汽轮机负荷速降工况下核岛最终功率整定值触发逻辑的优化

Optimization of logic for final reactor power setting value under turbine rapid load drop condition

在国内核电厂现有的西门子汽轮机控制逻辑中,存在一种特殊工况,该工况下机组未解列,但汽轮机电功率突降,调节系统触发快速降负荷,这种速降负荷的状态未传递给反应堆,反应堆无法触发最终功率整定值,存在反应堆意外停堆的风险。针对以上问题,本文以华龙一号堆机匹配方案为研究对象,分析汽轮机在负荷速降工况下,反应堆最终功率整定值的计算过程,提出一种堆机接口控制逻辑优化方案。经过模型推演,证实优化方案可有效解决现有问题,进一步提升反应堆安全性。

In the current Siemens turbine control logic of nuclear power plant,a special condition is existed,in which the unit does not disconnect with the grid,but the turbine electric power drops suddenly,and the control system triggers rapid load reduction.This state of rapid load reduction is not transmitted to the reactor,and the reactor cannot trigger the final reactor power setting value,there is a risk of accidental reactor trip.In view of the above problem,this thesis takes reactor-turbine interface of HPR1000 as the study case,analyzes the calculation process of the final reactor power setting value under the rapid load drop condition,and puts forward an optimal scheme of the reactor-turbine interface.Through the model simulation,it is proved that the optimized scheme can effectively solve the existing problem and further improve the reactor safety.