The simulation of machine-network interaction in multi-machine power systems

This paper presents a newly developed machine-network interaction transient simulation program. This program is especially useful in calculation of the transient shaft torque of turbine-generating units caused by various kinds of faults and switching operations. It can also be used for other purposes such as calculation of transient voltages and currents for harmonic analysis. In the program, most of the important power system elements such as generators, transmission lines, circuit breakers, transformers, shunt/series compensators, infinite buses, shafts of turbine generating units, excitation systems and power system stabilizers are modeled. Great efforts have been made to enhance the simulation speed. The implicit trapezoidal rule of integration is adopted to solve the differential equations and the critical damping method is used to eliminate the numerical oscillations caused by switching operations.<>