The main purpose of this paper is to investigate the power flow regulating capabilities of an UPFC's injection model by using all three UPFC's control parameters simultaneously. The control system of the model is developed and its contributions to power flow regulation are explored on a multi-machine test system. The analysis is carried out from dynamic aspect utilising time-domain simulations. With the UPFC being embedded in the system, the analysis is concentrated on a transmission system compensation issues. It is shown that the model can fulfil functions of reactive shunt compensation, series compensation and phase shifting meeting multiple control objectives by applying boosting transformer injected voltage and exciting transformer reactive current.
{"title":"Power flow regulation by use of UPFC's injection model","authors":"N. Dizdarević, S. Tesnjak, G. Andersson","doi":"10.1109/PTC.1999.826538","DOIUrl":"https://doi.org/10.1109/PTC.1999.826538","url":null,"abstract":"The main purpose of this paper is to investigate the power flow regulating capabilities of an UPFC's injection model by using all three UPFC's control parameters simultaneously. The control system of the model is developed and its contributions to power flow regulation are explored on a multi-machine test system. The analysis is carried out from dynamic aspect utilising time-domain simulations. With the UPFC being embedded in the system, the analysis is concentrated on a transmission system compensation issues. It is shown that the model can fulfil functions of reactive shunt compensation, series compensation and phase shifting meeting multiple control objectives by applying boosting transformer injected voltage and exciting transformer reactive current.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129161284","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}
The purpose of this paper is the investigation of the harmonic distortion introduced by the compact fluorescent lamps to the distribution systems. The results of some measurements on compact fluorescent lamps (CFL) and on self-ballasted fluorescent lamps (SBL) of various wattages are presented. Some of the most important electrical characteristics (voltage, current and power factor) were measured by a data acquisition system. The harmonic spectrum and the total harmonic distortion (THD) of the lamps were calculated using Fourier analysis of the recorded current waveforms. The measurements were performed with supply voltage other than the nominal one in order to determine the dependence of the THD variation upon the mains supply voltage. From these measurements, conclusions concerning the problem of harmonics are drawn.
{"title":"Harmonic distortion in electric power systems introduced by compact fluorescent lamps","authors":"I. Gonos, M. Kostic, F.V. Topalis","doi":"10.1109/PTC.1999.826727","DOIUrl":"https://doi.org/10.1109/PTC.1999.826727","url":null,"abstract":"The purpose of this paper is the investigation of the harmonic distortion introduced by the compact fluorescent lamps to the distribution systems. The results of some measurements on compact fluorescent lamps (CFL) and on self-ballasted fluorescent lamps (SBL) of various wattages are presented. Some of the most important electrical characteristics (voltage, current and power factor) were measured by a data acquisition system. The harmonic spectrum and the total harmonic distortion (THD) of the lamps were calculated using Fourier analysis of the recorded current waveforms. The measurements were performed with supply voltage other than the nominal one in order to determine the dependence of the THD variation upon the mains supply voltage. From these measurements, conclusions concerning the problem of harmonics are drawn.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116625791","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}
The paper presents a new technique for the economic dispatch of isolated power systems with a high penetration of renewable forms of energy. It also describes a software module based on this technique integrated on a real-time control system.
{"title":"Economic dispatch in isolated networks with renewables using evolutionary programming","authors":"L. M. Proença, J. L. Pinto, M. Matos","doi":"10.1109/PTC.1999.826471","DOIUrl":"https://doi.org/10.1109/PTC.1999.826471","url":null,"abstract":"The paper presents a new technique for the economic dispatch of isolated power systems with a high penetration of renewable forms of energy. It also describes a software module based on this technique integrated on a real-time control system.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"18 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116694153","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}
For AC networks with large amounts of induction generators-in case of e.g. windmills-the paper demonstrates a significant discrepancy in the simulated voltage recovery after faults in weak networks, when comparing result obtained with dynamic stability programs and transient programs, respectively with and without a model of the mechanical shaft. The reason for the discrepancies are explained, and it is shown that the phenomenon is due partly to the presence of DC offset currents in the induction machine stator, and partly to the mechanical shaft system of the wind turbine and the generator rotor. It is shown that it is possible to include a transient model in dynamic stability programs and thus obtain correct results also in dynamic stability programs. A mechanical model of the shaft system has also been included in the generator model.
{"title":"Modelling of windmill induction generators in dynamic simulation programs","authors":"Vladislav Knudsen Akhmatov, Hans","doi":"10.1109/PTC.1999.826539","DOIUrl":"https://doi.org/10.1109/PTC.1999.826539","url":null,"abstract":"For AC networks with large amounts of induction generators-in case of e.g. windmills-the paper demonstrates a significant discrepancy in the simulated voltage recovery after faults in weak networks, when comparing result obtained with dynamic stability programs and transient programs, respectively with and without a model of the mechanical shaft. The reason for the discrepancies are explained, and it is shown that the phenomenon is due partly to the presence of DC offset currents in the induction machine stator, and partly to the mechanical shaft system of the wind turbine and the generator rotor. It is shown that it is possible to include a transient model in dynamic stability programs and thus obtain correct results also in dynamic stability programs. A mechanical model of the shaft system has also been included in the generator model.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"46 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131436182","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}
This paper presents a self-organizing map (SOM) based method for power system load-loss state classification. This classifier maps vectors of an N-dimensional space to a 2-dimensional net in a nonlinear way while preserving the topological order of the input vectors. Input features to SOM are real and reactive power at each load bus and available real power generation at each generation bus. After the training of the SOM, the generalization capability of the SOM can cope with various operating conditions which have not been encountered during the training phase and hence give a correct classification result. The effectiveness of the proposed method has been demonstrated on a 9-bus test system. This proposed method is useful for power system operation, power system reliability assessment and state screening.
{"title":"Using self-organizing map in identification of load-loss state","authors":"X. Luo, C. Singh, A. Patton","doi":"10.1109/PTC.1999.826563","DOIUrl":"https://doi.org/10.1109/PTC.1999.826563","url":null,"abstract":"This paper presents a self-organizing map (SOM) based method for power system load-loss state classification. This classifier maps vectors of an N-dimensional space to a 2-dimensional net in a nonlinear way while preserving the topological order of the input vectors. Input features to SOM are real and reactive power at each load bus and available real power generation at each generation bus. After the training of the SOM, the generalization capability of the SOM can cope with various operating conditions which have not been encountered during the training phase and hence give a correct classification result. The effectiveness of the proposed method has been demonstrated on a 9-bus test system. This proposed method is useful for power system operation, power system reliability assessment and state screening.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132585653","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}
In the report some results of research of electric power quality (EPQ) in power system networks of Ukraine are considered. The approach to realization of measurements of electric power quality indices (EPQI) values as random variables, and evaluation of results of measurement are considered. Because of the analysis of a state of EPQ in power networks of some power system substations, a number of practical conclusions are made. They are expedient for use in realization of measurement with the purpose of work reduction and increase of measurement efficiencies.
{"title":"Measurement and analysis of electric power quality in power system networks","authors":"A. Lipsky","doi":"10.1109/PTC.1999.826652","DOIUrl":"https://doi.org/10.1109/PTC.1999.826652","url":null,"abstract":"In the report some results of research of electric power quality (EPQ) in power system networks of Ukraine are considered. The approach to realization of measurements of electric power quality indices (EPQI) values as random variables, and evaluation of results of measurement are considered. Because of the analysis of a state of EPQ in power networks of some power system substations, a number of practical conclusions are made. They are expedient for use in realization of measurement with the purpose of work reduction and increase of measurement efficiencies.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131757062","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}
This paper describes steady state and dynamic induction motor reduced order models improvement for the simulation of the dynamic performance of power systems. The steady state model is suited for power flow programs and is one solution to the problem of initializing the dynamic models of the induction motor. Dynamic models are in a reference frame that takes into account the transient frequency changes of the system and represent the damping effects of these devices correctly.
{"title":"Improvement of induction motors models for power system transient stability studies","authors":"D. Ruiz, T. Asiain, D. Olguin","doi":"10.1109/PTC.1999.826501","DOIUrl":"https://doi.org/10.1109/PTC.1999.826501","url":null,"abstract":"This paper describes steady state and dynamic induction motor reduced order models improvement for the simulation of the dynamic performance of power systems. The steady state model is suited for power flow programs and is one solution to the problem of initializing the dynamic models of the induction motor. Dynamic models are in a reference frame that takes into account the transient frequency changes of the system and represent the damping effects of these devices correctly.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122703638","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}
Deregulation is causing a great impact on the electric power industry around the world. Many transactions in electric power markets are based on bidding competition after deregulation. The nodal price plays an important role in such a kind of market to reflect the bidding strategy for a market participant. This paper investigates the impact of ancillary service, security constraint, and MW loss on nodal prices in the system. The causes for the variation of nodal prices are explained. The problem is formulated with DC models and solved by simplex linear programming. The simulation results help understand the meaning of the nodal prices and help develop bidding strategies for the market participants.
{"title":"Investigation of nodal prices in a deregulated competitive market-case studies","authors":"Yingyi Hong, M. Weng","doi":"10.1109/PTC.1999.826592","DOIUrl":"https://doi.org/10.1109/PTC.1999.826592","url":null,"abstract":"Deregulation is causing a great impact on the electric power industry around the world. Many transactions in electric power markets are based on bidding competition after deregulation. The nodal price plays an important role in such a kind of market to reflect the bidding strategy for a market participant. This paper investigates the impact of ancillary service, security constraint, and MW loss on nodal prices in the system. The causes for the variation of nodal prices are explained. The problem is formulated with DC models and solved by simplex linear programming. The simulation results help understand the meaning of the nodal prices and help develop bidding strategies for the market participants.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124086301","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}
In recent years, there has been an increasing interest for the analysis of dynamic voltage stability on power systems. It is well known that induction motor loads have a particularly hazardous role in the voltage stability. On the other hand, in transmission systems loaded by induction motor loads, configuration changes such as line tripping, may cause voltage collapse. Moreover, if there is a fault on transmission lines, the disturbance effect will then significantly increase the possibility of voltage collapse. In this study, a transmission system subjected to different faults on different locations is examined from the viewpoint of voltage stability. The study shows that in the certain cases of paralleled transmission lines, single or double phase tripping of a faulted line will have positive effects on voltage stability, instead of all three phase tripping.
{"title":"Effects of transmission line faults on dynamic voltage stability","authors":"M. Yalçin, M. Turan, Z. Demir","doi":"10.1109/PTC.1999.826511","DOIUrl":"https://doi.org/10.1109/PTC.1999.826511","url":null,"abstract":"In recent years, there has been an increasing interest for the analysis of dynamic voltage stability on power systems. It is well known that induction motor loads have a particularly hazardous role in the voltage stability. On the other hand, in transmission systems loaded by induction motor loads, configuration changes such as line tripping, may cause voltage collapse. Moreover, if there is a fault on transmission lines, the disturbance effect will then significantly increase the possibility of voltage collapse. In this study, a transmission system subjected to different faults on different locations is examined from the viewpoint of voltage stability. The study shows that in the certain cases of paralleled transmission lines, single or double phase tripping of a faulted line will have positive effects on voltage stability, instead of all three phase tripping.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128995486","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}
In this paper, a modification to the optimal power flow problem, which accounts for the presence of wind parks and independent power producers (IPP) operation under large-scale integration of dispatchable wind energy resource in the power system, is described. A successive linear programming approach is utilized for the solution of the problem.
{"title":"Consideration of wind parks operation in the optimal power flow problem","authors":"G. Contaxis, Andreas Vlachos","doi":"10.1109/PTC.1999.826494","DOIUrl":"https://doi.org/10.1109/PTC.1999.826494","url":null,"abstract":"In this paper, a modification to the optimal power flow problem, which accounts for the presence of wind parks and independent power producers (IPP) operation under large-scale integration of dispatchable wind energy resource in the power system, is described. A successive linear programming approach is utilized for the solution of the problem.","PeriodicalId":101688,"journal":{"name":"PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128532419","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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