汽轮机超加速度保护问题研究以及优化策略

The research of acceleration control protection of turbine control system

汽轮机超速保护和超加速度保护逻辑在防止汽轮机转速飞升和设备保护起到重要的作用。首先介绍了汽轮机转速的超加速度保护的设计原理,并基于已出现的由于超加速保护控制导致的停机事件,分析超加速保护逻辑容易出现的问题。针对超加速保护的抗干扰能力差的问题,通过极限工况下加速度理论计算和极限工况的转速超调量计算,结合已有的甩负荷试验数据,提出合理可行的优化办法。根据分析,按所提出的方案修改后的转速闭锁逻辑能够在很大程度上增强汽轮机超加速逻辑的抗干扰性能,对解决保障核电厂多机组整体的安全稳定运行具有重要的意义。

The overspeed protection and acceleration protection logic play an important role in preventing the speed of the turbine from fast increase and protecting the equipment.This paper introduces the logic principle of turbine speed acceleration control,and analyzes the problems of acceleration protection logic based on the shutdown events caused by acceleration protection control.Aiming at the problem of poor anti-interference ability of acceleration protection,through the analysis of acceleration theory under extreme conditions and speed overshoot under extreme conditions,combined with the existing load rejection test data,a reasonable and feasible optimization method is proposed.According to the analysis of this paper,the modified speed locking logic can increase the anti-interference degree of steam turbine acceleration logic to a certain extent,which is of great significance to solve the site engineering problems of nuclear power plant.