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      • Fuse Protection of IGBT Modules against Explosions

        Frede Blaabjerg,Florin Iov,Karsten Ries 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10

        The demand for protection of power electronic applications has during the last couple of years increased regarding the high-power IGBT modules Even with an active protection, a high power IGBT still has a risk of exhibiting a violent rupture in the case of a fault if IGBT Fuses do not protect it By introducing ruses into the circuit this will increase the circuit inductance and slight increase the over-voltage during the turn-off of the diode and the IGBT It is therefore vital when using fuses that the added inductance is kept at a minimum This paper discuss three issues regarding the IGBT Fuse protection First, the problem of adding inductance of existing High-Speed and new Typower fuses in DC-link circuit is treated, second a short discussion of the protection of the IGBT module is done, and finally, the impact of the high frequency loading on the current carrying capability of the fuses is presented.<br/>

      • SCIESCOPUSKCI등재

        A Power Electronics and Drives Curriculum with Project-oriented and Problem-based Learning: A Dynamic Teaching Approach for the Future

        Blaabjerg, Frede The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.4

        Power electronics Is an emerging technology New applications are added every year as well as the power handling capabilities are steadily increasing. The demands to the education of engineers in this field are also increasing. Basically the content of the curriculum should be more expanded without extra study time. This paper present a teaching approach which makes it possible very fast for the student to get in-deplh skills in this important area which is the problem-oriented and project-based learning. The trend and application of power electronics are illustrated. The necessary skills for power electronic engineers are outlined followed up by a discussion on how problem-oriented and project-based learning are implemented. A complete curriculum at Aalborg University is presented where different power electronics related projects at different study levels are carried out.

      • SCIESCOPUSKCI등재

        A Power Electronics and Dries Curriculum with Project-oriented and Problem-based Learming: A Dynamic Teaching Approach for the Future

        Frede Blaabjerg 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.4

        Power electronics is an emerging technology. New applications are added every year as well as the power handling capabilities are steadily increasing The demands to the education of engineers m this field are also increasing Basically the content of the curriculum should be more expanded without extra study time This paper present a teaching approach which makes it possible very fast for the student to get m-depth skills m this important area which is the problem-oriented and project-based learning. The trend and application of power electronics are illustrated The necessary skills for power electronic engineers are outlined followed up by a discussion on how problem-oriented and project-based learning are implemented A complete curriculum at Aalborg University is presented where different power electronics related projects at different study levels are carried out

      • Power Converters and Control of Renewable Energy Systems

        Frede Blaabjerg,Remus Teodorescu,Zhe Chen,Marco Liserre 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-

        The global electrical energy consumption is steadily rising and therefore a continous demand to increase the power generation capacity. A significant percentage of the required capacity increase can be based on renewable energy sources. Wind turbine technology, as the most cost effective renewable energy conversion system, will play an important part in our future energy supply. But other sources like microturbines, photovoltaics and fuel cell systems may also be serious contributors to the power supply. Characteristically, power electronics will be an efficient and important interface to the grid for the renewables and this paper will first briefly discuss three different alternative/renewable energy sources. Next, various configurations of small and medium power conversion topologies are presented including their control (mainly for PV-systems). Finally wind turbine configuration and their control are described.

      • SCIESCOPUSKCI등재

        Fuse Protection of IGBT Modules against Explosions

        Frede Blaabjerg,Florin Iov,Karsten Ries 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.2

        The demand for protection of power electronic applications has during the last couple of years increased regarding the high-power IGBT modules. Even with an active protection, a high power IGBT still has a risk of exhibiting a violent rupture in the case of a fault If IGBT Fuses do not protect it By introducing fuses unto the circuit this will increase the circuit inductance and slight increase the over-voltage during the turn-off of the diode and the IGBT It is therefore vital when using fuses that the added inductance is kept at a minimum This paper discuss three issues regarding the IGBT Fuse protection First, the problem of adding inductance of existing High-Speed and new Typower fuses in DC-link circuit is treated, second a short discussion of the protection of the IGBT module is done, and finally, the impact of the high frequency loading on the current carrying capability of the fuses is presented

      • Converter-level Reliability of Wind Turbine with Low Sample Rate Mission Profile

        Dao Zhou,Frede Blaabjerg 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

        The thermal dynamics of power semiconductors and power capacitors are closely related to the reliability and the cost of power electronic converter. However, the component loading in a wind turbine system is disturbed by many factors of the converter system, which is present at various time-constants from microseconds to years. In the case of a mission profile with 1-hour sample rate, the circuit model, loss model, and thermal model of the active power switches and passive capacitors are described and presented. The percentile lifetime of a single component can be predicted according to the long-term electro-thermal profile, and the Weibull function based time-to-failure distribution of the active component and passive component can be obtained. In a 2 MW wind turbine system, it can be seen that the dc-link capacitor bank dominates the converter-level reliability.

      • SCIESCOPUSKCI등재

        Definition of Powers and Power Quality Factors at a Point of Common Coupling in Single-Phase Systems and Three-Phase Systems

        Hyosung Kim,Frede Blaabjerg,Birgitte Bak-Jensen 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.1

        This paper proposes an unified definition of powers for various circuit conditions such as balanced/unbalanced, sinusoidal/non-sinusoidal, and linear/nonlinear, for single-phase systems and three-phase systems Conventional reactive power is more classified into an interactive power and an alternating power These powers are defined both m the time domain and the frequency domain consistently, and agree well with the conservation law Several important power quality factors are defined to measure and evaluate the power quality for the various circultc in the single-phase and three-phase systems. simulation results show the power quality factors can cvaluate and classify the various circuit conditions clearly

      • Definition of Power Quality Factors at The Point of Common Coupling in Single-Phase Systems and Three-Phase Systems

        Hyosung Kim,Frede Blaabjerg,Birgitte Bak-Jensen 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10

        This paper proposes an unified definition of powers for various circuit conditions such as balanced/unbalanced, sinusoidat/non-smusoidal, and linear/nonlinear, for single-phase systems and three-phase systems. Conventional reactive power is more classified into an interactive power and a scattering power. These powers are defined both in the time domain and the frequency domain consistently, and agree well with the conservation law. Several important power quality factors are defined to measure and evaluate the power quality for the various circuits in the single-phase and three-phase systems. Simulation results show the power quality factors can evaluate and classify the various circuit conditions clearly.<br/>

      • SCIESCOPUS

        Study and Handling Methods of Power IGBT Module Failures in Power Electronic Converter Systems

        Ui-Min Choi,Blaabjerg, Frede,Kyo-Beum Lee Institute of Electrical and Electronics Engineers 2015 IEEE transactions on power electronics Vol. No.

        <P>Power electronics plays an important role in a wide range of applications in order to achieve high efficiency and performance. Increasing efforts are being made to improve the reliability of power electronics systems to ensure compliance with more stringent constraints on cost, safety, and availability in different applications. This paper presents an overview of the major failure mechanisms of IGBT modules and their handling methods in power converter systems improving reliability. The major failure mechanisms of IGBT modules are presented first, and methods for predicting lifetime and estimating the junction temperature of IGBT modules are then discussed. Subsequently, different methods for detecting open- and short-circuit faults are presented. Finally, fault-tolerant strategies for improving the reliability of power electronic systems under field operation are explained and compared in terms of performance and cost.</P>

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