Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792874
M. Rukonuzzaman, M. Nakaoka
Harmonic currents are significant and inevitable when power electronic installations are used in industry and telecommunication energy plants. In order to compensate the instantaneous harmonic current components by active power filtering technique, it is a prerequisite to estimate the magnitude and phase of each harmonic component in real time. In this paper, a promethean approach is proposed for the determination of magnitude and phase of each current harmonic component from the distorted line currents. This approach introduces an adaptive learning multi-layer backpropagation neural network which converges faster than simple back-propagation neural network. Unlike conventional methods of harmonic current determination, this method requires only half cycle of the distorted current waves. This method is four times faster than the conventional method and this makes the on-line determination of instantaneous harmonic components.
{"title":"Magnitude and phase determination of harmonic currents by adaptive learning back-propagation neural network","authors":"M. Rukonuzzaman, M. Nakaoka","doi":"10.1109/PEDS.1999.792874","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792874","url":null,"abstract":"Harmonic currents are significant and inevitable when power electronic installations are used in industry and telecommunication energy plants. In order to compensate the instantaneous harmonic current components by active power filtering technique, it is a prerequisite to estimate the magnitude and phase of each harmonic component in real time. In this paper, a promethean approach is proposed for the determination of magnitude and phase of each current harmonic component from the distorted line currents. This approach introduces an adaptive learning multi-layer backpropagation neural network which converges faster than simple back-propagation neural network. Unlike conventional methods of harmonic current determination, this method requires only half cycle of the distorted current waves. This method is four times faster than the conventional method and this makes the on-line determination of instantaneous harmonic components.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129141739","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 : 1999-07-27DOI: 10.1109/PEDS.1999.792804
T. Liang, Jiann-Fuh Chen, C. Chu, Kuen-Jyh Chen
In this paper, the unbalanced current in the 12-pulse phase control AC/DC converters was studied. The 12-pulse /spl Delta/-Y type AC/DC converter will keep a balanced voltage with 30/spl deg/ phase shifted at the low coupling coefficient condition, but an unbalanced current will be obtained in the 12-pulse autotransformer phase shift AC/DC converter at the low coupling coefficient condition. The theoretical phasor analysis of the unbalanced current was presented and a feedback controller was designed to overcome this problem. Finally, a 3 kW 12-pulse autotransformer phase shifted AC/DC converter was implemented to demonstrate the theoretical analysis.
{"title":"Analysis of 12 pulse phase control AC/DC converter","authors":"T. Liang, Jiann-Fuh Chen, C. Chu, Kuen-Jyh Chen","doi":"10.1109/PEDS.1999.792804","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792804","url":null,"abstract":"In this paper, the unbalanced current in the 12-pulse phase control AC/DC converters was studied. The 12-pulse /spl Delta/-Y type AC/DC converter will keep a balanced voltage with 30/spl deg/ phase shifted at the low coupling coefficient condition, but an unbalanced current will be obtained in the 12-pulse autotransformer phase shift AC/DC converter at the low coupling coefficient condition. The theoretical phasor analysis of the unbalanced current was presented and a feedback controller was designed to overcome this problem. Finally, a 3 kW 12-pulse autotransformer phase shifted AC/DC converter was implemented to demonstrate the theoretical analysis.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226510","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 : 1999-07-27DOI: 10.1109/PEDS.1999.794588
J.H. Alimeling, W. Hammer
In this paper a new toolbox, PLECS, for the fast simulation of power electronic circuits under Simulink is presented. This toolbox provides the means for modeling large power electronic systems containing both electrical circuits and controllers. The program is based on a state-space formulation for circuits that consist of linear elements (RLC), transformers, sources, meters and ideal switches. Diodes, thyristors, IGBTs and other nonlinear elements such as saturable inductors can be assembled by combining linear elements and switches. Thus, a piece-wise linear model is attained which leads to a stable and fast simulation. An attached benchmark simulation demonstrates the capability of PLECS.
{"title":"PLECS-piece-wise linear electrical circuit simulation for Simulink","authors":"J.H. Alimeling, W. Hammer","doi":"10.1109/PEDS.1999.794588","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794588","url":null,"abstract":"In this paper a new toolbox, PLECS, for the fast simulation of power electronic circuits under Simulink is presented. This toolbox provides the means for modeling large power electronic systems containing both electrical circuits and controllers. The program is based on a state-space formulation for circuits that consist of linear elements (RLC), transformers, sources, meters and ideal switches. Diodes, thyristors, IGBTs and other nonlinear elements such as saturable inductors can be assembled by combining linear elements and switches. Thus, a piece-wise linear model is attained which leads to a stable and fast simulation. An attached benchmark simulation demonstrates the capability of PLECS.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114528715","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 : 1999-07-27DOI: 10.1109/PEDS.1999.794540
C. Mei, S. Panda, J. Xu, K. Lim
An induction motor drive based on direct torque control (DTC) allows high dynamic performance to be obtained with a very simple hysteresis control scheme. In this paper, the problem of stator flux drooping at low speeds has been investigated. By rotating the original flux sectors defined for conventional DTC near the sector boundaries, it is possible to maintain stator flux within the prescribed hysteresis bands and therefore improve the stator flux in the machine as well as the harmonic contents of stator currents. Moreover, the use of the proposed scheme also results in a reduction of overall inverter switching frequency. The effectiveness of the proposed scheme is evaluated through simulation studies, and is also supported with experimental results obtained from a 1.5 kW induction motor driven in a laboratory environment.
{"title":"Direct torque control of induction motor-variable switching sectors","authors":"C. Mei, S. Panda, J. Xu, K. Lim","doi":"10.1109/PEDS.1999.794540","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794540","url":null,"abstract":"An induction motor drive based on direct torque control (DTC) allows high dynamic performance to be obtained with a very simple hysteresis control scheme. In this paper, the problem of stator flux drooping at low speeds has been investigated. By rotating the original flux sectors defined for conventional DTC near the sector boundaries, it is possible to maintain stator flux within the prescribed hysteresis bands and therefore improve the stator flux in the machine as well as the harmonic contents of stator currents. Moreover, the use of the proposed scheme also results in a reduction of overall inverter switching frequency. The effectiveness of the proposed scheme is evaluated through simulation studies, and is also supported with experimental results obtained from a 1.5 kW induction motor driven in a laboratory environment.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114647918","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 : 1999-07-27DOI: 10.1109/PEDS.1999.794548
S. Watanabe, P. Boyagoda, M. Nakaoka, H. Takano
This paper presents a two-paralleled PWM amplifier using switch-mode power current tracking technique in order to generate a gradient magnetic field in the magnetic resonance imaging (MRI) system. This circuit has 8-IGBTs at their inputs/outputs so as to realize further high-power density. A digital control scheme can minimize the current ripple and improve its control response in the gradient coils (GCs). It is proved that the proposed technique will highly enlarge the diagnostic target and improve the image quality of MRI.
{"title":"Analysis on a PWM power conversion amplifier with IGBT macro model to generate gradient magnetic fields in MRI systems","authors":"S. Watanabe, P. Boyagoda, M. Nakaoka, H. Takano","doi":"10.1109/PEDS.1999.794548","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794548","url":null,"abstract":"This paper presents a two-paralleled PWM amplifier using switch-mode power current tracking technique in order to generate a gradient magnetic field in the magnetic resonance imaging (MRI) system. This circuit has 8-IGBTs at their inputs/outputs so as to realize further high-power density. A digital control scheme can minimize the current ripple and improve its control response in the gradient coils (GCs). It is proved that the proposed technique will highly enlarge the diagnostic target and improve the image quality of MRI.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122906289","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 : 1999-07-27DOI: 10.1109/PEDS.1999.794600
Hyosung Kim, H. Akagi
This paper proposed the rotating p-q-r reference frames where one instantaneous active power p, and two instantaneous reactive powers q/sub q/, q/sub r/ were defined in 3-phase 4-wire systems. The three power components are linearly independent, so that compensating for the two instantaneous reactive powers leads to control the two components of the current space vector independently. With the theory, this paper shows that the neutral current of a 3-phase 4-wire system can be eliminated by only compensating for the instantaneous reactive power using no energy storage element. Simulation results verify the theory very well.
{"title":"The instantaneous power theory on the rotating p-q-r reference frames","authors":"Hyosung Kim, H. Akagi","doi":"10.1109/PEDS.1999.794600","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794600","url":null,"abstract":"This paper proposed the rotating p-q-r reference frames where one instantaneous active power p, and two instantaneous reactive powers q/sub q/, q/sub r/ were defined in 3-phase 4-wire systems. The three power components are linearly independent, so that compensating for the two instantaneous reactive powers leads to control the two components of the current space vector independently. With the theory, this paper shows that the neutral current of a 3-phase 4-wire system can be eliminated by only compensating for the instantaneous reactive power using no energy storage element. Simulation results verify the theory very well.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"85-86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117144385","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 : 1999-07-27DOI: 10.1109/PEDS.1999.792732
P. Dahono, Slamet Riyadi, Ahmad Mudawari, Y. Haroen
This paper presents an output ripple analysis of multiphase DC-DC power converters having an output LC filter. Analytical expressions for the output voltage ripple of two- and three-phase DC-DC power converters are derived. Influence of the coupling coefficient of the output filter inductor on the output ripple is investigated. Because the unique parameters of the LC filter cannot be determined solely based on the specified maximum output ripple, an additional criterion based on minimum energy storage is introduced. A comparative evaluation of single-phase, two-phase, and three-phase DC-DC power converters is presented. The validity of the proposed analysis method is verified by experimental results.
{"title":"Output ripple analysis of multiphase DC-DC converters","authors":"P. Dahono, Slamet Riyadi, Ahmad Mudawari, Y. Haroen","doi":"10.1109/PEDS.1999.792732","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792732","url":null,"abstract":"This paper presents an output ripple analysis of multiphase DC-DC power converters having an output LC filter. Analytical expressions for the output voltage ripple of two- and three-phase DC-DC power converters are derived. Influence of the coupling coefficient of the output filter inductor on the output ripple is investigated. Because the unique parameters of the LC filter cannot be determined solely based on the specified maximum output ripple, an additional criterion based on minimum energy storage is introduced. A comparative evaluation of single-phase, two-phase, and three-phase DC-DC power converters is presented. The validity of the proposed analysis method is verified by experimental results.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126350525","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 : 1999-07-27DOI: 10.1109/PEDS.1999.792848
Yang Yinfu, Liu Jingbo, Zhou Dangsheng
Impactive current overshoot is usually observed in SPWM inverter when impulsive loads are loaded. So far, several methods have been proposed to solve this problem, such as mean current feedback control or temporarily pulling down the voltage reference. Nevertheless, they both have shortcomings. This paper introduces a pulse by pulse current limiting (i.e. instantaneous drive pulse locking) technique which can substantially lessen the impact on SPWM inverter during all kinds of impulsive loading (even the short-circuit of the load). This technique has been used successfully in a 3.5 kW, 400 Hz single-phase full-bridge SPWM inverter. By the pulse by pulse current limiting technique, the successful loading of impulsive loads is ensured, and the loading process has little influence on the normal supply to other important loads which are powered by the inverter at the same time.
{"title":"Pulse by pulse current limiting technique for SPWM inverters","authors":"Yang Yinfu, Liu Jingbo, Zhou Dangsheng","doi":"10.1109/PEDS.1999.792848","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792848","url":null,"abstract":"Impactive current overshoot is usually observed in SPWM inverter when impulsive loads are loaded. So far, several methods have been proposed to solve this problem, such as mean current feedback control or temporarily pulling down the voltage reference. Nevertheless, they both have shortcomings. This paper introduces a pulse by pulse current limiting (i.e. instantaneous drive pulse locking) technique which can substantially lessen the impact on SPWM inverter during all kinds of impulsive loading (even the short-circuit of the load). This technique has been used successfully in a 3.5 kW, 400 Hz single-phase full-bridge SPWM inverter. By the pulse by pulse current limiting technique, the successful loading of impulsive loads is ensured, and the loading process has little influence on the normal supply to other important loads which are powered by the inverter at the same time.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129081885","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 : 1999-07-27DOI: 10.1109/PEDS.1999.792825
A.Y.K. Wong, D. Cheng, Y. Lee
This paper studies a single phase shunt active power filter (APF) using a bi-directional full-bridge converter with capacitive energy storage to compensate for the harmonics generated by nonlinear loads. The usage of a capacitor as a reactive power source for the APF simplifies the circuitry. The harmonic current reference is obtained by feeding the load current signal into a 50 Hz notch filter. The simple and fast hysteresis control strategy involving only a few analog and logic components makes it attractive for the low power domestic application. The usefulness of the proposed control algorithm is confirmed by simulation as well as by experimental results.
{"title":"Harmonic compensation for nonlinear loads by active power","authors":"A.Y.K. Wong, D. Cheng, Y. Lee","doi":"10.1109/PEDS.1999.792825","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792825","url":null,"abstract":"This paper studies a single phase shunt active power filter (APF) using a bi-directional full-bridge converter with capacitive energy storage to compensate for the harmonics generated by nonlinear loads. The usage of a capacitor as a reactive power source for the APF simplifies the circuitry. The harmonic current reference is obtained by feeding the load current signal into a 50 Hz notch filter. The simple and fast hysteresis control strategy involving only a few analog and logic components makes it attractive for the low power domestic application. The usefulness of the proposed control algorithm is confirmed by simulation as well as by experimental results.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124068183","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 : 1999-07-27DOI: 10.1109/PEDS.1999.794531
H. Iwamoto, H. Takahashi, M. Tabata, K. Satoh
A new PT-type trench gate IGBT has been developed using a local lifetime control in the n+ buffer layer. A prototype was developed after analyzing the device and estimating its characteristics using simulation. Both the result of simulation and that of measurement of the prototype have matched. Though the chip area is about 40/spl sim/50% smaller than the conventional IGBT, the newly developed IGBT's on-state voltage is about two-thirds (1.8 V, typically), its switching loss is about 80%, and has a larger reverse bias switching withstand capability. Also, a high-speed diode with excellent soft recovery characteristic was developed using local lifetime control in anode-side n-layer. As a result, a reduction of surge voltage, noise, and switching power loss has been achieved. This paper presents the structures and characteristics of the new IGBT and diode and their analysis results.
{"title":"New 1200 V power modules with sophisticated trench gate IGBT and superior soft recovery diode","authors":"H. Iwamoto, H. Takahashi, M. Tabata, K. Satoh","doi":"10.1109/PEDS.1999.794531","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794531","url":null,"abstract":"A new PT-type trench gate IGBT has been developed using a local lifetime control in the n+ buffer layer. A prototype was developed after analyzing the device and estimating its characteristics using simulation. Both the result of simulation and that of measurement of the prototype have matched. Though the chip area is about 40/spl sim/50% smaller than the conventional IGBT, the newly developed IGBT's on-state voltage is about two-thirds (1.8 V, typically), its switching loss is about 80%, and has a larger reverse bias switching withstand capability. Also, a high-speed diode with excellent soft recovery characteristic was developed using local lifetime control in anode-side n-layer. As a result, a reduction of surge voltage, noise, and switching power loss has been achieved. This paper presents the structures and characteristics of the new IGBT and diode and their analysis results.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125837589","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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