Exciter System Identification and Automatic Tuning of Linear Combination-Type Power System Stabilizers Using Frony Analysis

Abstract

The objective of this paper is to present a new automatic tuning method of power system stabilizers using Prony analysis. Prony analysis is used for detecting oscillation frequency, damping, phase, and amplitude from power oscillation waveform data. By applying the method to the waveform data of stabilizing signal and internal induced voltage, exciter system phase lag and oscillation frequency can be identified, and control parameters are decided using the identified values.
Linear combination-type power system stabilizers are effective for dampimg low frequency oscillations using two control input signals, generator power and bus voltage frequency. The control parameters can be directly derived from the oscillation frequency and the excitation system phase lag without using phase compensation.
Simulation results show that the proposed method is effective both in one machine-infinite bus system and in a multimachine system. The method can be used for off-line controller design and also for on-line adaptive control.