Pub Date : 2007-10-01DOI: 10.1109/EPC.2007.4520383
G. Dastagir, L. Lopes
This paper discusses the regulation of the voltage and frequency of a stand-alone self-excited squirrel-cage induction generator (SEIG) connected to an unregulated prime mover by means of a single voltage source inverter (VSI) connected in shunt with the stator of the generator. A battery bank is used at the dc side of the VSI so that it can deal active and reactive power and affect the frequency and magnitude of the generated voltage. The focus of this paper is on the experimental results obtained for a 4-pole 2 HP SEIG with an unregulated prime- mover with a linear torque versus speed characteristic typical of impulse type hydro turbines. It shows that active and reactive power control yields a better voltage and frequency regulation to load variations than reactive power alone.
{"title":"Voltage and Frequency Regulation of a Stand-Alone Self-Excited Induction Generator","authors":"G. Dastagir, L. Lopes","doi":"10.1109/EPC.2007.4520383","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520383","url":null,"abstract":"This paper discusses the regulation of the voltage and frequency of a stand-alone self-excited squirrel-cage induction generator (SEIG) connected to an unregulated prime mover by means of a single voltage source inverter (VSI) connected in shunt with the stator of the generator. A battery bank is used at the dc side of the VSI so that it can deal active and reactive power and affect the frequency and magnitude of the generated voltage. The focus of this paper is on the experimental results obtained for a 4-pole 2 HP SEIG with an unregulated prime- mover with a linear torque versus speed characteristic typical of impulse type hydro turbines. It shows that active and reactive power control yields a better voltage and frequency regulation to load variations than reactive power alone.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"17 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116065355","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520357
J. Ghaisari, M. Habibi, A. Bakhshai
Achieving the maximum power is the major and important task in the PV applications. Many of maximum power point tracking, MPPT, methods are developed based on optimal voltage or current factors, which are assumed to be constant. In this paper, a PV system is modeled such that variations of the optimal voltage factor over the environmental conditions are highlighted. An adaptive cascade MPPT controller is proposed to follow the optimal voltage factor in each insolation level, in addition to regulating the output power at its maximum possible value via a boost converter. Simulations are performed to verify the validation of the proposed MPPT system.
{"title":"An MPPT Controller Design for Photovoltaic (PV) Systems Based on the Optimal Voltage Factor Tracking","authors":"J. Ghaisari, M. Habibi, A. Bakhshai","doi":"10.1109/EPC.2007.4520357","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520357","url":null,"abstract":"Achieving the maximum power is the major and important task in the PV applications. Many of maximum power point tracking, MPPT, methods are developed based on optimal voltage or current factors, which are assumed to be constant. In this paper, a PV system is modeled such that variations of the optimal voltage factor over the environmental conditions are highlighted. An adaptive cascade MPPT controller is proposed to follow the optimal voltage factor in each insolation level, in addition to regulating the output power at its maximum possible value via a boost converter. Simulations are performed to verify the validation of the proposed MPPT system.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123491621","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520306
J. Morneau, C. Abbey, G. Joós
Doubly fed induction generators (DFIG) offer many advantage when used with wind turbines. Given their configuration, they are particularly sensitive to grid faults. As many countries now require wind turbine generators to remain connected to the grid during faults, low voltage ride through solutions are being developed to fulfill this new requirement. This paper offers a comparison of different LVRT solutions. The effects of each method on a small network containing both conventional generators and wind turbines are investigated. The performance of the different solutions is evaluated based on the wind turbines response.
{"title":"Effect of Low Voltage Ride Through Technologies on Wind Farm","authors":"J. Morneau, C. Abbey, G. Joós","doi":"10.1109/EPC.2007.4520306","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520306","url":null,"abstract":"Doubly fed induction generators (DFIG) offer many advantage when used with wind turbines. Given their configuration, they are particularly sensitive to grid faults. As many countries now require wind turbine generators to remain connected to the grid during faults, low voltage ride through solutions are being developed to fulfill this new requirement. This paper offers a comparison of different LVRT solutions. The effects of each method on a small network containing both conventional generators and wind turbines are investigated. The performance of the different solutions is evaluated based on the wind turbines response.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130783329","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520341
Xin Li, S. Williamson
It is obvious that the transportation sector consumes a large portion of the global oil and emits a vast amount of greenhouse gases (GHG). Furthermore, sets of serious issues, such as environmental pollution, global warming, and petroleum shortage have been brought to the attention of governments worldwide. For the latest two decades, with the intention of meeting the rigorous governmental environment regulations, researchers and vehicle manufactures have been seeking an alternative way to reduce GHG emission and developing a more efficient way to make use of the oil resources. Many studies indicate that electrifying the drive train is the trend of future vehicle development. But in short term, due to commercial conflicts and technical reasons, hybridizing is a popular vehicle alternative. In this paper, an overview of the history of efficiency improvement in terms of hybrid electrical vehicle (HEV) system configurations, battery technologies, power electronic converter topologies, and motor selection will be presented. In addition, the potentials of using HEV and electric vehicle (EV) technologies, to reduce GHG emissions and overall oil consumption, are discussed in detail. Finally, few realistic conflicts and commercialization issues for using the above mentioned efficiency improving techniques are also highlighted in this paper.
{"title":"Assessment of Efficiency Improvement Techniques for Future Power Electronics Intensive Hybrid Electric Vehicle Drive Trains","authors":"Xin Li, S. Williamson","doi":"10.1109/EPC.2007.4520341","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520341","url":null,"abstract":"It is obvious that the transportation sector consumes a large portion of the global oil and emits a vast amount of greenhouse gases (GHG). Furthermore, sets of serious issues, such as environmental pollution, global warming, and petroleum shortage have been brought to the attention of governments worldwide. For the latest two decades, with the intention of meeting the rigorous governmental environment regulations, researchers and vehicle manufactures have been seeking an alternative way to reduce GHG emission and developing a more efficient way to make use of the oil resources. Many studies indicate that electrifying the drive train is the trend of future vehicle development. But in short term, due to commercial conflicts and technical reasons, hybridizing is a popular vehicle alternative. In this paper, an overview of the history of efficiency improvement in terms of hybrid electrical vehicle (HEV) system configurations, battery technologies, power electronic converter topologies, and motor selection will be presented. In addition, the potentials of using HEV and electric vehicle (EV) technologies, to reduce GHG emissions and overall oil consumption, are discussed in detail. Finally, few realistic conflicts and commercialization issues for using the above mentioned efficiency improving techniques are also highlighted in this paper.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134249480","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520344
A. Al-Judi, N. Benaifa, M. A. Rahim, E. Nowicki
Some renewable energy sources provide dc electrical energy. For example, photovoltaic sources, fuel cells, and the rectified output of some turbine driven sources, produce dc voltages. If the outputs of these devices are to be fed to the ac power grid, a power interface is required. The cascaded h-bridge multilevel inverter is an electronic interface that can connect multiple dc energy sources to an ac power system. In this paper we present an analysis to demonstrate the degree to which the total harmonic distortion of a cascaded H-bridge can be reduced by having some H- bridges provide 3-level voltage contributions in each half-cycle of the stepped output voltage waveform. Such 3-level operation produces a very significant distortion reduction, the result of an increase in the number of steps.
{"title":"Increased Number of Voltage Steps for Cascaded H-bridge Multilevel Inverters using 3-level Operation in each Half-cycle","authors":"A. Al-Judi, N. Benaifa, M. A. Rahim, E. Nowicki","doi":"10.1109/EPC.2007.4520344","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520344","url":null,"abstract":"Some renewable energy sources provide dc electrical energy. For example, photovoltaic sources, fuel cells, and the rectified output of some turbine driven sources, produce dc voltages. If the outputs of these devices are to be fed to the ac power grid, a power interface is required. The cascaded h-bridge multilevel inverter is an electronic interface that can connect multiple dc energy sources to an ac power system. In this paper we present an analysis to demonstrate the degree to which the total harmonic distortion of a cascaded H-bridge can be reduced by having some H- bridges provide 3-level voltage contributions in each half-cycle of the stepped output voltage waveform. Such 3-level operation produces a very significant distortion reduction, the result of an increase in the number of steps.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128749471","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520381
R. Ahshan, M. Iqbal, G. Mann
Performance of a novel controller to connect/disconnect an induction-generator based wind turbine from the grid is presented in this paper. The designed controller senses the generator and grid voltages, frequencies, and current flow between the generator and the grid. A low cost instrumentation circuitry has been developed to measure the generator and the grid parameters. Based on the measurement of voltages and frequencies of the wind turbine generator and the grid side, a control decision is taken to connect the system to the grid. The controller makes decision to disconnect the system from the grid based on the current flow measurement between the wind turbine and the grid. The controller is now undergoing testing at the energy system Lab at the Memorial University of Newfoundland. The prototype controller has been developed using 'PIC16F877' micro-controller. This paper presents system details and some test results.
{"title":"Performance of a Controller for Small Grid Connected Wind Turbines","authors":"R. Ahshan, M. Iqbal, G. Mann","doi":"10.1109/EPC.2007.4520381","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520381","url":null,"abstract":"Performance of a novel controller to connect/disconnect an induction-generator based wind turbine from the grid is presented in this paper. The designed controller senses the generator and grid voltages, frequencies, and current flow between the generator and the grid. A low cost instrumentation circuitry has been developed to measure the generator and the grid parameters. Based on the measurement of voltages and frequencies of the wind turbine generator and the grid side, a control decision is taken to connect the system to the grid. The controller makes decision to disconnect the system from the grid based on the current flow measurement between the wind turbine and the grid. The controller is now undergoing testing at the energy system Lab at the Memorial University of Newfoundland. The prototype controller has been developed using 'PIC16F877' micro-controller. This paper presents system details and some test results.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127368641","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520390
V. Minea
This paper is a review of thermodynamic cycles applied to recover geothermal energy and industrial waste high enthalpy heat to produce electrical power. While geothermal power generation may supply up to 10% of United States base-load electricity by 2050, in Canada, ORC and Kalina cycles may produce power in the future especially with industrial waste heat and biomass.
{"title":"Using Geothermal Energy and Industrial Waste Heat for Power Generation","authors":"V. Minea","doi":"10.1109/EPC.2007.4520390","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520390","url":null,"abstract":"This paper is a review of thermodynamic cycles applied to recover geothermal energy and industrial waste high enthalpy heat to produce electrical power. While geothermal power generation may supply up to 10% of United States base-load electricity by 2050, in Canada, ORC and Kalina cycles may produce power in the future especially with industrial waste heat and biomass.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"334 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121686166","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520315
Q. Ahsan, M.T. Alam
Bangladesh power system (BPS) is forced to curtail electric demand during the peak hours; usually evening, of the day throughout the year and most of the hours of the day in the summer. Although the lower available generation capacity compared to demand is the reason of this crisis, however, it may be reduced if the present hydro resource is optimally utilized. This paper investigates the impacts of the exhaustive use of the existing energy limited (EL) hydro plant on the reliability and production cost with a view to provide a guideline to the system planner. It compares the reliability and production costs of BPS with the conventional use of hydro resource with those with the optimal hydro resource use. The investigation period ranges from the last one year to coming nineteen years. To create a feeling about the magnitude of the crisis among the utility planners and consumers the interruption cost of the unserved energy is evaluated. The simulation results seem to be useful for the system planners.
{"title":"Electrical Power Crisis in Bangladesh: Impacts of the Optimal Use of Energy Limited Hydro Unit on the System Reliability and Production Cost","authors":"Q. Ahsan, M.T. Alam","doi":"10.1109/EPC.2007.4520315","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520315","url":null,"abstract":"Bangladesh power system (BPS) is forced to curtail electric demand during the peak hours; usually evening, of the day throughout the year and most of the hours of the day in the summer. Although the lower available generation capacity compared to demand is the reason of this crisis, however, it may be reduced if the present hydro resource is optimally utilized. This paper investigates the impacts of the exhaustive use of the existing energy limited (EL) hydro plant on the reliability and production cost with a view to provide a guideline to the system planner. It compares the reliability and production costs of BPS with the conventional use of hydro resource with those with the optimal hydro resource use. The investigation period ranges from the last one year to coming nineteen years. To create a feeling about the magnitude of the crisis among the utility planners and consumers the interruption cost of the unserved energy is evaluated. The simulation results seem to be useful for the system planners.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121927084","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520358
A.A. Ahmad, A. Abrishamifar
Due to the internal losses of fuel cells, its load regulation is not better than 30% from the no load to full load conditions. To increase the utilization of full cell, this paper proposed a two switch buck-boost converter with a simple current mode controller. This structure performs conversion with lower stresses than the single switch types. In this approach problem of interference between buck and boost switches performance are solved by determining four operation modes for the converter. The experimental results of an 110 V, 40 KW converter show the ability of the control method. The line and load regulation in different situation is below than 0.9%.
{"title":"A Simple Current Mode Controller for Two Switches Buck-Boost Converter for Fuel Cells","authors":"A.A. Ahmad, A. Abrishamifar","doi":"10.1109/EPC.2007.4520358","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520358","url":null,"abstract":"Due to the internal losses of fuel cells, its load regulation is not better than 30% from the no load to full load conditions. To increase the utilization of full cell, this paper proposed a two switch buck-boost converter with a simple current mode controller. This structure performs conversion with lower stresses than the single switch types. In this approach problem of interference between buck and boost switches performance are solved by determining four operation modes for the converter. The experimental results of an 110 V, 40 KW converter show the ability of the control method. The line and load regulation in different situation is below than 0.9%.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131192995","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 : 2007-10-01DOI: 10.1109/EPC.2007.4520338
D. Aguglia, R. Wamkeue, P. Viarouge, J. Cros
This paper presents a detailed methodology for the estimation and optimization of the annualized performances of wind turbines equipped with doubly-fed induction generators (DFIG). The method takes into account the losses and ratings of different system components : gearbox, DFIG, and power converters. The influence of the DC-bus voltage limit of the power converters on the annual energy yield reduction is analyzed and quantified. The influence of the blade pitch angle control strategy is also discussed and the compromises between the characteristics of the different system components are investigated. The methodology is applied to 2MW wind power plant.
{"title":"Optimizing the Annual Energy Production of Doubly-Fed Induction Generator Based Wind Turbines","authors":"D. Aguglia, R. Wamkeue, P. Viarouge, J. Cros","doi":"10.1109/EPC.2007.4520338","DOIUrl":"https://doi.org/10.1109/EPC.2007.4520338","url":null,"abstract":"This paper presents a detailed methodology for the estimation and optimization of the annualized performances of wind turbines equipped with doubly-fed induction generators (DFIG). The method takes into account the losses and ratings of different system components : gearbox, DFIG, and power converters. The influence of the DC-bus voltage limit of the power converters on the annual energy yield reduction is analyzed and quantified. The influence of the blade pitch angle control strategy is also discussed and the compromises between the characteristics of the different system components are investigated. The methodology is applied to 2MW wind power plant.","PeriodicalId":196861,"journal":{"name":"2007 IEEE Canada Electrical Power Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117221995","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：