A part of the technological renovation achievements of the simulation system in Sichuan substations are introduced: 1.The calculation of load flow of power system is analyzed with graphical modeling

and the programs for load flow calculation and malfunction calculation of power system are created automatically based on the raw data of simulation object such as primary wiring diagram

parameters of every circuit and equipment.2.PQ resolutions and the method of storing admittance matrix with non-zero element are adopted to accelerate the computation speed and satisfy the time requirements of the simulation system with many connection networks.3.On the fault power flow calculation

dummy four-port method is used to obtain the accurate calculation to guarantee real-time result.4.On the coach platform

the method of fault graphic insertion is adopted to improve the function of coach platform and as well as the efficiency of the coach.