Pub Date : 2011-05-11DOI: 10.1109/POWERENG.2011.6036565
S. Javadian, M. Haghifam, M. Massaeli
Using Distributed Generation (DG) is an interesting topic that has drawn attention of electrical engineers in recent years. The presence of these generation units in distribution systems, although has many advantages and benefits, has to be applied after performing detailed studies and investigations due to their complexities in operation, control and protection of network. One of the major effects of DGs is their effect on protection operation of distribution networks. In this paper after reviewing this influence, risk analysis of protection system's operation in a test distribution network according to various locations and capacities of DGs has been performed. For this purpose, three indexes for presenting the system's risk has been introduced and calculated in different investigated cases.
{"title":"Risk analysis of protection system's operation in distribution networks with DG","authors":"S. Javadian, M. Haghifam, M. Massaeli","doi":"10.1109/POWERENG.2011.6036565","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036565","url":null,"abstract":"Using Distributed Generation (DG) is an interesting topic that has drawn attention of electrical engineers in recent years. The presence of these generation units in distribution systems, although has many advantages and benefits, has to be applied after performing detailed studies and investigations due to their complexities in operation, control and protection of network. One of the major effects of DGs is their effect on protection operation of distribution networks. In this paper after reviewing this influence, risk analysis of protection system's operation in a test distribution network according to various locations and capacities of DGs has been performed. For this purpose, three indexes for presenting the system's risk has been introduced and calculated in different investigated cases.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125251204","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036548
F. Ruiz-Rodriguez, M. Gómez-González, F. Jurado
The voltage regulation is one of the main problems to be dealt in distributed generation photovoltaic systems. Loads and distributed generation production can be assumed as random variables. Results demonstrate that the suggested method can be applied for the maintaining of voltages within established limits at all load nodes of a photovoltaic grid-connected system (PVGCS). To assess the performance of photovoltaic system, this work proposes a probabilistic model that takes into account the random nature of solar irradiance and load. In this paper is presented a new method employing discrete particle swarm optimization and probabilistic radial load flow. Computer simulation reduction evidences a better performance of the new probabilistic load flow in comparison to Monte Carlo simulation. Satisfactory solutions are reached in a smaller number of iterations. Hence, convergence is quickly reached and computational cost is low enough than that demanded for Monte Carlo simulation.
{"title":"Improving voltage profile in radial distribution systems using binary particle swarm optimization and probabilistic load flow","authors":"F. Ruiz-Rodriguez, M. Gómez-González, F. Jurado","doi":"10.1109/POWERENG.2011.6036548","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036548","url":null,"abstract":"The voltage regulation is one of the main problems to be dealt in distributed generation photovoltaic systems. Loads and distributed generation production can be assumed as random variables. Results demonstrate that the suggested method can be applied for the maintaining of voltages within established limits at all load nodes of a photovoltaic grid-connected system (PVGCS). To assess the performance of photovoltaic system, this work proposes a probabilistic model that takes into account the random nature of solar irradiance and load. In this paper is presented a new method employing discrete particle swarm optimization and probabilistic radial load flow. Computer simulation reduction evidences a better performance of the new probabilistic load flow in comparison to Monte Carlo simulation. Satisfactory solutions are reached in a smaller number of iterations. Hence, convergence is quickly reached and computational cost is low enough than that demanded for Monte Carlo simulation.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129039057","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036425
D. Silva, S. Vieira, C. Lima, J. Martins
Housing in the EU contributes approximately with 25% regarding all C02 emissions; therefore, it is imperative that we find robust methodologies to reduce it. This paper intents to be a contribution to valuable savings in root energy consumption without unduly compromising comfort and convenience. The developed prototype is a Plug and Play Instrumentation Kit, as part of a HOMe energy advisER system (HOMER). This system acts as a packaged Energy Assessment Instrumentation "kit" to be made available to homeowners, landlords and tenants in order to help them reducing their energy bill through real accounts of energy usage and links with lifestyle patterns. This is essential for countries to meet the national, European and world targets for energy reduction (and renewable sources). The all system is wireless based so that it can be easily installed and uninstalled in every home.
{"title":"Home energy saving adviser system","authors":"D. Silva, S. Vieira, C. Lima, J. Martins","doi":"10.1109/POWERENG.2011.6036425","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036425","url":null,"abstract":"Housing in the EU contributes approximately with 25% regarding all C02 emissions; therefore, it is imperative that we find robust methodologies to reduce it. This paper intents to be a contribution to valuable savings in root energy consumption without unduly compromising comfort and convenience. The developed prototype is a Plug and Play Instrumentation Kit, as part of a HOMe energy advisER system (HOMER). This system acts as a packaged Energy Assessment Instrumentation \"kit\" to be made available to homeowners, landlords and tenants in order to help them reducing their energy bill through real accounts of energy usage and links with lifestyle patterns. This is essential for countries to meet the national, European and world targets for energy reduction (and renewable sources). The all system is wireless based so that it can be easily installed and uninstalled in every home.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133622759","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036544
V. Pires, J. Martins, Chen Hao
In this paper a novel power conversion structure for grid-connected photovoltaic applications is presented. The proposed structure uses a four-wire voltage source inverter, two single-phase voltage source inverters and a scott transformer. PV modules arrangements can be divided in several groups. This power conversion structure is suitable for multi-string technology. The proposed structure allows multilevel output voltage. A sinusoidal pulse with modulator particularly adapted to this power converter structure is also proposed. Several simulation results are presented in order to verify the effectiveness of the proposed system.
{"title":"A modular multilevel power converter system for photovoltaic applications","authors":"V. Pires, J. Martins, Chen Hao","doi":"10.1109/POWERENG.2011.6036544","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036544","url":null,"abstract":"In this paper a novel power conversion structure for grid-connected photovoltaic applications is presented. The proposed structure uses a four-wire voltage source inverter, two single-phase voltage source inverters and a scott transformer. PV modules arrangements can be divided in several groups. This power conversion structure is suitable for multi-string technology. The proposed structure allows multilevel output voltage. A sinusoidal pulse with modulator particularly adapted to this power converter structure is also proposed. Several simulation results are presented in order to verify the effectiveness of the proposed system.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130514988","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036562
Mohammed Abbas, M. Majeed, M. Kassas, F. Ahmad
Dynamic and static starting motor starting studies were conducted for the largest motor (13.2 kV, 3200kW) in a Saudi-based urea manufacturing plant for peak load and worst case scenarios. The results of these motor simulation studies indicate no motor starting problems in the peak load scenario. Motor starting in the worst case plant operating conditions however was found to cause significant voltage dips that can affect plant operation. Based on the motor starting simulation results, the necessary remedial measures are suggested for ensuring trouble-free plant operation in worst case conditions.
{"title":"Motor starting study for a urea manufacturing plant","authors":"Mohammed Abbas, M. Majeed, M. Kassas, F. Ahmad","doi":"10.1109/POWERENG.2011.6036562","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036562","url":null,"abstract":"Dynamic and static starting motor starting studies were conducted for the largest motor (13.2 kV, 3200kW) in a Saudi-based urea manufacturing plant for peak load and worst case scenarios. The results of these motor simulation studies indicate no motor starting problems in the peak load scenario. Motor starting in the worst case plant operating conditions however was found to cause significant voltage dips that can affect plant operation. Based on the motor starting simulation results, the necessary remedial measures are suggested for ensuring trouble-free plant operation in worst case conditions.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128164055","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036557
Wei Cui, Hang Zhang, Yanhua Ma, Yuejin Zhang
This paper describes an optimal regenerative braking control scheme for a permanent magnet brushless DC motor of an electric motorcycle to achieve dual goals of the electric brake and the maximal power harvest in two cases of the road, downhill and flat, without any additional changes on the hardware. Based on regenerative braking of brushless DC motor in half bridge modulation mode, the relationship between average regenerative current on the DC bus and PWM duty cycle under different speeds was studied intensively from the three aspects of theoretical deduction, simulation based on Matlab/Simulink and platform experiments, and then a simple but effective scheme considering the actual application was proposed tentatively to achieve the dual goals. Since the braking kinetic energy is harvested in the form of the electric energy stored up in battery, the scheme could improve the driving range, safeness, noise preventability and cost effective of electric motorcycles.
{"title":"Regenerative braking control method and optimal scheme for electric motorcycle","authors":"Wei Cui, Hang Zhang, Yanhua Ma, Yuejin Zhang","doi":"10.1109/POWERENG.2011.6036557","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036557","url":null,"abstract":"This paper describes an optimal regenerative braking control scheme for a permanent magnet brushless DC motor of an electric motorcycle to achieve dual goals of the electric brake and the maximal power harvest in two cases of the road, downhill and flat, without any additional changes on the hardware. Based on regenerative braking of brushless DC motor in half bridge modulation mode, the relationship between average regenerative current on the DC bus and PWM duty cycle under different speeds was studied intensively from the three aspects of theoretical deduction, simulation based on Matlab/Simulink and platform experiments, and then a simple but effective scheme considering the actual application was proposed tentatively to achieve the dual goals. Since the braking kinetic energy is harvested in the form of the electric energy stored up in battery, the scheme could improve the driving range, safeness, noise preventability and cost effective of electric motorcycles.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134033827","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036494
Ting Liu, Shoudao Huang, Jian Gao
In this paper, an optimal design method of a high power permanent magnet synchronous generator (PMSG) turbine by wind is proposed. The expression of the cogging torque was studied based on the Fourier analysis. A method of permanent magnet shifting to reduce cogging torque was presented. In this paper a prototype for 5MW generator was built and a comparative study of the performance both of no load and rated load was made based on finite element analysis (FEA) for the machine with the normal magnets and the machine with the shifted magnets. It was proved that the cogging torque and the harmonics of the back electro motive force (EMF) can be greatly reduced by the proposed method. With this PM shifting method, it is helpful to obtain the better performance of the direct-drive PMSG.
{"title":"Optimal design of the direct-driven high power permanent magnet generator turbine by wind","authors":"Ting Liu, Shoudao Huang, Jian Gao","doi":"10.1109/POWERENG.2011.6036494","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036494","url":null,"abstract":"In this paper, an optimal design method of a high power permanent magnet synchronous generator (PMSG) turbine by wind is proposed. The expression of the cogging torque was studied based on the Fourier analysis. A method of permanent magnet shifting to reduce cogging torque was presented. In this paper a prototype for 5MW generator was built and a comparative study of the performance both of no load and rated load was made based on finite element analysis (FEA) for the machine with the normal magnets and the machine with the shifted magnets. It was proved that the cogging torque and the harmonics of the back electro motive force (EMF) can be greatly reduced by the proposed method. With this PM shifting method, it is helpful to obtain the better performance of the direct-drive PMSG.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134407174","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036555
J. Cunill-Sola, J. J. Mesas, L. Sainz
The current number of compact fluorescent lamps (CFL) in power distribution systems is increasing because of their low energy consumption, in comparison with traditional incandescent lamps, and their long average useful life. This paper studies CFL modeling. A "black box" model of CFLs is presented and the analytical expressions of CFL harmonic currents are provided. The study is based on experimental measurements, and numerical simulations with the PSpice simulation program and customized MATLAB software for harmonic analysis.
{"title":"Low-watt compact fluorescent lamps with electronic ballasts","authors":"J. Cunill-Sola, J. J. Mesas, L. Sainz","doi":"10.1109/POWERENG.2011.6036555","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036555","url":null,"abstract":"The current number of compact fluorescent lamps (CFL) in power distribution systems is increasing because of their low energy consumption, in comparison with traditional incandescent lamps, and their long average useful life. This paper studies CFL modeling. A \"black box\" model of CFLs is presented and the analytical expressions of CFL harmonic currents are provided. The study is based on experimental measurements, and numerical simulations with the PSpice simulation program and customized MATLAB software for harmonic analysis.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936144","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036426
D. Foito, J. Martins, V. Pires, J. Maia
This paper proposes a new fault diagnosis methodology for of high power factor rectifiers. This method Is based on the combined with input line currents three dimensional space and the use of the on Principal Component Analysis (PCA). With the proposed method it is possible to detect and identify the power switch in which the fault has occurred. Such detection requires only the measurement the rectifier input currents. Simulation and experimental results are presented, considering for both healthy and faulty cases, to demonstrate the correctness of the proposed method.
{"title":"Fault diagnosis method for three-phase high power factor rectifier based on a pattern recognition algorithm","authors":"D. Foito, J. Martins, V. Pires, J. Maia","doi":"10.1109/POWERENG.2011.6036426","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036426","url":null,"abstract":"This paper proposes a new fault diagnosis methodology for of high power factor rectifiers. This method Is based on the combined with input line currents three dimensional space and the use of the on Principal Component Analysis (PCA). With the proposed method it is possible to detect and identify the power switch in which the fault has occurred. Such detection requires only the measurement the rectifier input currents. Simulation and experimental results are presented, considering for both healthy and faulty cases, to demonstrate the correctness of the proposed method.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128711760","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 : 2011-05-11DOI: 10.1109/POWERENG.2011.6036505
R. S. Herrera, P. Salmerón, S. P. Litrán
The identification of distortion sources in a power system is a topic unsolved. The problem has a difficult solution because there are elements in the system that do not produce harmonic but amplifies the existing in the electrical network. The most common of those elements is the capacitor, very used to compensate power factor at fundamental frequency. The capacitor behaviour makes that the indices proposed up now to identify distortion sources fail in the presence of this element. In this paper, a new index is presented: the load characterization index. Besides using an extended equivalent circuit to represent the load, this index calculates the distortion introduced by the load, evaluating, besides the current distortion at its input, the voltage distortion at its terminals. The introduction of voltage assessing makes the index suitable to identify the linear and nonlinear loads in the power system even in the presence of capacitors and only from the voltage and current measured at the point of common coupling.
{"title":"Distortion sources identification in power systems with capacitor banks","authors":"R. S. Herrera, P. Salmerón, S. P. Litrán","doi":"10.1109/POWERENG.2011.6036505","DOIUrl":"https://doi.org/10.1109/POWERENG.2011.6036505","url":null,"abstract":"The identification of distortion sources in a power system is a topic unsolved. The problem has a difficult solution because there are elements in the system that do not produce harmonic but amplifies the existing in the electrical network. The most common of those elements is the capacitor, very used to compensate power factor at fundamental frequency. The capacitor behaviour makes that the indices proposed up now to identify distortion sources fail in the presence of this element. In this paper, a new index is presented: the load characterization index. Besides using an extended equivalent circuit to represent the load, this index calculates the distortion introduced by the load, evaluating, besides the current distortion at its input, the voltage distortion at its terminals. The introduction of voltage assessing makes the index suitable to identify the linear and nonlinear loads in the power system even in the presence of capacitors and only from the voltage and current measured at the point of common coupling.","PeriodicalId":166144,"journal":{"name":"2011 International Conference on Power Engineering, Energy and Electrical Drives","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116124553","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：