Research On Control Design And Simulation Verification Technology Of Light Gas Turbine

The aviation reform gas turbine has the advantages of fast starting,compact structure,convenient use and maintenance and low pollution.The control system is the "brain" of the aviation reform gas turbine and the key functional system to ensure its safe operation.PID controller is the most widely used in engineering.It has the advantages of simple structure,strong robustness and easy to grasp.It has been widely used in the control of industrial equipment.However,when there is hysteresis in the monitoring signal,the iterative calculation of PID algorithm will deviate,causing the control system to send wrong instructions to the controlled object,resulting in poor robustness and slow speed regulation of gas turbine.Therefore,it is necessary to study the impact of monitoring signal hysteresis on PID control algorithm and control system.At present,the research on monitoring signal hysteresis mainly focuses on fault-tolerant control and fault diagnosis system.Fault-tolerant control is divided into data-based fault-tolerant control and model-based fault-tolerant control.In terms of the current application of fault-tolerant control,it is difficult to realize data-based fault-tolerant control in engineering application,while the fault-tolerant performance of the existing model-based fault-tolerant control will decline when the object does not match the observer model,It can not adapt to the characteristics of variable load of gas turbine.Considering a kind of aero reformed gas turbine for power generation,whose control system is PID control system,but with higher control requirements,there are two problems to be solved: first,determine the specific range of the maximum monitoring signal hysteresis time that the PID control system can tolerate;Secondly,the range of PID control parameters with high adaptability to the hysteresis of monitoring signal is determined;At present,there are relatively few studies on the problems above.In this paper,an aviation modified gas turbine for power generation is investigated.Aiming at the problem of monitoring signal hysteresis,the monitoring signal hysteresis model is established,and the control performance of this type of aviation modified gas turbine is optimized.The research results above can provide an important reference for this type of Aviation modified gas turbine to reduce the impact of monitoring signal hysteresis.The main research contents and conclusions are as follows:(1)In order to find the maximum monitoring signal hysteresis time range,the monitoring signal hysteresis model is established,which is combined with PID control system and gas turbine model to form a digital simulation model,which realizes the recurrence of monitoring signal hysteresis,and analyzes the performance of gas turbine system caused by pressure signal hysteresis,temperature signal hysteresis and speed signal hysteresis.The analysis results show that the pressure signal hysteresis and speed signal hysteresis have a great impact on the control performance of gas turbine,and the temperature signal basically has no impact on the control performance of gas turbine.Based on the research on the impact of pressure signal hysteresis and speed signal hysteresis on gas turbine speed control,the maximum allowable hysteresis time range of gas turbine speed control is determined.(2)Based on the influence law of speed signal hysteresis on gas turbine control performance,the performance of gas turbine control system with speed signal hysteresis is analyzed with the proportional gain coefficient of maximum fuel regulation output and the proportional gain coefficient of gas generator speed regulation output as variables.The analysis results show that increasing the proportional gain coefficient of the speed regulation output of the gas generator and the proportional gain coefficient of the maximum fuel regulation output can effectively improve the speed control performance of the gas turbine,but the improvement effect decreases with the increase of the hysteresis time.(3)Based on the influence law of pressure signal hysteresis on gas turbine control performance,the performance of gas turbine control system with monitoring signal hysteresis is analyzed with the proportional gain coefficient of maximum fuel regulation output and the proportional gain coefficient of gas generator speed regulation output as variables.The results show that increasing the proportional gain coefficient of the speed regulation output of the gas generator can effectively improve the speed control performance of the gas turbine;The proportional gain coefficient of the maximum fuel regulation output has an optimal parameter range,which can improve the performance of the control system when the speed is hysteretic.