Improvement of a power quality of microgrid system interconnected to distribution system in emergency condition

In today's world, according as interest about renewable energy source rises, many researches are progressing about energy source development and power distribution system configuration for improving renewable energy source's efficiency. The microgrid is small power system that consists of several consumer's loads and small size distributed resources and accomplishes one independent system. It is operated by interconnecting with power distribution system and could be islanding operation according to situation. Therefore, the control of microgrid makes microgrid can be connected to the power distribution system without equipment correction of power distribution system, and can compensate voltage quality and must satisfy dynamic request of loads as active and reactive power are controlled independently. Specially, when consumer's load includes sensitive loads, consumer is going to expect very high reliability from microgrid. In this paper, we studied about effects that get to power distribution system relationship emergency condition this microgird using EMTP/RV modeling and simulation. And we proposed microsource's control algorithm and simulated to improve power quality that is supplied in microgird interior load in emergency situation of power distribution system. This shows that microgird can provide local high quality power supply or voltage compensation ability.