Modal reduced dynamic equivalent model for analog type power system simulator

Analog type power system simulators are playing important roles in cases where real time dynamic studies are required. Power system reductions are more important in analyses using an analog type simulator than a digital computer due to facilities limitations. This paper describes a modal reduced dynamic equivalent model which was developed for an analog type power system simulator to provide power system reductions. The model is implemented by using a modal analysis approach based on a digital type synchronous generator model. In simulator tests on a 28-machine power system, the model is judged to be useful for representing subsystems to be reduced in an analog type simulator.