连续波钻井液脉冲器电流解耦控制器的研究

Research on Current Decoupling Controller of Continuous Wave Mud Pulser

连续波钻井液脉冲器作为钻井液脉冲随钻测井技术中的最新技术,数据传输效率远高于目前广泛应用的正脉冲型钻井液脉冲远传系统,永磁同步电机(PMSM)作为连续波钻井液脉冲器转阀的驱动电机,其动态性能直接影响着井下信息的传输质量。针对井下温度变化造成的电机参数不匹配,导致电机控制性能降低的问题,提出了一种基于扩张状态观测器(ESO)的复合解耦控制方法。该方法将定子电阻压降、交叉耦合项、内部不确定干扰以及外部干扰等均视为扰动。利用扩张状态观测器对扰动进行实时观测,并将其补偿到电流控制器的输出端,从而实现系统的解耦控制,达到精准控制电流环的目的。仿真分析中,当电阻参数不匹配时,将复合解耦应用在电机的电流环控制中,可以有效提高永磁同步电机的动态性能,从而提高连续波钻井液脉冲器的信息传输质量。

As the latest member in mud pulse logging while drilling technology,the continuous wave mud pulser has much higher data transmission efficiency than the positive pulse mud pulse remote transmission system widely used at present.The dynamic performance of permanent magnet synchronous machine(PMSM),the drive motor of the rotary valve of the continuous wave mud pulser,directly affects the transmission quality of downhole information.In order to solve the problem of motor control performance degradation caused by unmatched motor parameters resulted from downhole temperature variation,a composite decoupling control method based on extended state observer(ESO)was proposed.In this method,the stator resistance voltage drop,cross coupling term,internal uncertain disturbance and external disturbance are all regarded as disturbances.The ESO was used to observe the disturbance in real time and compensate it to the output end of the current controller,so as to realize the decoupling control of the system and achieve the purpose of precise control of the current loop.Finally,simulation analysis was conducted,showing that when the resistance parameters are not matched and the composite decoupling is applied in the current loop control of the motor,the dynamic performance of PMSM can be effectively improved,thus improving the information transmission quality of the continuous wave mud pulser.