As the power electronics technology is widely used in the power system, it may also bring the DC component to the transformer operation, resulting in DC bias and may cause great harm to the transformer. In this articl...As the power electronics technology is widely used in the power system, it may also bring the DC component to the transformer operation, resulting in DC bias and may cause great harm to the transformer. In this article, the device to protect transformer from DC magnetic bias is designed. On the basis of load DC current, a magnetic bias protection device is developed by combination of current sensor, electric information collection circuit, signal filtering circuit, signal modulating circuits, fault feature judging circuit, automatic range tracking circuit, intelligent logic synthesis unit and implementation output circuit. By operating in temperature-rise test equipment in the high power electronic lab, the device is proved with reliability, high sensitivity and worthy of promotion and application.展开更多
In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio...In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio and desired frequency. The description of predictive control circuit of the CSMC is presented. Furthermore the simulation test results to confirm functionality of the proposed control strategy and converter properties under this strategy are shown.展开更多
The aim of this paper is to propose a flexible and accurate methodology for the evaluation of the BIPV （building integrated photovoltaic） potential on industrial building roofs. The use of more realistic and case sp...The aim of this paper is to propose a flexible and accurate methodology for the evaluation of the BIPV （building integrated photovoltaic） potential on industrial building roofs. The use of more realistic and case specific data obtained by accurate technical on-site audits is proved to be of significant importance in the reliability of the proposed methodology results. Moreover, the most recent PV market information is used, considering however that this factor is rapidly changing during the last years, owed to the vast growth of the PV sector. To this end, emphasis is given on the country of Greece, where besides the fact that there is an increase of PV installations; no progress has been met in the use of BIPV systems in the industrial sector, opposite to the situation met in other EU countries. Acknowledging the above, the proposed methodology is currently applied so as to evaluate the BIPV potential of a large industrial zone close to the Greek capital, Athens. The results of this study can be used by both other researchers, for similar evaluations, and energy policy makers, to support the clean energy production concept on the basis of BIPV systems in industrial areas.展开更多
Capacitive DC links are an important part in voltage source power electronic converters,which contribute to cost,size and failure rate on a considerable scale.With more and more stringent constraints brought by indust...Capacitive DC links are an important part in voltage source power electronic converters,which contribute to cost,size and failure rate on a considerable scale.With more and more stringent constraints brought by industrial applications,the capacitive DC links encounter reliability aspect challenges.This paper presents a review on the reliability design and improvement of capacitive DC links from three aspects:1)Quantitative reliability prediction for DC-link capacitors;2)Reliability-oriented design of passive DC-link capacitor banks;and 3)Advanced active DC links to exceed the limits of passive DC-link capacitors.Key solutions for each aspect are highlighted and discussed with case studies.This review serves to provide a picture of state-of-the-art research on the reliability design and improvement of capacitive DC links,highlight the key milestones in this area,and identify the corresponding challenges and future research directions.展开更多
The paper describes a method for automated small-signal frequency response analysis based on transient responseobtained using a generalpurpose simulation tool such as Spice.The method is based on using the simulation ...The paper describes a method for automated small-signal frequency response analysis based on transient responseobtained using a generalpurpose simulation tool such as Spice.The method is based on using the simulation toolto evaluate the converter impulse response.The main advantage of the proposed method as a design verification tool isthat frequency responses can be generated efficiently for any converter configuration and any model complexity supportedby the general-purpose simulator, Application examples are included to demonstrate very good correlation betweenthe generated responses and experimental data, and to compare the results with predictions of approximate analyticalmethods.展开更多
文摘As the power electronics technology is widely used in the power system, it may also bring the DC component to the transformer operation, resulting in DC bias and may cause great harm to the transformer. In this article, the device to protect transformer from DC magnetic bias is designed. On the basis of load DC current, a magnetic bias protection device is developed by combination of current sensor, electric information collection circuit, signal filtering circuit, signal modulating circuits, fault feature judging circuit, automatic range tracking circuit, intelligent logic synthesis unit and implementation output circuit. By operating in temperature-rise test equipment in the high power electronic lab, the device is proved with reliability, high sensitivity and worthy of promotion and application.
文摘In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio and desired frequency. The description of predictive control circuit of the CSMC is presented. Furthermore the simulation test results to confirm functionality of the proposed control strategy and converter properties under this strategy are shown.
文摘The aim of this paper is to propose a flexible and accurate methodology for the evaluation of the BIPV （building integrated photovoltaic） potential on industrial building roofs. The use of more realistic and case specific data obtained by accurate technical on-site audits is proved to be of significant importance in the reliability of the proposed methodology results. Moreover, the most recent PV market information is used, considering however that this factor is rapidly changing during the last years, owed to the vast growth of the PV sector. To this end, emphasis is given on the country of Greece, where besides the fact that there is an increase of PV installations; no progress has been met in the use of BIPV systems in the industrial sector, opposite to the situation met in other EU countries. Acknowledging the above, the proposed methodology is currently applied so as to evaluate the BIPV potential of a large industrial zone close to the Greek capital, Athens. The results of this study can be used by both other researchers, for similar evaluations, and energy policy makers, to support the clean energy production concept on the basis of BIPV systems in industrial areas.
文摘Capacitive DC links are an important part in voltage source power electronic converters,which contribute to cost,size and failure rate on a considerable scale.With more and more stringent constraints brought by industrial applications,the capacitive DC links encounter reliability aspect challenges.This paper presents a review on the reliability design and improvement of capacitive DC links from three aspects:1)Quantitative reliability prediction for DC-link capacitors;2)Reliability-oriented design of passive DC-link capacitor banks;and 3)Advanced active DC links to exceed the limits of passive DC-link capacitors.Key solutions for each aspect are highlighted and discussed with case studies.This review serves to provide a picture of state-of-the-art research on the reliability design and improvement of capacitive DC links,highlight the key milestones in this area,and identify the corresponding challenges and future research directions.
基金supported in part by the National Science Foundation under grant ECS-9703449
文摘The paper describes a method for automated small-signal frequency response analysis based on transient responseobtained using a generalpurpose simulation tool such as Spice.The method is based on using the simulation toolto evaluate the converter impulse response.The main advantage of the proposed method as a design verification tool isthat frequency responses can be generated efficiently for any converter configuration and any model complexity supportedby the general-purpose simulator, Application examples are included to demonstrate very good correlation betweenthe generated responses and experimental data, and to compare the results with predictions of approximate analyticalmethods.
