Research on HIL Simulation of Underwater Thermal Power System

A real-time simulation computer, a back-pressure simulation device, a load pressure simulation device, a speed adjusting and driving device form the core of a hardware-in-the-loop(HIL) simulation system for an underwater thermal power system. A proportional and a proportional-integral control algorithms are used in the back-pressure and load pressure closed loop control system. We adopt low-pass digital filters to improve the stability of the numerical simulation model, and modify the dynamic behavior of the model to make the HIL simulation system coincide with the actual torpedo thermal power system. Simulation results show that the dynamic simulation precision of the back-pressure, the load pressure and the rotary speed of engine reaches 0.5%, 1.5% and 1.5%, respectively. The system obtains high simulation accuracy.