The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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design of Power Converter in dfig wind turbine with enhanced system level reliability
European Conference on Cognitive Ergonomics, 2017Co-Authors: Dao Zhou, Guanguan Zhang, Frede BlaabjergAbstract:With the increasing penetration of wind Power, reliable and cost-effective wind energy production are of more and more importance. As one of the promising configurations, the doubly-fed induction generator based partial-scale wind Power Converter is still dominating in the existing wind farms, and its reliability assessment is studied considering the annual wind profile. According to an electro-thermal stress evaluation, by using lifetime models and Monte Carlo based variation analysis, the time-to-failure distribution of the key Power semiconductors is predicted. Aiming for the system-level reliability analysis, a Weibull distribution based component-level model is applied by using a reliability block diagram. A case study of a 2 MW wind Power Converter shows that the optimal selection of Power module may be different viewed from the reliability perspective compared to the electrical stress margin. It can be seen that the B 1 lifetime of the grid-side Converter and the rotor-side Converter deviates a lot by considering the electrical stresses, while they become more balanced by using an optimized reliable design. The system-level lifetime significantly increases with an appropriate design of the back-to-back Power Converters.
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fundamental frequency and load varying thermal cycles effects on lifetime estimation of dfig Power Converter
Microelectronics Reliability, 2017Co-Authors: Guanguan Zhang, Dao Zhou, Jian Yang, Frede BlaabjergAbstract:Abstract In respect to a Doubly-Fed Induction Generator (DFIG) system, its corresponding time scale varies from microsecond level of Power semiconductor switching to second level of the mechanical response. In order to map annual thermal profile of the Power semiconductors, different approaches have been adopted to handle the fundamental-frequency thermal cycles and load-varying thermal cycles. Their effects on lifetime estimation of the Power device in the Back-to-Back (BTB) Power Converter are evaluated.
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pi and fuzzy control strategies for high voltage output dc dc boost Power Converter hardware implementation and analysis
International Conference on Environment and Electrical Engineering, 2016Co-Authors: Sanjeevikumar Padmanaban, Frede Blaabjerg, Luigi Martirano, Pierluigi Siano, Zbigniew Leonowicz, Kiran Pandav MarotiAbstract:This paper presents the control strategies by Proportional-Integral (P-I) and Fuzzy Logic (FL) for a DC-DC boost Power Converter for high output voltage configuration. Standard DC-DC Converters are traditionally used for high voltage direct current (HVDC) Power transmission systems. But, lack its performances in terms of efficiency, reduced transfer gain and increased cost with sensor units. Moreover, the internal self-parasitic components reduce the output voltage and efficiency of classical high voltage Converters (HVC). This investigation focused on extra high-voltage (EHV) DC-DC boost Power Converter with inbuilt voltage-lift technique and overcome the aforementioned deficiencies. Further, the control strategy is adapted based on proportional-integral (P-I) and fuzzy logic, closed-loop controller to regulate the outputs and ensure the performances. Complete hardware prototype of EHV Converter is realized and experimental tasks are set out with digital signal processor (DSP) TMS320F2812 under different perturbation conditions. Observed set of results is provided and shown good conformity with developed hypothetical predictions.
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Lifetime estimation of electrolytic capacitors in a fuel cell Power Converter at various confidence levels
2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC), 2016Co-Authors: Dao Zhou, Huai Wang, Frede BlaabjergAbstract:DC capacitors in Power electronic Converters are a major constraint on improvement of the Power density and the reliability. In this paper, according to the degradation data of tested capacitors, the lifetime model of the component is analyzed at various confidence levels. Then, the mission profile based lifetime expectancy of the individual capacitor and the capacitor bank is estimated in a fuel cell backup Power Converter operating in both standby mode and operation mode. The lifetime prediction of the capacitor banks at different confidence levels is also obtained.
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evaluation and design tools for the reliability of wind Power Converter system
Journal of Power Electronics, 2015Co-Authors: Dao Zhou, Frede BlaabjergAbstract:As a key part in the wind turbine system, the Power electronic Converter is proven to have high failure rates. At the same time, the failure of the wind Power Converter is becoming more unacceptable because of the quick growth in capacity, remote locations to reach, and strong impact to the Power grid. As a result, the correct assessment of reliable performance for Power electronics is a crucial and emerging need; the assessment is essential for design improvement, as well as for the extension of Converter lifetime and reduction of energy cost. Unfortunately, there still exists a lack of suitable physic-of-failure based evaluation tools for a reliability assessment in Power electronics. In this paper, an advanced tool structure which can acquire various reliability metrics of wind Power Converter is proposed. The tool is based on failure mechanisms in critical components of the system and mission profiles in wind turbines. Potential methodologies, challenges, and technology trends involved in this tool structure are also discussed. Finally, a simplified version of the tool is demonstrated on a wind Power Converter based on Double Fed Induction Generator system. With the proposed tool structure, more detailed information of reliability performances in a wind Power Converter can be obtained before the Converter can actually fail in the field and many potential research topics can also be initiated.
Joao P S Catalao - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Power Converter topologies and control strategies for the harmonic performance of variable speed wind turbine generator systems
Energy, 2011Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:Power Converters play a vital role in the integration of wind Power into the electrical grid. Variable-speed wind turbine generator systems have a considerable interest of application for grid connection at constant frequency. In this paper, comprehensive simulation studies are carried out with three Power Converter topologies: matrix, two-level and multilevel. A fractional-order control strategy is studied for the variable-speed operation of wind turbine generator systems. The studies are in order to compare Power Converter topologies and control strategies. The studies reveal that the multilevel Converter and the proposed fractional-order control strategy enable an improvement in the Power quality, in comparison with the other Power Converters using a classical integer-order control strategy.
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Power Converter topologies for wind energy conversion systems integrated modeling control strategy and performance simulation
Renewable Energy, 2010Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:Abstract This paper presents new integrated model for variable-speed wind energy conversion systems, considering a more accurate dynamic of the wind turbine, rotor, generator, Power Converter and filter. Pulse width modulation by space vector modulation associated with sliding mode is used for controlling the Power Converters. Also, Power factor control is introduced at the output of the Power Converters. Comprehensive performance simulation studies are carried out with matrix, two-level and multilevel Power Converter topologies in order to adequately assert the system performance. Conclusions are duly drawn.
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fractional order control and simulation of wind energy systems with pmsg full Power Converter topology
Energy Conversion and Management, 2010Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:This paper presents a new integrated model for the simulation of wind energy systems. The proposed model is more realistic and accurate, considering a variable-speed wind turbine, two-mass rotor, permanent magnet synchronous generator (PMSG), different Power Converter topologies, and filters. Additionally, a new control strategy is proposed for the variable-speed operation of wind turbines with PMSG/full-Power Converter topology, based on fractional-order controllers. Comprehensive simulation studies are carried out with matrix and multilevel Power Converter topologies, in order to adequately assert the system performance in what regards the quality of the energy injected into the electric grid. Finally, conclusions are duly drawn.
David J Perreault - One of the best experts on this subject based on the ideXlab platform.
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merged two stage Power Converter with soft charging switched capacitor stage in 180 nm cmos
IEEE Journal of Solid-state Circuits, 2012Co-Authors: Robert C N Pilawapodgurski, David J PerreaultAbstract:In this paper, we introduce a merged two-stage dc-dc Power Converter for low-voltage Power delivery. By separating the transformation and regulation function of a dc-dc Power Converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or Power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc Converter has been developed in 180 nm CMOS. The Converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.
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Merged two-stage Power Converter with soft charging switched-capacitor stage in 180 nm CMOS
IEEE Journal of Solid-State Circuits, 2012Co-Authors: Robert Carl Nikolai Pilawa-podgurski, David J PerreaultAbstract:In this paper, we introduce a merged two-stage dc-dc Power Converter for low-voltage Power delivery. By separating the transformation and regulation function of a dc-dc Power Converter into two stages, both large voltage transformation and high control bandwidth can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or Power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc Converter has been developed in 180 nm CMOS. The Converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.
Rui Melicio - One of the best experts on this subject based on the ideXlab platform.
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comparative study of Power Converter topologies and control strategies for the harmonic performance of variable speed wind turbine generator systems
Energy, 2011Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:Power Converters play a vital role in the integration of wind Power into the electrical grid. Variable-speed wind turbine generator systems have a considerable interest of application for grid connection at constant frequency. In this paper, comprehensive simulation studies are carried out with three Power Converter topologies: matrix, two-level and multilevel. A fractional-order control strategy is studied for the variable-speed operation of wind turbine generator systems. The studies are in order to compare Power Converter topologies and control strategies. The studies reveal that the multilevel Converter and the proposed fractional-order control strategy enable an improvement in the Power quality, in comparison with the other Power Converters using a classical integer-order control strategy.
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Power Converter topologies for wind energy conversion systems integrated modeling control strategy and performance simulation
Renewable Energy, 2010Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:Abstract This paper presents new integrated model for variable-speed wind energy conversion systems, considering a more accurate dynamic of the wind turbine, rotor, generator, Power Converter and filter. Pulse width modulation by space vector modulation associated with sliding mode is used for controlling the Power Converters. Also, Power factor control is introduced at the output of the Power Converters. Comprehensive performance simulation studies are carried out with matrix, two-level and multilevel Power Converter topologies in order to adequately assert the system performance. Conclusions are duly drawn.
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fractional order control and simulation of wind energy systems with pmsg full Power Converter topology
Energy Conversion and Management, 2010Co-Authors: Rui Melicio, V M F Mendes, Joao P S CatalaoAbstract:This paper presents a new integrated model for the simulation of wind energy systems. The proposed model is more realistic and accurate, considering a variable-speed wind turbine, two-mass rotor, permanent magnet synchronous generator (PMSG), different Power Converter topologies, and filters. Additionally, a new control strategy is proposed for the variable-speed operation of wind turbines with PMSG/full-Power Converter topology, based on fractional-order controllers. Comprehensive simulation studies are carried out with matrix and multilevel Power Converter topologies, in order to adequately assert the system performance in what regards the quality of the energy injected into the electric grid. Finally, conclusions are duly drawn.
Jaber Abu A Qahouq - One of the best experts on this subject based on the ideXlab platform.
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single perturbation cycle online battery impedance spectrum measurement method with closed loop control of Power Converter
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Jaber Abu A QahouqAbstract:This paper presents a method for an online real-time electrochemical impedance spectroscopy (EIS) measurement of batteries using closed-loop control of Power Converter. Unlike the previously proposed method which allows the measurement of the ac impedance for a single frequency, the presented method in this paper allows for obtaining the EIS for a spectrum of frequencies by using the information included in a single perturbation cycle, or a few cycles of perturbation to obtain a more accurate EIS with a very wide frequency range. This will result in faster EIS measurement for a spectrum of frequencies and under the same battery operating conditions. The presented method utilizes closed-loop control operation for the EIS measurement functionality, which allows for better control of the output voltage and for upgrading the concept to be able to achieve no added perturbation ripple at the output of the system. The presented online real-time EIS measurement method utilizes a Power Converter with closed-loop control in order to create an output voltage step-function perturbation at a given frequency to generate battery voltage and current responses. By applying Fourier analysis to these responses, an EIS can be obtained for a range of frequencies equal or higher than the perturbation frequency of the step function. In addition, this paper presents a method to eliminate the added perturbation ripple when two or more Power Converters are used. The theoretical basis and experimental prototype results are provided to illustrate and validate the presented method.
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distributed photovoltaic solar system architecture with single Power inductor single Power Converter and single sensor single maximum Power point tracking controller
Iet Power Electronics, 2014Co-Authors: Jaber Abu A Qahouq, Yuncong JiangAbstract:This study presents a distributed photovoltaic (PV) solar system architecture with a single-Power inductor, single-Power Converter and single maximum Power point tracking (MPPT) controller that only requires one sensor. This PV architecture is able to perform MPPT for a multichannel distributed PV system at panel level, cell group level and/or single cell level under mismatching and partial shading conditions. The single Power stage is a multiple-input single-inductor boost Power Converter which operates in continuous conduction mode. This work targets the high-cost and high-complexity issues of module integrated Converter (MIC) and sub-MIC PV architectures, which affect their practicality in many applications. The concept and operation of the single-Power-Converter single-controller single-sensor MPPT architecture is presented, analysed and verified by results obtained from a proof-of-concept experimental prototype.
