Study on switching control of PWR core power with a fuzzy multimodel

Abstract As a reactor core has time-varying and nonlinear characteristics, it is difficult to achieve an ideal control effect with traditional control theory. To optimize the core power control performance, a compound control scheme is formulated that is composed of multiple controllers by weighting and switching. Firstly, the nonlinear model of a reactor core is transformed into a transfer function model. With the triangular membership function, five transfer function models under different core powers are weighted to establish the core fuzzy multimodel. Secondly, based on the fuzzy multimodel, direct switching principle and fuzzy switching principle are used to design the core power composite controller. Finally, dynamic simulation is carried out to determine the effectiveness of the core fuzzy multimodel and the performance of the switching control system. The result shows that the core fuzzy multimodel is effective and that two kinds of composite controllers can achieve good control of core power.