抄録
The modular high temperature gas-cooled reactor (MHTGR) is a representative small modular reactor (SMR) and has been received a lot of attention due to its virtues of inherent safety and strongly efficient energy source. Although the existing PID control law can guarantee satisfactory closedloop stability, the control performance of the NSSS needs to be further optimized. Motivated by this, two dynamic matrix control (DMC) with cascade structure are presented to improve both thermal power and live steam temperature of the MHTGR-based nuclear steam supply system (NSSS). The thermal power is optimized by the first DMC through adjusting the set-point of normalized neutron flux. The second DMC is then designed based on the integration of the NSSS, the PID and the first DMC to improve the steam temperature response by adjusting the feedwater flowrate. Finally, the DMCs are applied to the NSSS module power control, whose implementation is given by forming three cascade control loops with the PID in the inner loop for stabilization and with the DMCs in the middle loop and outer loop for optimizing thermal power and live steam temperature, respectively. Numerical simulation results show the satisfactory improvement of both thermal power and live steam temperature responses.
