【摘要】 随钻测井系统中需要采用大功率涡轮发电机为井下系统提供动力电源。目前采用的大功率电源采用整流稳压来实现，整流后直流电压随泥浆转速的升高而升高，但是其稳压模块一般在有限区间内使用，因此通常采用多种叶导轮组合，在实际作业中需要根据作业井场泥浆泵的排量范围调整不同的叶导轮组合以改变泥浆在叶轮上的流量进而使直流转换模块满足其区间要求。本文通过理论分析与仿真计算，应用PID闭环控制模型，完成了基于PWM调制的稳压电源模型设计，分析了其在60-150Vrms交流电压输入时的主动控制整流特性、转换效率及负载调整响应时间等几方面的特性。研究结果表面，该稳压电源可实现宽范围交流输入时的主动整流，确保总线电压始终满足设计要求且效率较高、负载适应性好。因此，基于该稳压电源，可实现一套叶导轮组合满足不同泥浆排量范围下的宽范围交流电输入的作业需求，提高在不同作业环境下的适用性。更多还原

【Abstract】 High-power turbine generators are needed in logging-while-drilling systems to supply power to the downhole instruments. The current high-power power supply system employs a rectifier-voltage regulator, and the rectified direct-current(DC) voltage increases with the mud flow rate. Moreover, as voltage regulator modules operate in limited ranges, various impellers and guide wheel combinations are generally used to generate electronic power. In practice, it is necessary to adjust different impeller and guide wheel combinations according to the mud pump discharge rate at the operation well site to change the flow rate of the mud on the impeller to meet the voltage range requirements of the DC conversion module. This study uses theoretical analysis and simulation calculations, applies a proportional–integral–differential closed-loop control model, and completes the design of a power supply system modulated and stabilized using pulse-width modulation(PWM). Moreover, the study involves analyzing its active-control rectification characteristics, conversion efficiency, and load-adjustment response time with an alternating-current(AC) voltage input of 60–150 Vms. The results suggest that the regulated power supply system can achieve active rectification over various AC inputs, ensuring that the bus voltage always meets the design requirements with high efficiency and satisfactory load adaptability. Therefore, a set of impeller and guide wheel combination based on this stabilized, modulated power supply system can be achieved to meet the operational needs of various AC power inputs under different mud flow ranges, improve applicability in different working wells.更多还原