Quality Evaluation of Jointly Used Modular Multilevel Converters and Battery Energy Storages

Abstract

Battery energy storages nowadays are utilized in various applications. The similarity of these applications and multilevel nature of the batteries logically encourages building of the interface converters based on a multilevel scheme. This paper is devoted to the choice of the configuration of this scheme and its operation mode. Tentative quality evaluation is made based on the root-mean declination of output voltage from its reference (THD). MATLAB-Simulink simulation is chosen as a reasonable data collection method. The results of the simulation show that a trade-off configuration may include 3-4 levels with minor inter-level pulse width modulation. In the same time further investigation must be done in order to study the influence of other technical (losses) and economical parameters.