regulation over the world, Hong Kong is poised to follow suit and prepare to have a more open electricity market. A feasible model of an open electricity market is proposed in this paper. In the paper, the basic rationale for setting up the proposed model which includes the regulating mechanism, monitoring organization, power exchange and scheme of pricing, metering and data collection, etc. is outlined.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127368376","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855723
K. Laitinen, J. Hovila, T. Mannila, L. Korpinen
The aim of this study was to find out the influences of different parameters on the electricity prices in the liberalized electricity market in Finland. The main emphasis was placed on climatic factors, rainfall and temperature. In this study, the spot price of electricity was compared to rainfall and temperature. The spot price is the co-Scandinavian electricity exchange Nord Pool price in Helsinki. The spot price is highly dependent on the long term rainfall. This is due to the fact that in Nordic countries a great part of electricity is produced by hydropower. The temperature seems to have very big short-term effects on the spot price. Also heavy rains in winter have short-term effects on the spot price in Finland. The rains and storms that occur in summer don't seem to have any real effect on the spot price.
{"title":"The influences of climatic factors on electricity prices in liberalized market in Finland","authors":"K. Laitinen, J. Hovila, T. Mannila, L. Korpinen","doi":"10.1109/DRPT.2000.855723","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855723","url":null,"abstract":"The aim of this study was to find out the influences of different parameters on the electricity prices in the liberalized electricity market in Finland. The main emphasis was placed on climatic factors, rainfall and temperature. In this study, the spot price of electricity was compared to rainfall and temperature. The spot price is the co-Scandinavian electricity exchange Nord Pool price in Helsinki. The spot price is highly dependent on the long term rainfall. This is due to the fact that in Nordic countries a great part of electricity is produced by hydropower. The temperature seems to have very big short-term effects on the spot price. Also heavy rains in winter have short-term effects on the spot price in Finland. The rains and storms that occur in summer don't seem to have any real effect on the spot price.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129547679","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855636
S. Matair, N. Watson, K. Wong, V. Pham, J. Arrillaga
In a deregulated electricity industry, new concerns have emerged regarding the quality of power supply as each company involved will focus on its own objectives and interest. One of the main concerns regarding the quality of power supply is the harmonic pollution. Several harmonic state estimation (HSE) techniques have been proposed for harmonic source identification. This paper presents a new HSE algorithm, which is based on singular value decomposition (SVD) method. The algorithm does not require the whole network system to be observable prior to estimation, it can give a solution even if the system under consideration is partially observable. The reduced primary AC system for the whole South Island of New Zealand, which consists of 15 main substations and more than 100 nodes is used as the test network for the validation of the new HSE algorithm. The new HSE algorithm can be used by the ISO (independent system operator) as well as distribution companies to monitor the harmonic condition and identify harmonic sources for different parts of the network.
{"title":"Harmonic state estimation: a method for remote harmonic assessment in a deregulated utility network","authors":"S. Matair, N. Watson, K. Wong, V. Pham, J. Arrillaga","doi":"10.1109/DRPT.2000.855636","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855636","url":null,"abstract":"In a deregulated electricity industry, new concerns have emerged regarding the quality of power supply as each company involved will focus on its own objectives and interest. One of the main concerns regarding the quality of power supply is the harmonic pollution. Several harmonic state estimation (HSE) techniques have been proposed for harmonic source identification. This paper presents a new HSE algorithm, which is based on singular value decomposition (SVD) method. The algorithm does not require the whole network system to be observable prior to estimation, it can give a solution even if the system under consideration is partially observable. The reduced primary AC system for the whole South Island of New Zealand, which consists of 15 main substations and more than 100 nodes is used as the test network for the validation of the new HSE algorithm. The new HSE algorithm can be used by the ISO (independent system operator) as well as distribution companies to monitor the harmonic condition and identify harmonic sources for different parts of the network.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"36 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126208289","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 : 2000-04-04DOI: 10.1109/DRPT.2000.855647
K. Bhattacharya
This paper presents a short-term generation scheduling model applicable to independent power producers participating in electricity spot-markets. The model combines unit commitment, generation scheduling and spot-market buy-sell decisions in a common profit-maximizing framework. A scheme is proposed thereafter to determine the optimum bid prices for each hour by maximizing the probability of a bid being cleared and of accruing positive returns from the market. The IEEE Reliability Test System is modified and adopted to represent an example IPP. Six distinct bidding strategies dependent on IPP's marginal cost and expected spot market price emerge from the studies.
{"title":"Strategic bidding and generation scheduling in electricity spot-markets","authors":"K. Bhattacharya","doi":"10.1109/DRPT.2000.855647","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855647","url":null,"abstract":"This paper presents a short-term generation scheduling model applicable to independent power producers participating in electricity spot-markets. The model combines unit commitment, generation scheduling and spot-market buy-sell decisions in a common profit-maximizing framework. A scheme is proposed thereafter to determine the optimum bid prices for each hour by maximizing the probability of a bid being cleared and of accruing positive returns from the market. The IEEE Reliability Test System is modified and adopted to represent an example IPP. Six distinct bidding strategies dependent on IPP's marginal cost and expected spot market price emerge from the studies.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125612171","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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