Pub Date : 2008-12-16DOI: 10.1109/UPEC.2008.4651580
P. Alotto, M. Guarnieri, F. Moro
Hybrid power sources can combine the high power density of batteries with the high energy density of fuel cells, in order to improve runtime of portable electronic devices. In this work a non-linear coupled electro-chemical model for predicting the steady-state and dynamic performances of a micro fuel cell is presented. This model is implemented in Matlab/Simulinkreg in order to simulate a hybrid system (Li-ion cell+direct methanol fuel cell) under variable load and supply conditions.
{"title":"Modeling and control of fuel cell-battery hybrid power systems for portable electronics","authors":"P. Alotto, M. Guarnieri, F. Moro","doi":"10.1109/UPEC.2008.4651580","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651580","url":null,"abstract":"Hybrid power sources can combine the high power density of batteries with the high energy density of fuel cells, in order to improve runtime of portable electronic devices. In this work a non-linear coupled electro-chemical model for predicting the steady-state and dynamic performances of a micro fuel cell is presented. This model is implemented in Matlab/Simulinkreg in order to simulate a hybrid system (Li-ion cell+direct methanol fuel cell) under variable load and supply conditions.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132762781","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651676
M. Wong, C. Lam, N. Dai
The hybrid filter is a combination of a passive filter and a small-rated active filter, which gives a relatively economical approach comparing to a conventional active filter. The initial cost and the operation switching loss of the filter are proportional to the rating of the active filter. Different structures of passive filters in a hybrid filter have different required ratings of the active part of the hybrid filter. Based on the pervious researches, there are many different topologies of a hybrid filter. They can be mainly classified as: series-type, b-shape and parallel-type hybrid filters. In this paper, a comparison among different structure topologies of hybrid filters is performed. The guidelines are given for the selection of hybrid filter topologies. Computed and simulated results show out its validity of the discussion in this paper.
{"title":"Comparison of structure topologies for hybrid filters","authors":"M. Wong, C. Lam, N. Dai","doi":"10.1109/UPEC.2008.4651676","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651676","url":null,"abstract":"The hybrid filter is a combination of a passive filter and a small-rated active filter, which gives a relatively economical approach comparing to a conventional active filter. The initial cost and the operation switching loss of the filter are proportional to the rating of the active filter. Different structures of passive filters in a hybrid filter have different required ratings of the active part of the hybrid filter. Based on the pervious researches, there are many different topologies of a hybrid filter. They can be mainly classified as: series-type, b-shape and parallel-type hybrid filters. In this paper, a comparison among different structure topologies of hybrid filters is performed. The guidelines are given for the selection of hybrid filter topologies. Computed and simulated results show out its validity of the discussion in this paper.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134511001","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651451
Zhengqing Han, Shuping Liu, Shibin Gao, Z. Bo
This paper presents a novel detection criterion for transformer inrush. The current magnitudes calculated by one-cycle Fourier filter will not change or change little with time, no matter for inrush current or internal fault current, because the filter window length is just the same as the power cycle. However, the magnitudes of inrush current calculated by short-window filter algorithm have distinct difference from the magnitudes of internal fault. The inrush current magnitudes calculated by short-window filter algorithm will fluctuate significantly around the magnitudes calculated by one-cycle Fourier filter, but the internal fault current magnitudes calculated by short-window filter algorithm are close to those by one-cycle Fourier filter. Based on the magnitudes calculated by Fourier and short-window filter, a novel inrush detection criterion is presented. Extensive simulation results show that the presented criterion can correctly distinguish inrush current from internal current.
{"title":"A novel detection criterion for transformer inrush based on short-window filter algorithm","authors":"Zhengqing Han, Shuping Liu, Shibin Gao, Z. Bo","doi":"10.1109/UPEC.2008.4651451","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651451","url":null,"abstract":"This paper presents a novel detection criterion for transformer inrush. The current magnitudes calculated by one-cycle Fourier filter will not change or change little with time, no matter for inrush current or internal fault current, because the filter window length is just the same as the power cycle. However, the magnitudes of inrush current calculated by short-window filter algorithm have distinct difference from the magnitudes of internal fault. The inrush current magnitudes calculated by short-window filter algorithm will fluctuate significantly around the magnitudes calculated by one-cycle Fourier filter, but the internal fault current magnitudes calculated by short-window filter algorithm are close to those by one-cycle Fourier filter. Based on the magnitudes calculated by Fourier and short-window filter, a novel inrush detection criterion is presented. Extensive simulation results show that the presented criterion can correctly distinguish inrush current from internal current.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132897521","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651662
Abdulatif A. M. Shaban
A.C motors, in general, have superior performance characteristics to their d.c. counterparts. However, despite these advantage a.c. motors lack the controllability and simplicity and so d.c. motors retain a competitive edge where precise control is required. As part of an overall project to develop an improved cycloconverter control strategy for induction motors. Simulation and modelling techniques have been developed. This contribution describes a method used to simulate an induction motor drive using the SIMULINK toolbox within MATLAB software. The cycloconverter fed induction motor is principally modelled using the d-q axis equations. Results of the simulation for a given set of induction motor parameters are also presented.
{"title":"Modelling and simulation of variable frequency fed induction motors","authors":"Abdulatif A. M. Shaban","doi":"10.1109/UPEC.2008.4651662","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651662","url":null,"abstract":"A.C motors, in general, have superior performance characteristics to their d.c. counterparts. However, despite these advantage a.c. motors lack the controllability and simplicity and so d.c. motors retain a competitive edge where precise control is required. As part of an overall project to develop an improved cycloconverter control strategy for induction motors. Simulation and modelling techniques have been developed. This contribution describes a method used to simulate an induction motor drive using the SIMULINK toolbox within MATLAB software. The cycloconverter fed induction motor is principally modelled using the d-q axis equations. Results of the simulation for a given set of induction motor parameters are also presented.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133254064","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651562
M. Sarvi, M. Masoum
Ni-Cd batteries are nonlinear electrochemical devices with different characteristics at different charge currents. This paper proposes a neural network based method for simulation and modeling of Ni-Cd batteries that considers the impact of charge current. Simulations and measurements are performed for the RBF neural network and advantages and limitations of the model are presented. Inputs of the neural network are battery current ( Ibat ), no load voltage and time (t) while battery voltage ( Vbat ) is selected as the output. An experimental setup is used to validate the accuracy of the model at different charge rates. Computed and measured results show good agreements for a 7AH, size F, Ni-Cd battery, manufactured by SANYO. Theoretical and experimental results are compared and analyzed.
{"title":"A neural network model for Ni-Cd batteries","authors":"M. Sarvi, M. Masoum","doi":"10.1109/UPEC.2008.4651562","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651562","url":null,"abstract":"Ni-Cd batteries are nonlinear electrochemical devices with different characteristics at different charge currents. This paper proposes a neural network based method for simulation and modeling of Ni-Cd batteries that considers the impact of charge current. Simulations and measurements are performed for the RBF neural network and advantages and limitations of the model are presented. Inputs of the neural network are battery current ( Ibat ), no load voltage and time (t) while battery voltage ( Vbat ) is selected as the output. An experimental setup is used to validate the accuracy of the model at different charge rates. Computed and measured results show good agreements for a 7AH, size F, Ni-Cd battery, manufactured by SANYO. Theoretical and experimental results are compared and analyzed.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121942296","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651512
R. Mai, Z.Y. He, B. Kirby
Frequency of voltage signals in power system is a key parameter to reflect the operational state of the whole system. Therefore, a new algorithm is needed to attain a more accurate frequency estimation in both steady state and dynamic conditions, for high level application such as wide area control that let the power system operate in a healthy manner. A dynamic modulation signal model is proposed via Taylor expansion to approximate dynamic voltage signals. The Taylor expansionpsilas derivatives, expressed by consecutive phasors, are to characterize the dynamic behaviour and then be used to revise the phasorspsila estimations of the modulation signal. Revised phasors can be employed to calculate the frequency of the signal based on phasor based frequency measurement technique. Finally the frequency estimation at the report time can be acquired accurately by modifying the frequency using the frequency derivative. Theoretic analysis and simulation allow us to conclude that performance of the algorithm proposed in this paper is much better than traditional phasor-based frequency measurement techniques in dynamic conditions.
{"title":"A novel dynamic frequency estimation algorithm in power system","authors":"R. Mai, Z.Y. He, B. Kirby","doi":"10.1109/UPEC.2008.4651512","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651512","url":null,"abstract":"Frequency of voltage signals in power system is a key parameter to reflect the operational state of the whole system. Therefore, a new algorithm is needed to attain a more accurate frequency estimation in both steady state and dynamic conditions, for high level application such as wide area control that let the power system operate in a healthy manner. A dynamic modulation signal model is proposed via Taylor expansion to approximate dynamic voltage signals. The Taylor expansionpsilas derivatives, expressed by consecutive phasors, are to characterize the dynamic behaviour and then be used to revise the phasorspsila estimations of the modulation signal. Revised phasors can be employed to calculate the frequency of the signal based on phasor based frequency measurement technique. Finally the frequency estimation at the report time can be acquired accurately by modifying the frequency using the frequency derivative. Theoretic analysis and simulation allow us to conclude that performance of the algorithm proposed in this paper is much better than traditional phasor-based frequency measurement techniques in dynamic conditions.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122173732","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651656
A. Abdel-Khalik, M. Masoud, A. L. Mohamadein, B. Williams, M. Magdy
This paper presents the performance, steady state and stability analysis of mixed pole machine with a new mode of operation where n-phase electric power can be transferred to a load mounted on the rotor. This type of machine can be used in applications that require control of both rotor torque and rotor electric power, such as rotational antennas and turret systems. The performance includes machine torque, electric efficiency, mechanical efficiency, total efficiency and system stability. Experimentation using a prototype machine confirms the simulation results.
{"title":"Performance evaluation for mixed pole machines with electromechanical torque and rotor electric power and stability analysis","authors":"A. Abdel-Khalik, M. Masoud, A. L. Mohamadein, B. Williams, M. Magdy","doi":"10.1109/UPEC.2008.4651656","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651656","url":null,"abstract":"This paper presents the performance, steady state and stability analysis of mixed pole machine with a new mode of operation where n-phase electric power can be transferred to a load mounted on the rotor. This type of machine can be used in applications that require control of both rotor torque and rotor electric power, such as rotational antennas and turret systems. The performance includes machine torque, electric efficiency, mechanical efficiency, total efficiency and system stability. Experimentation using a prototype machine confirms the simulation results.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125892991","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651570
R. Brandao, J. Carvalho, F. Barbosa
All over the world, energy companies are investing in technologies to make better use of renewable energy to generate electric power. Wind energy is the renewable energy source that had a higher growing in the last decades and can be considered a hope in future based on clean and sustainable energy. The development of tools that allows operators and maintenance personnel to correlate machinery related information with other operational information such as machine speed, electrical load, and wind speed, are needed.
{"title":"Fault detection on wind generators","authors":"R. Brandao, J. Carvalho, F. Barbosa","doi":"10.1109/UPEC.2008.4651570","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651570","url":null,"abstract":"All over the world, energy companies are investing in technologies to make better use of renewable energy to generate electric power. Wind energy is the renewable energy source that had a higher growing in the last decades and can be considered a hope in future based on clean and sustainable energy. The development of tools that allows operators and maintenance personnel to correlate machinery related information with other operational information such as machine speed, electrical load, and wind speed, are needed.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123494917","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651437
M. Hurtgen, P. Praks, J. Maun, P. Zając
It is essential for Energy Management Systems (EMS) applications and control centre technologies that the measurements allow monitoring of the power system. An important tool for the EMS is state estimation which makes it possible to estimate the state variables of the power system based on these measurements. The measurements should allow observability of the power system which means they can be used to describe the system. The objective of the paper is to develop an algorithm for placement of PMUs in order to make the system observable. The novelty is that a limit on the number of measurements each PMU can make is introduced. The number of PMUs needed to make the network observable will therefore depend on the maximum number of measurements each PMU can make. The algorithm is tested on three IEEE test networks.
{"title":"Measurement placement algorithms for state estimation when the number of phasor measurements by each PMU is limited","authors":"M. Hurtgen, P. Praks, J. Maun, P. Zając","doi":"10.1109/UPEC.2008.4651437","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651437","url":null,"abstract":"It is essential for Energy Management Systems (EMS) applications and control centre technologies that the measurements allow monitoring of the power system. An important tool for the EMS is state estimation which makes it possible to estimate the state variables of the power system based on these measurements. The measurements should allow observability of the power system which means they can be used to describe the system. The objective of the paper is to develop an algorithm for placement of PMUs in order to make the system observable. The novelty is that a limit on the number of measurements each PMU can make is introduced. The number of PMUs needed to make the network observable will therefore depend on the maximum number of measurements each PMU can make. The algorithm is tested on three IEEE test networks.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122281251","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651643
L. Petkovska, Z. Kolondzovski, G. Cvetkovski
In the paper the full performance analysis of a salient poles synchronous generator (SPSG) is presented. The focus is put on the simulation of transient characteristics in the case of three-phase bolted short circuit at the generator terminals. The analysis is based on the combined solution of the magnetic field equations and the circuit equations of windings. The equations are elaborated by the finite element method (FEM) and the field solution is obtained by using of the time-stepping approach.
{"title":"FEM coupling for transient performance analysis of a salient poles synchronous generator","authors":"L. Petkovska, Z. Kolondzovski, G. Cvetkovski","doi":"10.1109/UPEC.2008.4651643","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651643","url":null,"abstract":"In the paper the full performance analysis of a salient poles synchronous generator (SPSG) is presented. The focus is put on the simulation of transient characteristics in the case of three-phase bolted short circuit at the generator terminals. The analysis is based on the combined solution of the magnetic field equations and the circuit equations of windings. The equations are elaborated by the finite element method (FEM) and the field solution is obtained by using of the time-stepping approach.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124657485","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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