Construction of a Simulator for the Siemens Gas Turbine SGT-600

Abstract: This thesis covers the development of a simulator for the Siemens Gas Tur-bine SGT-600. An explanation on how a gas turbine works is also given, as well as the principles behind the control system used by Siemens to control the turbine. For Siemens Industrial Turbomachinery to be able to test its control sys-tem before delivering a gas turbine to the customer, a simulator is needed. The control system needs to be adjusted for every unique gas turbine, since there are several options for the customer to choose between when ordering the turbine. A control system standard is under development, which also needs to be tested in a simulator. The framework for the simulator, i.e. the hardware and software that form the simulator system, was predefined to suit this specific purpose. The Siemens software SIMIT is used for developing the model. SIMIT is a real time simulation tool where models are constructed using blocks, similar to MATLAB Simulink. A gas turbine is basically a heat engine that produces mechanical energy or electricity. The main task of the control system is to control the fuel flow to the combustion chamber and by that keeping the machine at desired speed. The gas turbine model was developed using measurement data from a site in Hungary, where a gas turbine of the type SGT-600 is in service. The model is based on simplified relations between the signals. By analyzing measurement data and learning about the functionality of a gas turbine it was found out that the speed of the gas generator affected most other sig-nals, like temperatures and pressures. The gas generator speed was found to be dependent on the heat flow, which is determined by the openings of the gas control valves. As a result of this thesis a working simulator for the gas turbine SGT-600 has been developed. The simulator can be used for testing the control sys-tem standard and for testing the control system when adapting it to a spe-cific delivery. It is also suitable for educational purposes, for example to instruct customers.