液态熔盐堆堆芯功率模糊PID控制

Fuzzy-PID Control for Core Power of Liquid Molten Salt Reactor

液态熔盐堆采用熔融氟化盐为燃料,燃料熔盐出口温度是衡量熔盐堆安全的重要指标。通过堆芯功率控制可实现燃料熔盐出口温度控制。将液态熔盐堆堆芯划分成内区和外区,并基于能量守恒原理建立堆芯非线性模型,采用微扰理论对非线性模型进行线性化。基于堆芯线性化模型,采用模糊比例-积分-微分(PID)控制器设计堆芯功率控制系统。以熔盐增殖堆(MSBR)为例,开展堆芯功率控制仿真。结果表明,引入10-3、2×10-3阶跃反应性时,模糊PID控制器可以减小系统响应的上冲幅度和超调量,并且在堆芯功率发生了较大的负荷变化时,模糊PID控制器可以对堆芯功率的变化实现良好跟踪。故所采用的模糊PID控制器具有良好的动态性能,可实现对堆芯功率的良好控制。

Molten fluoride is used as the fuel in liquid molten salt reactors. The outlet temperature of the molten salt is an important index to measure the safety of the molten salt reactor. The control of the molten salt outlet temperature can be realized by core power control. The core of the liquid molten salt reactor is divided into inner and outer regions. Based on the principle of energy conservation, the core non-linear model is established, and the non-linear model is linearized by perturbation theory. Based on the core linearization model, the core power control system is designed by using the fuzzy-PID controller. Taking Molten Salt Breeder Reactor(MSBR)of molten salt breeder reactor as an example, core power control simulation is carried out. The results show that when the step reactivity of 10-3 and 2×10-3 is introduced, the fuzzy-PID controller can reduce the amplitude and overshoot of the system response. and the load of the reactor core power changes greatly, the fuzzy-PID controller can track the change of the reactor core power well. Therefore, the fuzzy PID controller has good dynamic performance and can achieve good control of the reactor core power.