Research On Robust Controller Of Gas Turbine Generator Set

Ship power system is one of the complicated power system.When a ship is sailing on the sea,the outside environment is relatively bad,which may affect the stability of the ship.With the development of science and technology,the demand of the system stability and rapid recovery after the breakdown is higher and higher,so the speed control and voltage control of power system have become the focus of the research direction.The gas turbine is a ideal choice as a prime mover because of high power density,small pollution and fast start-up speed.In order to improve the stability and dynamic performance of the ship power system,this paper takes the gas turbine as the prime mover for the overall modeling of the ship power system,uses MATLAB robust control toolbox to obtain the H_?controller,simulates the dynamic change of the load on board,observes the simulation waveform and studies the dynamic performance after the load is changed.Firstly,this paper refers to Rowen model of single-axis gas turbine,establishes the control model of gas turbine and simplifies the model,ignoring temperature control and acceleration control.Design the H_?speed controller,stuudies on speed regulation characteristics of gas turbine when the load is sudden changed and be compared with the PID controller.Secondly,Using Parker equation to simplify the model of synchronous generator,and the mathematical model is established according to the actual engineering situation.Using brushless excitation method,the overall model of synchronous generator voltage regulation system is established.The weighting function is selected and the H_?voltage controller is obtained by compiling M file in MATLAB.The dynamic response curves of terminal voltage and excitation voltage are observed by adjusting the load,and be compared with the PID control method.Then an H_?integrated controller is designed.The H_?speed controller is designed on the assumption that the voltage is constant.The H_?voltage controller is designed on the assumption that the speed is constant.Under the actual operating conditions,the speed and voltage affect each other.Therefore,the gas turbine speed control system and synchronous generator excitation system are integrated as a whole,and the load changes are adjusted to observe the simulation curves of speed,voltage and other indicators.Finally,the H_?integrated controller is used to build the system model of parallel connection of gas turbine generator sets.The parameters of two generating sets are identical.One of them drives 100%static load,when the system is stabilized,another generating set is merged into power system.Using MATLAB to simulate and observe the dynamic characteristics.From the simulation diagram,it can be seen that in the process of changing the load,the H_?controller can quickly adjust the speed,voltage and other indicators under the premise of ensuring the stability of the system,and meet the control requirements of various performance indicators.