Prediction of dynamic response of marine systems incorporating induction-motor propulsion drives

A mathematical model is developed for a complete marine power installation, incorporating diesel-generator units, and induction-motor propeller and pump drives. The model is used in numerous studies associated with the prediction of the current and torque requirements of the two types of marine drive commonly encountered, including dual induction-motor-driven, variable-pitch propulsion units. Representative results are collected together to show the various conditions that give rise to operational transient behaviour. Various factors affecting the starting and operational characteristics of these drives are discussed and recommendations made for the overall electromechanical modelling necessary for the accurate simulation of the response to normal and abnormal disturbances possibly arising from in-service system operation.