Balanced Power Distribution Control Strategy of A DC-DC Converter and Energy Storage System by Using Soc Management
Omkari Angadi, Ranjith Kumar Gatla, P Shiva Kumar, Devineni Gireesh Kumar · 2024
The study's goal is to create a DC-DC modular multilevel converter-based supercapacitor energy storage system (MMC-SESS) that can help with peak load shifting in DC power grid energy storage applications on ships. It is the goal of this study to look into the control problems that come with the converter and to improve the current loop of the MMC-SESS by adding control for the supercapacitors' state of charge (SOC). The fuzzy immunity algorithm is being used in place of the traditional PI controller in order to improve the dynamic performance of the loop that is currently being used. As a means of establishing equilibrium, the SOC balancing loop makes use of the maximum SC voltage as its potential objective. As a consequence of this, modules that have a low SOC are able to control the average current of the sub-modules by using a reference value and their own SOC as the basis for the regulation. Therefore, the current flowing through the system will deviate from the recommended value as a result of the negative duty cycle that the SOC balancing loop of each sub module produces. A current compensation loop should be established as soon as possible in order to reduce the amount of variation in the system's current. For the purpose of determining whether or not the suggested method is effective, a simulation model is ultimately developed with the help of MATLAB and Simulink. Taking into consideration the findings, it seems that the existing degree of control accuracy and reaction speed has been enhanced. The possibility exists that the suggested approach might successfully offer SOC balancing control throughout the whole of the charging and discharging operations, hence providing an additional benefit.