Modeling and control system design of a marine electric power generating system

Steam turbine generators are generally adopted as the main generators in steam ships. A nonlinear mathematical model for marine electrical power generating system consisting of two steam turbine driving generators is developed in this paper. Primary frequency control and load frequency control systems are both designed to regulate the system frequency and electrical power. Adaptive proportional (P) controller is developed to enhance the primary frequency control performance. Proportional integral (PI) controller is employed for load frequency control. Step experiment of main steam pressure is simulated to study the system transient behavior. Load dump tests are conducted to investigate the control performance. For load frequency control, the influences of power and frequency weight and delay time between primary frequency control and load frequency control are studied, and recommendations are provided for parameter selection.