Low frequency oscillations in power systems: A physical account and adaptive stabilizers

Abstract

This paper presents a physical explanation of the phenomenon of low frequency oscillations experienced in power systems. A brief account of the present practice of providing fixed gain power system stabilizers (r, ss) is followed by a summary of some of the recent design proposals for adaptive PSS. A novel pss based on the effort of cancelling the negative damping torque produced by the automatic voltage regulator (AVR) is presented along with some recent studies on a multimachine system using a frequency identification technique.

Identification and damping of low-frequency oscillations based on WAMS data and the revisited residue method – part I

“…A further step after identification is the damping of dangerous oscillations to improve stability, to achieve this, engineers and scientists have indicated the effectiveness of using PSS device [1][2][3][4]10]. But it is not enough just to install the PSS in a power plant, its PSS parameters must be properly configured.…”

“…Ensuring the stability of the electric power system is critical. When electrical connections appear between large electric power systems (generation sources), challenges related to non-damped electromechanical low-frequency oscillations (LFOs) appear for the System Operator [1][2][3]. These oscillations can result from a sudden increase in load, a shutdown of a large generator, or a change of synchronous generator operation or power plant due to an incorrect setting of the generator excitation system [4,5].…”