Abstract: This study proposes a sparrow search algorithm-based power coordination control method for three-port converters in microgrids. Firstly, a novel isolated three-port converter is topologically analyzed, and an equivalent circuit model is established, followed by the derivation of the basic working principles and power transmission formulas of three-port converters. Secondly, a small-signal model of the three-port converter is developed, and a power coordination control strategy based on the sparrow search algorithm is designed. Subsequently, the superiority of the sparrow algorithm over traditional PI control is preliminarily verified through simulation circuits. Finally, the feasibility of the proposed strategy is validated through the RT-LAB experimental platform. The experimental results show that the three-port converter can operate stably, switch operating conditions according to external conditions, and achieve power coordination control.