An Examination on the Independent Micro-Grid Operation Algorithm for DC based Industrial Complex

Abstract

Background/Objectives: In recent years, as the distributed power supply increases, stand-alone microgrids, which are easily connected to renewable energy, have attracted attention. The stand-alone micro grid is a grid that is formed separately by connecting distributed power sources independent of the existing grid. Unlike the distributed resources associated with the existing grid, the power grid is formed through the DC network, which is different from the existing AC grid in terms of basic grid configuration and operation algorithms. Methods/Statistical analysis: The proposed stand - alone micro - grid operation algorithm is applicable to each site of micro grid constructed in industrial complex. It is an operation algorithm for self - consumption without consideration of power transactions between microgrid configuration sites. Through this, operation characteristics without considering linkage with DC grid were analyzed. In addition, the efficiency is verified by comparing with the existing algorithm. Findings: In this paper, we apply the algorithms for self - consumption and peak reduction in each factory that construct micro grid and compared them with the existing algorithms. In order to cope with the existing algorithms, the range of SOC was used 20% and the charge / discharge operation was improved to control the SOC charging / discharging waveform to be gentle. In addition, it has been proved that ESS can be used stably under similar conditions while supplying the same power as the existing one by raising the energy efficiency. Improvements/Applications: In this paper, the self-consumption algorithm of the existing DC microgrid construction site is presented, and the energy saving amount is increased by about 15% by presenting the optimized algorithm than the existing algorithm, and the charge / discharge stability of the ESS is increased and the rapid charge / discharge Prevented.