A Lithium-ion battery energy storage system using a bidirectional isolated DC-DC converter with current mode control for More Electric Aircraft

The present trends in the aircraft industry is a shift towards a “More Electric” architecture, in which electrical power drives aircraft flight surfaces. With the increase in electrical power requirement, a high energy density battery energy storage system (BESS) is required in a More Electric Aircraft (MEA). This paper describes the design and operation of a 50 kW, 6.4 kWh Lithium ion BESS in detail, wherein the circuit parameters are designed considering the required power sharing and the limitation of ripple in voltage and current. A current mode control technique is proposed for the integration of the proposed high energy density Li-Ion BESS with 270 V DC power distribution bus. A bidirectional isolated DC-DC converter is used for the integration. In order to achieve the high performance of the isolated bi-directional DC-DC converter, the system output voltage must maintain good tracking of its reference command, despite transient events and varying operating conditions. The proposed battery configuration is verified under different dynamic conditions using the proposed current mode control with variations in the output current (load). The circuit modeling is done in PSIM simulation environment, and simulation results are presented and discussed in the paper.