Battery Management System (BMS) Considering State of Charge (SOC) With Integration of Open Circuit Voltage and Coulomb Counting Methods Ups Sinyal Telecommunication Equipment Room (STER)

Voltage, current and temperature parameters on the UPS have not been monitored in real-time. So, SOC of the battery cannot be known directly. By knowing this data, energy management from the battery can be carried out. Then, the battery can function optimally with the maximum battery operating time range specifications. Through continuous real-time monitoring, the quality of the battery is always maintained. Batteries are the main energy source in relays in signal and telecommunication systems. So, a study needs to be carried out to maximize the service life of the battery. This research uses algorithm integration of Coulomb counting (CC) with estimates of Open Circuit Voltage (OCV) to calculate SOC for battery energy management system. From the experiments carried out, namely battery charging and discharging, as well as algorithm integration CC and OCV You will know the voltage, current, and charging and discharging times of the battery. From these experiments, the proposed algorithm can improve the accuracy of SOC estimation. BMS is done with cut off battery discharge according to the minimum battery voltage limit. Based on method Coulomb Counting, the change in the value of the current coming out of the battery during the discharge process is the most important parameter in estimating SOC. The current that comes out when the battery is 100% to 40% looks quite stable with a slight decrease. However, after the SOC reaches 40%, the current drops significantly. In condition charging, the size of the battery SOC is measured linearly with changes in time. The battery SOC experiences changes in value when charging from 0 to 100% linearly with time charging. When the charging conditions are high, the measured charging current value is consistently proportional to the rate of SOC addition. The SOC capacity of the battery is also directly proportional to the rated voltage value of the battery. When the SOC is 100% the battery reaches the maximum voltage 27.01 Volt immediately after charging and reaches a nominal voltage of 24.0 Volt, the rated voltage 2 (two) hours after charging.