| Abstract |
Power quality issue is becoming more and more important due to wide spread use of
computerized and power electronic equipment, which requires high quality power. On the other
hand, some loads require lower price power rather than such high quality power. Unbundled
power quality service is paid much attention under the circumstances of diversification of needs
of customers for quality and price of electric power[1][2].
Moreover, distributed generators (DGs) such as photovoltaic generations (PV) and wind
turbines (WT) will be introduced to distribution system more and more, and reverse flow of
active power has possibility to cause new problems in the distribution system such as voltage
rise of distribution line and protection problem.
Flexible, Reliable and Intelligent Electrical eNergy Delivery System, which is called FRIENDS,
has been proposed as one of promising distribution system for such requirements, and intensive
studies are under way[3][4][5]. One of features of this system is introducing power converter
system called Quality Control Center (QCC) into the system for realization of unbundled power
quality service and easy installation of DGs.
In this paper, Details of AC-type Quality Control Center as power converter system are shown.
Main characteristics are that power fluctuations from unstable DGs such as wind turbine and
photovoltaic generation can be compensated in proposed QCCs and unbundled power quality
service is operated. Simulation and experimental results about these characteristics are shown
here. |
