Abstract
Heat pipe cooled reactors (HPRs) offer the potential to achieve load-following control without the need for control rods or drums, thereby simplifying the control system. However, during load-following operation, HPRs experience fluctuations in temperature, which can impact safety. Limited research has focused on mitigating temperature fluctuations of HPRs during dynamic power regulation leveraging their inherent load-following capabilities. This study examines the characteristics of an HPR with closed Brayton Cycle (CBC), and develops a load-following control algorithm. A simplified CBC model is proposed to facilitate control strategy analysis. Model predictive control (MPC) is employed to suppress temperature fluctuations, revealing that the dynamic response of output power under MPC resembles that of a first-order inertial system. Consequently, a power control algorithm based on first-order inertial feedforward control is introduced. Simulation results demonstrate that the proposed algorithm, with a time constant ranging between 500 and 1000 s, significantly mitigates temperature and power fluctuations in HPRs during load-following dynamic power regulation.
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