Some issues of microprocessor-based power system stabilizer implementation

In this paper, we present our experience gained through implementation of the IEEE PSS2B type of power system stabilizers (PSSs). The paper describes a particular case of implementing this type of PSS in microprocessor-based digital voltage regulator with limited processing resources. The following issues have been elaborated: (i) choice of sampling time and its influence on the performance of the PSS and on the processor utilization, (ii) selection of the lead-lags time constants and their influences on the noise amplification and (iii) scaling associated with the integer arithmetic. The above mentioned problems have been analyzed by simulations and experimentally on a laboratory power plant, and appropriate solutions have been proposed. Finally, the PSS2B has been implemented on real power plants, and a simple method for field verification of tuned PSS2B parameters is explained.