核电站驱动机构性能测试软件设计与实现

发布时间：2018-07-03 01:06

本文选题：核电站 + 驱动机构　；参考：《电子科技大学》2014年硕士论文

【摘要】：目前,国内核电站控制棒驱动机构大多数均为磁力提升型驱动机构(CRDM)。若驱动机构发生故障或性能退化,则可能产生滑棒、卡棒等事故,从而影响反应堆的安全经济运行。由于驱动机构安装在高温高压的密闭环境中,无法直接对其进行在线实时监测。为尽早发现其性能退化的情况以便于及时进行调整,需定期对驱动机构性能进行测试。以往由于缺少适用的试验装置,相关试验由试验人员采用通用测量设备测取数据并进行人工判断。相关测试在停堆换料期间进行,由试验人员临时搭建试验平台,获取试验波形,通过人工分析电流时序、振动信号等方式来判断驱动机构性能。本课题采用虚拟仪器技术,使用LabVIEW程序开发平台,设计了驱动机构电流监测、振动信号分析、落棒波形判断与抓取、落棒时间计算、棒位线性度分析、报表生成与存储、历史数据调用等功能模块,实现了驱动机构运行性能的综合分析。本课题通过伪变化判断滤除及棒位一致性判断方法,自动消除实测棒位跳变输入,保留其真实值,进而进行控制棒全行程内的“给定棒位-实测棒位”线性度自动分析及判断。利用控制棒下落速度与棒位探测器原边线圈感应电压所存在的对应关系,通过“起始斜率反推法”及“幅值-近似匀速下降段复合法”等算法精确判断控制棒在下落期间所处的不同阶段,进而实现对控制棒落棒时间的自动测量。并进行落棒时间符合度分析及不同控制棒落棒时间的横向综合比较分析。利用驱动机构线圈电流波形在驱动机构吸合动作点所呈现的特征点变化及线圈电流不同阶段的变化特性,采用分段滤波、电流动作点凹槽捕捉、电流平台微阶跃捕捉等分析方法完成驱动机构性能监测。对驱动机构重要性能指标进行监测,自动判断驱动机构运行方向、分析其电流时序、根据运行电流获取驱动机构相关吸合点并结合驱动机构振动信号进行综合分析、自动计算驱动机构电流转换时间、对驱动机构电流平台进行稳定性分析、自动计算驱动机构动作点并进行合理性分析。并根据上述分析结果对驱动机构运行性能进行综合分析,进而对驱动机构可能发生的性能退化进行预判。
[Abstract]:At present, most of the control rod actuators in domestic nuclear power plants are magnetic lifting actuators (CRDM). If the driving mechanism fails or the performance is degraded, the accident of sliding-rod and sticking rod may occur, which will affect the safe and economical operation of the reactor. Because the drive mechanism is installed in the closed environment of high temperature and high pressure, it can not be directly monitored in real time. In order to detect the performance degradation as soon as possible for timely adjustment, the performance of the drive mechanism should be tested regularly. In the past, due to the lack of suitable test equipment, the relevant tests were measured by universal measuring equipment and judged manually. The related test is carried out during the period of shutdown and reloading. The test platform is set up temporarily by the experimenter to obtain the test waveform and to judge the performance of the driving mechanism by manually analyzing the current sequence and vibration signal. Using virtual instrument technology and LabVIEW program development platform, the paper designs driving mechanism current monitoring, vibration signal analysis, rod drop waveform judgment and grab, rod drop time calculation, rod position linearity analysis, report generation and storage. The function module of historical data transfer realizes the comprehensive analysis of the performance of the driving mechanism. In this paper, the method of pseudo-change judgment filtering and consistency judgment is used to automatically eliminate the jump input of measured rod position, to retain its true value, and then to analyze and judge automatically the linearity of "given rod position-measured rod position" in the whole stroke of the control rod. Based on the relationship between the falling velocity of the control rod and the inductive voltage of the primary coil of the rod position detector, By means of "initial slope backstepping method" and "amplitude-approximate uniform descent section compound method", the different stages of the control rod in the falling period are accurately determined, and the automatic measurement of the control rod drop time is realized. The consistency analysis of drop-off time and the lateral comprehensive analysis of different control rod drop-off time are carried out. By using the characteristic point change of the current waveform of the driving mechanism coil at the driving mechanism suction action point and the variation characteristics of the coil current in different stages, the section filter is adopted, and the current action point groove is captured. The current platform microstep capture and other analysis methods are used to monitor the performance of the drive mechanism. Monitoring the important performance index of the driving mechanism, automatically judging the running direction of the driving mechanism, analyzing its current sequence, obtaining the relevant suction points of the driving mechanism according to the running current and synthetically analyzing the vibration signal of the driving mechanism. The current conversion time of the driving mechanism is calculated automatically, the stability of the current platform of the drive mechanism is analyzed, the action point of the driving mechanism is calculated automatically and the rationality is analyzed. According to the above analysis results, the performance of the driving mechanism is comprehensively analyzed, and the possible performance degradation of the drive mechanism is forecasted.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM623;TP311.52

【共引文献】