基于 GMDH 建模的蒸汽发生器水位重构

摘要

Falsehood or forfeiture occurs frequently on the water level indicating meters of the steam generator ,and there is no appropriate way that can precisely identify the water level but through the experience of the operator on that condition ,which griev-ously affects the judgment of the operator on operation state of the nuclear power plant . GMDH is a flexible and normally used method to establish complicated non-linear large system mathematics model , which makes good effects when dealing with non-linear objects .A method reconstructing the water level of steam generator with GMDH in the circumstance that the crevasse of primary stream pipeline appeared was described .In comparison with the emulation results ,it shows that GMDH can reconstruct the water level of steam generator accurately .The outcome can meet the practical needs and give guidance on the safe operation of the marine nuclear power plant .%蒸汽发生器水位指示仪表出现虚假指示或丧失指示的情况时有发生，而目前又没有很好的方法实现蒸汽发生器水位的重新标定，主要靠经验来进行判断，所以当事故或故障发生时严重影响操纵员对核动力装置运行情况的判断。自组织理论模型（GMDH）是建立复杂非线性大系统数学模型十分灵活而通用的方法，在处理复杂非线性对象中能得到很好的效果。本文以主蒸汽管道破口事故下重构蒸汽发生器水位为例，提出了用 GMDH 重构蒸汽发生器水位的方法，并与仿真结果进行对比。结果表明， GMDH对蒸汽发生器水位重构的相对误差小、精度高，满足实际需要，能为船用核动力装置的安全运行做出指导。