Pub Date : 2007-11-01DOI: 10.1109/PEDS.2007.4487890
M. Veerachary, S. Sudhakar
Stability analysis of the cascaded DC-DC power electronic system is analyzed in this paper. For demonstration boost converter supplying the hybrid switched capacitor converter considered as an example. The boost converter is acting as the bus converter, 42 V bus, while the switched capacitor converter is the point of load converter. The two converters are provided with voltage- mode and peak-current-mode controllers. Converter two- port network models are developed and then stability of the cascaded system has been analyzed. Cascaded system interaction effects, (i) source converter power handling capability with switching load, and (ii) load converter interfacing capability with bus converter, are analyzed. Simulation and experimental results are provided for verification purpose.
{"title":"Stability Analysis of Cascaded DC-DC Power Electronic System","authors":"M. Veerachary, S. Sudhakar","doi":"10.1109/PEDS.2007.4487890","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487890","url":null,"abstract":"Stability analysis of the cascaded DC-DC power electronic system is analyzed in this paper. For demonstration boost converter supplying the hybrid switched capacitor converter considered as an example. The boost converter is acting as the bus converter, 42 V bus, while the switched capacitor converter is the point of load converter. The two converters are provided with voltage- mode and peak-current-mode controllers. Converter two- port network models are developed and then stability of the cascaded system has been analyzed. Cascaded system interaction effects, (i) source converter power handling capability with switching load, and (ii) load converter interfacing capability with bus converter, are analyzed. Simulation and experimental results are provided for verification purpose.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"148 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":"122837532","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.2007.4487689
B. Singh, G. Kasal
This paper deals with a voltage and frequency controller for parallel operated isolated asynchronous generators used in constant power applications such as driven by uncontrolled pico hydro turbines. The proposed controller is having capability of controlling the voltage and frequency in decoupled manner. For controlling the voltage, a static compensator (STATCOM) is used as a reactive power compensator along with harmonic eliminator and a load balancer while for controlling the frequency; an electronic load controller (ELC) is used to regulate the total active power at the generators terminals. The STATCOM is realized using IGBTs (Insulated gate bipolar junction transistors) based voltage source converter (VSC), and a capacitor as an energy storage element at its DC link, while an ELC consists of a diode bridge rectifier, a chopper switch and an auxiliary load. The proposed generating system along with its controller is modeled in MATLAB using SIMULINK and PSB (Power System Block Sets) toolboxes. The simulated results are presented to demonstrate the capability of an isolated generating system with the proposed controller.
本文研究了一种用于无控微型水轮机驱动等恒功率并联隔离异步发电机的电压频率控制器。该控制器具有对电压和频率进行解耦控制的能力。在控制电压时，采用静态补偿器(STATCOM)与谐波消除器和负载平衡器一起作为无功补偿器，同时控制频率;电子负载控制器(ELC)用于调节发电机终端的总有功功率。STATCOM采用基于igbt(绝缘栅双极结晶体管)的电压源变换器(VSC)和电容作为直流链路的储能元件来实现，而ELC由二极管桥式整流器、斩波开关和辅助负载组成。利用SIMULINK和PSB (Power system Block Sets)工具箱在MATLAB中对该发电系统及其控制器进行了建模。仿真结果验证了该控制器在隔离发电系统中的控制性能。
{"title":"Voltage and Frequency Controller for Parallel Operated Isolated Asynchronous Generators","authors":"B. Singh, G. Kasal","doi":"10.1109/PEDS.2007.4487689","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487689","url":null,"abstract":"This paper deals with a voltage and frequency controller for parallel operated isolated asynchronous generators used in constant power applications such as driven by uncontrolled pico hydro turbines. The proposed controller is having capability of controlling the voltage and frequency in decoupled manner. For controlling the voltage, a static compensator (STATCOM) is used as a reactive power compensator along with harmonic eliminator and a load balancer while for controlling the frequency; an electronic load controller (ELC) is used to regulate the total active power at the generators terminals. The STATCOM is realized using IGBTs (Insulated gate bipolar junction transistors) based voltage source converter (VSC), and a capacitor as an energy storage element at its DC link, while an ELC consists of a diode bridge rectifier, a chopper switch and an auxiliary load. The proposed generating system along with its controller is modeled in MATLAB using SIMULINK and PSB (Power System Block Sets) toolboxes. The simulated results are presented to demonstrate the capability of an isolated generating system with the proposed controller.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"36 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":"122929271","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.2007.4487835
H. Hotait, A. Massoud, S. Finney, B. Williams
In this paper a new five-level inverter capacitor voltage balancing technique for high modulation index and high power factor operation is proposed. The proposed redundant state technique is based on dividing the space vector diagram of the five-level inverter into six three-level space vector diagrams. The original centre of the space vector diagram is shifted. New states of the space vector are determined, the dwelling time is calculated as for conventional two-level modulation, and the switching sequence is determined depending on the voltage level of the four dc link capacitors, using a redundant state method.
{"title":"Capacitor Voltage Balancing Using Redundant States for Five-Level Multilevel Inverter","authors":"H. Hotait, A. Massoud, S. Finney, B. Williams","doi":"10.1109/PEDS.2007.4487835","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487835","url":null,"abstract":"In this paper a new five-level inverter capacitor voltage balancing technique for high modulation index and high power factor operation is proposed. The proposed redundant state technique is based on dividing the space vector diagram of the five-level inverter into six three-level space vector diagrams. The original centre of the space vector diagram is shifted. New states of the space vector are determined, the dwelling time is calculated as for conventional two-level modulation, and the switching sequence is determined depending on the voltage level of the four dc link capacitors, using a redundant state method.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"13 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":"123887666","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.2007.4487877
P. Q. Dzung, L. M. Phương, P. Q. Vinh, N. M. Hoang, Nguyen Xuan Bac
This paper presents a new switching technique for direct torque control of induction motor using four-switch three phase inverter (DTC-FSTPI-IM) for low power applications. The modified switching table in this method is based on the principle of similarity between FSTPI and SSTPI (six-switch three phase inverter), where the alphabeta plan is divided into 6 sectors and the formation of the voltage space vector is done in the same way as for SSTPI by using effective (mean) vectors. This approach allows using the well-knowing established switching table of SSTPI for FSTPI, in order to reduce torque ripples in comparison with the conventional DTC method for FSTPI. The validity of new proposed technique is verified by simulation results using Matlab/Simulink and also experimentally by using DSpace 1104 Card.
{"title":"A New Switching Technique for Direct Torque Control of Induction Motor using Four-Switch Three-Phase Inverter","authors":"P. Q. Dzung, L. M. Phương, P. Q. Vinh, N. M. Hoang, Nguyen Xuan Bac","doi":"10.1109/PEDS.2007.4487877","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487877","url":null,"abstract":"This paper presents a new switching technique for direct torque control of induction motor using four-switch three phase inverter (DTC-FSTPI-IM) for low power applications. The modified switching table in this method is based on the principle of similarity between FSTPI and SSTPI (six-switch three phase inverter), where the alphabeta plan is divided into 6 sectors and the formation of the voltage space vector is done in the same way as for SSTPI by using effective (mean) vectors. This approach allows using the well-knowing established switching table of SSTPI for FSTPI, in order to reduce torque ripples in comparison with the conventional DTC method for FSTPI. The validity of new proposed technique is verified by simulation results using Matlab/Simulink and also experimentally by using DSpace 1104 Card.","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":"124045970","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.2007.4487872
Hong-Geuk Park, A. G. Abo-Khalil, Dong-Choon Lee, K. Son
This paper proposes a control scheme which can eliminate the torque ripple of the DFIM at unbalanced source voltage. The machine torque is expressed using the positive and negative sequence components of the voltage and current. For suppression of the torque ripple, the stator reactive power ripple is controlled to be zero. The proposed torque elimination method is verified by simulation results using PSCAD/EMTDC.
{"title":"Torque Ripple Elimination for Doubly-Fed Induction Motors under Unbalanced Source Voltage","authors":"Hong-Geuk Park, A. G. Abo-Khalil, Dong-Choon Lee, K. Son","doi":"10.1109/PEDS.2007.4487872","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487872","url":null,"abstract":"This paper proposes a control scheme which can eliminate the torque ripple of the DFIM at unbalanced source voltage. The machine torque is expressed using the positive and negative sequence components of the voltage and current. For suppression of the torque ripple, the stator reactive power ripple is controlled to be zero. The proposed torque elimination method is verified by simulation results using PSCAD/EMTDC.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"35 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":"121298663","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.2007.4487709
A. N. Arvindan, V. Sharma
This paper presents unity, lagging and leading power factor operations, with near sinusoidal line currents, of the bi-directional buck type improved power quality AC-DC converter (IPQC) that employs power MOSFET embedded two-quadrant switches (2QSWs). The topology of the IPQC itself is capable of providing variable bi-directional DC link voltage and non-reversible current i.e. two quadrant operation, however, application of the hysteresis-band current control (HCC) pulse width modulation (PWM) technique renders operation of the converter in either quadrant, with a harmonic profile at the utility interface conforming to the IEEE 519 stipulations, by appropriately modifying the switching pattern of the 2QSWs. The control strategy is evaluated for the IPQC by simulations implemented in the single-phase topology of the converter. Results confirm that the technique confers IEEE 519 compliance on the converter with regard to the Total Harmonic Distortion (THD), and, are presented for unity, and, leading and lagging power factor operations in the rectification and inversion modes respectively.
{"title":"HCC PWM Control of the Single-Phase Bi-Directional Buck Converter giving IEEE 519 Compliance at any Power Factor","authors":"A. N. Arvindan, V. Sharma","doi":"10.1109/PEDS.2007.4487709","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487709","url":null,"abstract":"This paper presents unity, lagging and leading power factor operations, with near sinusoidal line currents, of the bi-directional buck type improved power quality AC-DC converter (IPQC) that employs power MOSFET embedded two-quadrant switches (2QSWs). The topology of the IPQC itself is capable of providing variable bi-directional DC link voltage and non-reversible current i.e. two quadrant operation, however, application of the hysteresis-band current control (HCC) pulse width modulation (PWM) technique renders operation of the converter in either quadrant, with a harmonic profile at the utility interface conforming to the IEEE 519 stipulations, by appropriately modifying the switching pattern of the 2QSWs. The control strategy is evaluated for the IPQC by simulations implemented in the single-phase topology of the converter. Results confirm that the technique confers IEEE 519 compliance on the converter with regard to the Total Harmonic Distortion (THD), and, are presented for unity, and, leading and lagging power factor operations in the rectification and inversion modes respectively.","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":"128956597","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.2007.4487796
J. Rost, H. Gueldner, R. Hellinger, A. Weller
A method for modelling a linear synchronous drive-based transportation system is presented. The linear drive consists of power converter units, a cable network and long stator windings. These transmission elements can be modelled using two-port theory with frequency-dependent parameters. For characterisation of the frequency dependence of these parameters, polynomial functions, rational functions or equivalent circuits can be used. These characterisation techniques are compared with regard to their relative error. Furthermore, a method for transmission line parameter estimation during commissioning of the system is proposed.
{"title":"Modelling of the Feeding Network of a Linear Synchronous Machine and Estimation of Model Parameters","authors":"J. Rost, H. Gueldner, R. Hellinger, A. Weller","doi":"10.1109/PEDS.2007.4487796","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487796","url":null,"abstract":"A method for modelling a linear synchronous drive-based transportation system is presented. The linear drive consists of power converter units, a cable network and long stator windings. These transmission elements can be modelled using two-port theory with frequency-dependent parameters. For characterisation of the frequency dependence of these parameters, polynomial functions, rational functions or equivalent circuits can be used. These characterisation techniques are compared with regard to their relative error. Furthermore, a method for transmission line parameter estimation during commissioning of the system is proposed.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"40 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":"129144456","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.2007.4487762
F. J. Chivite-Zabalza, A. Forsyth
This paper presents a 3-phase, voltage-sourced, 48-pulse converter. The converter results from the combination of a series connected 12-pulse voltage- sourced rectifier with a passive voltage injection circuit, a passive current injection circuit and a bi-directional switch. The voltage and current injection circuits each use a single-phase rectifier bridge and a single-phase transformer circuit. Both the injection circuits and the bidirectional switch operate at six times the supply frequency and have a low rating. In this paper the converter operation is explained, analysed and simulated.
{"title":"A 48-pulse converter using dc-ripple injection","authors":"F. J. Chivite-Zabalza, A. Forsyth","doi":"10.1109/PEDS.2007.4487762","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487762","url":null,"abstract":"This paper presents a 3-phase, voltage-sourced, 48-pulse converter. The converter results from the combination of a series connected 12-pulse voltage- sourced rectifier with a passive voltage injection circuit, a passive current injection circuit and a bi-directional switch. The voltage and current injection circuits each use a single-phase rectifier bridge and a single-phase transformer circuit. Both the injection circuits and the bidirectional switch operate at six times the supply frequency and have a low rating. In this paper the converter operation is explained, analysed and simulated.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"75 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":"115951759","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.2007.4487681
K. Yingkayun, S. Premrudeepreechacharn, K. Oranpiroj
This paper represents the methodology for monitoring continuously of power quality (PQ) by using real-time operating system (RTOS). The monitoring system acquired analog signals and send data via Ethernet network based on RTOS programs. After obtained signals, the monitoring system then send PQ information to the personal computer. The applied protocol is the user datagram protocol (UDP) to send PQ information via Ethernet. The architecture and software implementation are mentioned in the paper. An application test was created to test the throughput of the communication between the measurement point and the target computer.
{"title":"Power Quality Monitoring System Using Real-Time Operating System","authors":"K. Yingkayun, S. Premrudeepreechacharn, K. Oranpiroj","doi":"10.1109/PEDS.2007.4487681","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487681","url":null,"abstract":"This paper represents the methodology for monitoring continuously of power quality (PQ) by using real-time operating system (RTOS). The monitoring system acquired analog signals and send data via Ethernet network based on RTOS programs. After obtained signals, the monitoring system then send PQ information to the personal computer. The applied protocol is the user datagram protocol (UDP) to send PQ information via Ethernet. The architecture and software implementation are mentioned in the paper. An application test was created to test the throughput of the communication between the measurement point and the target computer.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"242 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":"116390365","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.2007.4487859
J. Q. Sun, K. W. Chan, D. Z. Fang, Hong Kong Sar
An approach of optimal generation rescheduling for security operation of power systems is proposed with a heuristic constraint of transient stability by setting the maximum generator angle difference less than a threshold value in a designated post-fault duration. With this constraint, a concept called stability performance index is introduced in the approach for developing optimal control model. Rules for evaluating the stability performance index are presented. A technique of inverse integration is utilized to evaluate the rescheduling actions by using the gradient of the index. This approach has the advantage that it is applicable to systems represented by complex detailed models. Case studies on the 10-machine New England test power system are given to show the effectiveness and efficiency of the approach. The results suggest that this approach is able to ensure the system operation security in avoiding any potential transient instability.
{"title":"Optimal Generation Rescheduling for Security Operation of Power Systems Using Optimal Control Theory","authors":"J. Q. Sun, K. W. Chan, D. Z. Fang, Hong Kong Sar","doi":"10.1109/PEDS.2007.4487859","DOIUrl":"https://doi.org/10.1109/PEDS.2007.4487859","url":null,"abstract":"An approach of optimal generation rescheduling for security operation of power systems is proposed with a heuristic constraint of transient stability by setting the maximum generator angle difference less than a threshold value in a designated post-fault duration. With this constraint, a concept called stability performance index is introduced in the approach for developing optimal control model. Rules for evaluating the stability performance index are presented. A technique of inverse integration is utilized to evaluate the rescheduling actions by using the gradient of the index. This approach has the advantage that it is applicable to systems represented by complex detailed models. Case studies on the 10-machine New England test power system are given to show the effectiveness and efficiency of the approach. The results suggest that this approach is able to ensure the system operation security in avoiding any potential transient instability.","PeriodicalId":166704,"journal":{"name":"2007 7th International Conference on Power Electronics and Drive Systems","volume":"102 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":"116425976","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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