Method and system for state of charge management

The present invention relates to a method and a system for SOC management. A method for managing the state of charge (SOC) of a battery by a power condition system (PCS) includes a step for detecting the present SOC of the battery, a step for controlling a smoothing rate according to a result obtained by comparing a preset target SOC with the detected present SOC, and a step for controlling the charge and discharge of the battery based on the controlled smoothing rate. [Reference numerals] (AA) Start;(BB,DD) Yes;(CC,EE) No;(FF) End;(S402) Detect a present SOC of a battery;(S404) Present SOC = target SOC;(S406) Set a smoothing rate as predetermined standard value;(S408) Calculate an inverter output command value;(S410) Present SOC > target SOC;(S412) Calculate the smoothing rate by using equation 1;(S414) Calculate the smoothing rate by using equation 2