Research on Rod Position Calculation Method of Multi-coil Inductive Rod Position Detector Based on Principle of Segmented Coil
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摘要: 棒位探测器是核反应堆中棒位检测的主要设备，其检测精度直接影响核反应堆的安全正常运行，因此针对核反应堆用多线圈电感式棒位探测器提出了一种高精度棒位解算方法，分析了多线圈电感式棒位探测器的结构与测量原理，并基于有限元方法对多线圈电感式棒位探测器的动态特性进行了分析，结果表明每段检测线圈的感应电压存在一段特定区域，该区域的电压峰值呈线性变化。基于该特性提出了多线圈电感式棒位探测器的分段线圈的棒位解算方法，通过实时采集控制棒运动在不同位置时每段检测线圈当前周期内峰值，再根据棒位解算区域中感应电压峰值与棒位的关系进行棒位解算。最后，通过ANSYS和MATLAB/ Simulink软件搭建模型对理论分析和棒位解算方法进行验证，仿真结果表明所提棒位解算方法能够使棒位探测器测量误差检测精度<0.2 mm，满足对控制棒进行高精度棒位检测的需求。Abstract: Rod position detector is the main equipment for rod position detection in nuclear reactor, and its detection accuracy is very important to the safety and normal operation of nuclear reactor. Thus, this paper proposes a high precision rod position calculation method for multi-coil inductive rod position detector used in nuclear reactor. The structure and detection principle of multi-coil inductive rod position detector are analyzed, and the dynamic characteristics of multi-coil inductive rod position detector are also analyzed based on finite element method. The results show that the induced voltage of each segmented detection coil has a specific region, where the voltage peak value changes linearly. Based on this characteristic, a rod position calculation method of segmented coils of multi-coil inductive rod position detector is proposed. The peak value of each detection coil in the current cycle is collected in real time when the control rod moves at different positions, and then the rod position is calculated according to the relationship between the peak value of induced voltage and the rod position in the rod position calculation area. Finally, the theoretical analysis and rod position calculation method are verified by modeling with ANSYS and MATLAB/Simulink software. The simulation results show that the proposed rod position calculation method can achieve a detection accuracy of <0.2mm for rod position detector. The detection accuracy meets the requirements of high-precision rod position detection for control rod.
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图 4 感应电压峰值实时提取原理
Figure 4. Principle of Obtaining the Peak Value of Induced Voltage in Real Time
图 5 检测线圈2峰值提取仿真结果
Figure 5. Simulation Results of Obtaining the Peak Value of Induced Voltage of Detection Coil 2
表 1 仿真模型参数
Table 1. Parameters of Simulation Model
参数名 参数值 控制棒半径/ mm 25 控制棒长度/ mm 2100 线圈线径/ mm 0.5 线圈2~19匝数 1000 线圈1和20匝数 1500 激励线圈内径/ mm 73 检测线圈内径/ mm 65 激励电压/ V 10 激励频率/ Hz 50 
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