Main work of this thesis is as following:1) Definition of practical delay margin (PDM) is provided: Just as we know, if a control device or a power system with time delays works stable, there must be not eigenvalue with positive real part in its Jacobian matrix.

An effective approach is given to calculate the system delay margin.

The delay margin is defined as the maximum time delay that a power system can sustain without losing its small signal stability.

Quadratic stability and stability margin analysisof discrete interval systems;

The characteristics of mine power system,voltage stability and system stability margin were analyzed and the measures of preventing vlotage stability from destruction were set forth.

And the testing criteria are discussed,for example,stable margins, performance index,and controller fragility.

Based on the time domain simulation, the calculation method for single machine acceleration area and deceleration area, stable margin and unstable margin, critical machine equal area criterion (SMEAC) are proposed.

The stable margin is defined.

The simulation result of circular turning gaits in computer gives the relation of the instantaneous longitudinal stability marginsto time.

So, the thought for the simulation design was put forward based on energy margin and temperature margin, the arithmetic of simulation design of CICC configuration was deduced, and the model of the simulation was built.