Position Sensorless Control of the PMSM in a Wide Speed Range

Due to its high torque density, excellent efficiency and ease of control, the Permanent Magnet Synchronous Machine has found its use more and more in today’s world. To power these machines however, the position of the rotor magnets is required to be able to inject currents which generate the desired torque and speed. This magnet position is...

Development and Analysis of Advance Velocity Observers for Marine Propulsion Systems

Marine propulsion systems with diesel engines face continuous variations in propeller shaft speed and torque during operation, due to waves and changing rudder and water inflow angles. Traditional propulsion control systems do not take these variations into account, and attempt to maintain a constant shaft speed. These changing torques, in...

Observer-based robust control for dynamic positioning of large-scale heavy lift vessels

With the growing demand of large-scale heavy lift vessels in the deep-sea offshore construction works, high performance of Dynamic positioning (DP) systems is becoming ever crucial. However, current DP systems on board of heavy lift vessels do not consider model uncertainty (typically arising from mooring forces). In this paper, an observer...

Sensor Fusion and Observer Design for Dynamic Positioning

The fusion of measurements from distributed sensors for dynamic positioning (DP) system based on state estimation algorithms is studied in this thesis in order to increase the accuracy and redundancy of the reference system in DP and a state observer is also designed to estimate of the low frequency vessel motion for the input of DP controller....