Abstract
The speed sensorless vector control for podded propulsion motor of dynamic positioning system is proposed for the problem of installation, connection and reliability of the traditional mechanical sensor because of the influence of wholly enclosed, sea water cooling and harsh environments. The improved algorithm is designed based on virtual reference feedback tuning (VRFT), the design of controller is model-free and it just depends on the I/O data of the dynamic positioning system. Then the proposed algorithm is applied to control the speed and torque of dynamic positioning system podded propulsion motor, the adjustable parameters are few, and the computation required is little. This makes it adaptable to various sea situations. Simulation results show that both the speed and torque can obtain satisfied dynamic performance. The requirement of steady-state error for the dynamic positioning system was satisfied and the system cost was reduced.
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