By Hans De Keulenaer / Published on Tue, 2005-05-24 00:00
UPS manufacturers follow the IT culture, used to deal with modular and versatile equipment. A question then arises : should the power protection be distributed (installed in the rack) or centralized (in an electrical room). A centralized system is faster to implement. It requires a cheaper and smaller area per kW. Rightsizing centralized power from the beginning facilitates "plug-and-play" IT installations. The efficiency is better optimized, centralized UPS having lower losses cooled by cheaper air-conditionning.
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By Hans De Keulenaer / Published on Sun, 2005-05-22 00:00
In modern distribution grids, more distributed generation technologies emerge. The most far-going implementations are ‘energy islands’ with a high degree of autonomy from the central grid. This paper considers different technological barriers that emerge with increasing penetration of such systems: power quality, control problems, safety issues, environmental aspects, the availability of primary energy resources and economic aspects.
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By Hans De Keulenaer / Published on Fri, 2005-05-20 00:00
Wind generation peculiarities introduce new uncertainty factors in the operation of electric power systems. This paper tries to clarify this situation, remarking the main effects involved, reviewing the current state of wind generation technologies, and analyzing the solutions that can be applied. It is shown how the capabilities of most current technologies of variable speed wind turbine generation systems can make compatible a suitable operation of the power system with a high level of wind generation penetration.
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By Hans De Keulenaer / Published on Wed, 2005-05-18 00:00
Process hardening offers the prospect of solving vexing power quality problems without incurring prohibitive costs and making a huge capital investment. The technique presented in this paper focuses on identifying the specific types of PQ issues that a facility's process is experiencing, identifying the specific elements within the process that are susceptible, and then surgically dealing with those elements either by replacing them with more robust alternatives, or by some how isolating them from the vagaries of the grid.
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By Hans De Keulenaer / Published on Mon, 2005-05-16 14:40
If one thing can be said about the energy market, it is that ‘times are changing’. Our present day grid, with its historically defined structure, will also have to change to cope with the new demands of the future. As will be discussed later on, this transformation can head in different directions.
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