By HDK / Published on Tue, 2009-08-25 08:37
Power electronics is an innovative and expanding area in electrical engineering. Recent advances in high power devices permit the control and flow of electric energy efficiently. The digital nature of power switching devices makes the control of electric power switching circuits convenient with the use of digital signal processors. Power electronics has widespread applications in today’s industry such as in power supplies, variable speed drives, automotives, marine, etc.
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By HDK / Published on Mon, 2009-07-27 11:25
[In partnership with VEI]
Various energy sources generate electrical energy in a form that cannot simply be injected into the electricity network, including photovoltaic panels, microturbines, batteries and fuel cells. These sources generate either DC voltage or AC voltage with variable frequency and/or an amplitude or voltage not compliant with the electricity network. To connect such sources to the electricity network nevertheless, a power electronic inverter or transformer must be used.
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By Hans De Keulenaer / Published on Thu, 2009-03-05 09:12
Renewable energy portfolio standards will require higher penetration of renewable energy sources in the years ahead. Such large-scale integration of renewable generation sources into the electric power grid is raising critical issues.
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By Hans De Keulenaer / Published on Mon, 2008-09-22 09:56
Measurement investigations have been carried out for commutator dc motor with internal asymmetries. Construction of considered motor enables to realize the breaking of one rotor coil and shorting of two groups of rotor coils. Each group contains three rotor coils. The basis of study were signals: current and voltage of field winding, current and voltage of armature winding and velocity of the rotor. The presented in this paper results of spectral analysis of signals create new possibilities for diagnostics of commutator dc motor.
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By Sergio Ferreira / Published on Thu, 2008-06-26 15:54
Power supply systems and power industry in contemporary world are significant, if not the most important, sectors of any company, each country and the entire world economy.
The continuity of power delivery is of fundamental importance for all customers, particularly for the industry and public sector.That's why the issue of on-line monitoring and measuring of power consumption, electric power consumption, and selected power quality parameters becomes more and more important. The information and characteristics contained in this paper depict the capabilities of intelligent building systems.
The presented applications of intelligent building systems have an opportunity of significant development particularly with prospects connecting them with local networks in buildings or industrial facilities (Ethernet network) and global Internet web. That way the data on building power supply can be remotely analyzed, practically throughout the world.
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By Bruno De Wachter / Published on Thu, 2008-05-22 05:30
Electric drives for ships and planes
Trains are increasingly electrified, electric motorbikes are booming in Asia, and the all-electric car might be close to mass production. Some people are openly suggesting that water and air transport could become electrically powered as well, completing the move to an 'all electric society'. What are the chances of this vision becoming a reality? Ships with electric propulsion systems already existed at the beginning of the 20th century and are currently ready for a (limited) revival. However, development in powering large aircraft by electric propulsion is much less in evidence.
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By Isabelle Heriakian / Published on Mon, 2008-02-18 19:21
Andreas Sumper from CITCEA, The Centre of Technological Innovation in Static Converters and Drives, which belongs to the Politechnical University of Catalonia (UPC) presents this center of research and innovation.
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By Isabelle Heriakian / Published on Thu, 2007-07-12 00:00
In PV grid connected power conditioners, usually both stepping-up the PV array voltage, and stepping-down the dc bus voltage for injection of a sinusoidal current to the grid is required. In this paper the design procedure of Z-source converter as a single phase PV grid connected transformer-less inverter is presented. The converter has one switch less than the conventional two stage power conditioner, which leads to reduction of cost. An optimum modulation pattern for the switches is proposed, and the low frequency ripple of the converter is modeled.
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By Isabelle Heriakian / Published on Wed, 2007-07-11 00:00
This paper presents analytical and computer aided investigations on photovoltaic (PV) - generators connected to DC/DC converters for module integrated inverters. It shows the controllability and describes how to design the converters regarding requirements such as a wide variable input voltage range, a constant output voltage and a variable transferred power, depending on temperature, solar radiation and the PV-generator itself.
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By Isabelle Heriakian / Published on Mon, 2005-02-07 18:40
It is common to find the inexpensive but robust electric power rectification method to fulfil the demands of clean power conversion. The Vienna rectifier structure is one of the hopeful construction to fulfil these demands. It may be classified as the Clean Power Converter. It lets us obtain PFC rectification in simpler than the PWM converter system. The Vienna rectifier has three control points. In addition the Vienna rectifier is the three voltage level system with less current ripples than in the case of the PWM converter. However, it has some disadvantages.
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