核电站控制棒电源系统发电机失磁故障解析  

Analysis of Generator Loss of Field Fault in Nuclear Power Plant Control Rod Power System

作　　者：肖项涛 郝亮亮[1] 梁郑秋 何鹏 吴鹏飞 Xiao Xiangtao;Hao Liangliang;Liang Zhengqiu;He Peng;Wu Pengfei(School of Electrical Engineering Beijing Jiaotong University,Beijing 100044 China;Liaoning Hongyanhe Nuclear Power Co.Ltd,Dalian 116001 China;Yangjiang Nuclear Power Co.Ltd,Yangjiang 529599 China)

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]辽宁红沿河核电有限公司,大连116001 [3]阳江核电有限公司,阳江529599

出　　处：《电工技术学报》2023年第3期770-780,共11页Transactions of China Electrotechnical Society

基　　金：中广核集团公司科技项目(3100077013);中央高校基本科研业务费项目(2020JBM070)资助。

摘　　要：核电站控制棒电源(简称棒控电源)是控制棒驱动机构的唯一供电系统,确保该系统的安全可靠运行对提高核电站安全性具有重大意义。实际运行的棒控电源系统中发电机的失磁保护判据原理简单,现场发生了多起失磁保护失配事件,且棒控电源系统中发电机的运行状态不同于常规并网发电机;为了有效解决失磁保护失配问题,需对棒控电源系统中发电机的失磁故障进行重新解析。首先,根据转差率和功角特点将失磁发展历程划分为等功角阶段、异步运行阶段和周期异步运行阶段;其次,以发电机等效电路及相量图为基础,以q轴电动势为切入点,结合发电机基本方程,由各阶段q轴电动势的变化解析得到各电气量稳态表达式;最后,通过实际机组的失磁实验数据以及基于PSCAD平台的失磁故障仿真,全面验证了解析结果的正确性。该文给出的失磁故障解析过程为棒控电源系统发电机失磁保护方案的制定奠定了理论基础。Nuclear power plant control rod power is the only power supply system of control rod drive mechanism, to ensure the safe and reliable operation of this system is of great significance to improve the safety of nuclear power plants. The principle of loss of field protection is simple, and many mismatch events of loss of field(LOF) protection have occurred on site;the operation state of the control rod power system generator is different from that of the conventional grid-connected generator;In order to effectively solve the loss of field protection mismatch problem, this paper has carried out the qualitative analysis and quantitative analysis of the loss of field fault of the generator in control rod power system.Firstly, it is assumed that the RAM unit has sufficient reactive power support capacity and ignores the magnetic leakage between stator and rotor and the sub transient process caused by damping winding, and the general expression of longitudinal potential is obtained on the basis of the equivalent circuit of RAM system and the mathematical model of generator. Since the variation quantity of power angle of fault-unit essentially reflects the accumulation of the speed difference between two units in time dimension, the loss of field development process is divided into equal power angle phase, asynchronous operation phase and periodic asynchronous operation phase according to the slip rate and power angle characteristics. Fault-unit generator can be regarded as synchronous operation in equal power angle phase, while normal-unit generator can be regarded as synchronous operation in asynchronous operation phase and periodic asynchronous operation phase.After that, according to the segmentation method of the loss of field process of RAM units and taking the longitudinal potential as the starting point, the analytical expressions of electrical quantities in each phase are obtained from the longitudinal potential variation law in each stage and the basic equation of generator. The specific analytical process is gi

关 键 词：核电站控制棒电源系统 发电机失磁 故障解析 故障分段 

分 类 号：TM341[电气工程—电机]