Abstract: With the continuous advancement of new energy technologies, the demand for energy transmission in various stages—such as photovoltaics, energy storage, and DC microgrids—is steadily increasing. As a key component in multi-port power transfer, the Triple Active Bridge (TAB) converter offers advantages including bidirectional energy flow and electrical isolation among ports. However, under conditions of high load power, large inductor currents can lead to increased losses in both inductors and switching devices. This paper introduces an additional control variable α within the bridge, using the root mean square (RMS) value of the inductor current as the objective function. Under the constraint of a given power level, the circuit model is optimized through calculation, and combined with a closed-loop control strategy, the goal of minimizing the RMS value of the inductor current is achieved.