Robust Power System Stabiliser Design Based on m – Synthesis.

Abstract

One of the most important problems arising from large scale power systems is the low frequency oscillation. Excitation control or Automatic Voltage Regulator (AVR) is well known as an effective means to improve the overall stability of the power system. Power System Stabilisers (PSS) are introduced in order to provide additional damping to enhance the stability and the performance of the electric generating system. The output of the PSS as supplementary control signal is applied to the machine voltage regulator terminal. Conventional PSS have been widely used in power systems. Such PSS ensures optimal performance only at a nominal operating point and does not guarantee good performance over an entire range of the system operating conditions. Several techniques have been proposed for the design of more robust PSS structures. To guarantee the desired performance, this paper describes the control design models of a PSS based on µsynthesis, µ-analysis and H∞ control methods, which is returned when the system configuration changes. The control law is presented in both frequency domain and the time domain