M. Ohshima, F. Nakamura, S. Tamai, Y. Yamamoto, H. Mori
Along with wide and deep penetration of electronics application into our modern society, voltage dips and momentary interruptions, mainly due to lightning and snow damage on overhead transmission lines, have become a disturbance to normal operation of loads. A UPS, which is mostly employed to protect sensitive loads from disturbances, has such limitations that it dissipates no less energy in running operation because currents flow through two converters in series, it is poor in feeding electric motors which occupy the main loads in industrial plants and that its costs are high to be commonly applied. UPS can be regarded not as omnipotent against voltage dips and short interruptions. We have developed a novel power apparatus termed QBS (quick backup system) to supplement the above drawbacks in UPS, employing one reversible AC/DC converter and one high-speed switch. Normally QBS supplies power directly from a commercial network to critical loads while the reversible converter interconnects with it to charge the battery. When the critical bus voltage deviates from the tolerance range QBS disconnects the high-speed switch and continues to feed the critical loads in UPS mode. The whole power transition is completed within 2 ms. QBS of several thousands kVA has already been put to commercial use in telecommunication centers, electronics manufacturers and others.
{"title":"Development of a novel power apparatus to make up for voltage dips and interruptions based on quick reversible operation of a PWM converter","authors":"M. Ohshima, F. Nakamura, S. Tamai, Y. Yamamoto, H. Mori","doi":"10.1109/PCC.2002.997558","DOIUrl":"https://doi.org/10.1109/PCC.2002.997558","url":null,"abstract":"Along with wide and deep penetration of electronics application into our modern society, voltage dips and momentary interruptions, mainly due to lightning and snow damage on overhead transmission lines, have become a disturbance to normal operation of loads. A UPS, which is mostly employed to protect sensitive loads from disturbances, has such limitations that it dissipates no less energy in running operation because currents flow through two converters in series, it is poor in feeding electric motors which occupy the main loads in industrial plants and that its costs are high to be commonly applied. UPS can be regarded not as omnipotent against voltage dips and short interruptions. We have developed a novel power apparatus termed QBS (quick backup system) to supplement the above drawbacks in UPS, employing one reversible AC/DC converter and one high-speed switch. Normally QBS supplies power directly from a commercial network to critical loads while the reversible converter interconnects with it to charge the battery. When the critical bus voltage deviates from the tolerance range QBS disconnects the high-speed switch and continues to feed the critical loads in UPS mode. The whole power transition is completed within 2 ms. QBS of several thousands kVA has already been put to commercial use in telecommunication centers, electronics manufacturers and others.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123007396","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}
R. Masaki, S. Kaneko, Mitsuyulu Hombu, Takefumi Sawada, S. Yoshihara
This paper presents a new position sensorless control system of an interior permanent magnet synchronous motor (IPMSM) for electric vehicles. The proposed control system is based on an injected voltage vector that is synchronized with a PWM carrier of an inverter. The pole position is estimated from the relation between the injected voltage vector and the saliency of the rotor. The first current difference vector is detected when the injected voltage vector in the estimated pole position direction is added to the motor control voltage vector. Next, the second current difference vector is detected when the injected voltage vector in the opposite direction of the estimated pole position is added to the same motor control voltage vector. Then, the pole position of the rotor with anti-saliency can be estimated from the first and second current difference vectors. This control needs neither motor parameters nor band pass filters. The anti-salient pole type IPMSM can be operated over a wide speed range including zero speed, with a quick response. Good driving of electric vehicles is realized using the proposed system.
{"title":"Development of a position sensorless control system on an electric vehicle driven by a permanent magnet synchronous motor","authors":"R. Masaki, S. Kaneko, Mitsuyulu Hombu, Takefumi Sawada, S. Yoshihara","doi":"10.1109/PCC.2002.997580","DOIUrl":"https://doi.org/10.1109/PCC.2002.997580","url":null,"abstract":"This paper presents a new position sensorless control system of an interior permanent magnet synchronous motor (IPMSM) for electric vehicles. The proposed control system is based on an injected voltage vector that is synchronized with a PWM carrier of an inverter. The pole position is estimated from the relation between the injected voltage vector and the saliency of the rotor. The first current difference vector is detected when the injected voltage vector in the estimated pole position direction is added to the motor control voltage vector. Next, the second current difference vector is detected when the injected voltage vector in the opposite direction of the estimated pole position is added to the same motor control voltage vector. Then, the pole position of the rotor with anti-saliency can be estimated from the first and second current difference vectors. This control needs neither motor parameters nor band pass filters. The anti-salient pole type IPMSM can be operated over a wide speed range including zero speed, with a quick response. Good driving of electric vehicles is realized using the proposed system.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131493906","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}
Guo Jianjun, X. Dianguo, Liu Hankui, Gong Maozhong
This paper deals with unified power quality conditioner (UPQC), which aims at the integration of series-active and shunt-active power filters. The main purpose of a UPQC is to compensate for voltage imbalance, reactive power, negative-sequence current and harmonics. This paper discusses the compensation principle and control strategy of the UPQC in detail. Experimental results obtained from a laboratory prototype of 20 kVA are shown to verify the viability and effectiveness of the UPQC.
{"title":"Unified power quality conditioner (UPQC): the principle, control and application","authors":"Guo Jianjun, X. Dianguo, Liu Hankui, Gong Maozhong","doi":"10.1109/PCC.2002.998518","DOIUrl":"https://doi.org/10.1109/PCC.2002.998518","url":null,"abstract":"This paper deals with unified power quality conditioner (UPQC), which aims at the integration of series-active and shunt-active power filters. The main purpose of a UPQC is to compensate for voltage imbalance, reactive power, negative-sequence current and harmonics. This paper discusses the compensation principle and control strategy of the UPQC in detail. Experimental results obtained from a laboratory prototype of 20 kVA are shown to verify the viability and effectiveness of the UPQC.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132669001","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}
C. Y. Inaba, S. Sato, S. Nagai, E. Hiraki, M. Nakaoka
In this paper, a high frequency transformer-assisted auxiliary active resonant commutated snubber (HFTA-ARCS) for voltage source power conversion is presented. A three phase voltage source type soft switching inverter incorporating HFTA-ARCS circuits in its three bridge legs can reduce current rating of auxiliary active power switches and simplified sensorless control scheme without specified boost current management required for soft switching. Its operating principle and digital control scheme are described and a practical design procedure of circuit parameters on this HFTA-ARCS circuit is also introduced on the basis of computer simulation results. The effectiveness of this inverter is proved on the basis of performance evaluations and is also compared with the conventional three-phase hard switching inverter under the conditions of specified parameters.
{"title":"Space voltage vector modulated three phase inverter using auxiliary pulse current transformer-assisted resonant snubbers","authors":"C. Y. Inaba, S. Sato, S. Nagai, E. Hiraki, M. Nakaoka","doi":"10.1109/PCC.2002.998143","DOIUrl":"https://doi.org/10.1109/PCC.2002.998143","url":null,"abstract":"In this paper, a high frequency transformer-assisted auxiliary active resonant commutated snubber (HFTA-ARCS) for voltage source power conversion is presented. A three phase voltage source type soft switching inverter incorporating HFTA-ARCS circuits in its three bridge legs can reduce current rating of auxiliary active power switches and simplified sensorless control scheme without specified boost current management required for soft switching. Its operating principle and digital control scheme are described and a practical design procedure of circuit parameters on this HFTA-ARCS circuit is also introduced on the basis of computer simulation results. The effectiveness of this inverter is proved on the basis of performance evaluations and is also compared with the conventional three-phase hard switching inverter under the conditions of specified parameters.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132806759","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}
This paper presents a performance analysis in steady-state of a novel type auxiliary resonant commutation snubber-linked 3-level 3-phase voltage source type soft switching inverter suitable and acceptable for high-power applications in comparison with resonant DC linked 3-level 3-phase voltage source type soft switching inverter proposed previously which can operate under a condition of zero voltage switching (ZVS). The digital control scheme of this inverter is presented. The steady-state performances of this inverter are illustrated and evaluated on the basis of the simulation results.
{"title":"Auxiliary active resonant commutated snubber-assisted 3-level 3-phase voltage source soft-switching inverter","authors":"M. Yamamoto, S. Sato, E. Hiraki, M. Nakaoka","doi":"10.1109/PCC.2002.998151","DOIUrl":"https://doi.org/10.1109/PCC.2002.998151","url":null,"abstract":"This paper presents a performance analysis in steady-state of a novel type auxiliary resonant commutation snubber-linked 3-level 3-phase voltage source type soft switching inverter suitable and acceptable for high-power applications in comparison with resonant DC linked 3-level 3-phase voltage source type soft switching inverter proposed previously which can operate under a condition of zero voltage switching (ZVS). The digital control scheme of this inverter is presented. The steady-state performances of this inverter are illustrated and evaluated on the basis of the simulation results.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133190845","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}
This paper presents a sensorless direct torque control (DTC) propulsion control method for a 1/2-scale controlled permanent magnet (PM) linear synchronous motor (LSM) Maglev vehicle with minimum energy-loss attractive-levitation. To solve the practical problem of sensorless propulsion, DTC method is selected to control sensorlessly the thrust force and stator flux linkage of LSM, combining a voltage prediction control to decrease the variation of flux. To verify the controlled-PM Maglev propulsion theory, the vehicle is propelled by sensorless DTC method at standstill-levitation status with minimum energy-loss method. Experimental results show that, even under an extremely unbalance condition that coercive fore of one the four PM's installed on board is reduced strongly by 25%, the 256 kg-heavy-vehicle could be levitated very well with minimum energy-loss method. At levitation status, the vehicle also has been propelled sensorlessly following the demand position and speed above a low speed of 0.2 m/sec, even in acceleration and deceleration as well as constant speed phases, though there is a strong detent fore due to the large semi-closed slots which give a strong influence to the propulsion operating of DTC.
{"title":"Sensorless DTC propulsion of a 1/2-scale controlled-PM LSM vehicle with minimum energy-loss attractive-levitation","authors":"K. Yoshida, Z. Dai","doi":"10.1109/PCC.2002.998512","DOIUrl":"https://doi.org/10.1109/PCC.2002.998512","url":null,"abstract":"This paper presents a sensorless direct torque control (DTC) propulsion control method for a 1/2-scale controlled permanent magnet (PM) linear synchronous motor (LSM) Maglev vehicle with minimum energy-loss attractive-levitation. To solve the practical problem of sensorless propulsion, DTC method is selected to control sensorlessly the thrust force and stator flux linkage of LSM, combining a voltage prediction control to decrease the variation of flux. To verify the controlled-PM Maglev propulsion theory, the vehicle is propelled by sensorless DTC method at standstill-levitation status with minimum energy-loss method. Experimental results show that, even under an extremely unbalance condition that coercive fore of one the four PM's installed on board is reduced strongly by 25%, the 256 kg-heavy-vehicle could be levitated very well with minimum energy-loss method. At levitation status, the vehicle also has been propelled sensorlessly following the demand position and speed above a low speed of 0.2 m/sec, even in acceleration and deceleration as well as constant speed phases, though there is a strong detent fore due to the large semi-closed slots which give a strong influence to the propulsion operating of DTC.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133520645","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}
This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. An adaptive rotor flux observer, which adds an adaptive scheme for rotor speed, is applied to each induction motor in order to eliminate a flux sensor and a speed sensor. In driving a dual induction motor of the same rating, we examine characteristics of this proposed method from the simulation and the experiment.
{"title":"Characteristics of speed sensorless vector control of parallel connected dual induction motor fed by a single inverter","authors":"H. Kawai, Y. Kouno, K. Matsuse","doi":"10.1109/PCC.2002.997571","DOIUrl":"https://doi.org/10.1109/PCC.2002.997571","url":null,"abstract":"This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. An adaptive rotor flux observer, which adds an adaptive scheme for rotor speed, is applied to each induction motor in order to eliminate a flux sensor and a speed sensor. In driving a dual induction motor of the same rating, we examine characteristics of this proposed method from the simulation and the experiment.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132294101","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}
The stability problem is the main issue for a wind power generating system. In this paper, the stability assessment is examined with numerical simulations. The formulation for this system is developed at first, and then the simulation block diagram is constructed using MATLAB/SIMULINK. The stability margin is analyzed through simulations for various transmission line faults.
{"title":"Stability analysis of wind power generating system","authors":"T. Senjyu, N. Sueyoshi, K. Uezato, H. Fujita","doi":"10.1109/PCC.2002.998185","DOIUrl":"https://doi.org/10.1109/PCC.2002.998185","url":null,"abstract":"The stability problem is the main issue for a wind power generating system. In this paper, the stability assessment is examined with numerical simulations. The formulation for this system is developed at first, and then the simulation block diagram is constructed using MATLAB/SIMULINK. The stability margin is analyzed through simulations for various transmission line faults.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132300140","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}
This paper is related to the noncontact energy transfer system which can stabilize the load voltage with no feedback control used three resonant circuits. This system which employs a detachable transformer for magnetic coupling has a leakage inductance. Therefore load voltage decreases greatly in proportion to load electric current. A feedback control circuit of the noncontact energy transfer system is more complicated than that of the contact energy transfer system. Namely, a noncontact energy transfer system with no-feedback system is expected for stabilization of the load voltage. A high efficiency noncontact energy transfer system requires several resonant circuits such as resonant inverter and resonant circuit for load matching. The authors found a novel method which minimizes the load voltage drop rate by using optimized capacitance value of above the resonant circuits.
{"title":"Load voltage stabilization of noncontact energy transfer using three resonant circuit","authors":"H. Abe, H. Sakamoto, K. Harada","doi":"10.1109/PCC.2002.997563","DOIUrl":"https://doi.org/10.1109/PCC.2002.997563","url":null,"abstract":"This paper is related to the noncontact energy transfer system which can stabilize the load voltage with no feedback control used three resonant circuits. This system which employs a detachable transformer for magnetic coupling has a leakage inductance. Therefore load voltage decreases greatly in proportion to load electric current. A feedback control circuit of the noncontact energy transfer system is more complicated than that of the contact energy transfer system. Namely, a noncontact energy transfer system with no-feedback system is expected for stabilization of the load voltage. A high efficiency noncontact energy transfer system requires several resonant circuits such as resonant inverter and resonant circuit for load matching. The authors found a novel method which minimizes the load voltage drop rate by using optimized capacitance value of above the resonant circuits.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134314755","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}
This paper proposes a soft-switched three-phase-single-switch-boost-rectifier circuit. The proposed circuit can perform zero-voltage-switching (ZVS) without any current and voltage sensors. For this circuit, both simulation and experiments have been performed. The results not only confirmed the zero-voltage-switching (ZVS) but also indicated that, compared to the conventional hard-switched rectifier, the proposed circuit improves the efficiency as much as 2.7% while keeping the same high power factor and small harmonic distortion in their AC input.
{"title":"Soft switched three-phase single switch boost-type rectifier","authors":"D. Tokushima, H. Ishikawa, D. Wang, H. Naitoh","doi":"10.1109/PCC.2002.997567","DOIUrl":"https://doi.org/10.1109/PCC.2002.997567","url":null,"abstract":"This paper proposes a soft-switched three-phase-single-switch-boost-rectifier circuit. The proposed circuit can perform zero-voltage-switching (ZVS) without any current and voltage sensors. For this circuit, both simulation and experiments have been performed. The results not only confirmed the zero-voltage-switching (ZVS) but also indicated that, compared to the conventional hard-switched rectifier, the proposed circuit improves the efficiency as much as 2.7% while keeping the same high power factor and small harmonic distortion in their AC input.","PeriodicalId":320424,"journal":{"name":"Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134584589","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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