New Analytical Method for Studies of Enhancement of Power System Dynamic Stability by Application of Adjustable-Speed Generating System

Abstract

Adjustable-speed pumped storage generating systems of large capacity have been newly installed in power systems with recent technologies of power electronics. These new generating systems contribute not only to frequency regulation of power system at night by means of input power change as results of rotor speed control, but also to enhancement of power system stability by fast control of voltage and power.
New analytical method based on extended Heffron-Phillips model was developed in order to support designing of power system stabilizer which is used to improve dynamic stability of the synchronous generators located in the vicinity of the adjustable-speed generating system. Systematic approach based on the new analytical method is shown with numerical examples, explaining how to construct the additional power system stabilizing controller as well as main controller of the adjustable-speed generating system.