Abstract
The vector control of LNG marine propulsion motor based on improved EKF is proposed for the problem of frequency operation of the controller which caused by the unknown external load disturbance that acting in the LNG marine propulsion motor system. The periodic torque ripples are reduced by introducing the speed error compensation based on improved EKF into the update algorithm of the vector control by utilizing the previous error data and error changing trend, and the results were compared with the traditional EKF vector control. It shows that the torque ripples of propulsion motor were minimized, the state observer accuracy and robustness performance of the LNG control system was improved.
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