Abstract: The cascade H-bridge (CHB) converter has become the preferred solution for large-scale photovoltaic (PV) grid-connected inverters due to its modular design. However, under different light intensities and temperatures, the power generated by PV modules in different areas varies, resulting in uneven and unstable output power between phases of the CHB converter. To this end, this paper proposes a hybrid power routing based on the CHB structure with a small amount of energy storage modules in the three-phase CHB PV inverter, which uses collaborative optical storage control to maintain stable power within the CHB, eliminating the unbalanced power generated by distributed PV between phases. And the converter output power can always meet the upper power dispatch on the grid side, improving the stability of the PV system. For the system safety region, the power transmitted by the full-bridge sub-module is limited under the carrier phase-shift modulation strategy, and the configuration of the PV and storage modules is analyzed in detail. Finally, the correctness and effectiveness of the proposed topology and control strategy are verified through simulations and experiments.