No. 1320
	Power capacitors and the improvement technology of electric power quality
	Investigating R&D Committee of power capacitors and the improvement technology of electric power quality
	Keyword : power capacitor, power factor, voltage fluctuation, harmonics, storage of electricity
	Power capacitors have contributed greatly to the effective use of electric power, such as network voltage adjustment, line loss reduction and power factor correction. And harmonic filters have contributed greatly to the power quality improvement. Then, by the ripe capacitor application technology and the development of power electronics, they have evolved into such static var compensators (SVC) and voltage dip compensators. In recent years, the fluctuation of voltage and frequency and the increase of harmonics , due to the rapid increase of renewable energy power such as PV and wind power have occurred, and additionally the over-lead power factor or the Ferranti effect due to increase the use of inverter technology in load devices and energy saving have occurred. The countermeasure to these issues by the changes of sources and loads in power systems has been requested for power capacitors and their applications. However, the utilization of capacitors with higher energy density such as electric double layer capacitor (EDLC) and the further progress in power electronics are enabling in much more effective use of renewable energy power and power quality improvement technology, and expansion of the application field, which harnessed the quick response. Considering these circumstances, in the technical report, while investigating the influence to power quality by the over-capacitor installation and by the change of power supply and load, and introducing the evolution and development by power capacitors and their applied technology, the left-behind subjects are described. Moreover, the present basic technology about network voltage adjustment, line loss reduction, power factor correction and harmonic filters are arranged.
	©2007. The Institute of Electrical Engineers of Japan