A Series Partial Power Converter Based on Dual Active Bridge Converter for Residential Battery Energy Storage System

Conventional Full Power DC-DC Converters (FPC) which process whole power between their input/output, are close to their limits in terms of efficiency and power density. One of the most promising solutions to overcome these limits is Partial Power Converters (PPCs). In this paper, a Series PPC (S-PPC), which connects a Residential Battery Energy Storage System (RBESS) to a DC-bus is introduced. In the proposed converter, in its critical point, just 27% of the overall power is processed. Application of a Dual Active Bridge (DAB) converter with bidirectional/bipolar Current Source (CS) port enables the buck-boost operation of the S-PPC in both charge and discharge operation mode. So, the processed power is further decreased. Simulations are done in PSIM to validate the mathematical analysis.