Low frequency stability of hydro-generator-connected power system

Abstract

In the search for clean energy sources in the world, hydroelectricity is the most widely used form of renewable energy. It accounts for 16 percent of global electricity consumption in 2010. Indeed, a spike in the use of hydroelectricity was observed between 2003 and 2009.Earlier research into this area had investigated the effects of hydro-turbines and load on power system. By comparing the results of various designs and parameter settings of the speed governor control system, the study had demonstrated that the hydro-turbine, speed governor and the frequency-sensitive load do impact on the system low frequency stability margin. The speed governor control system needs to be calibrated properly to avoid instability.

The purpose of this project is to expand on previous research, by carrying out an analytical analysis of the closed-loop control system. All the parameters in the speed governor are varied to obtain a more accurate response of the system. In comparing the different simulation results and parameter settings, it clearly shows which parameter can influence the system in a specific manner. Instability can therefore be avoided in future designs to enable better system performance.