Pub Date : 2000-04-04DOI: 10.1109/DRPT.2000.855707
K. L. Lo, L. Khan
This paper presents an application of fuzzy control to determine the control signal of static VAr compensator (SVC) for improvement of power system stability. This compensation scheme relevant to flexible AC transmission systems (FACTS) technology is used worldwide to improve system dynamic performance. The device increases power transfer and improves the damping of electromechanical oscillations when used in transmission systems. The proposed controller for the SVC is based on fuzzy set theory and is called fuzzy logic controller (FLC). Input signals for the FLC are chosen as generator speed deviation and accelerated power. The quantity of reactive power supplied/absorbed by SVC is determined based on the two input signals at each sampling time. The control signal is calculated using fuzzy membership functions. The effectiveness and feasibility of the proposed control method is demonstrated by a one machine infinite bus system.
{"title":"Fuzzy logic based SVC for power system transient stability enhancement","authors":"K. L. Lo, L. Khan","doi":"10.1109/DRPT.2000.855707","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855707","url":null,"abstract":"This paper presents an application of fuzzy control to determine the control signal of static VAr compensator (SVC) for improvement of power system stability. This compensation scheme relevant to flexible AC transmission systems (FACTS) technology is used worldwide to improve system dynamic performance. The device increases power transfer and improves the damping of electromechanical oscillations when used in transmission systems. The proposed controller for the SVC is based on fuzzy set theory and is called fuzzy logic controller (FLC). Input signals for the FLC are chosen as generator speed deviation and accelerated power. The quantity of reactive power supplied/absorbed by SVC is determined based on the two input signals at each sampling time. The control signal is calculated using fuzzy membership functions. The effectiveness and feasibility of the proposed control method is demonstrated by a one machine infinite bus system.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"16 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":"126161397","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.2000.855744
W.K.A. Goncalves, J. de Oliveira, V. Franco
The benefits of using advanced static compensator are well established However, when they are implemented in any power system side effects may be found. This is the case of harmonic injection produced by both the parallel and series units. In this way, this paper contributes towards the investigation of the relationship between supply conditions and harmonic generation by the well known STATCOM compensator. To achieve this, using space vector control and instantaneous power theory, a model of a parallel advanced static VAr compensator (ASVC) is developed and implemented into a time domain SABER simulator. Then, a typical arrangement consisting of a commercial type of shunt compensator connected to an ideal and nonideal supply is simulated in relation to the overall system/compensator dynamic behaviour and harmonic generation.
{"title":"Harmonics produced by advanced static VAr compensator under electric power supply conditions with loss of quality","authors":"W.K.A. Goncalves, J. de Oliveira, V. Franco","doi":"10.1109/DRPT.2000.855744","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855744","url":null,"abstract":"The benefits of using advanced static compensator are well established However, when they are implemented in any power system side effects may be found. This is the case of harmonic injection produced by both the parallel and series units. In this way, this paper contributes towards the investigation of the relationship between supply conditions and harmonic generation by the well known STATCOM compensator. To achieve this, using space vector control and instantaneous power theory, a model of a parallel advanced static VAr compensator (ASVC) is developed and implemented into a time domain SABER simulator. Then, a typical arrangement consisting of a commercial type of shunt compensator connected to an ideal and nonideal supply is simulated in relation to the overall system/compensator dynamic behaviour and harmonic generation.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"141 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":"126635058","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.2000.855684
D. Nguyen, K. Wong
This paper develops a metric for determining the stability of power markets. The metric developed is valid for any differentiable generation cost curves and consumer utility functions. The results of extending of the metric to reflect the effects of the transmission network are also given. The formulation does not consider the time dynamics of the market. However the predictions of the metric were shown to be consistent with those derived from consideration of the markets time dynamics. Application of the metric to power market indicates that the stability of the market is in general a function of both market parameters, as well as its equilibrium states. That is in general power market stability is dependent on individual participants market-share and not just the functional forms of their cost or utility curves.
{"title":"A general stability metric for competitive power markets","authors":"D. Nguyen, K. Wong","doi":"10.1109/DRPT.2000.855684","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855684","url":null,"abstract":"This paper develops a metric for determining the stability of power markets. The metric developed is valid for any differentiable generation cost curves and consumer utility functions. The results of extending of the metric to reflect the effects of the transmission network are also given. The formulation does not consider the time dynamics of the market. However the predictions of the metric were shown to be consistent with those derived from consideration of the markets time dynamics. Application of the metric to power market indicates that the stability of the market is in general a function of both market parameters, as well as its equilibrium states. That is in general power market stability is dependent on individual participants market-share and not just the functional forms of their cost or utility curves.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"431 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":"122873594","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.2000.855662
T. Venegas, C. Fuerte-Esquivel
The goal of this paper is to develop a steady-state mathematical model of the new generation of power electronic-based plant components emerging as a result of the newly developed concept of flexible AC transmission systems (FACTS), namely thyristor controlled series compensator (TCSC). The modelling is carried out in the phase domain considering the TCSC physical structure. A polyphase power flow program based on Newton algorithm is developed in order to implement the proposed model. Analysis of the TCSC performance is carried out in both balanced and unbalanced power network operating conditions. This kind of analysis will allow quantifying the many economical and technical benefits this technology promises, as well as examining the applicability and functional specifications of the controller.
{"title":"Steady-state modelling of thyristor controlled series compensator for phase domain load flow analysis of electric networks","authors":"T. Venegas, C. Fuerte-Esquivel","doi":"10.1109/DRPT.2000.855662","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855662","url":null,"abstract":"The goal of this paper is to develop a steady-state mathematical model of the new generation of power electronic-based plant components emerging as a result of the newly developed concept of flexible AC transmission systems (FACTS), namely thyristor controlled series compensator (TCSC). The modelling is carried out in the phase domain considering the TCSC physical structure. A polyphase power flow program based on Newton algorithm is developed in order to implement the proposed model. Analysis of the TCSC performance is carried out in both balanced and unbalanced power network operating conditions. This kind of analysis will allow quantifying the many economical and technical benefits this technology promises, as well as examining the applicability and functional specifications of the controller.","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":"130322509","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.2000.855735
T. Ackermann, G. Andersson, L. Söder
Distributed generation (DG) has attracted a lot of attention recently and might become more important in future power generation systems. As different definitions are used worldwide, the paper briefly discusses the definition of DG. The future development of DG, however, will, to a not insignificant part, depend on the legal framework. As the legal framework can vary significantly for different competitive electricity markets, this paper briefly identifies and analyses some variations in the regulatory approaches, e.g. for power exchanges, balance services and ancillary services, in different countries. It also illustrates the influence of market regulations on the development of distributed power generation. Based on this analysis, it can be concluded that regulatory aspects might decisively influence the development of distributed power generation.
{"title":"Electricity market regulations and their impact on distributed generation","authors":"T. Ackermann, G. Andersson, L. Söder","doi":"10.1109/DRPT.2000.855735","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855735","url":null,"abstract":"Distributed generation (DG) has attracted a lot of attention recently and might become more important in future power generation systems. As different definitions are used worldwide, the paper briefly discusses the definition of DG. The future development of DG, however, will, to a not insignificant part, depend on the legal framework. As the legal framework can vary significantly for different competitive electricity markets, this paper briefly identifies and analyses some variations in the regulatory approaches, e.g. for power exchanges, balance services and ancillary services, in different countries. It also illustrates the influence of market regulations on the development of distributed power generation. Based on this analysis, it can be concluded that regulatory aspects might decisively influence the development of distributed power generation.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"35 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":"126891771","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.2000.855741
S. Srivastava, R. Verma
Transmission pricing has been an important issue in the ongoing debate about power system restructuring and deregulation. The purpose of pricing is to recover cost of transmission, and encourage efficient use and investment. This paper utilizes location based pricing concepts and has suggested a nonlinear programming problem formulation to determine real and reactive power prices, with an objective to maximize the net social welfare within the system constraints. The paper also demonstrates the ability of FACTS devices to reduce the overall operating cost and their impact on transmission pricing. Two types of FACTS devices have been considered viz. static VAr compensator (SVC) and thyristor controlled series compensator (TCSC). The concepts introduced in the paper have been investigated on a modified IEEE 14-bus system.
{"title":"Impact of FACTS devices on transmission pricing in a de-regulated electricity market","authors":"S. Srivastava, R. Verma","doi":"10.1109/DRPT.2000.855741","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855741","url":null,"abstract":"Transmission pricing has been an important issue in the ongoing debate about power system restructuring and deregulation. The purpose of pricing is to recover cost of transmission, and encourage efficient use and investment. This paper utilizes location based pricing concepts and has suggested a nonlinear programming problem formulation to determine real and reactive power prices, with an objective to maximize the net social welfare within the system constraints. The paper also demonstrates the ability of FACTS devices to reduce the overall operating cost and their impact on transmission pricing. Two types of FACTS devices have been considered viz. static VAr compensator (SVC) and thyristor controlled series compensator (TCSC). The concepts introduced in the paper have been investigated on a modified IEEE 14-bus system.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"19 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":"126897106","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.2000.855671
S. Skok, A. Marusic
This paper elaborates settings and modification of the operating characteristic of adaptive distance relays which protect a transmission line between two terminals. Operating characteristic should have such shape to satisfy all conditions in the power system. However it is known that there is no combination of characteristics which can satisfy all possible conditions. So the only solution is modification of the operating characteristic. Solution of this problem involves two types of neural networks, multilayered perceptron and the self-organizing neural network, the so called Kohonen network. Here the authors consider a two-terminal transmission line, confirm that fault resistance and location of faults can produce erroneous relay function and finally suggest ways to ensure the generation of the correct signal for relay operation. With the simple simulation, the authors present the advantages of the particular models and the credibility of the developed models.
{"title":"Comparison of various neural network models applied to adaptive distance protection","authors":"S. Skok, A. Marusic","doi":"10.1109/DRPT.2000.855671","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855671","url":null,"abstract":"This paper elaborates settings and modification of the operating characteristic of adaptive distance relays which protect a transmission line between two terminals. Operating characteristic should have such shape to satisfy all conditions in the power system. However it is known that there is no combination of characteristics which can satisfy all possible conditions. So the only solution is modification of the operating characteristic. Solution of this problem involves two types of neural networks, multilayered perceptron and the self-organizing neural network, the so called Kohonen network. Here the authors consider a two-terminal transmission line, confirm that fault resistance and location of faults can produce erroneous relay function and finally suggest ways to ensure the generation of the correct signal for relay operation. With the simple simulation, the authors present the advantages of the particular models and the credibility of the developed models.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"10 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":"129115999","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.2000.855635
P. Stephenson, M. Paun
The UK electricity market is maturing with the extension of competition in electricity supply to all consumers being completed last year. A diversity of customer services are provided by the electricity suppliers and can include information services for example half-hourly load data. In the UK competitive market, consumers with half hourly metering, or with the ability to measure their electrical load profiles, have new possibilities of controlling costs as a result of the more detailed consumption data available to them. Load management and cost control opportunities that can benefit both supplier and consumer include incorporating the data into computer aided production management (CAPM) systems refining production scheduling, or implementing management strategies utilising the load and cost data. The paper includes case studies demonstrating consumer cost savings.
{"title":"Consumer advantages from half-hourly metering and load profiles in the UK competitive electricity market","authors":"P. Stephenson, M. Paun","doi":"10.1109/DRPT.2000.855635","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855635","url":null,"abstract":"The UK electricity market is maturing with the extension of competition in electricity supply to all consumers being completed last year. A diversity of customer services are provided by the electricity suppliers and can include information services for example half-hourly load data. In the UK competitive market, consumers with half hourly metering, or with the ability to measure their electrical load profiles, have new possibilities of controlling costs as a result of the more detailed consumption data available to them. Load management and cost control opportunities that can benefit both supplier and consumer include incorporating the data into computer aided production management (CAPM) systems refining production scheduling, or implementing management strategies utilising the load and cost data. The paper includes case studies demonstrating consumer cost savings.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"42 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":"121436083","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.2000.855701
G. Diana, P. Govender
This paper describes an energy management system currently being implemented on the University of Natal campus, South Africa. Due to the similarity of its load profile to those of commercial institutions, the campus forms a valuable test case to evaluate the effectiveness of demand side management strategies required to maintain pace with both the current and future changes in the South African electricity supply industry. This paper presents an innovative demand side management strategy for small to medium electricity consumers.
{"title":"Demand side management: a case study of a tertiary institution","authors":"G. Diana, P. Govender","doi":"10.1109/DRPT.2000.855701","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855701","url":null,"abstract":"This paper describes an energy management system currently being implemented on the University of Natal campus, South Africa. Due to the similarity of its load profile to those of commercial institutions, the campus forms a valuable test case to evaluate the effectiveness of demand side management strategies required to maintain pace with both the current and future changes in the South African electricity supply industry. This paper presents an innovative demand side management strategy for small to medium electricity consumers.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"105 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":"132044942","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.2000.855654
K. Matsumoto, Y. Takamuki, N. Mori, M. Kitayama
Computational markets have been suggested as a solution to resource allocation, scheduling, and optimization problems. This paper describes how computational markets can be used to handle the application of demand side management. Demand side management enables electric power companies to reduce peak loads and thereby save money. A load is any device that consumes electric energy in this situation. Due to the large number of different loads, demand side management is a complicated optimization problem. The authors present a new interactive approach to this problem by using utility functions of electric power marketers. This approach provides an online estimation of the functions. In addition to them, it can deal with time-variable tendency of customers.
{"title":"An interactive approach to demand side management based on utility functions","authors":"K. Matsumoto, Y. Takamuki, N. Mori, M. Kitayama","doi":"10.1109/DRPT.2000.855654","DOIUrl":"https://doi.org/10.1109/DRPT.2000.855654","url":null,"abstract":"Computational markets have been suggested as a solution to resource allocation, scheduling, and optimization problems. This paper describes how computational markets can be used to handle the application of demand side management. Demand side management enables electric power companies to reduce peak loads and thereby save money. A load is any device that consumes electric energy in this situation. Due to the large number of different loads, demand side management is a complicated optimization problem. The authors present a new interactive approach to this problem by using utility functions of electric power marketers. This approach provides an online estimation of the functions. In addition to them, it can deal with time-variable tendency of customers.","PeriodicalId":127287,"journal":{"name":"DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382)","volume":"34 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":"130195146","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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