【作者】 朱兆俊；

【导师】 戴胜华；

【作者基本信息】 北京交通大学 ， 交通信息工程及控制， 2011， 硕士

【摘要】 本论文是基于微机监测系统的研究而展开的。全文主要对转辙机功率测量进行研究与设计。其中参照最新发布的国际功能安全标准IEC61508,进行了道岔转辙机功率采集的风险评估,并完成了传感器的设计制作。本文简要介绍了IEC61508标准中的风险分析原理和风险分析方法,并对标准提出的三种风险评估方法进行了比较分析。采用定性的风险评估方法对该功率采集器进行风险评估。得出系统需要达到SIL 1的等级要求。硬件设计以嵌入式处理器STM32F103xx为主要控制芯片。该转辙机功率采集器可分别对道岔系统的电量进行测量,包括电压、电流及功率的测量；并可通过判断开关量来输送功率曲线。输出通过基于Modbus RTU协议的RS-485通信接口传送,可以与PLC、RTU等终端直接组网。程序中加入零相位数字低通滤波器FRR。该数字滤波器可在IIR数字滤波器的基础上实现零相移,以解决其在滤波中相频特性的非线形。有效滤除电网电压波形畸变和电机负载变化引起的电流波形畸变。按照IEC61508标准的要求,对数据采集系统的硬件失效概率率进行了估算。通过计算,该系统的安全功能的安全完整性等级满足SIL 1的设计要求。完成后的功率采集器,在实验室和模拟现场进行了测试,运行稳定,传统监测功能在性能方面得到了提高。在结论中总结了本论文的主要工作内容,并指出了不足之处和进一步的工作的方向。更多还原

【Abstract】 This thesis is based on the research of microcomputer monitoring system.Mainly research and design the switch machine power measurement.It refers to the latest international functional safety standard-IEC61508, assessing the risk of switch machine power acquisition, and completed sensor design.This thesis simply introduces the risk analysis principles and risk analysis methodologys in the IEC61508 standard, comparing and analysising of three kinds of risk assessment methods that are proposed by the standard. Qualitative risk assessment methodology is used for the power collector in risk assessment. This system needs to achieve SIL 1.Using embedded microprocessor STM32F103xx as the main control chip for hardware-circuit design.This power collector can measure the electrical parameters of the turnout system,including the voltage,current and power,it can transmit power graph by judge the switch.It send data through the RS-485 communication interface that bases on Modbus RTU protocol,with PLC, RTU and other terminals to networking.Adding zero-phase digital low-pass filter FRR to program.This digital filter that bases on IIR can achieve zero phase shift.To deal with the non-linear phase frequency in its filter.It Effectively filter out the grid voltage waveform distortion and the current waveform distortion caused by the motor load change.In accord with the requirements of IEC61508 standard,estimating the hardware failure rate of the data acquisition system.By calculating, the system’s safety integrity levels of security features has achieved SIL 1.The completed power collector works well in testing both in the laboratory and the simulated field.The traditional functions are improved.The thesis concludes the main job in the last part, and introduces the deficiencies and the improvement rooms in the continued work.更多还原