Multi-resonant three-port converter with power decoupling function and its conduction loss optimized modulation strategy

A 3LCLCL three-port converter (3LCLCL-TPC) that can achieve topological-level power decoupling is proposed, and the working principle of 3LCLCL-TPC under the triple-phase-shift modulation strategy (TPSMS) is analyzed. As the main loss of the converter, conduction loss can be reduced by reducing the effective value of the current. Therefore, a modulation strategy optimization method based on the improved electric eel foraging optimization is proposed to optimize the conduction loss. In order to enhance the search capability of electric eel foraging optimization, the algorithm was improved by combining piecewise map and crisscross optimization. Then, the improved electric eel foraging optimization is used to optimize the parameters of TPSMS at a given power to achieve reduction in conduction loss. Through the comparison of the convergence curves of particle swarm optimization, electric eel foraging optimization and improved electric eel foraging optimization, it is proved that the improved electric eel foraging optimization has strong search ability. Finally, it was verified through experiments that the parameters obtained by improved electric eel foraging optimization effectively reduce the conduction loss.