Abstract: New energy substations have characteristics such as dispersed equipment, heterogeneous communication protocols, real-time control, and coexistence of massive data. Single network or hot standby redundancy schemes are difficult to balance zero packet loss switching, bandwidth utilization, and engineering compatibility. Therefore, the study focuses on the network design of the secondary system of new energy substations under the PRP/dual star architecture. Build an edge adaptation layer and design an intelligent access gateway with protocol awareness and redundant state tagging capabilities. Design a PRP/dual star backbone network with a dual star physical topology as the carrier, deploy PRP redundancy mechanism to achieve dual network zero switching time parallel transmission, and divide control class, real-time sampling class, and operation and maintenance management class messages into different virtual channels. Build a unified monitoring data bus, based on the publish/subscribe model, perform sequence number verification and de duplication fusion on the data received from the dual network, output a single trusted data source to the monitoring host at the station control layer, and design a redundant verification mechanism for bidirectional control commands. The test results show that under 90% network load rate, GOOSE latency remains stable within 2.1ms, and the success rate of control command execution remains 100% during single network interruption, verifying the high availability and control certainty of the proposed design in harsh electromagnetic environments and network disturbances.