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1
Content available Analysis of loss distribution of conventional boost, Z-source and Y-source converters for wide power and voltage range
Gadalla B. S., Schaltz E., Siwakoti Y., Blaabjerg F.
Transactions on Environment and Electrical Engineering
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2017
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Vol. 2, No. 1
1--9
EN
Boost converters are needed in many applications which require the output voltage to be higher than the input voltage. Recently, boost type converters have been applied for industrial applications, and hence it has become an interesting topic of research. Many researchers proposed different impedance source converters with their unique advantages as having a high voltage gain in a small range of duty cycle ratio. However, the thermal behaviour of the semiconductor devices and passive elements in the impedance source converter is an important issue from a reliability point of view and it has not been investigated yet. Therefore, this paper presents a comparison between the conventional boost, the Z-source, and the Y-source converters based on a thermal evaluation of the semiconductors. In addition, the three topologies are also compared with respect to their efficiency. In this study the results show that the boost converter has higher efficiency than the Z-source and Y-source converter for these specific voltage gain of 2 and 4. The operational principle, mathematical derivations, simulation results and final comparisons are presented in this paper.
2
Content available Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters
Wu W., Huang M., Blaabjerg F.
Archives of Electrical Engineering
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2014
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Vol. 63, nr 1
63-79
EN
An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis.
3
Predicting Harmonics by Simulations. A Case Study for High Power Adjustable Speed Drives
Asiminoaei L., Hansen S., Blaabjerg F.
Electrical Power Quality and Utilisation. Magazine
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2006
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Vol. 2, iss. 1
65--75
EN
This paper describes the measurements and simulations of harmonics from adjustable speed drives in a 1.2 MVA Heat Power Station application. The simulations are done in two ways, one by Pspice circuit simulator and the other by a custom developed harmonic toolbox. It is proven that Pspice is more flexible and offers a better precision in estimation, but in turn the developed toolbox is more practical and relatively accurate for many useful evaluations. Both harmonic simulations are validated by real measurements for the given plant, within an error of 5 % between the measured and the simulated data. Due to a very close match, the simulators are used further to analyze different harmonic mitigation solutions. The best solution found by simulations, for the given plant, is an advanced harmonic filter dedicated for adjustable speed drives, which is currently in the installation stage.
4
Content available remote Wind turbines - a cost effective power source
Chen Z., Blaabjerg F.
Przegląd Elektrotechniczny
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2004
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R. 80, nr 5
464-469
EN
The global electrical energy consumption is steadily rising and consequently, there is a 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. In this paper, firstly the basic principle of wind power conversion is briefed, then various configurations of wind turbine technology are presented. Finally, the developments and tends are discussed.
PL
Cafkowita konsumpcja energii stale wzrasta i dlatego istnieje potrzeba zwiększania mozliwosci generowania energii. Znaczącą wartością generowanej energii może być energia pozyskiwana ze źródeł odnawialnych. Turbiny wiatrowe, jako najbardziej efektywne kosztowo źródło konwersji energii mogq odgrywać znaczacą rolę w przyszłych systemach zasilania. W prezentowanej pracy przedstawiono podstawowe zasady konwersji energii wiatrowej, a następnie zaprezentowano różne konfiguracje turbin wiatrowych. Przedstawiono też dyskusję tendencji rozwojowych w tej dziedzinie.
5
Content available remote Oszczędności silnika dla napędów pomp i wentylatorów?
Kaźmierkowski M. P., Abrahamsen F., Pedersen J. K., Blaabjerg F.
Napędy i Sterowanie
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2000
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R. 2, nr 7/8
10--13
PL
Proces przyjazny środowisku naturalnemu, niskie koszty eksploatacji i zapewnienie komfortu ludziom - to cechy które powinny być zapewnione przez nowoczesne systemy technicznego wyposażenie budynków. Dlatego też, aby zapewnić optymalne parametry, coraz częściej w wyposażeniu budynków stosuje się automatyzację. Przemienniki częstotliwości do płynnej regulacji prędkości obrotowej wentylatorów i pomp to konieczność w systemach technicznego wyposażenia budynku ze względu na oszczędności energii. Ponadto urządzenia te mogą przejąć pewne funkcje kontrolne.
6
Content available remote Zajęcia projektowe bazą kształcenia innowacyjnego na Uniwersytecie w Aalborgu, Dania
Blaabjerg F., Pedersen J.K.
Przegląd Elektrotechniczny
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1999
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nr 1
16-18
7
Content available remote Międzynarodowy program profesorski ufundowany przez firmę Danfoss na uniwersytecie w Aalborgu - nowy model współpracy uczelni z przemysłem
Blaabjerg F., Pedersen J.K., Kaźmierkowski M.P.
Przegląd Elektrotechniczny
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1999
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nr 3
68-69
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