基于DDVC的超深鉆井絞車型升沉補償系統(tǒng)的建模和控制
[Abstract]:For the detection and development of deep-sea resources, it is necessary to adopt ultra-deep water ultra-deep well floating drilling. Heave compensation system is one of the necessary equipment for floating drilling. The heave compensation system of winch is based on direct drive volume control (DDVC) and hydraulic transformer energy recovery technology. The lifting displacement of drill string is compensated by controlling the movement of winch. The direct drive volume control part of the system has the advantages of energy saving and high efficiency, wide range of speed regulation, flexible control and so on. However, the DDVC system belongs to volume control, the response speed of the system is slow, and the control characteristic is poor. Therefore, the improvement of dynamic characteristics of DDVC hydraulic system is one of the key points of this paper. In the heave compensation system of winch type, the heave motion of the platform is an interference, the purpose of compensation is to ensure the constant drilling pressure, the conventional feedback control belongs to the method of control after the error appears, the precision is not high, and the response speed is slow. The compensation operation of the control mechanism can not be synchronized with the lift motion of the floating operation platform, and the synchronization elimination of disturbance, namely synchronous lift compensation, can not be realized. The compensation precision is not high. Therefore, the problem of eliminating disturbance synchronously and improving the compensation accuracy of large inertia system is another key problem in this paper. The main research work of this paper is as follows: 1. The mathematical model of the direct drive volume control hydraulic motor system in the heave compensation system of the winch model is established, and the simulation model of the direct drive pump control motor system is established in AMESim. The mathematical model of the system is simulated and analyzed, and the AMESim model of the system is simulated and verified, and the speed response characteristics of the direct drive pump control motor are explored. 2, in order to improve the dynamic characteristics of the heave compensation system of the winch type, The scheme of variable speed-variable displacement pump-controlled motor system and the scheme of direct-drive pump-controlled motor system controlled by multiple groups of different power motors driving different displacement pumps are presented. The simulation analysis and verification are carried out in MATLAB/Simulink and AMESim. The correctness of the proposed scheme is verified. 3, the overall control scheme of the heave compensation system of winch type is improved, and a nonlinear disturbance compensation controller based on platform velocity prediction is proposed to compensate the displacement of the hook. The disturbance synchronous elimination of the large inertia system is basically realized, and the compensation accuracy of the system is improved. 4. The experimental platform of the heave compensation system of the straight drive twist model is designed, and the structure design and AMESim modeling and simulation of the experimental platform are carried out. The compensation characteristics and response characteristics of the experimental platform are analyzed. The speed response experiment of servo motor is carried out to verify that the model of servo motor is correct. Combined with the ocean heave motion simulation platform, the experimental analysis of the predictive compensation controller is carried out to verify that the proposed prediction scheme is reasonable.
【學位授予單位】:廣東工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:P715.1
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