Pub Date : 2010-06-15DOI: 10.1109/ISNCC.2010.5524474
J. Willems
This tutorial paper reviews the fundamentals of different methods for current decomposition and non-active power compensation in poly-phase power systems. The basic concepts and the properties of the instantaneous active and reactive power theory and of the active/reactive average power theory are discussed and critically compared.
{"title":"Reflections on power theories for poly-phase nonsinusoidal voltages and currents","authors":"J. Willems","doi":"10.1109/ISNCC.2010.5524474","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524474","url":null,"abstract":"This tutorial paper reviews the fundamentals of different methods for current decomposition and non-active power compensation in poly-phase power systems. The basic concepts and the properties of the instantaneous active and reactive power theory and of the active/reactive average power theory are discussed and critically compared.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127307029","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524483
I. Shchur
The task of reducing the energy loss is especially important for alternative electricity generation systems from renewable sources. In electromechanical systems with variable angular speed of permanent-magnet synchronous generator (PMSG), the harmonic components of generator voltages and currents in transient and steady state have impact on energy efficiency. This paper compares the energy performance of basic schemes of taking of power from PMSG in a wind generation system. It investigates the nature of harmonic distortions of voltages and currents at the generator load on the diode bridge and assesses their impact on energy efficiency in steady-state under different wind speeds and, consequently, power. The PMSG load on active rectifier is characterized by minimal losses, but harmonic distortions appear there in transient conditions, which dominate in the alternative power plants. The paper suggests compensating of loss from transitional harmonics by the way of regulation of the generator's excitation. Simulations results are presented to illustrate the performance of the proposed method.
{"title":"Impact of nonsinusoidalness on Efficiency of alternative electricity generation systems","authors":"I. Shchur","doi":"10.1109/ISNCC.2010.5524483","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524483","url":null,"abstract":"The task of reducing the energy loss is especially important for alternative electricity generation systems from renewable sources. In electromechanical systems with variable angular speed of permanent-magnet synchronous generator (PMSG), the harmonic components of generator voltages and currents in transient and steady state have impact on energy efficiency. This paper compares the energy performance of basic schemes of taking of power from PMSG in a wind generation system. It investigates the nature of harmonic distortions of voltages and currents at the generator load on the diode bridge and assesses their impact on energy efficiency in steady-state under different wind speeds and, consequently, power. The PMSG load on active rectifier is characterized by minimal losses, but harmonic distortions appear there in transient conditions, which dominate in the alternative power plants. The paper suggests compensating of loss from transitional harmonics by the way of regulation of the generator's excitation. Simulations results are presented to illustrate the performance of the proposed method.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129471501","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524515
S. Czapp
In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. The impact of these distorted currents on the fibrillation effect is evaluated. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequencies is discussed. Operational characteristic of the proposed residual current device is presented.
{"title":"The effect of PWM frequency on the effectiveness of protection against electric shock using residual current devices","authors":"S. Czapp","doi":"10.1109/ISNCC.2010.5524515","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524515","url":null,"abstract":"In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. The impact of these distorted currents on the fibrillation effect is evaluated. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequencies is discussed. Operational characteristic of the proposed residual current device is presented.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121466461","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524506
M. Hartman
The Budeanu's concept of circuit analyses with nonsinusoidal voltages and currents has been presented in details with Author's comments. It has been reminded that Bunet was the first who proposed summing up reactive powers of the harmonics of nonsinusoidal waveforms. This postulate was included in so called Boucherot theorem. It has been shown that proposed by Budeanu vectors presenting the reactive power QB and deformation power D not always are orthogonal. Based on mathematical calculation Author pointed out that drawing general conclusion about orthogonality of these powers is not justifiable.
{"title":"Orthogonality of functions describing power states in electrical circuits in Budeanu's concept","authors":"M. Hartman","doi":"10.1109/ISNCC.2010.5524506","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524506","url":null,"abstract":"The Budeanu's concept of circuit analyses with nonsinusoidal voltages and currents has been presented in details with Author's comments. It has been reminded that Bunet was the first who proposed summing up reactive powers of the harmonics of nonsinusoidal waveforms. This postulate was included in so called Boucherot theorem. It has been shown that proposed by Budeanu vectors presenting the reactive power QB and deformation power D not always are orthogonal. Based on mathematical calculation Author pointed out that drawing general conclusion about orthogonality of these powers is not justifiable.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132362353","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524486
D. del Puerto-Flores, J. Scherpen, R. Ortega
Recently, it has been established that the problem of power factor compensation (PFC) for nonlinear loads with non-sinusoidal source voltage can be recast in terms of the property of cyclodissipativity. Using this framework we study the PFC for nonlinear loads containing a memoryless nonlinearity. We show that the power factor is improved by lossless linear time invariant filter if and only if a certain equalization condition between the weighted powers of inductors and capacitors of the load is ensured.
{"title":"On power factor improvement by lossless linear filters in the nonlinear nonsinusoidal case","authors":"D. del Puerto-Flores, J. Scherpen, R. Ortega","doi":"10.1109/ISNCC.2010.5524486","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524486","url":null,"abstract":"Recently, it has been established that the problem of power factor compensation (PFC) for nonlinear loads with non-sinusoidal source voltage can be recast in terms of the property of cyclodissipativity. Using this framework we study the PFC for nonlinear loads containing a memoryless nonlinearity. We show that the power factor is improved by lossless linear time invariant filter if and only if a certain equalization condition between the weighted powers of inductors and capacitors of the load is ensured.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129161814","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524470
V. Staudt
Power-grid connected voltage-source converters provide two-way energy exchange with the grid. They are used for renewable energy applications, combined heat and power, active filtering and loads with dynamically changing working conditions. Aggravated grid codes and dynamic loads require very fast control methods. A control based on the integral of the grid voltage (called grid flux) offers extremely fast dynamics and graphical understanding.
{"title":"Dynamic grid-flux-based control for grid connected voltage-source converters","authors":"V. Staudt","doi":"10.1109/ISNCC.2010.5524470","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524470","url":null,"abstract":"Power-grid connected voltage-source converters provide two-way energy exchange with the grid. They are used for renewable energy applications, combined heat and power, active filtering and loads with dynamically changing working conditions. Aggravated grid codes and dynamic loads require very fast control methods. A control based on the integral of the grid voltage (called grid flux) offers extremely fast dynamics and graphical understanding.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130447497","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524501
M. Krystkowiak, M. Gwóźdź
In this paper the structure of control system of power electronics current modulator is presented. This converter is placed in output circuit of 3-phase diode rectifier. With aid of such solution, power grid current of decribed rectifier is almost sinusoidal. Different structures of current regulator - part of control circuit - are considered. Chosen results of simulation and experimental researches are presented also.
{"title":"Simulation and experimental models of 3-phase diode rectifier with power electronics current modulator","authors":"M. Krystkowiak, M. Gwóźdź","doi":"10.1109/ISNCC.2010.5524501","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524501","url":null,"abstract":"In this paper the structure of control system of power electronics current modulator is presented. This converter is placed in output circuit of 3-phase diode rectifier. With aid of such solution, power grid current of decribed rectifier is almost sinusoidal. Different structures of current regulator - part of control circuit - are considered. Chosen results of simulation and experimental researches are presented also.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131731589","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524482
S. Schostan, K.-D. Dettmann, Ilir Purellku, D. Schulz
Wind energy converters feeding into the power grid must comply with standards for harmonics. In practice harmonics or subharmonics caused by the generator are difficult to measure, because the grid itself is also distorted. This paper describes test-bench measurements that are performed with an ideal balanced and sinusoidal voltage source instead of a grid. The results show, which significant frequencies the generator and the converter produce and how they interact with the grid. Sources for these frequencies are explained. The stator side collective power components are calculated and their effect on the time variable asymmetry of the stator current of the three-phase system is investigated.
{"title":"Harmonics and powers of doubly fed induction generators at balanced sinusoidal voltages","authors":"S. Schostan, K.-D. Dettmann, Ilir Purellku, D. Schulz","doi":"10.1109/ISNCC.2010.5524482","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524482","url":null,"abstract":"Wind energy converters feeding into the power grid must comply with standards for harmonics. In practice harmonics or subharmonics caused by the generator are difficult to measure, because the grid itself is also distorted. This paper describes test-bench measurements that are performed with an ideal balanced and sinusoidal voltage source instead of a grid. The results show, which significant frequencies the generator and the converter produce and how they interact with the grid. Sources for these frequencies are explained. The stator side collective power components are calculated and their effect on the time variable asymmetry of the stator current of the three-phase system is investigated.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115216701","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524523
R. Bartelt, M. Oettmeier, C. Heising, V. Staudt
Active Front End converters (AFE) connect a DC link to a grid, usually with three phases. They allow energy flow in both directions, reduce grid-current harmonics, needed short-circuit power and non-active power in comparison to diode or thyristor-based devices. One more advantage, with is in the center of this paper, is the dynamic reaction to load variations combined with the need for robust control under varying grid parameters. The worst-case variations of grid parameters, in this context, are voltage sags and voltage unsymmetry (e.g. phase faults). This paper presents a control concept employing an inner, virtual-grid-flux based control for fast current control and an outer DC-link voltage control with a conventional PI controller. The layout of the controllers is detailed. Simulations characterise the dynamic performance concerning load variation and grid parameter variation. A comparison of measured and simulated result of a step-wise load change proves the validity of the simulation and the control concept.
{"title":"Flux-based control of 3-phase Active Front End","authors":"R. Bartelt, M. Oettmeier, C. Heising, V. Staudt","doi":"10.1109/ISNCC.2010.5524523","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524523","url":null,"abstract":"Active Front End converters (AFE) connect a DC link to a grid, usually with three phases. They allow energy flow in both directions, reduce grid-current harmonics, needed short-circuit power and non-active power in comparison to diode or thyristor-based devices. One more advantage, with is in the center of this paper, is the dynamic reaction to load variations combined with the need for robust control under varying grid parameters. The worst-case variations of grid parameters, in this context, are voltage sags and voltage unsymmetry (e.g. phase faults). This paper presents a control concept employing an inner, virtual-grid-flux based control for fast current control and an outer DC-link voltage control with a conventional PI controller. The layout of the controllers is detailed. Simulations characterise the dynamic performance concerning load variation and grid parameter variation. A comparison of measured and simulated result of a step-wise load change proves the validity of the simulation and the control concept.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115403655","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524469
Antonello Monti, F. Ponci, A. Benigni, Junqi Liu
This paper provides an overview of the challenges, their potential solutions and the trends in the control of electrical power distribution in presence of distributed generation. Power grids are supposed to go through a significant transformation in the close future. Distribution is supposed to be mostly affected. The tutorial reviews the current practice and outlines the possible evolutions towards a more intelligent grid able to operate more dynamically mostly under the hypothesis of a large penetration of renewable energy sources or distributed energy sources more in general. Some specific topics are then addressed with reference to recent research results such network-based control, distributed state estimation and distributed intelligence.
{"title":"Distributed intelligence for smart grid control","authors":"Antonello Monti, F. Ponci, A. Benigni, Junqi Liu","doi":"10.1109/ISNCC.2010.5524469","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524469","url":null,"abstract":"This paper provides an overview of the challenges, their potential solutions and the trends in the control of electrical power distribution in presence of distributed generation. Power grids are supposed to go through a significant transformation in the close future. Distribution is supposed to be mostly affected. The tutorial reviews the current practice and outlines the possible evolutions towards a more intelligent grid able to operate more dynamically mostly under the hypothesis of a large penetration of renewable energy sources or distributed energy sources more in general. Some specific topics are then addressed with reference to recent research results such network-based control, distributed state estimation and distributed intelligence.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121839581","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：