The value set approach is a graphics-oriented method based on the characteristic polynomial of the system. It can be used to analyze the impacts of uncertain parameters on the system stability. This paper describes the implementation of the value set approach in the robust stability analysis of the large power system

including the treatment of large numbers

memory optimization

assessment and adjustment of system reduction

and application to Gamma-stability criterion. These techniques are vital for the actual application of the value set approach. Also the value set approach is compared with the widely used μ-based approach in terms of their robustness stability analysis

stability margin calculation

parameter impact analysis

conservativeness

and computation speed. Finally

the North China system is used to illustrate the implementation of the value set approach and test the two approaches

which reflects characteristics of the two approaches.