A new 3-/spl phi/ AC-to-DC single stage converter is proposed integrating a 3-/spl phi/ DCM boost with a DC-to-DC fixed frequency parallel resonant converter (PRC). This converter has the following features: natural power factor correction with the fast regulation, soft switching, HF transformer isolation with the resonant tank operating in above resonance mode, etc. A new gating control scheme is used for simultaneous control of boost converter and the PRC. Modes of operation are presented and analyzed. Based on the analysis, design curves are obtained. An optimum design is given and a design example is presented. Both SPICE simulation and experimental results for the designed converter are given to verify the theory and performance of the proposed converter for varying load as well as line voltage.
提出了一种新的3-/spl phi/ ac - dc单级变换器，将3-/spl phi/ DCM升压与dc - dc固定频率并联谐振变换器(PRC)集成在一起。该变换器具有快速调节的自然功率因数校正、软开关、高频变压器隔离和谐振箱在上述谐振模式下工作等特点。采用一种新的门控控制方案，实现升压变换器和PRC的同步控制。提出并分析了运行模式。在此基础上，得到了设计曲线。给出了优化设计方法，并给出了设计实例。给出了所设计变换器的SPICE仿真和实验结果，验证了所设计变换器在变负载和变电压下的理论和性能。
{"title":"A three-phase single-stage AC/DC boost integrated parallel resonant converter","authors":"F. Hamdad, A. Bhat","doi":"10.1109/PCC.2002.997566","DOIUrl":"https://doi.org/10.1109/PCC.2002.997566","url":null,"abstract":"A new 3-/spl phi/ AC-to-DC single stage converter is proposed integrating a 3-/spl phi/ DCM boost with a DC-to-DC fixed frequency parallel resonant converter (PRC). This converter has the following features: natural power factor correction with the fast regulation, soft switching, HF transformer isolation with the resonant tank operating in above resonance mode, etc. A new gating control scheme is used for simultaneous control of boost converter and the PRC. Modes of operation are presented and analyzed. Based on the analysis, design curves are obtained. An optimum design is given and a design example is presented. Both SPICE simulation and experimental results for the designed converter are given to verify the theory and performance of the proposed converter for varying load as well as line voltage.","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":"115003264","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 Norwegian company Norsk Hydro AS has frequently experienced severe vibration problems within the power generator trains at some of their oil platforms in the North Sea. Initially, these problems were believed to have a pure mechanical nature. The generator shaft was therefore modified to increase its inherent damping, but this only partly solved the problem. The focus was eventually directed to possible sources for the problems within the electrical power grid, especially two 7 MW variable speed drives (VSD) that serve as compressor drives. These drives are designed as current source converters (CSC), which feed synchronous motors. In order to clarify whether the vibration problems were caused by interaction between the VSDs and the generator train it was decided to carry out a detailed analysis using the simulation tool PSCAD/EMTDC. The simulated system includes a fully detailed model of the two 7 MW compressor drives and the turbine-generator train, as well as other relevant parts of the electrical system. The simulation results show that the VSDs can cause excessive vibration levels by two different phenomena: interharmonics and negative damping. It is verified that the redesigned shaft gives a lower vibration level, and that the resulting vibration level becomes reduced in the presence of passive electrical loads. The results and the simulation model are subject to further analysis in order to find permanent corrective actions to the problems, e.g. by means of dedicated power electronic devices.
{"title":"Simulation of shaft vibrations due to interaction between turbine-generator train and power electronic converters at the Visund oil platform","authors":"M. Hernes, B. Gustavsen","doi":"10.1109/PCC.2002.998175","DOIUrl":"https://doi.org/10.1109/PCC.2002.998175","url":null,"abstract":"The Norwegian company Norsk Hydro AS has frequently experienced severe vibration problems within the power generator trains at some of their oil platforms in the North Sea. Initially, these problems were believed to have a pure mechanical nature. The generator shaft was therefore modified to increase its inherent damping, but this only partly solved the problem. The focus was eventually directed to possible sources for the problems within the electrical power grid, especially two 7 MW variable speed drives (VSD) that serve as compressor drives. These drives are designed as current source converters (CSC), which feed synchronous motors. In order to clarify whether the vibration problems were caused by interaction between the VSDs and the generator train it was decided to carry out a detailed analysis using the simulation tool PSCAD/EMTDC. The simulated system includes a fully detailed model of the two 7 MW compressor drives and the turbine-generator train, as well as other relevant parts of the electrical system. The simulation results show that the VSDs can cause excessive vibration levels by two different phenomena: interharmonics and negative damping. It is verified that the redesigned shaft gives a lower vibration level, and that the resulting vibration level becomes reduced in the presence of passive electrical loads. The results and the simulation model are subject to further analysis in order to find permanent corrective actions to the problems, e.g. by means of dedicated power electronic devices.","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":"129454668","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 the steady-state and dynamic characteristics of the proposed Class-D power factor correction converter. In the proposed converter, the power factor and line current distortion are improved by using the third winding of the energy-storage reactor of buck-boost converter, and the high power efficiency is achieved by the soft-switching operations of the main power switch and output rectifier diode. As a result, it is clarified that the proposed circuit satisfies the IEC 61000-3-2 Class-D against changes of load. The maximum power factor is 0.83, minimum THD is 68% and maximum power efficiency is 92% at rated condition. Furthermore, it is revealed that the superior dynamic characteristics can be obtained under this circuit condition, and that the most suitable circuit parameters are obtained in both steady-state and dynamic characteristics.
{"title":"Steady-state and dynamic characteristics of the Class-D power factor correction converter using magnetic coupling","authors":"H. Matsuo, F. Kurokawa, K. Yokoyama, H. Watanabe","doi":"10.1109/PCC.2002.998508","DOIUrl":"https://doi.org/10.1109/PCC.2002.998508","url":null,"abstract":"This paper presents the steady-state and dynamic characteristics of the proposed Class-D power factor correction converter. In the proposed converter, the power factor and line current distortion are improved by using the third winding of the energy-storage reactor of buck-boost converter, and the high power efficiency is achieved by the soft-switching operations of the main power switch and output rectifier diode. As a result, it is clarified that the proposed circuit satisfies the IEC 61000-3-2 Class-D against changes of load. The maximum power factor is 0.83, minimum THD is 68% and maximum power efficiency is 92% at rated condition. Furthermore, it is revealed that the superior dynamic characteristics can be obtained under this circuit condition, and that the most suitable circuit parameters are obtained in both steady-state and dynamic characteristics.","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":"129465970","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}
A. Kawamura, K. Takeuchi, T. Furuya, Y. Takaoka, K. Yoshimoto, M. Cao
The acceleration and deceleration rate of the train depend on the tractive force. When the wheels of the train slip on the rails, the torque is decreased to avoid the continuous slipping. The reason is that the tractive coefficient between the wheels and the rails has a peak at a certain slip velocity. But this adhesive phenomenon is not clearly examined or analyzed. Thus we have developed a new adhesion test equipment. In this paper, we measured the tractive force with this equipment, and clarified the adhesive phenomenon. Then we proposed a new tractive force control and verified the effectiveness of the proposed control scheme.
{"title":"Measurement of the tractive force and the new adhesion control by the newly developed tractive force measurement equipment","authors":"A. Kawamura, K. Takeuchi, T. Furuya, Y. Takaoka, K. Yoshimoto, M. Cao","doi":"10.1109/PCC.2002.997637","DOIUrl":"https://doi.org/10.1109/PCC.2002.997637","url":null,"abstract":"The acceleration and deceleration rate of the train depend on the tractive force. When the wheels of the train slip on the rails, the torque is decreased to avoid the continuous slipping. The reason is that the tractive coefficient between the wheels and the rails has a peak at a certain slip velocity. But this adhesive phenomenon is not clearly examined or analyzed. Thus we have developed a new adhesion test equipment. In this paper, we measured the tractive force with this equipment, and clarified the adhesive phenomenon. Then we proposed a new tractive force control and verified the effectiveness of the proposed control scheme.","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":"129710856","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}
K. Nakata, K. Hiramoto, M. Sanada, S. Morimoto, Y. Takeda
A switched reluctance motor has a doubly salient structure, both stator and rotor have the saliency and it has an advantage in a harsh environments due to a simple and robust structure. However, it has the disadvantage that the motor is noisy because of the deformation by the radial force. This paper examines the radial force for various SRMs with a hole inside the pole using the two dimensional finite element method, and for typical models, the acoustic noise and efficiency are evaluated by the experiments. It is cleared that poles with a hole are effective to improve the noise, because the radial force reduces.
{"title":"Noise reduction for switched reluctance motor with a hole","authors":"K. Nakata, K. Hiramoto, M. Sanada, S. Morimoto, Y. Takeda","doi":"10.1109/PCC.2002.998100","DOIUrl":"https://doi.org/10.1109/PCC.2002.998100","url":null,"abstract":"A switched reluctance motor has a doubly salient structure, both stator and rotor have the saliency and it has an advantage in a harsh environments due to a simple and robust structure. However, it has the disadvantage that the motor is noisy because of the deformation by the radial force. This paper examines the radial force for various SRMs with a hole inside the pole using the two dimensional finite element method, and for typical models, the acoustic noise and efficiency are evaluated by the experiments. It is cleared that poles with a hole are effective to improve the noise, because the radial force reduces.","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":"128286646","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 paper presents a new microprocessor based technique for fast retrieval of the current and voltage sequence components based on symmetrical component theory. The two-sample delay algorithm can operate at an arbitrary sampling frequency and executes with minimal computational burden. A three-point median filter is utilized to remove the impulsive noise that appears during the transient process. Simulations show that an optimal transient performance can be achieved using the proposed technique under unbalanced situations. Finally, a field programmable gate array (FPGA) implementation has been constructed to verify the theoretical results.
{"title":"A new algorithm for fast retrieval of sequence components in 3-phase networks","authors":"Chunlin Li, F. Dawson","doi":"10.1109/PCC.2002.998171","DOIUrl":"https://doi.org/10.1109/PCC.2002.998171","url":null,"abstract":"The paper presents a new microprocessor based technique for fast retrieval of the current and voltage sequence components based on symmetrical component theory. The two-sample delay algorithm can operate at an arbitrary sampling frequency and executes with minimal computational burden. A three-point median filter is utilized to remove the impulsive noise that appears during the transient process. Simulations show that an optimal transient performance can be achieved using the proposed technique under unbalanced situations. Finally, a field programmable gate array (FPGA) implementation has been constructed to verify the theoretical 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":"128389705","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 paper brings an analytical model for calculating both the steady-state and transient performance of an induction motor fed from the three-phase voltage source inverter with space-vector PWM. The proposed method makes use of the Laplace and modified Z-transformation of the space vectors (mixed p-z approach) to predict current response of the induction motor. From the Laplace transform of the stator voltage vector we can also derive Fourier analysis to predict the voltage harmonic spectrum. Experimental tests have been carried out confirming the validity of the analytical results.
{"title":"Analytical model for the time and frequency domain analysis of space-vector PWM inverter fed induction motor based on the Laplace transform of space-vectors","authors":"J. Klima","doi":"10.1109/PCC.2002.998167","DOIUrl":"https://doi.org/10.1109/PCC.2002.998167","url":null,"abstract":"The paper brings an analytical model for calculating both the steady-state and transient performance of an induction motor fed from the three-phase voltage source inverter with space-vector PWM. The proposed method makes use of the Laplace and modified Z-transformation of the space vectors (mixed p-z approach) to predict current response of the induction motor. From the Laplace transform of the stator voltage vector we can also derive Fourier analysis to predict the voltage harmonic spectrum. Experimental tests have been carried out confirming the validity of the analytical 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":"127408761","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 new switched reluctance motor (SRM) drive circuit for torque ripple reduction. The main drawbacks of SRMs are large torque ripple and acoustic noise. The torque ripple can be reduced by the stator current waveform shaping. This paper gives ideal stator current waveforms for the flat instantaneous torque. The new SRM drive circuit is proposed to synthesize the actual stator current as close as possible to the ideal ones in waveforms. The computer simulation demonstrates that the new circuit brings much small torque ripple compared with that by the conventional SRM drive circuit.
{"title":"A new switched reluctance motor drive circuit for torque ripple reduction","authors":"Hiroki Ishikawa, Daohong Wang, H. Naitoh","doi":"10.1109/PCC.2002.997601","DOIUrl":"https://doi.org/10.1109/PCC.2002.997601","url":null,"abstract":"This paper presents a new switched reluctance motor (SRM) drive circuit for torque ripple reduction. The main drawbacks of SRMs are large torque ripple and acoustic noise. The torque ripple can be reduced by the stator current waveform shaping. This paper gives ideal stator current waveforms for the flat instantaneous torque. The new SRM drive circuit is proposed to synthesize the actual stator current as close as possible to the ideal ones in waveforms. The computer simulation demonstrates that the new circuit brings much small torque ripple compared with that by the conventional SRM drive circuit.","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":"122374015","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 an efficiency optimized speed control scheme of field oriented induction motor. In order to take core loss into account, we insert a core loss resistance in parallel to internal induced voltage branch into the d-q axes equivalent circuit. The optimum efficiency controller is to realize the optimum slip angular frequency to minimize the controllable losses composed of copper losses and core loss by rotor flux weakening under field oriented control. We construct the speed control system with efficiency optimization applied on optimal regulator theory. The effectiveness of this control scheme is confirmed by simulation results.
{"title":"Efficiency optimized speed control of field oriented induction motor including core loss","authors":"A. Mannan, T. Murata, J. Tamura, T. Tsuchiya","doi":"10.1109/PCC.2002.998164","DOIUrl":"https://doi.org/10.1109/PCC.2002.998164","url":null,"abstract":"This paper presents an efficiency optimized speed control scheme of field oriented induction motor. In order to take core loss into account, we insert a core loss resistance in parallel to internal induced voltage branch into the d-q axes equivalent circuit. The optimum efficiency controller is to realize the optimum slip angular frequency to minimize the controllable losses composed of copper losses and core loss by rotor flux weakening under field oriented control. We construct the speed control system with efficiency optimization applied on optimal regulator theory. The effectiveness of this control scheme is confirmed by 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":"130961388","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}
G. Takata, J. Tahara, M. Michihira, A. Tsuyoshi, K. Amako, H. Omori, K. Yasui
The time frequency analysis technique using wavelet transform is proposed to overcome EMC (electromagnetic compatibility) problems. The proposed technique takes into consideration the change in amplitude of the harmonics during the observation. By applying it to harmonics analysis, we can analyze the harmonics from not only the frequency but also the time point of view. Therefore, it enables us to obtain the effective solution for harmonics problems. In this paper, a wavelet transform is carried out against the actual measured data. Based on obtained results, it is shown that the features and high validity of the proposed technique for the power electronics field by comparing with the previous approach using FFT (fast Fourier transform).
{"title":"The time-frequency analysis of the harmonics with wavelet transform for the power electronics systems","authors":"G. Takata, J. Tahara, M. Michihira, A. Tsuyoshi, K. Amako, H. Omori, K. Yasui","doi":"10.1109/PCC.2002.997610","DOIUrl":"https://doi.org/10.1109/PCC.2002.997610","url":null,"abstract":"The time frequency analysis technique using wavelet transform is proposed to overcome EMC (electromagnetic compatibility) problems. The proposed technique takes into consideration the change in amplitude of the harmonics during the observation. By applying it to harmonics analysis, we can analyze the harmonics from not only the frequency but also the time point of view. Therefore, it enables us to obtain the effective solution for harmonics problems. In this paper, a wavelet transform is carried out against the actual measured data. Based on obtained results, it is shown that the features and high validity of the proposed technique for the power electronics field by comparing with the previous approach using FFT (fast Fourier transform).","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":"130989808","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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