【作者】 李林；

【导师】 任士焱；

【作者基本信息】 华中科技大学 ， 电气信息检测技术， 2009， 硕士

【摘要】 直流大电流参考标准装置闭环自动控制系统设计的主要目的,是在保证装置稳定可靠运行的前提下,尽可能地提高系统的精度,以实现对直流大电流监测的高准确度以及更好地对传递标准装置、工作标准装置进行校验。本文主要是对6KA直流大电流参考标准装置闭环自动控制系统进行研究设计。文章首先论述了直流大电流计量标准装置的工作原理安匝平衡,指出了反馈随动控制系统在其中的重要作用。根据工作原理,设计了包括第一级交流放大环节、滤波环节、第二级交流放大环节、相敏解调环节、直流放大环节以及功率放大环节在内的反馈随动控制系统硬件电路。其次,本文根据实际硬件电路参数推导出反馈随动控制系统中各个环节的传递函数,由此得到系统的开环传递函数,绘出系统的波特频率特性曲线,并利用超前相位校正方法对系统进行校正,使得系统稳定。借助于MATLAB/SIMULINK,本文建立了反馈随动控制系统的系统仿真模型,并通过仿真实验验证了反馈随动控制系统硬件电路设计的正确性。接着,本文深入研究了滞后相位校正方法和积分漂移现象,据此设计了近似比例-积分调节器,在保证了原反馈随动控制系统稳定的前提下,使得装置的理论精度获得了较大地提高,经仿真实验验证,可达1.14155×10^-7。最后,得出结论:本课题所设计的6KA直流大电流参考标准装置能实现较高精度且各项性能良好,具有较好的工业应用价值。更多还原

【Abstract】 The main purpose of the closed-loop automatic control system in the reference standard devices for heavy direct current is to increase the system accuracy as much as possible on the basis that the good performance of the devices,including stability and reliability,can be ensured. This will cause the monitoring of the heavy direct current achieve high preciseness and the calibration of the transfer standard devices and working standard devices better.The focus of this article is the research and design of the automatic control system in the reference standard devices for 6000 Amperes heavy direct current.The principle of the metering standard device for heavy direct current and the importance of the feedback follow-up control system has been discussed in the first part of this article. On this basis,the hardware circuit of the feedback follow-up control system including the link of filter,the link of alternating current amplifier,the link of phase-sensitive demodulator,the link of direct current amplifier and the link of power amplifier has been designed.Next,the transfer function of each link has been deducted,thus,the open-loop transfer function of the system has been derived and the BODE frequency characteristic curve of the system has been drawn. Then,we corrected the system using the method of lead phase correction in order to make sure the stability of the system. With the help of the software named MATLAB/SIMULINK,the system simulation model of the feedback follow-up control system has been constructed,and the correctness of hardware circuit of the feedback follow-up control system has been tested and verified by making simulation experiment.Then,the lag phase correction and the integral drift phenomenon have been introduced in detail,using this method,the approximate proportional-integral regulator has been designed,assuring the stability of the original feedback follow-up control system prerequisite conditions , to increase the system accuracy greatly , reach 1.14155×10^-7 through verification of the simulation experiment. Finally,we get the conclusion that the reference standard device for 6000 Amperes heavy direct current can achieve high accuracy and have a good operational performance,this make it have better value for industrial application.更多还原