This study focuses on the design and technical research of a shore power system for a Shanghai port terminal. Considering the terminal's superior wind power generation conditions, integrating wind energy generation technology into port shore power equipment can significantly enhance power supply reliability and reduce electricity costs. However, several technical challenges remain in the practical design of shore power systems. The variable climatic conditions at the terminal prevent wind power systems from maintaining maximum power output. To address this, a gradient variable-step perturbation and observation method is designed and optimized for onshore wind power systems. Simulation tests demonstrate that this strategy enables the system to better adapt to sudden wind speed changes at the terminal, providing reference insights for future shore power system designs of similar types.