RT Book, Whole
T1 Power Quality
A1 Eberhard, Andreas
K1 Energía eléctrica - Calidad
AB Electrical power is becoming one of the most dominant factors in our society. Powergeneration, transmission, distribution and usage are undergoing signifi cant changesthat will aff ect the electrical quality and performance needs of our 21st century industry.One major aspect of electrical power is its quality and stability – or so called PowerQuality.The view on Power Quality did change over the past few years. It seems that PowerQuality is becoming a more important term in the academic world dealing with electricalpower, and it is becoming more visible in all areas of commerce and industry, becauseof the ever increasing industry automation using sensitive electrical equipmenton one hand and due to the dramatic change of our global electrical infrastructure onthe other.For the past century, grid stability was maintained with a limited amount of majorgenerators that have a large amount of rotational inertia. And the rate of change ofphase angle is slow. Unfortunately, this does not work anymore with renewable energysources adding their share to the grid like wind turbines or PV modules. Although thebasic idea to use renewable energies is great and will be our path into the next century,it comes with a curse for the power grid as power fl ow stability will suff er.It is not only the source side that is about to change. We have also seen signifi cantchanges on the load side as well. Industry is using machines and electrical productssuch as AC drives or PLCs that are sensitive to the slightest change of power quality,and we at home use more and more electrical products with switching power suppliesor starting to plug in our electric cars to charge batt eries. In addition, many of ushave begun installing our own distributed generation systems on our rooft ops usingthe latest solar panels. So we did look for a way to address this severe impact on ourdistribution network. To match supply and demand, we are about to create a new, intelligentand self-healing electric power infrastructure. The Smart Grid. The basic ideais to maintain the necessary balance between generators and loads on a grid. In otherwords, to make sure we have a good grid balance at all times. But the key question thatyou should ask yourself is: Does it also improve Power Quality? Probably not!Further on, the way how Power Quality is measured is going to be changed. Traditionally,each country had its own Power Quality standards and defi ned its own powerquality instrument requirements. But more and more international harmonization effortscan be seen. Such as IEC 61000-4-30, which is an excellent standard that ensuresthat all compliant power quality instruments, regardless of manufacturer, will produce of measurement instruments so that they can also be used in volume applications andeven directly embedded into sensitive loads. But work still has to be done. We still usePower Quality standards that have been writt en decades ago and don’t match today’stechnology any more, such as fl icker standards that use parameters that have been defined by the behavior of 60-watt incandescent light bulbs, which are becoming extinct.Almost all experts are in agreement - although we will see an improvement in meteringand control of the power fl ow, Power Quality will suff er. This book will give anoverview of how power quality might impact our lives today and tomorrow, introducenew ways to monitor power quality and inform us about interesting possibilities tomitigate power quality problems.Regardless of any enhancements of the power grid, “Power Quality is just compatibility”like my good old friend and teacher Alex McEachern used to say.Power Quality will always remain an economic compromise between supply and load.The power available on the grid must be suffi ciently clean for the loads to operate correctly,and the loads must be suffi ciently strong to tolerate normal disturbances on thegrid.
PB Intech
SN 978-953-307-180-0
YR 2011
FD 2011
LK http://hdl.handle.net/10630/4677
UL http://hdl.handle.net/10630/4677
LA eng
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 24 ene 2026