| Power load flow calculation is a basic tool for system programming and operational analyzing in power system. For the complexity of the structure of power network, all analysis of power system and students training should depend on power system simulation analysis software.Power load flow analysis is the most fundamental and important content of power system analysis software, which can determine the operation status of each part in the whole power system according to the given operation conditions and system connecting status.Power load flow calculation is basic with bus admittance matrix. Power network topology is the base of bus admittance matrix. And bus admittance matrix is to make rubbing with the change of network topological structure. If we can not modify network topological structure in time accurately along with the switch located state change of real time to make rubbing, will cause result mistake. The thesis links up virtual load flow calculation and network topological analysis in power system as a whole to take virtual load flow calculation of real time with the change of the switch.Based on object-oriented programming technology foundation, the unification of the analysis and calculation is realized through the graph contact surface. In the foundation of waterpower simulation software V3.0, we analyzed power network topological model. Based on a virtual power network, bus matrix was given dynamically. The thesis proposes a virtual load flow method. In the programming of power system, the simulation software can modulate any of complex power system and effectively simulate the power system. The interface of load flow was realized through topological analysis. We founded a load flow computation concrete electrical network mathematical model. Finally an example is given. The procedure was analyzed by use of P-Q method. The thesis validates the rationality of the virtual power load flow.
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