Research On Simulation Technique For Small Turbine Fuel Servo System

With the further exploitation and utilization of natural gas, gas turbine (GT) will occupy increasingly position in electric-power production field. Dual-fuel servo system owns wide potential application. Its dynamical characteristics have great influence on the overall dynamic characteristics of the GT. So the founding dynamical model for the dual-fuel servo system is a critical step in the overall GT generator set.A lot of factors which have influence on dynamical characteristics of the GT dual-fuel servo system were taken into consideration in this thesis, including the change in rotation rate and load, the transfer and mix of dual fuels. A dual-fuel servo system dynamical model was found based on the mechanism modeling method. This thesis mainly includes the follows contributions:1. Analyze the thermodynamic cycle and the structure and operational principle of its main components, including compressor, combustor and turbine, found its thermodynamic cycle chart. Analyze the structure and control flow of dual-fuel servo system;2. Analyze dynamical characteristic of dual-fuel servo system, on the basis of mechanism modeling method, a dual-fuel servo dynamical model which fits all the work points including starting, transferring and mixing of dual fuels were found;3. On the basis of dynamical model of fuel servo system, a simulation model was found by use of Simulink software. A simulation system was developed based on VB, which adopt OLE protocol to realize the data exchange between VB and Simulink and OPC protocol to realize the data exchange between VB and LOGIX5 PLC emulator.4. The digital simulation experiments about mixing, transferring and starting have been done.