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Voltage stability has become common potential threat of receiving-end load center power grid such as Beijing, Shanghai, Guangzhou, etc. Take the typical receiving-end grid, Guangzhou power grid, as an example, through simulation analysis, it reveals two different degree transient voltage instability mode of receiving-end grid: the system transient voltage instability and local transient voltage instability, further study its instability characteristics, mechanism and influencing factors. In the view of the load model, it directly affects the accuracy of the voltage stability analysis. The typical calculation model, 50% constant impedance plus 50% motor, is difficult to reflect the load characteristics under different conditions and different time, therefore, it's lack of credibility. This paper puts forward using the marketing and distribution information integration technology to realize real-time classification load statistic, and then establish a more accurate real-time classification load model. Simulation shows that the modeling of real-time classification load model, which combining the advantages of the comprehensive statistics and parameter identification method, is very quick and convenient, the simulation using real-time classification load model is more dependable and can reflect characteristics under different conditions. This research has important reference meaning to load modelling and voltage stability analysis of receiving-end grid.Index Terms -Voltage stability, instability mode, real-time classification load model, marketing and distribution information integration.

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