Abstract: Traditional power frequency distribution architectures for industrial park PV-storage-charging integrated stations suffer from complex power conversion links, excessive equipment redundancy, high operational losses, and poor adaptability to new high-voltage DC sources and loads. This paper proposes a time-sequential engineering selection and design method for solid-state transformers (SST). A four-stage time-sequential quantitative design system is established, including operating condition modeling, topology optimization, multi-parameter co-optimization, and full-dimensional verification, enabling precise matching of SST parameters with complex fluctuating conditions. Based on an actual industrial park demonstration station, engineering parameter determination, multi-condition measurements, and comparative verification with traditional architecture are conducted. Results show that the proposed SST scheme effectively reduces multi-stage redundant conversion links, significantly improves equipment integration and site utilization, and enhances system energy efficiency, dynamic response, and adaptability to complex conditions.