Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.794627
Guoguang Zhang
Our purpose is to develop systematic analysis and design methods for a two-inertia system. A conventional PI speed control system with a torsional load is redesigned, and the damping characteristic of the system is derived and analyzed. It is shown that the dynamic characteristic of the system strongly depends on the inertia ratio of load to motor. Three kinds of typical pole assignments with identical radius/damping coefficient/real-part are applied and compared, and the merits of each pole assignment design are concluded. Furthermore, for small inertia ratio, we show how to improve the damping by a derivative feedback of motor speed.
{"title":"Speed control of two-inertia system by PI/PID control","authors":"Guoguang Zhang","doi":"10.1109/PEDS.1999.794627","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794627","url":null,"abstract":"Our purpose is to develop systematic analysis and design methods for a two-inertia system. A conventional PI speed control system with a torsional load is redesigned, and the damping characteristic of the system is derived and analyzed. It is shown that the dynamic characteristic of the system strongly depends on the inertia ratio of load to motor. Three kinds of typical pole assignments with identical radius/damping coefficient/real-part are applied and compared, and the merits of each pole assignment design are concluded. Furthermore, for small inertia ratio, we show how to improve the damping by a derivative feedback of motor speed.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122777703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.794577
M. Tsai, T. Cheng, C. Tsai
This paper presents a feasible method for AC power source burn-in test. The proposed architecture consists of two power stages, the AC/DC converter and the DC/AC inverter, where the former imitates the load characteristic and the latter sends back the recycling energy to the utility. Both two stages are regulated by conventional pulse width modulation (PWM) and operated in current-mode control. It consumes a less amount of energy than conventional method and provides extra flexibility for the test load. In addition, it can also correct the utility current which is rich in high harmonic distortion. To implement the proposed idea, a simple control strategy and system design are presented in this paper. Case study for AC motor driver is demonstrated by means of prototype experiment to prove its performance and effectiveness.
{"title":"High-efficiency energy recycling system for AC power source burn-in test","authors":"M. Tsai, T. Cheng, C. Tsai","doi":"10.1109/PEDS.1999.794577","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794577","url":null,"abstract":"This paper presents a feasible method for AC power source burn-in test. The proposed architecture consists of two power stages, the AC/DC converter and the DC/AC inverter, where the former imitates the load characteristic and the latter sends back the recycling energy to the utility. Both two stages are regulated by conventional pulse width modulation (PWM) and operated in current-mode control. It consumes a less amount of energy than conventional method and provides extra flexibility for the test load. In addition, it can also correct the utility current which is rich in high harmonic distortion. To implement the proposed idea, a simple control strategy and system design are presented in this paper. Case study for AC motor driver is demonstrated by means of prototype experiment to prove its performance and effectiveness.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115141702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792817
N. Yamamura, M. Ishida, T. Hori
The authors propose an inexpensive wind power generating system in this paper. Existing wind power generating systems are mostly of large capacity (over 100 kW) and high-priced (about 1000 USS/kW). Because of the erratic changes of wind power and of smoothing peak power, an AC/DC converter-fed battery system is recommended. Thus, one requires the exact rotating speed of generators (especially in the case of synchronous generators) to use AC/DC converters with high quality. These factors are increasing the cost of such systems. The authors adopt a compact permanent magnet type synchronous generator, which doesn't need exciting current, and a step-up/down buck-boost chopper to wind power generating system of a few kW output without position or speed sensor. In addition, they employ an inexpensive rectifier circuit using a diode bridge instead of an AC/DC power converter with PWM method. Using these methods, they achieve a simple and inexpensive wind power generating system.
{"title":"A simple wind power generating system with permanent magnet type synchronous generator","authors":"N. Yamamura, M. Ishida, T. Hori","doi":"10.1109/PEDS.1999.792817","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792817","url":null,"abstract":"The authors propose an inexpensive wind power generating system in this paper. Existing wind power generating systems are mostly of large capacity (over 100 kW) and high-priced (about 1000 USS/kW). Because of the erratic changes of wind power and of smoothing peak power, an AC/DC converter-fed battery system is recommended. Thus, one requires the exact rotating speed of generators (especially in the case of synchronous generators) to use AC/DC converters with high quality. These factors are increasing the cost of such systems. The authors adopt a compact permanent magnet type synchronous generator, which doesn't need exciting current, and a step-up/down buck-boost chopper to wind power generating system of a few kW output without position or speed sensor. In addition, they employ an inexpensive rectifier circuit using a diode bridge instead of an AC/DC power converter with PWM method. Using these methods, they achieve a simple and inexpensive wind power generating system.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131831962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792832
L. Ping, Meng Yu, K. Yong, Z. Hui, Chen Jian
In this paper, the single-phase boost power factor correction converter is discussed in detail. With the Fourier series analysis of the general model, the low frequency model and high frequency model are proposed. From the low frequency model, the expression of the duty cycle, the boundary between continuous current mode (CCM) and discontinuous current mode (DCM), the study of the cusp distortion and the ripple output voltage are developed. While the high frequency components of the input current are described based on the high frequency model. Theoretical results are demonstrated by simulation and experiments.
{"title":"Analysis of single-phase boost power factor correction (PFC) converter","authors":"L. Ping, Meng Yu, K. Yong, Z. Hui, Chen Jian","doi":"10.1109/PEDS.1999.792832","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792832","url":null,"abstract":"In this paper, the single-phase boost power factor correction converter is discussed in detail. With the Fourier series analysis of the general model, the low frequency model and high frequency model are proposed. From the low frequency model, the expression of the duty cycle, the boundary between continuous current mode (CCM) and discontinuous current mode (DCM), the study of the cusp distortion and the ripple output voltage are developed. While the high frequency components of the input current are described based on the high frequency model. Theoretical results are demonstrated by simulation and experiments.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115337705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.794582
Jianxin Tang
This paper addresses real-time control of DC motors using the MATLAB interfaced low cost TMS320C31 digital signal processing starter kit (DSK). A controller is designed using MATLAB functions to generate a set of coefficients associated with a desired controller's characteristics and included in a generic controller program transparent to the user. While the time response is plotted on the PC monitor screen using MATLAB, the controller is implemented on the DSK in real time to achieve the desired control functions. Test results on a motor speed control system show that actual output speeds agree with theoretical calculations.
{"title":"Real-time DC motor control using the MATLAB interfaced TMS320C31 digital signal processing starter kit (DSK)","authors":"Jianxin Tang","doi":"10.1109/PEDS.1999.794582","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794582","url":null,"abstract":"This paper addresses real-time control of DC motors using the MATLAB interfaced low cost TMS320C31 digital signal processing starter kit (DSK). A controller is designed using MATLAB functions to generate a set of coefficients associated with a desired controller's characteristics and included in a generic controller program transparent to the user. While the time response is plotted on the PC monitor screen using MATLAB, the controller is implemented on the DSK in real time to achieve the desired control functions. Test results on a motor speed control system show that actual output speeds agree with theoretical calculations.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117195509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792850
B. Chaudhari, S. Wekhande, S. S. Dhamse, S. Dhambhare
Sine wave pulse width modulation is most widely used in three-phase motor drives, UPS systems, static VAr compensators, etc. Variable frequency sine wave outputs with high stability can be achieved with digital circuits employing EPROMs and DACs. The conventional schemes normally use three EPROMs and three DACs along-with a triangular waveform generator. For better performance, the sine wave should be synchronized with the triangular wave. The performance needs restrict the selection of the frequency ratio. Two schemes are presented in this paper which use only one EPROM to generate the necessary signals for the SPWM. The schemes generate carrier and reference signals using the same EPROM maintaining exact synchronization, keeping the frequency ratio as an odd multiple of three for the entire speed range and ensure that the modulating signal and carrier signal have opposite slopes at coincident zero crossing. The application of these schemes reduces the cost and space for the generation of PWM signals and thus help the growing FHP drive market where cost is of paramount importance to induce a change from fixed speed to variable speed operation.
{"title":"A low cost high performance SPWM inverter","authors":"B. Chaudhari, S. Wekhande, S. S. Dhamse, S. Dhambhare","doi":"10.1109/PEDS.1999.792850","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792850","url":null,"abstract":"Sine wave pulse width modulation is most widely used in three-phase motor drives, UPS systems, static VAr compensators, etc. Variable frequency sine wave outputs with high stability can be achieved with digital circuits employing EPROMs and DACs. The conventional schemes normally use three EPROMs and three DACs along-with a triangular waveform generator. For better performance, the sine wave should be synchronized with the triangular wave. The performance needs restrict the selection of the frequency ratio. Two schemes are presented in this paper which use only one EPROM to generate the necessary signals for the SPWM. The schemes generate carrier and reference signals using the same EPROM maintaining exact synchronization, keeping the frequency ratio as an odd multiple of three for the entire speed range and ensure that the modulating signal and carrier signal have opposite slopes at coincident zero crossing. The application of these schemes reduces the cost and space for the generation of PWM signals and thus help the growing FHP drive market where cost is of paramount importance to induce a change from fixed speed to variable speed operation.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122658538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.794528
D. Sutanto
Summary form only as given. The emergency of new breeds of power electronics and improved battery technology has created renewed interests in battery energy storage system (BESS). BESS is a modern cost-effective solution that can help both electric utilities and industrial and commercial businesses to meet the growing need of controlling peak energy usage, power quality and environmental problems. BESS provide electric utilities with alternatives to conventional storage technologies, such as pumped hydro. As a generation resource, a BESS can store off-peak energy and provide power when it is needed. As a distribution resource, a BESS can defer or possibly eliminate the need for new transmission or distribution lines, resulting in cost savings and greater asset utilisation. The incorporation of battery storage with renewable energy generators will provide greater grid stability and reliability, thus allowing increased use of these resources. In industrial and commercial applications, BESS is a controllable demand-side management option that can provide industrial manufacturing companies and commercial customers improved power quality, uninterruptible power, and energy management capability. This capability provides for power demand reduction and peak-saving by storing lower cost energy at night and using it during peak hours of the day when energy costs typically are much higher, while simultaneously protecting most economically critical and sensitive of customer loads by providing uninterruptible power supply and active harmonic filtering. This paper describes the current state-of-the-art BESS, including a brief description of the most recently commissioned 20 MW BESS in Puerto Rico. The paper also discusses the future potential of battery energy systems utilising electrical vehicle batteries, and research work at the Hong Kong Polytechnic University in developing advanced energy storage systems.
{"title":"Power management solutions for energy management, power quality and environment using battery energy storage systems","authors":"D. Sutanto","doi":"10.1109/PEDS.1999.794528","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794528","url":null,"abstract":"Summary form only as given. The emergency of new breeds of power electronics and improved battery technology has created renewed interests in battery energy storage system (BESS). BESS is a modern cost-effective solution that can help both electric utilities and industrial and commercial businesses to meet the growing need of controlling peak energy usage, power quality and environmental problems. BESS provide electric utilities with alternatives to conventional storage technologies, such as pumped hydro. As a generation resource, a BESS can store off-peak energy and provide power when it is needed. As a distribution resource, a BESS can defer or possibly eliminate the need for new transmission or distribution lines, resulting in cost savings and greater asset utilisation. The incorporation of battery storage with renewable energy generators will provide greater grid stability and reliability, thus allowing increased use of these resources. In industrial and commercial applications, BESS is a controllable demand-side management option that can provide industrial manufacturing companies and commercial customers improved power quality, uninterruptible power, and energy management capability. This capability provides for power demand reduction and peak-saving by storing lower cost energy at night and using it during peak hours of the day when energy costs typically are much higher, while simultaneously protecting most economically critical and sensitive of customer loads by providing uninterruptible power supply and active harmonic filtering. This paper describes the current state-of-the-art BESS, including a brief description of the most recently commissioned 20 MW BESS in Puerto Rico. The paper also discusses the future potential of battery energy systems utilising electrical vehicle batteries, and research work at the Hong Kong Polytechnic University in developing advanced energy storage systems.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"346 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124272470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792822
K. Satoh, M. Yamamoto, K. Morishita, Y. Yamaguchi, H. Iwamoto
GCT (gate commutated turn-off thyristor) is a new high power device with snubberless turn-off operation which was developed in the mid-1990s, and is growing up to be the main device instead of GTO (gate turn-off thyristor) for high power application. For PWM current source inverters used in AC drive, symmetrical GCT with reverse blocking characteristics are expected. However, the symmetrical structure generally gives smaller turn-off capability compared with asymmetrical GCT, which has already been developed. This paper presents new GCT technologies, characteristics of 6 kV/4 kA symmetrical GCT and comparison of loss between current source inverter and voltage source inverter by using GCT.
{"title":"High power symmetrical GCT for current source inverter","authors":"K. Satoh, M. Yamamoto, K. Morishita, Y. Yamaguchi, H. Iwamoto","doi":"10.1109/PEDS.1999.792822","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792822","url":null,"abstract":"GCT (gate commutated turn-off thyristor) is a new high power device with snubberless turn-off operation which was developed in the mid-1990s, and is growing up to be the main device instead of GTO (gate turn-off thyristor) for high power application. For PWM current source inverters used in AC drive, symmetrical GCT with reverse blocking characteristics are expected. However, the symmetrical structure generally gives smaller turn-off capability compared with asymmetrical GCT, which has already been developed. This paper presents new GCT technologies, characteristics of 6 kV/4 kA symmetrical GCT and comparison of loss between current source inverter and voltage source inverter by using GCT.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124301885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.794539
Y. Nishida
This paper presents a 12-pulse diode rectifier of capacitor input type consisting of the conventional three-phase bridge 6-pulse diode rectifier with an auxiliary circuit. Although the auxiliary circuit consists of an autotransformer with very low kVA and two auxiliary diodes with very low rating, it plays the role to increase operation pulse number to 12. As a result, harmonics of the input line currents are greatly reduced and the THD is reduced to a quarter of the conventional 6-pulse rectifier. Since the new rectifier does not consist of a self-turn-off device nor a controller, the proposed scheme results in a compact, reliable and efficient solution to obtain uncontrolled DC-voltage from the utility without harmonic pollution. In this paper, the unique arrangement and particular operation of the auxiliary circuit are introduced. Then, experimental results are shown to confirm the validity of the theory.
{"title":"A 12-pulse diode rectifier using 3-phase bridge 6-pulse diode rectifier with 2 additional diodes and an auto-transformer","authors":"Y. Nishida","doi":"10.1109/PEDS.1999.794539","DOIUrl":"https://doi.org/10.1109/PEDS.1999.794539","url":null,"abstract":"This paper presents a 12-pulse diode rectifier of capacitor input type consisting of the conventional three-phase bridge 6-pulse diode rectifier with an auxiliary circuit. Although the auxiliary circuit consists of an autotransformer with very low kVA and two auxiliary diodes with very low rating, it plays the role to increase operation pulse number to 12. As a result, harmonics of the input line currents are greatly reduced and the THD is reduced to a quarter of the conventional 6-pulse rectifier. Since the new rectifier does not consist of a self-turn-off device nor a controller, the proposed scheme results in a compact, reliable and efficient solution to obtain uncontrolled DC-voltage from the utility without harmonic pollution. In this paper, the unique arrangement and particular operation of the auxiliary circuit are introduced. Then, experimental results are shown to confirm the validity of the theory.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125561975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-07-27DOI: 10.1109/PEDS.1999.792823
Duan Shanxu, Meng Yu, X. Jian, K. Yong, Chen Jian
The control technique of a parallel operation system of voltage source inverters with other inverters or with utility source has been applied in many fields, especially in uninterruptible power supply (UPS). The multi-module UPS can flexibly implement expansion of power system capacities. Furthermore, it can be used to build up a parallel redundant system in order to improve the reliability of whole power system operation. This paper analyses voltage and current status of a voltage source inverter in parallel, as well as the principle of parallel redundant system. Several control strategies according to the load-sharing problem in parallel control systems are also presented, from which the research of distributed-logic-control to realize parallel operation of four 3 kVA UPSs based on TMS320F240, a kind of real time digital signal processor (DSP), is discussed and proposed in detail.
{"title":"Parallel operation control technique of voltage source inverters in UPS","authors":"Duan Shanxu, Meng Yu, X. Jian, K. Yong, Chen Jian","doi":"10.1109/PEDS.1999.792823","DOIUrl":"https://doi.org/10.1109/PEDS.1999.792823","url":null,"abstract":"The control technique of a parallel operation system of voltage source inverters with other inverters or with utility source has been applied in many fields, especially in uninterruptible power supply (UPS). The multi-module UPS can flexibly implement expansion of power system capacities. Furthermore, it can be used to build up a parallel redundant system in order to improve the reliability of whole power system operation. This paper analyses voltage and current status of a voltage source inverter in parallel, as well as the principle of parallel redundant system. Several control strategies according to the load-sharing problem in parallel control systems are also presented, from which the research of distributed-logic-control to realize parallel operation of four 3 kVA UPSs based on TMS320F240, a kind of real time digital signal processor (DSP), is discussed and proposed in detail.","PeriodicalId":254764,"journal":{"name":"Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125765937","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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