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Research And Simulation On Dynamic Positioning System Of Propulsion Motor

Posted on:2018-11-23Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y ZhaoFull Text:PDF
GTID:2322330518954642Subject:Engineering
Abstract/Summary:PDF Full Text Request
With the development of power electronics technology and microprocessor control technology,the AC speed control technology for marine high power AC propulsion motor has become possible.It is widely used in the propulsion devices such as the main propellers of the ship,the side thruster devices and the full-revolving propellers etc.,with its short tuning time,good speed performance,low power consumption and high propulsion efficiency.When the electric propulsion is used as the main propeller of the ship,the field oriented control method can meet the requirements of the ship propulsion.However,when the power propeller work as DP ships' position correction propeller,facing the wind,waves,flow and other external interference make the speed of the frequency changing too fast.The field oriented control method exisit problems of low accuracy,long stable speed control time,large speed overshoot and so on.Electric power propeller has been unable to meet the dynamic positioning conditions under the real-time speed requirements,resulting from surge,sway,bow three degrees of freedom within the greater deviation.In order to solve this problem,a fuzzy field oriented control technique is adopted to control the propulsion motor.In this paper,under the condition of Matlab/Simulink,a fuzzy controller is established to adjust the PID parameters of the velocity loop in the traditional field oriented control so that it can automatically set the appropriate PID regulator parameters under frequent speed changes,and the propulsion motor can be used in the dynamic positioning to achieve an optimal speed tracking effect.It can also reduce the motor speed control time and overshoot shock for side thruster and azimuth thruster improving the robustness of the propulsion system,solving the problems of the poor positioning accuracy and large position deviation caused by traditional field oriented control technology.Overcome the large deviation of surge,sway,bow wave three degrees of freedom.In this paper,the feasibility of the fuzzy field oriented control for thruster motor is verified by the fixed speed test and the variable speed test in DP condition.In research of fixed speed simulation,the comparison of the two control methods are carried out in permanent magnet synchronous motor(PMSM)with propeller load starting,the surging caused by the going into the water and the sudden charge/discharge loading caused by going out of water;In the study of the variable speed simulation in the DP condition,comnined all the system of dynamic positioning,control simulation of the propulsion motor is carried out.The two control methods are also analyzed and compared.Finally,the simulation results show that the fuzzy field oriented control is superior to the traditional field oriented control in regulating time,anti-jamming ability and the speed overshoot,thus it can improve the accuracy and stability of the dynamic positioning system.And also improve the ship stability.
Keywords/Search Tags:Field Oriented Control, Fuzzy-PID, Permanent Magnet Synchronous Propulsion Motor, Dynamic Positioning, Electric Propulsion
PDF Full Text Request
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