Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487699
P. Randewijk, M. Kamper, R.-J. Wang
In this paper two different concentrated coil configurations for radial flux air-cored permanent magnet (RFAPM) machines are analysed and evaluated against a RFAPM machine that utilises overlapping coils. The comparative analysis of the different machines are done analytically. The analytical results are compared with finite element analysis results of simplified linearised equivalent models for the different coil configurations. The finite element analysis results correlate well with the analytical results in predicting a higher torque factor for small diameter, short stack RFAPM machines with concentrated coil configurations than for machines with overlapping coil configurations, with the same coil side-width values.
{"title":"Analysis and Performance Evaluation of Radial Flux Air-Cored Permanent Magnet Machines with Concentrated Coils","authors":"P. Randewijk, M. Kamper, R.-J. Wang","doi":"10.1109/PEDS.2007.4487699","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487699","url":null,"abstract":"In this paper two different concentrated coil configurations for radial flux air-cored permanent magnet (RFAPM) machines are analysed and evaluated against a RFAPM machine that utilises overlapping coils. The comparative analysis of the different machines are done analytically. The analytical results are compared with finite element analysis results of simplified linearised equivalent models for the different coil configurations. The finite element analysis results correlate well with the analytical results in predicting a higher torque factor for small diameter, short stack RFAPM machines with concentrated coil configurations than for machines with overlapping coil configurations, with the same coil side-width values.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"259 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127542399","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487864
Min Lin, T. Nabeshima, T. Sato, K. Nishijima
A new control method using a hysteretic PWM controller for all types of converters and its proper design method are presented. The triangular voltage obtained from a simple RC network connected between comparator output and converter output is superimposed to the output voltage and as a feedback signal to a hysteretic comparator. Since the hysteretic PWM controller essentially has derivative characteristics and has no error amplifier, the presented method provides no steady-state error voltage on the output and excellent dynamic performances for the load current transient by choosing proper values of time constants in the RC network. Performances of the proposed controller are experimentally verified for the buck, buck-boost and boost converters.
{"title":"Design of a New Hysteretic PWM Controller for All Types of DC-to-DC Converters","authors":"Min Lin, T. Nabeshima, T. Sato, K. Nishijima","doi":"10.1109/PEDS.2007.4487864","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487864","url":null,"abstract":"A new control method using a hysteretic PWM controller for all types of converters and its proper design method are presented. The triangular voltage obtained from a simple RC network connected between comparator output and converter output is superimposed to the output voltage and as a feedback signal to a hysteretic comparator. Since the hysteretic PWM controller essentially has derivative characteristics and has no error amplifier, the presented method provides no steady-state error voltage on the output and excellent dynamic performances for the load current transient by choosing proper values of time constants in the RC network. Performances of the proposed controller are experimentally verified for the buck, buck-boost and boost converters.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129153803","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487683
Andreas Koenig, T. Plum, Peter Fidler, R. D. Doncker
To operate power electronic devices at high ambient temperatures it has to be ensured that the maximum specified junction temperature is not exceeded at any time during operation. This paper presents a method to calculate the actual junction temperature by measuring voltage and current at a power MOSFET during operation of a converter. Based on this temperature, the actual transferred power of a converter can be controlled to ensure a safe operation within the specified temperature limits.
{"title":"On-line Junction Temperature Measurement of CoolMOS Devices","authors":"Andreas Koenig, T. Plum, Peter Fidler, R. D. Doncker","doi":"10.1109/PEDS.2007.4487683","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487683","url":null,"abstract":"To operate power electronic devices at high ambient temperatures it has to be ensured that the maximum specified junction temperature is not exceeded at any time during operation. This paper presents a method to calculate the actual junction temperature by measuring voltage and current at a power MOSFET during operation of a converter. Based on this temperature, the actual transferred power of a converter can be controlled to ensure a safe operation within the specified temperature limits.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130893219","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487715
D. Sakulhirirak, V. Tarateeraseth, W. Khan-ngern, N. Yoothanom
This paper proposes how to analyze and design the line impedance stabilization network (LISN). The details are described component characteristics and how to design air coil inductors in single and multi layers based on a high self resonant frequency response concept. According to the CISPR 16-1 standard, the stabilized impedance 50 Omega of LISN at frequency range 150 kHz to 30 MHz is proved by simulation and experimental results. The proposed LISN is successful design the low cost by compare with commercial LISN. Finally, the performance of the proposed LISN is achieved comparing to CISPR standard and also with commercial LISN.
{"title":"Design of High Performance and Low Cost Line Impedance Stabilization Network for University Power Electronics and EMC Laboratories","authors":"D. Sakulhirirak, V. Tarateeraseth, W. Khan-ngern, N. Yoothanom","doi":"10.1109/PEDS.2007.4487715","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487715","url":null,"abstract":"This paper proposes how to analyze and design the line impedance stabilization network (LISN). The details are described component characteristics and how to design air coil inductors in single and multi layers based on a high self resonant frequency response concept. According to the CISPR 16-1 standard, the stabilized impedance 50 Omega of LISN at frequency range 150 kHz to 30 MHz is proved by simulation and experimental results. The proposed LISN is successful design the low cost by compare with commercial LISN. Finally, the performance of the proposed LISN is achieved comparing to CISPR standard and also with commercial LISN.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116849085","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487851
T. Wolbank, M. Vogelsberger, R. Stumberger
Speed sensorless control of AC machines at zero speed so far is only possible using signal injection methods. Especially when applied to induction machines spatial saturation leads to a heavy dependence of the control signals on the flux/load level. This dependence has to be identified on a special test stand during a commissioning procedure. To avoid the usage of a speed sensor as well as load dynamometer coupled during the commissioning an adaptive flux model is proposed that delivers an accurate reference flux angle. After the commissioning this adaptive flux model is used in combination with the signal injection method to deliver the spatial flux position.
{"title":"Adaptive Flux model for commissioning of signal injection based zero speed sensorless flux control of induction machines","authors":"T. Wolbank, M. Vogelsberger, R. Stumberger","doi":"10.1109/PEDS.2007.4487851","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487851","url":null,"abstract":"Speed sensorless control of AC machines at zero speed so far is only possible using signal injection methods. Especially when applied to induction machines spatial saturation leads to a heavy dependence of the control signals on the flux/load level. This dependence has to be identified on a special test stand during a commissioning procedure. To avoid the usage of a speed sensor as well as load dynamometer coupled during the commissioning an adaptive flux model is proposed that delivers an accurate reference flux angle. After the commissioning this adaptive flux model is used in combination with the signal injection method to deliver the spatial flux position.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131450481","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487694
Yuang-Shung Lee, Yi-Pin Ko, Chien-An Chi
The proposed quasi-resonant (QR) zero current switching (ZCS) switched-capacitor (SC) converter is a new type of bi-directional power flow control conversion scheme. They are able to provide the voltage conversion ratios from 2 versus 1/2 (double-mode/half-mode) to n versus 1/n (n-mode/1/n-mode) by adding a different number of switched-capacitors and power MOSFET switches with a small series connected resonant inductor for forward and reverse schemes. The low current stress and balance resonance current are the advantage of the proposed quasi resonant switched-capacitor converter. The principle of operation, theoretical analysis of the proposed bi-directional power conversion scheme is described in detail with circuit model analysis. Simulation and experimental results are carried out to verify the performance of the new type ZCS SC bi-directional QR converters.
{"title":"A Novel QR ZCS Switched-Capacitor Bidirectional Converter","authors":"Yuang-Shung Lee, Yi-Pin Ko, Chien-An Chi","doi":"10.1109/PEDS.2007.4487694","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487694","url":null,"abstract":"The proposed quasi-resonant (QR) zero current switching (ZCS) switched-capacitor (SC) converter is a new type of bi-directional power flow control conversion scheme. They are able to provide the voltage conversion ratios from 2 versus 1/2 (double-mode/half-mode) to n versus 1/n (n-mode/1/n-mode) by adding a different number of switched-capacitors and power MOSFET switches with a small series connected resonant inductor for forward and reverse schemes. The low current stress and balance resonance current are the advantage of the proposed quasi resonant switched-capacitor converter. The principle of operation, theoretical analysis of the proposed bi-directional power conversion scheme is described in detail with circuit model analysis. Simulation and experimental results are carried out to verify the performance of the new type ZCS SC bi-directional QR converters.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131656652","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487743
N. Yongyuth, P. Viriya, K. Matsuse
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS switching conditions in a high-frequency full-bridge inverter for induction heating, using the principle of asymmetrical phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power Po, dc input power Pd, and hence the conversion efficiency Tj of the full-bridge inverter. The analysis results shows that the control ranges of ac output power Po and dc input power Pd are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency fs .
{"title":"Analysis of a Full-Bridge Inverter for Induction Heating Using Asymmetrical Phase-Shift Control under ZVS and NON-ZVS Operation","authors":"N. Yongyuth, P. Viriya, K. Matsuse","doi":"10.1109/PEDS.2007.4487743","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487743","url":null,"abstract":"This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS switching conditions in a high-frequency full-bridge inverter for induction heating, using the principle of asymmetrical phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power Po, dc input power Pd, and hence the conversion efficiency Tj of the full-bridge inverter. The analysis results shows that the control ranges of ac output power Po and dc input power Pd are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency fs .","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131839130","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487758
T. Manmek, C. Mudannayake
This paper presents the application of the proposed efficient least squares algorithm in power supply voltage dip and unbalance detection for mitigation using a D-STATCOM. The proposed method is capable of identifying the instantaneous symmetrical components of the fundamental frequency accurately even though the point of common coupling voltage is strongly corrupted by the voltage harmonics. Also, it fulfils the specific requirements of the fast transient response, accuracy and robustness in order to ensure the satisfactory performance of the mitigation system. The proposed method extracts detecting the positive- and negative-sequence components and then using those sequence components for generating reference values of current that need to be injected into the point of connection D-STATCOM in order to compensate the voltage errors. Furthermore, the suitability of the proposed method in balanced/unbalance voltage dip compensation is verified by a experimental studies.
{"title":"Real-Time Implementation of Voltage Dip Mitigation using D-STATCOM with Fast Extraction of Instantaneous Symmetrical Components","authors":"T. Manmek, C. Mudannayake","doi":"10.1109/PEDS.2007.4487758","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487758","url":null,"abstract":"This paper presents the application of the proposed efficient least squares algorithm in power supply voltage dip and unbalance detection for mitigation using a D-STATCOM. The proposed method is capable of identifying the instantaneous symmetrical components of the fundamental frequency accurately even though the point of common coupling voltage is strongly corrupted by the voltage harmonics. Also, it fulfils the specific requirements of the fast transient response, accuracy and robustness in order to ensure the satisfactory performance of the mitigation system. The proposed method extracts detecting the positive- and negative-sequence components and then using those sequence components for generating reference values of current that need to be injected into the point of connection D-STATCOM in order to compensate the voltage errors. Furthermore, the suitability of the proposed method in balanced/unbalance voltage dip compensation is verified by a experimental studies.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133285044","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487750
T. Zoller, T. Leibfried, A. Miri
Torsional vibrations occur in mechanical shafts whenever they couple rotating masses. Especially shaft assemblies with large inertias and long shafts, e.g. in turbo- generating sets of power plants or in drives, these oscillations can be a major problem due to the weak natural damping and the sharp resonance points of these systems. It is impossible to obtain a desirable damping of these torsional vibrations by means of a mechanical method. However, by using a power electronics converter and an inductive or capacitive energy storage, an electrical method can be used to implement an active damping. The following paper illustrates the needed configuration and the necessary controls of the required converters for damping torsional vibrations.
{"title":"Application of Power Electronics for Damping of Torsional Vibrations","authors":"T. Zoller, T. Leibfried, A. Miri","doi":"10.1109/PEDS.2007.4487750","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487750","url":null,"abstract":"Torsional vibrations occur in mechanical shafts whenever they couple rotating masses. Especially shaft assemblies with large inertias and long shafts, e.g. in turbo- generating sets of power plants or in drives, these oscillations can be a major problem due to the weak natural damping and the sharp resonance points of these systems. It is impossible to obtain a desirable damping of these torsional vibrations by means of a mechanical method. However, by using a power electronics converter and an inductive or capacitive energy storage, an electrical method can be used to implement an active damping. The following paper illustrates the needed configuration and the necessary controls of the required converters for damping torsional vibrations.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"547 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133465312","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 : 2007-11-01DOI: 10.1109/PEDS.2007.4487786
Dong Lei, W. Lijie, Huan Shi, Gao Shuang, Liao Xiaozhong
The development of wind generation has rapidly progressed over the last decade, but it must be integrated into power grids and electric utility systems. However, it cannot be dispatched like conventional generators because the power generated by the wind changes rapidly because of the continuous fluctuation of wind speed and direction. So it is very important to predict the wind power generation. This paper discusses why the wind power generation can be predicted in short-term, and how to setup the construction of an ANN (artificial neural network) prediction model of wind power based on chaotic time series. The analysis of modeling with low dimensions nonlinear dynamics indicates that time series of wind power generation have chaotic characteristics, and wind power can be predicted in short-term. Phase space reconstruction method can be used for ANN model design. The data from the wind farm located in the Saihanba China are used for this study.
{"title":"Prediction of Wind Power Generation based on Chaotic Phase Space Reconstruction Models","authors":"Dong Lei, W. Lijie, Huan Shi, Gao Shuang, Liao Xiaozhong","doi":"10.1109/PEDS.2007.4487786","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487786","url":null,"abstract":"The development of wind generation has rapidly progressed over the last decade, but it must be integrated into power grids and electric utility systems. However, it cannot be dispatched like conventional generators because the power generated by the wind changes rapidly because of the continuous fluctuation of wind speed and direction. So it is very important to predict the wind power generation. This paper discusses why the wind power generation can be predicted in short-term, and how to setup the construction of an ANN (artificial neural network) prediction model of wind power based on chaotic time series. The analysis of modeling with low dimensions nonlinear dynamics indicates that time series of wind power generation have chaotic characteristics, and wind power can be predicted in short-term. Phase space reconstruction method can be used for ANN model design. The data from the wind farm located in the Saihanba China are used for this study.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127635237","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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