Pub Date : 2009-05-20DOI: 10.1109/CPE.2009.5156077
R. Fotouhi, S. Farshad, S. S. Fazel
The problem of stray current in DC railways has not been solved completely in spite of many years of research and investigation, specially where there is not good rail insulation to prevent corrosion risk to the infrastructure. A new novel booster circuit which reduces stray current and rail potential is proposed in this paper for DC railways. Design considerations are discussed and simulation results of a 750 V-DC MRT system with and without the proposed booster circuit are compared.
{"title":"A new novel DC booster circuit to reduce stray current and rail potential in DC railways","authors":"R. Fotouhi, S. Farshad, S. S. Fazel","doi":"10.1109/CPE.2009.5156077","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156077","url":null,"abstract":"The problem of stray current in DC railways has not been solved completely in spite of many years of research and investigation, specially where there is not good rail insulation to prevent corrosion risk to the infrastructure. A new novel booster circuit which reduces stray current and rail potential is proposed in this paper for DC railways. Design considerations are discussed and simulation results of a 750 V-DC MRT system with and without the proposed booster circuit are compared.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121785348","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156074
T. Jalakas, D. Vinnikov, T. Lehtla, V. Bolgov
In DC/DC power converters, as in many other applications with inverter circuits, the interlock delay time between IGBT switching on and off in the opposite inverter arms is used to avoid a short circuit in a DC link. It is suggested by several handbooks that 20% of the half period should be used. However, in some applications, e.g. power supplies with extended input voltage variations, much smaller interlock delay time must be used to ensure correct operation of the inverter. In this paper the interlock delay time minimization possibility is analyzed on an example of an existing experimental device based on 6.5 kV IGBTs. Moreover, the possible impact of interlock delay time minimization on the isolated DC/DC converter components, operability and efficiency is evaluated.
{"title":"Interlock delay time minimization and its impact on the high-voltage half-bridge DC/DC converter","authors":"T. Jalakas, D. Vinnikov, T. Lehtla, V. Bolgov","doi":"10.1109/CPE.2009.5156074","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156074","url":null,"abstract":"In DC/DC power converters, as in many other applications with inverter circuits, the interlock delay time between IGBT switching on and off in the opposite inverter arms is used to avoid a short circuit in a DC link. It is suggested by several handbooks that 20% of the half period should be used. However, in some applications, e.g. power supplies with extended input voltage variations, much smaller interlock delay time must be used to ensure correct operation of the inverter. In this paper the interlock delay time minimization possibility is analyzed on an example of an existing experimental device based on 6.5 kV IGBTs. Moreover, the possible impact of interlock delay time minimization on the isolated DC/DC converter components, operability and efficiency is evaluated.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128255808","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156035
H. Mohammadpour, M. Pahlavani, A. Shoulaie
The subsynchronous resonance (SSR) phenomenon may occur when a steam turbine-generator is connected to a long transmission line with series compensation. In this paper, to mitigate SSR, two control methodologies for turn-off angle control of the gate-controlled series capacitor (GCSC) are presented. The first methodology is an open-loop control that uses the line current frequency oscillations to generate proper turn-ff angle for the GCSC. The second one is a closed loop control that is based on the Takagi-Sugeno (TS) fuzzy logic controller. The study system was modified from the IEEE First Benchmark Model by changing a part of the fixed series capacitor to the GCSC. The MATLAB® program was used to verify the effectiveness of each control methodology. Three different GCSC ratings were analyzed. It is shown that using an open-loop control methodology, in some GCSC ratings, the SSR can be properly damped. It is also shown that using TS fuzzy control methodology, not only SSR but also electromechanical power oscillation can be effectively damped.
{"title":"On control of gate controlled series capacitor for SSR and power oscillation damping","authors":"H. Mohammadpour, M. Pahlavani, A. Shoulaie","doi":"10.1109/CPE.2009.5156035","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156035","url":null,"abstract":"The subsynchronous resonance (SSR) phenomenon may occur when a steam turbine-generator is connected to a long transmission line with series compensation. In this paper, to mitigate SSR, two control methodologies for turn-off angle control of the gate-controlled series capacitor (GCSC) are presented. The first methodology is an open-loop control that uses the line current frequency oscillations to generate proper turn-ff angle for the GCSC. The second one is a closed loop control that is based on the Takagi-Sugeno (TS) fuzzy logic controller. The study system was modified from the IEEE First Benchmark Model by changing a part of the fixed series capacitor to the GCSC. The MATLAB® program was used to verify the effectiveness of each control methodology. Three different GCSC ratings were analyzed. It is shown that using an open-loop control methodology, in some GCSC ratings, the SSR can be properly damped. It is also shown that using TS fuzzy control methodology, not only SSR but also electromechanical power oscillation can be effectively damped.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122330580","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156011
P. Fernandez-Comesana, J. Doval‐Gandoy, E. Díaz-Dorado, D. Alvira-Baeza
The actual lines have many operation problems like oscillations, a important reactive power flow in the lines… other kind of problems are the planification of the network (power of the generators, reactive power flow in the lines…) or the bad distribution of the power flow in the lines of the network, for example one line overloaded and the other lines below their nominal power, this case happens, for example, in a network when a line falls. Many techniques have been used to solve this second type of problems, actually techniques based in the evolution and natural selection (like genetic algorithms or evolutionary algorithms) are being used combined with electronic equipment. The FACTS are a good electronic equipment to be used in these problems, because the converter can stay in bypass until a line falls, in this moment the converter can be used to solve the problem. The line impedance can be changed using SSSC converters, because they can inject a voltage in quadrature with the line current, so the effect of the converter is a capacitive or a inductive reactance in series with the line impedance. This paper presents an evolutive algorithm that solves the problem of placing SSSC converters in a network to optimize the power flow across all the lines of those network, minimizing the total installed power. The number of converters to be placed and their power will be chosen by the algorithm too.
{"title":"Evolutive algorithm to optimize the power flow in a network using series compensators","authors":"P. Fernandez-Comesana, J. Doval‐Gandoy, E. Díaz-Dorado, D. Alvira-Baeza","doi":"10.1109/CPE.2009.5156011","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156011","url":null,"abstract":"The actual lines have many operation problems like oscillations, a important reactive power flow in the lines… other kind of problems are the planification of the network (power of the generators, reactive power flow in the lines…) or the bad distribution of the power flow in the lines of the network, for example one line overloaded and the other lines below their nominal power, this case happens, for example, in a network when a line falls. Many techniques have been used to solve this second type of problems, actually techniques based in the evolution and natural selection (like genetic algorithms or evolutionary algorithms) are being used combined with electronic equipment. The FACTS are a good electronic equipment to be used in these problems, because the converter can stay in bypass until a line falls, in this moment the converter can be used to solve the problem. The line impedance can be changed using SSSC converters, because they can inject a voltage in quadrature with the line current, so the effect of the converter is a capacitive or a inductive reactance in series with the line impedance. This paper presents an evolutive algorithm that solves the problem of placing SSSC converters in a network to optimize the power flow across all the lines of those network, minimizing the total installed power. The number of converters to be placed and their power will be chosen by the algorithm too.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122710385","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156006
A. Moreno-Muñoz, J. Flores-Arias, V. Pallarés, J. D. L. de la Rosa
Voltage sag analysis is a complex stochastic issue, since it involves a large variety of random factors, such as: type of short-circuits in the power system, location of faults, protective system performance and atmospheric discharges. Among all categories of electrical disturbances, the voltage sag (dip) and momentary interruption are the nemeses of the automated industrial process. This paper presents results from two power quality audit conducted in different highly automated factories. In both cases it was found that the main problems for the equipment installed were voltage sags. The paper analyzes the capabilities of modern power supplies; the convenience of “embedded solution” is also discussed. Finally it is addressed the role of the Standards on the protection of electronic equipment.
{"title":"Power quality immunity in factory automation","authors":"A. Moreno-Muñoz, J. Flores-Arias, V. Pallarés, J. D. L. de la Rosa","doi":"10.1109/CPE.2009.5156006","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156006","url":null,"abstract":"Voltage sag analysis is a complex stochastic issue, since it involves a large variety of random factors, such as: type of short-circuits in the power system, location of faults, protective system performance and atmospheric discharges. Among all categories of electrical disturbances, the voltage sag (dip) and momentary interruption are the nemeses of the automated industrial process. This paper presents results from two power quality audit conducted in different highly automated factories. In both cases it was found that the main problems for the equipment installed were voltage sags. The paper analyzes the capabilities of modern power supplies; the convenience of “embedded solution” is also discussed. Finally it is addressed the role of the Standards on the protection of electronic equipment.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114612131","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156005
A. Aguera, J. Ramiro, J. D. L. de la Rosa, J. Melgar, J.C. Palomares, A. Moreno
In this paper a geostatistic wind direction model is applied to trace a wind speed map, based on data from official measurement weather stations distributed within the region of Andalucia-Spain. Each station's performance is assessed by comparing real measurements to those resulting from the linear interpolation of the rest. Once an error is associated to the station, the error is drawn in a map, in which minimum error zones can be delimited. Frequency and wind speed in each direction are the magnitudes of interest to get a first categorization of wind resources associated to the region. The interest of the method relies in the possibility of forecasting everywhere within the region with an error inside the tolerable margins.
{"title":"Categorization of minimum error forecasting zones using a geostatistic wind model","authors":"A. Aguera, J. Ramiro, J. D. L. de la Rosa, J. Melgar, J.C. Palomares, A. Moreno","doi":"10.1109/CPE.2009.5156005","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156005","url":null,"abstract":"In this paper a geostatistic wind direction model is applied to trace a wind speed map, based on data from official measurement weather stations distributed within the region of Andalucia-Spain. Each station's performance is assessed by comparing real measurements to those resulting from the linear interpolation of the rest. Once an error is associated to the station, the error is drawn in a map, in which minimum error zones can be delimited. Frequency and wind speed in each direction are the magnitudes of interest to get a first categorization of wind resources associated to the region. The interest of the method relies in the possibility of forecasting everywhere within the region with an error inside the tolerable margins.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126413442","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156079
V. Zhuikov, Iuliia Petergeria, Y. Khokhlov, T. Khyzhnyak
This paper addresses the application of spectral discrete transforms of functions with m-ary argument for the interference-free transmission of control signals for semiconductor converters through power lines and for diagnostics of converters.
本文讨论了带m参数函数的频谱离散变换在半导体变换器控制信号经电力线无干扰传输和变换器诊断中的应用。
{"title":"Use of discrete transfroms with m-ary argument for remote control and diagnostics of semiconductor converters","authors":"V. Zhuikov, Iuliia Petergeria, Y. Khokhlov, T. Khyzhnyak","doi":"10.1109/CPE.2009.5156079","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156079","url":null,"abstract":"This paper addresses the application of spectral discrete transforms of functions with m-ary argument for the interference-free transmission of control signals for semiconductor converters through power lines and for diagnostics of converters.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121738993","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156016
M. Lamich, J. Balcells, D. González, X. Gago, C. Jaen, J. L. Castillo
The main drawback of Shunt Hybrid Filters is the need of leading current injection. This paper describes a strategy to reduce the leading current in a three phase four wires LC coupled parallel hybrid filter for harmonics cancellation. Simulation and experimental results are given to show the behavior of the system.
{"title":"Control to reduce leading current in a Shunt Hybrid power filter","authors":"M. Lamich, J. Balcells, D. González, X. Gago, C. Jaen, J. L. Castillo","doi":"10.1109/CPE.2009.5156016","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156016","url":null,"abstract":"The main drawback of Shunt Hybrid Filters is the need of leading current injection. This paper describes a strategy to reduce the leading current in a three phase four wires LC coupled parallel hybrid filter for harmonics cancellation. Simulation and experimental results are given to show the behavior of the system.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124748742","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156028
L. Asiminoaei, S. Kalaschnikow, S. Hansen
This paper describes two harmonic detection methods used in industrial shunt Active Filters. The methods are overall harmonic compensation and selective harmonic compensation. Both methods are described and analyzed in the paper together with several practical design steps for Adjustable Speed Drives applications. The methods are compared in the case of voltage unbalance and predistortion, common cases in industrial applications. The paper concludes with guidelines of using each method in different cases.
{"title":"Overall and selective compensation of harmonic currents in Active Filter applications","authors":"L. Asiminoaei, S. Kalaschnikow, S. Hansen","doi":"10.1109/CPE.2009.5156028","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156028","url":null,"abstract":"This paper describes two harmonic detection methods used in industrial shunt Active Filters. The methods are overall harmonic compensation and selective harmonic compensation. Both methods are described and analyzed in the paper together with several practical design steps for Adjustable Speed Drives applications. The methods are compared in the case of voltage unbalance and predistortion, common cases in industrial applications. The paper concludes with guidelines of using each method in different cases.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125309738","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 : 2009-05-20DOI: 10.1109/CPE.2009.5156004
A. Moreno-Muñoz, J. D. L. de la Rosa, V. Pallarés, J. Flores
Power-quality events are of increasing concern for the economy because today's equipment, particularly computers and automated manufacturing devices, is highly sensitive to such imperfections. Metering technologies and communications systems have advanced to enable the development of DSP-based sensors. Power system surges, based on waveform shapes, can be classified into “oscillatory transient” and “impulsive transient” This paper investigates the challenges and possibilities in the development of a DSP power-quality event detection algorithm. It provides the real-time detection of transients without requiring a large amount of memory. It is presented its advantages as a simple and robust algorithm, over others well known proposal. Finally, the analysis of its performance in the time domain is addressed on a low-cost DSP board.
{"title":"DSP for the real time detection of power quality surge transients","authors":"A. Moreno-Muñoz, J. D. L. de la Rosa, V. Pallarés, J. Flores","doi":"10.1109/CPE.2009.5156004","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156004","url":null,"abstract":"Power-quality events are of increasing concern for the economy because today's equipment, particularly computers and automated manufacturing devices, is highly sensitive to such imperfections. Metering technologies and communications systems have advanced to enable the development of DSP-based sensors. Power system surges, based on waveform shapes, can be classified into “oscillatory transient” and “impulsive transient” This paper investigates the challenges and possibilities in the development of a DSP power-quality event detection algorithm. It provides the real-time detection of transients without requiring a large amount of memory. It is presented its advantages as a simple and robust algorithm, over others well known proposal. Finally, the analysis of its performance in the time domain is addressed on a low-cost DSP board.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130909939","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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