The modern control methods, such as linear optimal control and non-linear control, for the generator excitation systems in state space have been dramatically developed during the past few decades. However, the lack of frequency-domain testing methods baffles the engineering applications of the modern controllers. In this study, a practical parameter configuration method as well as its frequency-domain testing method is proposed for the industrial non-linear robust power system stabiliser (industrial NR-PSS) for large synchronous generators. Furthermore, a two-machine, infinite-bus system is used to verify the effectiveness of the proposed method and the comprehensive performances of the industrial NR-PSS. A series of experiments are carried out on the real-time digital simulator to confirm its better performance comparing with the proportion integration differentiation (PID) controller and the conventional power system stabiliser (PSS). All the simulation and experimental results demonstrate that the industrial NR-PSS can improve system damping characteristic, enhance large disturbance stability and so has promising prospects in the applications to excitation systems.