The invention belongs to the technical field of RTDS (Real Time Digital System)-based 500-Kv major network modeling simulation systems for a power network and particularly relates to a model system which can be effectively applied to real-time simulation analysis of an electric power system. The system is characterized in that an RTDS (Real Time Digital System) is connected with the Ethernet through a data interface, and one end of the Ethernet is connected with a host computer; and the system comprises a real-time digital modeling simulation system model, an AC major network module, a DC major network module, a secondary synchronous resonance module, a wind power module and a visual graph module and is used for simulation, calculation and analysis of a regional power network. According to the RTDS-based 500-Kv major network modeling simulation systems for the power network, simulation, calculation and analysis of an AC and DC series-parallel power network can be performed; secondary synchronous resonance researches of the power network can be developed; and transient stability simulation, calculation and analysis can be performed to the power network including a wind turbine generator system, researches on operation characteristics of other power networks can be performed, and the calculation and analysis level to power networks can be improved.