Space nuclear power reactors have the advantages of small size, long service lives and high-power densities. As these characteristics, space nuclear power reactors can meet the high-power demands of spacecraft. To safely and reliably perform tasks in space with a space nuclear reactor, the control technology of the space nuclear reactor is significant. To study the core power control of a space nuclear reactor, a nonlinear model for the TOPAZ-II core is established by the lumped parameter method and principle of point reactor modeling. Then, directly based on the core nonlinear model, a fuzzy-PID controller is used to control the core power. Finally, the core power control system is built, and dynamic simulations are carried out with multiple transient conditions. The results show that the fuzzy-PID controller can realize core power control well, and its control effect is better than that of PID controller.

空间核动力反应堆具有体积小，使用寿命长和功率密度高的优点。由于这些特性，空间核动力反应堆可以满足航天器的高功率需求。为了利用太空核反应堆安全可靠地在太空中执行任务，太空核反应堆的控制技术意义重大。为了研究空间核反应堆的堆芯功率控制，利用集总参数法和点反应堆建模原理建立了TOPAZ-II堆芯的非线性模型。然后，直接基于核心非线性模型，使用模糊PID控制器来控制核心功率。最后，构建了核心功率控制系统，并在多个瞬态条件下进行了动态仿真。结果表明，模糊PID控制器可以很好地实现核心功率控制，