RECOVERY BRAKING IN ELECTRIFIED BOATS USING DUALACTIVE BRIDGE DC-DC CONVERTER WITH ULTRACAPACITOR
Abstract
Regenerative electric propulsion involves AC motors recharging batteries during sailing. This paper presents the application of a dual active bridge (DAB) DC-DC converter- based interface system for recovery braking in electrified boats (EBs), incorporating ultracapacitors. The study focuses on examining the charging and discharging scenarios of ultracapacitors in the system. The proposed method utilizes a simple proportional-integral (PI) controller to regulate the terminal inverter voltage direction by adjusting the phase shift angle of the DAB converter. The MATLAB/SIMULINK software package is employed to model and simulate the proposed interface system. The study explores energy recovery during braking operations in EB and proposes an effective control strategy for energy distribution from batteries and ultracapacitors for EB applications. This approach reduces electrical energy production. The DAB converter offers several advantages, including bidirectional power flow capability and high efficiency. By integrating ultracapacitors into the system, the recovery braking energy can be efficiently captured and stored for later use, enhancing the overall energy efficiency of EBs. The charging case involves transferring the excess energy from the braking process to the ultracapacitors, replenishing their energy storage. On the other hand, during the discharging case, the stored energy in the ultracapacitors is utilized to power the boat's electrical systems, reducing the reliance on the main power source. Permanent magnet synchronous motor (PMSM) is coupled to a DC/AC converter system that serves as a thruster system to simulate the energy requirements of an EB during propulsion operations. The main objectives of the proposed control approach are fast current tracking for the battery system, ultracapacitor-based DC bus voltage stability, and energy load distribution for an EB under a range of demand scenarios. The ultracapacitor which act as a secondary energy source for the EB shall be connected to a DC bus using a bidirectional DC-DC converter. Multiple cells are arranged in series and potentially also in parallel to make up an ultracapacitor pack.
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DOI: https://dx.doi.org/10.21622/MARLOG.2024.13.1.89
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The International Maritime Transport and Logistics Journal (MARLOG)
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