Pub Date : 2009-05-20DOI: 10.1109/CPE.2009.5156055
D. Floricau, C. Popescu, M. Popescu, E. Floricau, Lucian Spataru
The 3L-NPC (three-level Neutral-Point-Clamped) is the most popular multilevel converter used in high-power medium-voltage applications. An important disadvantage of this structure is the unequal distribution of losses among the switches. The performances of 3L-NPC structure were improved by developing the 3L-ANPC (Active-NPC) converter which have more degrees of freedom. In this paper the switching states are studied for different PWM strategies. A numeric calculus method for the total losses in switches was also presented in order to compare the efficiency for the 3L-NPC and 3L-ANPC converters. The PSIM simulation results are shown in order to validate the analysis of the switching states.
{"title":"A comparison of efficiency for three-level NPC and Active NPC voltage source converters","authors":"D. Floricau, C. Popescu, M. Popescu, E. Floricau, Lucian Spataru","doi":"10.1109/CPE.2009.5156055","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156055","url":null,"abstract":"The 3L-NPC (three-level Neutral-Point-Clamped) is the most popular multilevel converter used in high-power medium-voltage applications. An important disadvantage of this structure is the unequal distribution of losses among the switches. The performances of 3L-NPC structure were improved by developing the 3L-ANPC (Active-NPC) converter which have more degrees of freedom. In this paper the switching states are studied for different PWM strategies. A numeric calculus method for the total losses in switches was also presented in order to compare the efficiency for the 3L-NPC and 3L-ANPC converters. The PSIM simulation results are shown in order to validate the analysis of the switching states.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"418 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":"134515006","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.2009.5156008
A. Saidian, M. Amiri
Power system deregulating has changed the mechanism of system reliability management. This paper presents a technique used for the reliability evaluation of deregulated distribution systems considering priority of load curtailment using reliability network equivalent techniques. A reliability model for each market player in a deregulated power system is introduced in which a generation company is represented by an equivalent multistate generation provider (EMGP) and the transmission system is represented by an equivalent multistate transmission provider (EMTP). A Genco, which has reserve agreements with other Gencos, is represented by an equivalent multistate generation provider with reserve agreement (EMGPWR).This paper has provided a new approach in determining the interrupt value during the Transmission contingency for each customer. Optimal power flow (OPF) is used to replace AC power flow to check network constraints in each contingency state. Reserve agreements between suppliers are considered to improve reliability indices. A reliability test system (RBTS) has been analyzed to illustrate the technique.
{"title":"A novel technique to reliability evaluation considering priority of load curtailment for deregulated distribution system","authors":"A. Saidian, M. Amiri","doi":"10.1109/CPE.2009.5156008","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156008","url":null,"abstract":"Power system deregulating has changed the mechanism of system reliability management. This paper presents a technique used for the reliability evaluation of deregulated distribution systems considering priority of load curtailment using reliability network equivalent techniques. A reliability model for each market player in a deregulated power system is introduced in which a generation company is represented by an equivalent multistate generation provider (EMGP) and the transmission system is represented by an equivalent multistate transmission provider (EMTP). A Genco, which has reserve agreements with other Gencos, is represented by an equivalent multistate generation provider with reserve agreement (EMGPWR).This paper has provided a new approach in determining the interrupt value during the Transmission contingency for each customer. Optimal power flow (OPF) is used to replace AC power flow to check network constraints in each contingency state. Reserve agreements between suppliers are considered to improve reliability indices. A reliability test system (RBTS) has been analyzed to illustrate the technique.","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":"131920167","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.2009.5156051
Z. Raud, V. Vodovozov, T. Jalakas, J. Laugis
Different simulation instruments to study power electronics of motor drive are described. For each educational level, the specific approach and soft tool is proposed. The simulation instruments have been examined and compared in learning environment of Tallinn Technical University.
{"title":"Simulation instruments to study power electronics of motor drives","authors":"Z. Raud, V. Vodovozov, T. Jalakas, J. Laugis","doi":"10.1109/CPE.2009.5156051","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156051","url":null,"abstract":"Different simulation instruments to study power electronics of motor drive are described. For each educational level, the specific approach and soft tool is proposed. The simulation instruments have been examined and compared in learning environment of Tallinn Technical University.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"36 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":"131960462","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.2009.5156065
J. Luszcz
Investigation of common mode (CM) electromagnetic interference (EMI) currents in an AC motor drive fed by the pulse width modulated (PWM) voltage converter requires that parasitic capacitances existing in the converter, motor windings and feeding cable have to be taken into account. The motor voltage transients and related EMI emission are strongly correlated with resonance effects detectable in load circuits. The frequency impedance characteristics analysis allows to identify and determine resonance frequency ranges which are the foremost contribution for voltage ringing phenomena. The paper presents a method of analysis of AC motor windings parasitic capacitances with the particular account of cable influence on the broad-spectrum overall performance. The proposed circuit model allows for analysis of cable parameters effect on the conducted EMI emission of the AC motor drive.
{"title":"Motor cable influence on the converter fed AC motor drive conducted EMI emission","authors":"J. Luszcz","doi":"10.1109/CPE.2009.5156065","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156065","url":null,"abstract":"Investigation of common mode (CM) electromagnetic interference (EMI) currents in an AC motor drive fed by the pulse width modulated (PWM) voltage converter requires that parasitic capacitances existing in the converter, motor windings and feeding cable have to be taken into account. The motor voltage transients and related EMI emission are strongly correlated with resonance effects detectable in load circuits. The frequency impedance characteristics analysis allows to identify and determine resonance frequency ranges which are the foremost contribution for voltage ringing phenomena. The paper presents a method of analysis of AC motor windings parasitic capacitances with the particular account of cable influence on the broad-spectrum overall performance. The proposed circuit model allows for analysis of cable parameters effect on the conducted EMI emission of the AC motor drive.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"63 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":"134403671","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.2009.5156021
A. Sharaf, M. Ammar, I. Altas
A hybrid green micro-cogeneration energy system is studied for village electricity using a large permanent- magnet dc motor. This scheme is introduced in compliance with the current trend of environment-friendly hybrid power generation. Wind energy, solar energy and fuel cells are all potential renewable green sources of energy. The hybrid scheme comprises those three sources of energy in the form of a wind turbine-induction generator assembly, photovoltaic array and a fuel cell (hydrogen). The system is validated with the proposed novel controllers and under load and renewable sources excursions and sudden changes in the photovoltaic array characteristics due to variations in air temperature and solar irradiation. Three key controllers are proposed: thyristor bridge α-firing angle controller, permanent magnet dc motor dynamic speed controller and a novel dc-bus Green-Plug Modulated Power Filter (GPMPF) controller. The proposed micro-cogeneration hybrid system is suitable for small-scale village electricity and water pumping appliances.
{"title":"Hybrid green micro-cogeneration using common dc bus hybrid scheme","authors":"A. Sharaf, M. Ammar, I. Altas","doi":"10.1109/CPE.2009.5156021","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156021","url":null,"abstract":"A hybrid green micro-cogeneration energy system is studied for village electricity using a large permanent- magnet dc motor. This scheme is introduced in compliance with the current trend of environment-friendly hybrid power generation. Wind energy, solar energy and fuel cells are all potential renewable green sources of energy. The hybrid scheme comprises those three sources of energy in the form of a wind turbine-induction generator assembly, photovoltaic array and a fuel cell (hydrogen). The system is validated with the proposed novel controllers and under load and renewable sources excursions and sudden changes in the photovoltaic array characteristics due to variations in air temperature and solar irradiation. Three key controllers are proposed: thyristor bridge α-firing angle controller, permanent magnet dc motor dynamic speed controller and a novel dc-bus Green-Plug Modulated Power Filter (GPMPF) controller. The proposed micro-cogeneration hybrid system is suitable for small-scale village electricity and water pumping appliances.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"18 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":"132917752","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.2009.5156056
C. Sourkounis
Comminuting processes cause stochastic loads with high amplitudes in the electromechanical drive train. In the long run, peak loads cause premature material fatigue of the drive components alongside high thermal loads in the asynchronous machine. Furthermore load peaks arise in the supply grid, which leads to higher overheads (demand charge). A new drive train with a novel non-linear speed control (SC-control) was developed based on the operating performance of commercial comminuting units (e.g. shredding plants), according to the specifications of higher throughput, damping the load peaks arising from the comminuting process and thus also, lowering the voltage fluctuations in the electrical grid. A non-linear SC-control was designed and tested. By this a rotational speed flexible operation of the shredding drive system was realised, so that the rotating masses' kinetic energy is used to smooth the load peak from the process. In this way it was possible to reduce the cumulative load in the drive train, instantaneously achieving high process performance.
{"title":"S-curve-control for active load peak damping in the drive train","authors":"C. Sourkounis","doi":"10.1109/CPE.2009.5156056","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156056","url":null,"abstract":"Comminuting processes cause stochastic loads with high amplitudes in the electromechanical drive train. In the long run, peak loads cause premature material fatigue of the drive components alongside high thermal loads in the asynchronous machine. Furthermore load peaks arise in the supply grid, which leads to higher overheads (demand charge). A new drive train with a novel non-linear speed control (SC-control) was developed based on the operating performance of commercial comminuting units (e.g. shredding plants), according to the specifications of higher throughput, damping the load peaks arising from the comminuting process and thus also, lowering the voltage fluctuations in the electrical grid. A non-linear SC-control was designed and tested. By this a rotational speed flexible operation of the shredding drive system was realised, so that the rotating masses' kinetic energy is used to smooth the load peak from the process. In this way it was possible to reduce the cumulative load in the drive train, instantaneously achieving high process performance.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"58 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":"133525770","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.2009.5156027
A. Kouzou, S. Saadi, M. Mahmoudi, M. Boucherit
The main aim of this paper si the improvement of the output voltage quality of the AC/AC choppers to minimize the harmonics continents and to increase the power factor of the voltage source. Several works were done in this field using classical algorithms to fulfill the objective mentioned. In the present paper the Particle Swarm Optimization (PSO) algorithm is used to achieve the minimization of the harmonic continents of the delivered voltage, to improve the power factor of the voltage source and finally to increase the control range of the outer voltage.
{"title":"Particle Swarm Optimization applied for the improvement of the PWM AC/AC choppers voltage","authors":"A. Kouzou, S. Saadi, M. Mahmoudi, M. Boucherit","doi":"10.1109/CPE.2009.5156027","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156027","url":null,"abstract":"The main aim of this paper si the improvement of the output voltage quality of the AC/AC choppers to minimize the harmonics continents and to increase the power factor of the voltage source. Several works were done in this field using classical algorithms to fulfill the objective mentioned. In the present paper the Particle Swarm Optimization (PSO) algorithm is used to achieve the minimization of the harmonic continents of the delivered voltage, to improve the power factor of the voltage source and finally to increase the control range of the outer voltage.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"39 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":"125108898","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.2009.5156049
P. García-González, A. García-Cerrada, O. Pinzon-Ardila
This paper presents the analysis and the application of a current controller in an active power filter (APF) based on a PWM voltage-source electronic converter with three legs and four wires. The neutral wire is connected to the middle point of the DC-capacitor voltage. The controller proposed here is an extension of the one proposed for a three-wire Shunt Active Power Filter. The controller is a two-level nested controller. The outer-loop generates the reference current for the inner-loop. The latter, is a state-feedback current controller with integral action. The former consists of (i) a selective harmonic elimination technique and (ii) a DC-capacitor-voltage controller. This paper will focus on the neutral-wire current control and on the balance control of the DC-capacitor voltage. The performance of the control algorithm has been demonstrated using a test-rig with balanced and non-balanced non-linear loads.
{"title":"Control of a Shunt Active Power Filter based on a three-leg four-wire electronic converter","authors":"P. García-González, A. García-Cerrada, O. Pinzon-Ardila","doi":"10.1109/CPE.2009.5156049","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156049","url":null,"abstract":"This paper presents the analysis and the application of a current controller in an active power filter (APF) based on a PWM voltage-source electronic converter with three legs and four wires. The neutral wire is connected to the middle point of the DC-capacitor voltage. The controller proposed here is an extension of the one proposed for a three-wire Shunt Active Power Filter. The controller is a two-level nested controller. The outer-loop generates the reference current for the inner-loop. The latter, is a state-feedback current controller with integral action. The former consists of (i) a selective harmonic elimination technique and (ii) a DC-capacitor-voltage controller. This paper will focus on the neutral-wire current control and on the balance control of the DC-capacitor voltage. The performance of the control algorithm has been demonstrated using a test-rig with balanced and non-balanced non-linear loads.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"28 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":"128795989","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.2009.5156047
J. Espina, A. Arias, J. Balcells, C. Ortega
The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and voltage. To safeguard the system's integrity, the PI output is normally limited eventually causing the windup phenomenon characterized by long periods of overshoots which may even result in instability.
{"title":"Speed Anti-Windup PI strategies review for Field Oriented Control of Permanent Magnet Synchronous Machines","authors":"J. Espina, A. Arias, J. Balcells, C. Ortega","doi":"10.1109/CPE.2009.5156047","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156047","url":null,"abstract":"The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and voltage. To safeguard the system's integrity, the PI output is normally limited eventually causing the windup phenomenon characterized by long periods of overshoots which may even result in instability.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"47 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":"129173445","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.2009.5156069
V. Pires, M. Guerreiro, J. Martins, J. F. Silva
In this paper it is proposed a unity power factor isolated three-phase rectifier with buck-boost characteristics. This rectifier is based on the scott transformer and only uses two single-phase buck-boost rectifiers. In this way only two switches are used. To achieve sinusoidal input current and high power factor, a fast and robust pulse with sliding mode modulation of the input current is proposed. An output voltage compensator is also used to establish the amplitude of the reference currents. Several results are presented in order to show the effectiveness of the proposed rectifier.
{"title":"Unity power factor isolated three-phase buck-boost rectifier based on scott transformer","authors":"V. Pires, M. Guerreiro, J. Martins, J. F. Silva","doi":"10.1109/CPE.2009.5156069","DOIUrl":"https://doi.org/10.1109/CPE.2009.5156069","url":null,"abstract":"In this paper it is proposed a unity power factor isolated three-phase rectifier with buck-boost characteristics. This rectifier is based on the scott transformer and only uses two single-phase buck-boost rectifiers. In this way only two switches are used. To achieve sinusoidal input current and high power factor, a fast and robust pulse with sliding mode modulation of the input current is proposed. An output voltage compensator is also used to establish the amplitude of the reference currents. Several results are presented in order to show the effectiveness of the proposed rectifier.","PeriodicalId":272748,"journal":{"name":"2009 Compatibility and Power Electronics","volume":"28 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":"121435114","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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