DC System and method ofoperating variable voltage for DC micro-grid

摘要

The present invention relates to a variable voltage DC micro-grid system and a method of operating the same, wherein a DC-DC converter for controlling charging and discharging of a battery in a DC micro grid system is removed and a battery is directly connected to a DC bus, ), The integrated control unit controls the voltage of the variable voltage DC bus line through the operation control of the converter connected to each structure according to the predetermined power flow analysis model, thereby occupying a smaller space and reducing system construction and operation cost At the same time, we propose a method for stable operation of micro grid system with constant voltage and constant frequency.