| The rapid consumption of energy in the world and the continuous increase of industrial oil consumption inevitably accelerate the pace of oil extraction.After the tertiary oil recovery in the oil field,most of the oil wells are low liquid wells and heavy oil wells,and the requirements for the pumping screw pump are further deepened.Therefore,the pumping screw pump needs to have long stroke and low stroke performance.In the early application of the screw pump,because the negative impact of the high-speed operation of the screw pump cannot be effectively reduced,the industry generally runs at a low speed,which leads to low efficiency of the screw pump oil production system.If the direct-drive permanent magnet synchronous motor is used to properly increase the rotational speed of the screw pump,the problem of reducing the overall transmission efficiency of the mining equipment and the working efficiency of the motor due to the reducer in the traditional pumping unit can be fundamentally solved.Permanent magnet synchronous motor(PMSM)is superior to traditional electric excitation synchronous motor in many aspects such as flexible shape and size,structure,operational reliability,volume,weight,loss and efficiency,making it suitable for civil,aerospace,military,etc.It is widely used in many fields.On the basis of the more stable speed control of the permanent magnet synchronous motor,driving the screw pump as the control object is the research topic of this paper.When the permanent magnet synchronous motor is used as the control object,due to its own complexity,the traditional control algorithm cannot achieve perfect control effect,and the use of more excellent control algorithm is the focus of current research.Although fuzzy control shows good dynamic quality when used in PMSM nonlinear speed control system,the chattering problem of sliding mode control cannot be eliminated.On the basis of not affecting the performance of sliding mode control,refer to other control algorithms and fuzzy control The correlation and superiority of the sliding mode control are further adjusted by using the fuzzy control,and the flexibility and rapidity of the fuzzy controller can be combined to avoid the difficult calculation problem of the parameter calculation and setting of the sliding mode control.and furtheIn this paper,in order to stabilize the speed of the screw pump,aiming at the nonlinear and hysteretic control problems of the sliding mode control of the permanent magnet synchronous motor,based on the analysis that the parameters of the sliding mode control have weak connections in different stages,a fuzzy parameter tuning strategy is proposed;On the basis of overshooting and chattering and having a certain anti-interference ability,the complexity of control is simplified.The main function of each parameter in the sliding mode motor control process and the relationship between the parameters and the parameters are studied,the fuzzy logic control is combined with the exponential approach rate,the change of the sliding mode parameters is adjusted by the fuzzy control,and the fuzzy The approach rate eliminates the constant velocity term.This design method simplifies the complexity of sliding mode parameter adjustment,and considers the adjustment capability of the system,making the design and adjustment more realistic and convenient.The improved control strategy is compared with the traditional permanent magnet synchronous motor sliding mode control and PID control through software simulation,and a hardware-in-theloop platform is built to verify the control performance of the improved control strategy.Finally,the control strategy designed in this paper is applied to the actual oil-pumping screw pump control,and the control effect is good.r reduce chattering. |
PDF Full Text Request