Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487759
A. Singer, W. Hofmann
Permanent magnet salient pole synchronous connected dc network produces less power than the rated power even at rated excitation. Static synchronous series compensation (SSSC) provides a solution to this problem. Since SSSC compensates the reactance voltages drop of the generator. The passive filters are used to eliminate the harmonics which are generated by nonlinear loads. This paper presents simulation and experimental results when applying static synchronous series compensation and passive filter to permanent magnet salient pole synchronous generator (PSG) in order to increase the output power, stabilize the output voltage and get rid of the harmonic respectively.
{"title":"Combined System of Static Synchronous Series Compensation and Passive Filter applied to Wind Energy Conversion System","authors":"A. Singer, W. Hofmann","doi":"10.1109/PEDS.2007.4487759","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487759","url":null,"abstract":"Permanent magnet salient pole synchronous connected dc network produces less power than the rated power even at rated excitation. Static synchronous series compensation (SSSC) provides a solution to this problem. Since SSSC compensates the reactance voltages drop of the generator. The passive filters are used to eliminate the harmonics which are generated by nonlinear loads. This paper presents simulation and experimental results when applying static synchronous series compensation and passive filter to permanent magnet salient pole synchronous generator (PSG) in order to increase the output power, stabilize the output voltage and get rid of the harmonic respectively.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"127 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113953532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487926
Chang-Hua Lin, Tsung-You Hung, Chien-Ming Wang, Kai-Jun Pai
A mathematical model of parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect on electric characteristics. First, a class D resonant backlight inverter is employed to act as the main circuit. Next, the phase angle variations caused by the parasitic capacitances is considered as a reference parameter in the proposed control strategy. By using the primary-side control and incorporating the DPLL technique to form a feedback mechanism to track the optimal operating frequency. And then the influence of parasitic capacitance can be reduced so as to eliminate the leakage current effect, hence, the system efficiency and stability will be improved. Complete mathematical analysis and design considerations are detailed. Experimental results agree with the theoretical predictions.
{"title":"Modeling of the Parasitical Capacitance Effect in LCD Panel and Corresponding Elimination Strategy","authors":"Chang-Hua Lin, Tsung-You Hung, Chien-Ming Wang, Kai-Jun Pai","doi":"10.1109/PEDS.2007.4487926","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487926","url":null,"abstract":"A mathematical model of parasitical capacitance in LCD panel is conducted to explore the influence of leakage current effect on electric characteristics. First, a class D resonant backlight inverter is employed to act as the main circuit. Next, the phase angle variations caused by the parasitic capacitances is considered as a reference parameter in the proposed control strategy. By using the primary-side control and incorporating the DPLL technique to form a feedback mechanism to track the optimal operating frequency. And then the influence of parasitic capacitance can be reduced so as to eliminate the leakage current effect, hence, the system efficiency and stability will be improved. Complete mathematical analysis and design considerations are detailed. Experimental results agree with the theoretical predictions.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122307485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487941
W. Pusorn, W. Srisongkram, W. Subsingha, S. Deng-em, P. Boonchiam
This paper presents a solid state circuit breaker (SSCB) for a low distribution level. When voltage disturbances occurred, the SSCB operates for keeping the system limitations. Power semiconductor devices are compared and selected by using the performances of their devices. SSCB is provided with circuitry for permitting off/on/reset operations actuated by a mechanical toggle control switch for close simulation of magnetic circuit breaker operation. A power continuity feature is provided for load power by locating the control switch so that it opens all of the circuit, except the static power switch branch, between the source and the load, to provide a high degree of fail-safe protection for the apparatus. The synchronous reference frame is used to detect the current disturbances and control the switches. Simulation results are shown that SSCB offers advantages when compared to present solutions. A switching circuit that is particularly applicable to high voltage 3 phases solid state circuit breakers (SSCB). The circuit comprises a solid state switch; an energy absorbing device connected in parallel with said switch to form a parallel combination; an inductor connected in series with said parallel combination; and a control circuit connected to said solid state switch and adapted to turn off said switch in response to a predetermined voltage/current condition.
{"title":"Low Cost AC Solid State Circuit Breaker","authors":"W. Pusorn, W. Srisongkram, W. Subsingha, S. Deng-em, P. Boonchiam","doi":"10.1109/PEDS.2007.4487941","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487941","url":null,"abstract":"This paper presents a solid state circuit breaker (SSCB) for a low distribution level. When voltage disturbances occurred, the SSCB operates for keeping the system limitations. Power semiconductor devices are compared and selected by using the performances of their devices. SSCB is provided with circuitry for permitting off/on/reset operations actuated by a mechanical toggle control switch for close simulation of magnetic circuit breaker operation. A power continuity feature is provided for load power by locating the control switch so that it opens all of the circuit, except the static power switch branch, between the source and the load, to provide a high degree of fail-safe protection for the apparatus. The synchronous reference frame is used to detect the current disturbances and control the switches. Simulation results are shown that SSCB offers advantages when compared to present solutions. A switching circuit that is particularly applicable to high voltage 3 phases solid state circuit breakers (SSCB). The circuit comprises a solid state switch; an energy absorbing device connected in parallel with said switch to form a parallel combination; an inductor connected in series with said parallel combination; and a control circuit connected to said solid state switch and adapted to turn off said switch in response to a predetermined voltage/current condition.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122715332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487833
A. Ashaibi, S. Finney, B. Williams, A. Massoud
The diode clamped multilevel inverter (DCMLI) is an attractive high voltage multilevel inverter due to its robustness. The main draw back of the DCMLI is dc link capacitor voltage imbalance. A diode clamped inverter has been used in this research. The method used to balance the dc link capacitors is based on auxiliary switch-mode circuits, which are operated in a discontinuous inductor current mode. This research is focused on how to use auxiliary SMPS circuits to start up, balance, and shutdown the inverter. These functions are an issue in high voltage applications of the multilevel inverter. Simulation and experimental results are presented for the proposed auxiliary circuits operational technique.
{"title":"Extend the Use of Auxiliary Circuit to Start up, Shut down, and Balance of the Modified Diode Clamped Multilevel Inverter","authors":"A. Ashaibi, S. Finney, B. Williams, A. Massoud","doi":"10.1109/PEDS.2007.4487833","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487833","url":null,"abstract":"The diode clamped multilevel inverter (DCMLI) is an attractive high voltage multilevel inverter due to its robustness. The main draw back of the DCMLI is dc link capacitor voltage imbalance. A diode clamped inverter has been used in this research. The method used to balance the dc link capacitors is based on auxiliary switch-mode circuits, which are operated in a discontinuous inductor current mode. This research is focused on how to use auxiliary SMPS circuits to start up, balance, and shutdown the inverter. These functions are an issue in high voltage applications of the multilevel inverter. Simulation and experimental results are presented for the proposed auxiliary circuits operational technique.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"10 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122508974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487684
T. Plum, R. D. De Doncker
The design of semiconductor devices is usually performed with finite element methods. In this paper an analytical approach for the design of a high- power MOS turn-off thyristor (MTO) is presented. The model enables the calculation of on-state voltage drop and turn-off losses analytically. The results are compared to a finite-element (FE) model of the MTO. The analytical model offers a high degree of accuracy together with fast calculation times and can therefore be used to find an optimized device design for a given application.
{"title":"Analytical Design of High-Power MTO Thyristors","authors":"T. Plum, R. D. De Doncker","doi":"10.1109/PEDS.2007.4487684","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487684","url":null,"abstract":"The design of semiconductor devices is usually performed with finite element methods. In this paper an analytical approach for the design of a high- power MOS turn-off thyristor (MTO) is presented. The model enables the calculation of on-state voltage drop and turn-off losses analytically. The results are compared to a finite-element (FE) model of the MTO. The analytical model offers a high degree of accuracy together with fast calculation times and can therefore be used to find an optimized device design for a given application.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126235982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487893
T. Noguchi, K. Sano
This paper focuses on specific harmonic active power suppression of a direct-power-controlled (DPC) PWM current-source rectifier (CSR) in order to achieve low distortion of the input line currents. Total input power factor of the DPC-based PWMCSR becomes worse as the load gets lower due to the low-order harmonics in the line currents, especially the fifth and the seventh. Since the dominant low-order harmonic currents cause an oscillation in the active power at frequency of sixth, suppression of the sixth-order harmonic active power is essential to improve the total power factor particularly in the low-load range. The paper describes a theoretical aspect and a suppression technique of the harmonic active power, followed by basic configuration and operation of the DPC-based PWMCSR. Effectiveness of the proposed technique is confirmed through computer simulations and experimental tests, using a 2-kW prototype. As a result, the total harmonic distortion of the line currents is effectively reduced by 10 %, which results in approximately 20-% improvement of the total input power factor at a 350-W load condition.
{"title":"Specific Harmonic Power Suppression of Drector-Power-Controlled Current-Source PWM Rectifier","authors":"T. Noguchi, K. Sano","doi":"10.1109/PEDS.2007.4487893","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487893","url":null,"abstract":"This paper focuses on specific harmonic active power suppression of a direct-power-controlled (DPC) PWM current-source rectifier (CSR) in order to achieve low distortion of the input line currents. Total input power factor of the DPC-based PWMCSR becomes worse as the load gets lower due to the low-order harmonics in the line currents, especially the fifth and the seventh. Since the dominant low-order harmonic currents cause an oscillation in the active power at frequency of sixth, suppression of the sixth-order harmonic active power is essential to improve the total power factor particularly in the low-load range. The paper describes a theoretical aspect and a suppression technique of the harmonic active power, followed by basic configuration and operation of the DPC-based PWMCSR. Effectiveness of the proposed technique is confirmed through computer simulations and experimental tests, using a 2-kW prototype. As a result, the total harmonic distortion of the line currents is effectively reduced by 10 %, which results in approximately 20-% improvement of the total input power factor at a 350-W load condition.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126618859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487943
T. Tayjasanant
This paper presents a graphic user interface (GUI)-based program for harmonic impedance calculation. The GUI feature provides the user with visual interaction and facilitates the analysis. The harmonic impedance calculation is based on two steady-state conditions of voltage and current waveforms. Modal transformations and weighting average method are presented and proposed. The program has been tested using two actual field measurements.
{"title":"A Graphic User Interface-based Program for Harmonic Impedance Calculation","authors":"T. Tayjasanant","doi":"10.1109/PEDS.2007.4487943","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487943","url":null,"abstract":"This paper presents a graphic user interface (GUI)-based program for harmonic impedance calculation. The GUI feature provides the user with visual interaction and facilitates the analysis. The harmonic impedance calculation is based on two steady-state conditions of voltage and current waveforms. Modal transformations and weighting average method are presented and proposed. The program has been tested using two actual field measurements.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126780111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487786
Dong Lei, W. Lijie, Huan Shi, Gao Shuang, Liao Xiaozhong
The development of wind generation has rapidly progressed over the last decade, but it must be integrated into power grids and electric utility systems. However, it cannot be dispatched like conventional generators because the power generated by the wind changes rapidly because of the continuous fluctuation of wind speed and direction. So it is very important to predict the wind power generation. This paper discusses why the wind power generation can be predicted in short-term, and how to setup the construction of an ANN (artificial neural network) prediction model of wind power based on chaotic time series. The analysis of modeling with low dimensions nonlinear dynamics indicates that time series of wind power generation have chaotic characteristics, and wind power can be predicted in short-term. Phase space reconstruction method can be used for ANN model design. The data from the wind farm located in the Saihanba China are used for this study.
{"title":"Prediction of Wind Power Generation based on Chaotic Phase Space Reconstruction Models","authors":"Dong Lei, W. Lijie, Huan Shi, Gao Shuang, Liao Xiaozhong","doi":"10.1109/PEDS.2007.4487786","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487786","url":null,"abstract":"The development of wind generation has rapidly progressed over the last decade, but it must be integrated into power grids and electric utility systems. However, it cannot be dispatched like conventional generators because the power generated by the wind changes rapidly because of the continuous fluctuation of wind speed and direction. So it is very important to predict the wind power generation. This paper discusses why the wind power generation can be predicted in short-term, and how to setup the construction of an ANN (artificial neural network) prediction model of wind power based on chaotic time series. The analysis of modeling with low dimensions nonlinear dynamics indicates that time series of wind power generation have chaotic characteristics, and wind power can be predicted in short-term. Phase space reconstruction method can be used for ANN model design. The data from the wind farm located in the Saihanba China are used for this study.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127635237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487864
Min Lin, T. Nabeshima, T. Sato, K. Nishijima
A new control method using a hysteretic PWM controller for all types of converters and its proper design method are presented. The triangular voltage obtained from a simple RC network connected between comparator output and converter output is superimposed to the output voltage and as a feedback signal to a hysteretic comparator. Since the hysteretic PWM controller essentially has derivative characteristics and has no error amplifier, the presented method provides no steady-state error voltage on the output and excellent dynamic performances for the load current transient by choosing proper values of time constants in the RC network. Performances of the proposed controller are experimentally verified for the buck, buck-boost and boost converters.
{"title":"Design of a New Hysteretic PWM Controller for All Types of DC-to-DC Converters","authors":"Min Lin, T. Nabeshima, T. Sato, K. Nishijima","doi":"10.1109/PEDS.2007.4487864","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487864","url":null,"abstract":"A new control method using a hysteretic PWM controller for all types of converters and its proper design method are presented. The triangular voltage obtained from a simple RC network connected between comparator output and converter output is superimposed to the output voltage and as a feedback signal to a hysteretic comparator. Since the hysteretic PWM controller essentially has derivative characteristics and has no error amplifier, the presented method provides no steady-state error voltage on the output and excellent dynamic performances for the load current transient by choosing proper values of time constants in the RC network. Performances of the proposed controller are experimentally verified for the buck, buck-boost and boost converters.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129153803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487851
T. Wolbank, M. Vogelsberger, R. Stumberger
Speed sensorless control of AC machines at zero speed so far is only possible using signal injection methods. Especially when applied to induction machines spatial saturation leads to a heavy dependence of the control signals on the flux/load level. This dependence has to be identified on a special test stand during a commissioning procedure. To avoid the usage of a speed sensor as well as load dynamometer coupled during the commissioning an adaptive flux model is proposed that delivers an accurate reference flux angle. After the commissioning this adaptive flux model is used in combination with the signal injection method to deliver the spatial flux position.
{"title":"Adaptive Flux model for commissioning of signal injection based zero speed sensorless flux control of induction machines","authors":"T. Wolbank, M. Vogelsberger, R. Stumberger","doi":"10.1109/PEDS.2007.4487851","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487851","url":null,"abstract":"Speed sensorless control of AC machines at zero speed so far is only possible using signal injection methods. Especially when applied to induction machines spatial saturation leads to a heavy dependence of the control signals on the flux/load level. This dependence has to be identified on a special test stand during a commissioning procedure. To avoid the usage of a speed sensor as well as load dynamometer coupled during the commissioning an adaptive flux model is proposed that delivers an accurate reference flux angle. After the commissioning this adaptive flux model is used in combination with the signal injection method to deliver the spatial flux position.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131450481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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