Communications - Scientific letters of the University of Zilina X:X | DOI: 10.26552/com.C.2026.055

Evaluation and Experimental Validation of Power Converter Topologies for a Bidirectional Grid-Connected Battery Energy Storage System

Michal Praženica ORCID...1, *, Patrik Resutík ORCID...1, Slavomír Kaščák ORCID...1, Michal Prídala2, Martin Kuchař ORCID...3
1 University of Zilina, Faculty of Electrical Engineering and Information Technology, Department of Mechatronics and Electronics, Zilina, Slovakia
2 A2B s. r. o., Zilina - Povazsky Chlmec, Slovakia
3 VSB - Technical University of Ostrava, Faculty of Electrical Engineering and Computer Science, Department of Applied Electronics, Ostrava, Czech Republic

In this research is described the topology assessment, design, simulation, and experimental verification of bidirectional grid connected BESS. Several converter topologies were assessed based on the efficiency, power quality, bidirectional capability, electromagnetic compatibility, and ease of implementation. A bridgeless totem-pole PFC converter, together with bidirectional CLLLC resonant DC/DC converter, was chosen and implemented in 2 kW lab prototype. Experimental tests in both grid-to-battery and battery-to-grid modes yielded maximum power of 2.28 kW, a power factor of 1.0, total current harmonics of 1.43%, and maximum efficiency of around 96%. These results show the suitability of the architecture chosen for bidirectional energy storage systems and grid connected energy management, renewable energy integration, and electric vehicle charging and V2G applications.

Keywords: active compensation system, battery storage system, bidirectional power flow, grid connected system
Grants and funding:

This research was funded by APVV-22-0330 “Research of a system for active and optimal management of electrical energy using battery storage system” and Vega 1/0314/24 “Research of a system for active management of electrical energy using battery storage system.”

Conflicts of interest:

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Received: June 12, 2026; Accepted: August 31, 2026; Prepublished online: September 24, 2026 

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