Among the three digital dynamic compensation methods that are developed for or applied to the rhodium self-powered neutron detector—the dominant pole Tustin method of the core operating limit supervisory system, the direct inversion method, and the Kalman filter method—the best method is selected. The direct inversion method is slightly improved from the previous version, and the Kalman filter method is proposed. The simulation results show that the direct inversion method is better than the dominant pole Tustin method, but the best compensation results can be obtained from the Kalman filter method. The direct inversion method gives better results than the dominant pole Tustin method because it does not contain the assumption of a single pole and zero. The Kalman filter method is the best among the three methods because it uses the information of previous time steps throughout its estimation process.