LAUSR

Abstract: This work describes an online auto-adjustment of the lead-lag Power System Stabilizer (PSS) parameters. The implemented self-tuning technique adjusts the Conventional Power System Stabilizer (CPSS) gain amplifier or one of its time constants based on generator speed gradient, in order to enhance the stability of Single-Machine Infinite Bus SMIBS and multimachine power systems. The proposed Self-Tuned Power System Stabilizer (STPSS) parameters are updated according to the speed variation (gradient).Therefore it is more robust than the CPSS when subjected to large disturbances. The particularity of this controller is that it varies its damping coefficient in real time according to the variation of its parameters (gain or time constant). On the other hand, this PSS does not vary its parameters in the steady state for a given load, and behaves like a simple CPSS. However, if there is a disturbance, the PSS reacts to create the necessary torque by auto-updating its parameters according to the variation of the speed gradient. Simulations are carried out using the proposed STPSS to show that it consistently gives a stable response with an acceptable overshoots and settling times on speed deviation. The proposed PSS is a good choice among conventional PSSs (easy to implement but under-performing) and other adaptive PSSs (high-performing but very complex).