Modeling and simulation of the speed control system for al-hilla gas turbine power station

Abstract EN

The presented work is a case study for the speed control system of the gas turbine used in Al-Hilla electrical power station.

It is based on the manufacturer data given by the turbine manuals and also on the readings taken from the daily operation sheets of the power generating unit.

The turbine control system is composed of three main loops : start up, temperature control, and speed control loops.

A general study for the startup and temperature control loops were performed, then a detailed study for the speed control system with estimation of the system parameters was followed.

The system block diagram was constructed and it turned to be a third order system with two nonlinearities, dead zone and saturation.

A digital model was then developed to estimate this system in both linear and non-linear cases, where the modified Euler method was used as the numerical integration routine within the system model.

An analytical solution for the control system in its linear form was also performed and the accuracy of the digital model was checked against the exact solution of the linear system transfer function.

The digital model was used to adjust the value of one of the system parameters, which was not given in the manufacturer's data, in order to achieve some performance specifications.

The system model was also used to study the effects of small parameters variations on the performance of the turbine control system.