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EU poor power quality, an economic impact of €150bn April 28, 2008

Posted by Hans De Keulenaer in power quality.
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Jonathan Manson presents the results of a survey conducted by the European Copper Institute (ECI) into the consequences for EU industry of poor power quality. These add up to €150bn annually, are mainly experienced by industry and caused by power interruptions (dips, surges, transients and short interruptions). Call for action is made to use of the significant and disturbing conclusions drawn from the analysis that has been carried out.

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Multiple Power Quality Supply System 1st in Japan March 31, 2008

Posted by Hans De Keulenaer in electricity, power quality, reliability, security, storage, technology.
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In this interview, Keiichi Hirose from NTT Facilities, presents the first trial to take place in Japan in the area of power quality concepts and solutions. This field demonstration of a multiple power quality supply system is leaded by NTT Facilities. It has developed and installed a multiple power quality supply system that has the capability to feed four classes of alternative current (AC) and one of direct current (DC) power while meeting various customer requirements. The system also has three types of distributed generator (DG): gas engine sets, fuel cells, and photovoltaic panels. NTT Facilities started the project in Fiscal Year (FY) 2004 and plans to continue it for four years. A review of the project’s first three years was done @EPQU’07 conference.

Ageing networks: consume, prolong or replace January 10, 2007

Posted by Hans De Keulenaer in distribution, power quality, reliability.
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By Arjen G Jongepier, KEMA Consulting

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The components of electricity networks are ageing. It is expected that within a horizon of 15 years, the performance will deteriorate significantly, while the costs for operating the networks will increase enormously. The main problem is that a significant part of the population of the assets is installed in the same period, resulting in a highly concentrated number of failures in a short time. The currently applied replacement strategy has to be revisited, in order to accommodate the effects of ageing assets: higher maintenance costs, high failure rates, and a steep increase of capital expenditure (CAPEX).

Methods like long-term simulation, multi-criteria decision-making under uncertainty, critical asset identification, condition assessment, and advanced statistics for the extrapolation of condition assessments of representative samples of assets should be applied. By using these methodologies in a smart and integrated way, costs and performance can be kept at an acceptable level

Increasing the efficiency and reliability of electrical installations through fast reactive power compensation January 2, 2007

Posted by Hans De Keulenaer in power quality, webinar.
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Date: March 29, 2007
Speaker: Dr Kurt Schipman, ABB Power Quality Products

Morning session: 10h00 – 11h00 Europe Daylight Time
Afternoon session: 17h00 – 18h00 Europe Daylight Time
(webinars are free of charge, but prior registration is required)

This webinar reviews the concept of reactive power and highlights problems that can occur if too much reactive power is drawn from the supply system. Depending on the load type (slowly or fast varying, small or large power loads) and the network (weak or strong networks, harmonics present or not), different phenomena can occur; from simply putting extra stress on supply cables to power outages bringing production lines to standstill. It is shown that for different applications different reactive power compensation solutions must be applied – special attention is paid to fast reactive power compensators and their use. Selecting the right solution can bring substantial (energy) savings to the users.

Voltage fluctuation caused by PV Systems April 23, 2006

Posted by Hans De Keulenaer in photovoltaics, power quality, renewable electricity.
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An important effect on the distribution system

The output of photovoltaic (PV) systems is variable. It has daily and seasonal variations according to the position of the sun. In moderate climates, short term fluctuations in solar irradiance caused by moving clouds are just as important. What is the impact of these variations on the voltage level of the distribution grid? A major question bearing future large-scale application of embedded PV Systems in mind.

A new paper by KU Leuven investigates this impact. The input consists of pseudorandom time series of solar irradiance values, based on measurements. Power-flow calculations determine the impact of solar irradiance variations on the grid voltage. The results allow assessing in which case super-capacitors to mitigate fluctuations are worth the cost.