引用本文:肖项涛,郝亮亮,王泽民,何鹏.核电站控制棒电源系统相复励发电机短路故障的解析计算[J].电力自动化设备,2023,43(11):124-132
XIAO Xiangtao,HAO Liangliang,WANG Zemin,HE Peng.Analytical calculation of short circuit fault of phase compound excitation generator in control rod power system of nuclear power plant[J].Electric Power Automation Equipment,2023,43(11):124-132
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核电站控制棒电源系统相复励发电机短路故障的解析计算
肖项涛1, 郝亮亮1, 王泽民1, 何鹏2
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,辽宁 大连 116001
摘要:
针对核电站控制棒电源系统,现有保护仅采用以额定电流为定值的定时限过流保护作为短路后备保护,导致该系统已发生多起过流保护抢先动作与失磁保护失配的事件。解决保护失配问题的关键在于对控制棒电源系统发电机短路故障电流的准确解析,解析重点在于考虑发电机实际采用的相复励无刷励磁方式对故障电流的影响,而相复励励磁电流由并励电压对应的励磁分量和复励电流对应的励磁分量合成产生。经过合理的假设与模型简化,结合发电机基本方程和励磁系统数学模型,推导得到了并励电压分量作用下的三相短路电流。引入复励电流分量作用,根据励磁电流变化对短路电流进行修正,得到了包含暂态分量和稳态分量的相复励发电机三相短路电流时域解析表达式。由正序等效定则扩展得到两相短路电流的时域解析表达式。基于PSCAD/EMTDC平台建立了控制棒电源系统电磁暂态模型,对理论分析结果进行了验证,进一步对保护优化方法进行了讨论。
关键词:  核电站控制棒电源系统  相复励  发电机短路故障  故障解析
DOI:10.16081/j.epae.202301013
分类号:TM31
基金项目:中广核集团公司科技项目(3100077013);中央高校基本科研业务费专项资金资助项目(2020JBM070)
Analytical calculation of short circuit fault of phase compound excitation generator in control rod power system of nuclear power plant
XIAO Xiangtao1, HAO Liangliang1, WANG Zemin1, HE Peng2
1.School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;2.Liaoning Hongyanhe Nuclear Power Co.,Ltd.,Dalian 116001, China
Abstract:
For the control rod power supply system of nuclear power plant, the existing protection only uses the fixed time overcurrent protection with rated current as the backup protection for short circuit fault, which has led to several events of overcurrent protection preemptive action and mismatch with loss of excitation protection in this system. The key to solve the protection mismatch problem is to accurately analyze the short circuit fault current of generator in the control rod power supply system. The key point of the analysis is to consider the influence of the phase compound brushless excitation mode actually adopted by generator on the fault current, and the phase compound excitation current is composed of the excitation components corresponding to the shunt excitation voltage component and the compound excitation current. Through the reasonable assumption and model simplification, combined with the basic equations of the generator and the mathematical model of the excitation system, the three-phase short circuit current under the shunt excitation voltage component is derived. The compound excitation current component is introduced to modify the short circuit current according to the variation of excitation current, and the time-domain analytical expression of three-phase short circuit current of phase compound excitation generator including transient component and steady-state component is obtained. The time-domain analytical expression of two-phase short circuit current is obtained by extending the positive sequence equivalent rule. The electromagnetic transient model of the control rod power supply system is established based on PSCAD/EMTDC platform to verify the theoretical analysis results, and the protection optimization method is further discussed.
Key words:  nuclear power plant control rod power system  phase compound excitation  short circuit fault of generator  fault analysis

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