Speed sensorless vector control of marine podded propulsion motor based on strong track filter

It is a challenge to control the propulsion motor of ship podded SSP system under rough sea conditions or navigating in the sea because it is difficult to obtain the parameters of system accurately due to the changing of load and sea conditions. In this paper a speed sensorless vector control method is presented aiming to the characteristics of wholly enclosed and seawater cooling of marine podded propulsion motor and is applied to the marine podded SSP propulsion motor control system. The design and analysis of the controller relies on the orthogonal principle, it makes the residuals have approximately orthogonal or orthogonal by adding a fading factor. The system state strong tracking ability is ensured, and the observer error of EKF algorithm is compensated. Simulation results based on different sea conditions illustrate the validity of the presented algorithm, and it is robustness to system disturbances.