<p>This paper proposes a single-stage three-port isolated H-bridge inverter. Five operating modes and five switching equivalent circuits of the inverter are studied, and three H-bridge three-phase-shift modulation strategy and multi-loop energy management control strategy are proposed to achieve the maximum power tracking of the photovoltaic cells, at the same time, the energy flow and power balance between the three ports of photovoltaic, battery and load are realized by reasonably controlling the charging and discharging of the battery, so as to ensure the continuous and stable power supply of the system to the load. The circuit topology, operation modes, switching equivalent circuits, phase-shift modulation strategy and control strategy, and circuit parameter design of the inverter are also theoretically analyzed. On this basis, a single-stage three-port isolated H-bridge inverter experimental prototype is designed and developed, and the experimental results verify the feasibility and correctness of the proposed topology and control strategy.</p>