Abstract
Korean government (Ministry of Knowledge Economy) has estimated that the rate of wind power (WP) in the new energy sources will be occupied by 37% in 2020 and 42% in 2030, and also green energies such as photovoltaic (PV) and WP are expected to be interconnected with the distribution system according to the new national regulation of Renewable Portfolio Standard (RPS) starting from 2012. However, when a large scale wind power plant is connected to the traditional distribution system, the protective devices (mainly OCR and OCGR of re-closer) can cause the mal-function problems due to change of fault currents. Under these field conditions, this paper deals with analysis of faults current by using both the symmetrical components of fault analysis and PSCAD/EMTDC modeling and proposes the mechanism of fault current considering the WP.
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