Pub Date : 2003-11-17DOI: 10.1109/PEDS.2003.1282675
T. Ohbu, N. Tada, H. Sekiya, S. Saito, K. Hagiwara
The size of inverter equipment using conventional module type power devices becomes large in the consequence of large steady-state and transient thermal resistance by the following two reasons. (1) Because of the curvature of the base plate, contact thermal resistance of the conventional module type power device is relatively large, and steady-state thermal resistance also becomes large. (2) Since module type power devices are manufactured aiming at low cost and low steady-state thermal resistance, generally their heat capacity becomes small and their transient thermal resistance becomes large. We propose a new structure of a module type power device. The structure is that a semiconductor chip soldered on an electrode is united with a heat sink by using an epoxy resin. It is confirmed that the steady-state and the transient thermal resistance of the proposed module type power device is decreased to about 50% compared to conventional type.
{"title":"The module type power device united with a heat sink","authors":"T. Ohbu, N. Tada, H. Sekiya, S. Saito, K. Hagiwara","doi":"10.1109/PEDS.2003.1282675","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282675","url":null,"abstract":"The size of inverter equipment using conventional module type power devices becomes large in the consequence of large steady-state and transient thermal resistance by the following two reasons. (1) Because of the curvature of the base plate, contact thermal resistance of the conventional module type power device is relatively large, and steady-state thermal resistance also becomes large. (2) Since module type power devices are manufactured aiming at low cost and low steady-state thermal resistance, generally their heat capacity becomes small and their transient thermal resistance becomes large. We propose a new structure of a module type power device. The structure is that a semiconductor chip soldered on an electrode is united with a heat sink by using an epoxy resin. It is confirmed that the steady-state and the transient thermal resistance of the proposed module type power device is decreased to about 50% compared to conventional type.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129836310","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282998
L. Junqing, L. Heming, L. Zhiping
The heating process of stator end-region of synchronous generator on all kinds of operating conditions is analyzed. With the phasor diagram of the electric-magnetic potential in cylindrical rotor synchronous generators, the mathematical model of temperature of stator end region in synchronous generator is deduced. The relationship between the temperature of stator end region and the active power, reactive power and armature voltage is developed. The parameters of the temperature model are identified with the method of least squares. A new temperature-rise limit curve of stator end region is deduced, which is given in the P-Q operating chart of synchronous generator. The preciseness of the temperature model is validated with the experimental values of turbine generator. The model is also used to real-time monitor of the generator stator end region temperature.
{"title":"Research on temperature-rise of stator iron-core end region of turbine generator","authors":"L. Junqing, L. Heming, L. Zhiping","doi":"10.1109/PEDS.2003.1282998","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282998","url":null,"abstract":"The heating process of stator end-region of synchronous generator on all kinds of operating conditions is analyzed. With the phasor diagram of the electric-magnetic potential in cylindrical rotor synchronous generators, the mathematical model of temperature of stator end region in synchronous generator is deduced. The relationship between the temperature of stator end region and the active power, reactive power and armature voltage is developed. The parameters of the temperature model are identified with the method of least squares. A new temperature-rise limit curve of stator end region is deduced, which is given in the P-Q operating chart of synchronous generator. The preciseness of the temperature model is validated with the experimental values of turbine generator. The model is also used to real-time monitor of the generator stator end region temperature.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130318554","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1283203
V. Anunciada, H. Ribeiro
The full-bridge converter with isolation transformer is the preferred topology for medium and high power SMPS. A simple topology modification, i.e. the addition of two input inductors, and appropriate control methods permit to control simultaneously and accurately the output voltage and the input current, performing a new single stage SMPS. The circuit behaviour is strongly dependent on the output power level, as occurs with almost all single stage converters with power factor correction. In light load conditions, the voltage in the storage capacitor remains uncontrollable, even if an highly distorted input current is acceptable. This fact limits the use of those converters to some few applications where the ratio "nominal output power / minimum output power" is small, or when the converter can be switched off when the capacitor voltage is excessive. A different solution is presented in this paper, that consists in the addition of a static input switch, obtained by the replacement of two diodes in the input bridge rectifier by a pair of thyristors. Switching times are an integer number of periods and flickering is avoided by the use of a random control of the input switch.
{"title":"Single stage AC/DC converter with input power factor correction","authors":"V. Anunciada, H. Ribeiro","doi":"10.1109/PEDS.2003.1283203","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1283203","url":null,"abstract":"The full-bridge converter with isolation transformer is the preferred topology for medium and high power SMPS. A simple topology modification, i.e. the addition of two input inductors, and appropriate control methods permit to control simultaneously and accurately the output voltage and the input current, performing a new single stage SMPS. The circuit behaviour is strongly dependent on the output power level, as occurs with almost all single stage converters with power factor correction. In light load conditions, the voltage in the storage capacitor remains uncontrollable, even if an highly distorted input current is acceptable. This fact limits the use of those converters to some few applications where the ratio \"nominal output power / minimum output power\" is small, or when the converter can be switched off when the capacitor voltage is excessive. A different solution is presented in this paper, that consists in the addition of a static input switch, obtained by the replacement of two diodes in the input bridge rectifier by a pair of thyristors. Switching times are an integer number of periods and flickering is avoided by the use of a random control of the input switch.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126915073","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282838
V. Tarateeraseth, W. Khan-ngern
The improved electromagnetic interference (EMI) for single-stage single-switch AC/DC Power Factor Correction (S/sup 4/PFC) by ripple-steering technique is presented. The suitable coupled inductor design, which used for steering the ripple that applied for single-stage single-switch AC/DC power factor correction, is fulfilled to gain a significantly conducted EMI reduction. The performance of modified boost inductor is shown by the implemented and discussed. Finally, the comparison between "modified boost inductor" and conventional "LC" filter in the EMI point of view is verified and experimented.
{"title":"Reducing the electromagnetic interference for single-stage single-switch AC/DC power factor correction by ripple-steering technique","authors":"V. Tarateeraseth, W. Khan-ngern","doi":"10.1109/PEDS.2003.1282838","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282838","url":null,"abstract":"The improved electromagnetic interference (EMI) for single-stage single-switch AC/DC Power Factor Correction (S/sup 4/PFC) by ripple-steering technique is presented. The suitable coupled inductor design, which used for steering the ripple that applied for single-stage single-switch AC/DC power factor correction, is fulfilled to gain a significantly conducted EMI reduction. The performance of modified boost inductor is shown by the implemented and discussed. Finally, the comparison between \"modified boost inductor\" and conventional \"LC\" filter in the EMI point of view is verified and experimented.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114624697","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1283126
S. Nagai, A. Hirota, M. Nakaoka
This paper proposes an advanced delta-sigma modulated power factor correction (PFC) converter. The proposed circuit introduces pulse space modulation technique for a full bridge converter and can regulate input current as a sinusoidal wave together with high power factor operation. Also, because the proposed circuit has the feature of noise shaping characteristics, the circuit can reduce low frequency harmonics that are difficult to reduce by using conventional PWM modulation. Furthermore, introducing current limiting scheme, the proposed circuit can reduce switching device rating.
{"title":"Advanced full bridge type delta-sigma modulated pulse space modulation PFC converter introducing current limiting scheme","authors":"S. Nagai, A. Hirota, M. Nakaoka","doi":"10.1109/PEDS.2003.1283126","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1283126","url":null,"abstract":"This paper proposes an advanced delta-sigma modulated power factor correction (PFC) converter. The proposed circuit introduces pulse space modulation technique for a full bridge converter and can regulate input current as a sinusoidal wave together with high power factor operation. Also, because the proposed circuit has the feature of noise shaping characteristics, the circuit can reduce low frequency harmonics that are difficult to reduce by using conventional PWM modulation. Furthermore, introducing current limiting scheme, the proposed circuit can reduce switching device rating.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121713351","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282988
N. Urasaki, T. Senjyu, K. Uezato, T. Funabashi, H. Fujita
This paper presents a high efficiency drive strategy for the micro-turbine generator (MTG) in which the permanent magnet synchronous generator (PMSG) is employed. The PMSG operates with maximum efficiency by optimizing the decomposition of the dq-xes armature currents in the synchronous reference frame. In addition, in order to effectively use the turbine output power, compressor optimizing the revolving speed of the PMSG minimizes input power. Simulation results confirm the validity of the proposed method.
{"title":"High efficiency drive for micro-turbine generator based on current phase and revolving speed optimization","authors":"N. Urasaki, T. Senjyu, K. Uezato, T. Funabashi, H. Fujita","doi":"10.1109/PEDS.2003.1282988","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282988","url":null,"abstract":"This paper presents a high efficiency drive strategy for the micro-turbine generator (MTG) in which the permanent magnet synchronous generator (PMSG) is employed. The PMSG operates with maximum efficiency by optimizing the decomposition of the dq-xes armature currents in the synchronous reference frame. In addition, in order to effectively use the turbine output power, compressor optimizing the revolving speed of the PMSG minimizes input power. Simulation results confirm the validity of the proposed method.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115791472","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282756
R. Kennel, A. El-refaei, F. Elkady, S. Mahmoud, E. Elkholy
Direct torque control (DTC) schemes can produce quick and robust responses, but they usually behave like hysteresis controllers. Consequently there are similar problems like non constant switching frequencies and high torque ripple especially when operation conditions result in low switching frequencies. In this paper, the basic concept of DTC will be improved by modifying the classical method. Problems which arising when using standard DTC methods are explained and improvements are derived to overcome these problems. Two theoretical approaches are verified and compared with standard DTC by measurements and experiments. The proposed methods provide a constant switching frequency and solve the starting problem without dither signal. Further results are a reduction of torque pulsations as well as a new method for stator flux estimation.
{"title":"Torque ripple minimization for induction motor drives with direct torque control (DTC)","authors":"R. Kennel, A. El-refaei, F. Elkady, S. Mahmoud, E. Elkholy","doi":"10.1109/PEDS.2003.1282756","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282756","url":null,"abstract":"Direct torque control (DTC) schemes can produce quick and robust responses, but they usually behave like hysteresis controllers. Consequently there are similar problems like non constant switching frequencies and high torque ripple especially when operation conditions result in low switching frequencies. In this paper, the basic concept of DTC will be improved by modifying the classical method. Problems which arising when using standard DTC methods are explained and improvements are derived to overcome these problems. Two theoretical approaches are verified and compared with standard DTC by measurements and experiments. The proposed methods provide a constant switching frequency and solve the starting problem without dither signal. Further results are a reduction of torque pulsations as well as a new method for stator flux estimation.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115846315","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1283150
S. Ichikawa, M. Tomita, S. Doki, S. Okuma
In this paper, we discuss a mathematical model that accounts for magnetic saturation in synchronous reluctance motors and we derive a novel mathematical model called extended EMF. In synchronous reluctance motors, since large currents cause magnetic saturation, it is necessary for a precise sensorless control to give it every consideration. We propose here the extended EMF model, which accounts for magnetic saturation, and we apply it to an estimation position method. We also discuss the d-axis directions of a motor model and determine an appropriate d-axis direction for the sensorless control. The experimental results verified that position estimations differ because of differences between the two d-axis directions. The results also demonstrate the success of the proposed sensor-less control based on the extended EMF model.
{"title":"Novel model of synchronous reluctance motors including magnetic saturation and its sensorless control","authors":"S. Ichikawa, M. Tomita, S. Doki, S. Okuma","doi":"10.1109/PEDS.2003.1283150","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1283150","url":null,"abstract":"In this paper, we discuss a mathematical model that accounts for magnetic saturation in synchronous reluctance motors and we derive a novel mathematical model called extended EMF. In synchronous reluctance motors, since large currents cause magnetic saturation, it is necessary for a precise sensorless control to give it every consideration. We propose here the extended EMF model, which accounts for magnetic saturation, and we apply it to an estimation position method. We also discuss the d-axis directions of a motor model and determine an appropriate d-axis direction for the sensorless control. The experimental results verified that position estimations differ because of differences between the two d-axis directions. The results also demonstrate the success of the proposed sensor-less control based on the extended EMF model.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131953248","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282982
Yu Shitao, Yan Xiangwu, Liu Shuyong, L. Heming, L. Junqing
The most significant difference between the ac-exited generator and the traditional synchronous generator is the adjustable speed. A detail analysis of the static state stability of the ac-excited generator is present. The stability of the ac-excited generator is limit not only by the static state stability limit as synchronous machine but also by the breakdown torque as asynchronous machine. The relation between static state stability limits and rotor speed is derived from the mathematic model, thereby the law of static state stability at any speed is presented and these have been tested by dynamic physical simulative experiment.
{"title":"Static state stability analysis of AC-excited generators","authors":"Yu Shitao, Yan Xiangwu, Liu Shuyong, L. Heming, L. Junqing","doi":"10.1109/PEDS.2003.1282982","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282982","url":null,"abstract":"The most significant difference between the ac-exited generator and the traditional synchronous generator is the adjustable speed. A detail analysis of the static state stability of the ac-excited generator is present. The stability of the ac-excited generator is limit not only by the static state stability limit as synchronous machine but also by the breakdown torque as asynchronous machine. The relation between static state stability limits and rotor speed is derived from the mathematic model, thereby the law of static state stability at any speed is presented and these have been tested by dynamic physical simulative experiment.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131646006","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 : 2003-11-17DOI: 10.1109/PEDS.2003.1282904
F. Luo, H. Ye
Electromagnetic interference generally exists in all electrical and electronic equipment, especially in all DC/DC converters. Since the switching frequency applied in DC/DC converters is high it causes significant EMI. This paper provides information to reduce EMI, and consequently achieve the reasonable electromagnetic susceptibility and electromagnetic compatibility.
{"title":"Investigation of EMI, EMS and EMC in power DC/DC converters","authors":"F. Luo, H. Ye","doi":"10.1109/PEDS.2003.1282904","DOIUrl":"https://doi.org/10.1109/PEDS.2003.1282904","url":null,"abstract":"Electromagnetic interference generally exists in all electrical and electronic equipment, especially in all DC/DC converters. Since the switching frequency applied in DC/DC converters is high it causes significant EMI. This paper provides information to reduce EMI, and consequently achieve the reasonable electromagnetic susceptibility and electromagnetic compatibility.","PeriodicalId":106054,"journal":{"name":"The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131811100","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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