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Novel isolated cascaded half-bridge converter for battery energy storage systems
By: Jauch, Felix; Biela, Jurgen;
2014 / IEEE
This item from - IEEE Conference - 2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe) - This paper presents a novel isolated cascaded half-bridge converter for medium voltage battery energy storage systems with three phase legs of series connected modules in star connection. Each module consists of a grid-side half-bridge, a battery-side full-bridge and a medium-frequency transformer providing isolation. The presented modulation ensures grid-side zero-current-switching (ZCS) and battery-side zero-voltage-switching (ZVS). The control system consists of a grid current control as well as a state-of-charge (SOC) balancing control for the batteries. Evaluation of the proposed module of a 6.6 kV, 150 kW, 1MWh design example shows an average module efficiency of 97.4% including semi-conductor and transformer losses. Simulation results verify the converter concept including the applied control structures.
Components, Circuits, Devices And Systems
Power, Energy And Industry Applications
Robotics And Control Systems
Phase Locked Loops