Distributed power system stabiliser for multimachine power systems

Power system stabiliser (PSS) widely used to enhance the stability of power systems is based on the feedback of rotor speed error with respect to the rated value. However in many occasions, after the disturbances, it is desirable to re-synchronise all generators first rather than to make all generators back to the rated 50/60 Hz immediately. This study proposed a distributed power system stabiliser (DPSS) that aims to synchronise generators by the feedback of relative rotor speed errors of each generator with respect to its neighbouring generators. The proposed DPSS is analysed on a double machine infinite bus system, and shows that the proposed DPSS can enhance the stability of power systems by increasing the synchronising torque. To evaluate the efficiency of proposed method, the proposed DPSS is tested on three benchmark systems. The simulation results verify the efficacy of theoretical analysis, show the outperformance of DPSS over other PSSs, and demonstrate the superiority of re-synchronising generators over making them back to rated value in the post-fault. Communication issues have also been evaluated, which demonstrates the robustness of DPSS against both communication failures and random delays.