Unbalanced analysis of multimachine power system using phase frame of reference

The degree of sophistication of power qsteni simulation and analysis has undergone considerable change over the past decade. With the advent of powerful and high-speed computer facilities, power system analysis have been able to stimulate system components as accurately as the available information will allow. The development of a circuit theory approach relating to power system network to the solution of transient problems has evoked considerable interest in different techniques for the solution of the associated differential equations.