棒控电流电路的FPGA设计及CRDM电磁分析

发布时间：2018-11-24 11:59

【摘要】：随着现代电子技术的发展，尤其是大规模集成电路的高速发展以及数字集成芯片的出现，由分立元件组成的数字系统的弊端开始显现出来，需要对过去的工业控制系统进行现代化改进。在核电控制系统中，由于最初的核电控制设备源于国外进口，市场没有备件可换，急需进行国产化研制。棒控电流电路在控制棒驱动机构中起着重要的作用，控制着核反应堆的运行状态。电路的稳定性、可靠性直接决定着棒控系统的安全性和可维护性。为了实现核电棒控系统国产化要求，本文研究和设计了基于FPGA控制的棒控电流电路。首先，，本文对反应堆控制棒驱动电流的工作要求做了详细的说明，通过对控制棒驱动机构的磁场分析，阐述了控制棒驱动机构的工作原理：电流流过衔铁，根据电磁感应原理产生磁力，磁力和控制棒重力的相互作用控制反应堆控制棒移动。基于对控制棒驱动机构的工作规范和基本原理的认识，提出以FPGA为核心控制控制棒的设计方案，并使用MATLAB建立了整流电路模型，分析了以FPGA控制IGBT产生可调电流方案的可行性。其次，根据棒控电流电路的控制方法以及PLC控制逻辑，综合设计了由两个IGBT串联的主电路及其驱动电路、闭环控制电路、电流检测电路、电源DC-DC转换电路、稳压电路以及滤波电路。通过模拟电路和数字电路相结合，设计并实现了系统自动调节，输出稳定电流。通过对系统电压电流分析，实现了不同模块之间信号的良好匹配。系统使用CMOS系列芯片，提高了反应速度。使用数字电位器设置和调整系统参数，实现了系统参数与计算机的实时传递，使用FPGA对整个系统进行实时控制，编写了基于Verilog硬件语言的控制程序，使用VC++编写了上位机控制界面。最后，本文在系统PCB设计及机箱布局中，进行了电磁兼容性分析，保证在复杂电磁环境中系统能够正常运行。本文设计的棒控电流电路系统经过模拟负载测试，得到了系统所要求的电流波形，实现了人机交互控制，证明了设计的合理性和正确性。
[Abstract]:With the development of modern electronic technology, especially the rapid development of large scale integrated circuits and the emergence of digital integrated chips, the malpractice of digital systems composed of discrete components has begun to appear. The past industrial control system needs to be modernized and improved. In the nuclear power control system, because the original nuclear power control equipment is imported from abroad, there are no spare parts to replace in the market. Rod-controlled current circuit plays an important role in the control rod driving mechanism and controls the operation state of the nuclear reactor. The stability and reliability of the circuit directly determine the safety and maintainability of the rod control system. In order to meet the requirement of localization of nuclear power rod control system, this paper studies and designs the Rod Control current Circuit based on FPGA control. First of all, this paper describes the working requirements of the control rod drive current in detail. Through the magnetic field analysis of the control rod drive mechanism, the working principle of the control rod drive mechanism is described: the current flows through the armature, According to the electromagnetic induction principle, the interaction between magnetic force and control rod gravity controls the reactor control rod movement. Based on the understanding of the working standard and basic principle of the control rod drive mechanism, the design scheme of the control rod with FPGA as the core is put forward, and the rectifier circuit model is established by using MATLAB. The feasibility of using FPGA to control the IGBT to generate adjustable current is analyzed. Secondly, according to the control method of the Rod current circuit and the PLC control logic, the main circuit and its driving circuit, the closed-loop control circuit, the current detection circuit and the power supply DC-DC conversion circuit are designed. Voltage stabilizing circuit and filter circuit. Through the combination of analog circuit and digital circuit, the system automatically adjusts and outputs stable current. By analyzing the voltage and current of the system, the signal matching between different modules is realized. The system uses CMOS series chips to improve the reaction speed. The system parameters are set and adjusted by digital potentiometer, and the real-time transmission between system parameters and computer is realized. The whole system is controlled in real time by FPGA, and the control program based on Verilog hardware language is written. The upper computer control interface is written with VC. Finally, EMC analysis is carried out in the system PCB design and chassis layout to ensure the normal operation of the system in complex electromagnetic environment. The Rod controlled current circuit system designed in this paper has been tested by analog load, and the required current waveform has been obtained. The human-computer interaction control has been realized, and the rationality and correctness of the design have been proved.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN791

【参考文献】