| Inlet guide vane control system is an important part of marine gas turbine distributed control system.It is able to control the dynamic response of inlet guide vane to adjust the inlet flow rate and the velocity triangle at the inlet of compressor,so as to improve the operation efficiency and ensure safety.The environment of a marine gas turbine changes rapidly and it will be affected by disturbances,which puts forward requirements for the ability of adapting and disturbance resisting of the control system.On the other hand,inlet guide vane control system needs to close guide vane swiftly to prevent gas turbine from overspeed when unloading.At present,PID control is generally adopted by inlet guide vane systems in operation,while it can not meet the control requirements.In this thesis,the dynamic characteristics of the inlet guide vane system are studied and its physical model is established.Then,according to the control requirements,a control system is proposed based on adaptive inverse control strategy.Finally,the performance of the control system is tested,and its effectiveness is verified by simulations.This thesis has carried out the following aspects of work:1.The physical model of the inlet guide vane system is established based on modular modeling method with Simscape Fluids and Simscape Multibody tools.2.The control requirements of the inlet guide vane system are decoupled,and a control system is proposed based on adaptive inverse control strategy with the help of the physical model.Then,the control system is further optimized to meet the control requirements.3.According to the control requirements,the method specification of simulation is established.Then,the simulation program of the adaptive inverse control system is built after importing Simscape model into Lab VIEW.Finally,simulations are carried out to verify whether the control system meets the control requirements.Simulations show satisfactory results.The adaptive inverse control system has met the design requirement.Its effectiveness is thus validated. |
