Research On Controller Of Free Piston Stirling Generating System

Among the space power, Free piston Stirling engine(FPSE) is more and morepopular because of its wide fule source, quiet, environment friendly and Highefficiency. The FPSE generating system is composed by the FPSE and thepermanent magnet linear oscillation motor. The system eliminates crank linkage andit has the characteristics of high efficiency, good running characteristics and simplestructure. In this dissertation, we study the following aspects of FPSE controlsystem.First, the working principle of FPSE power systems is studied. By deducing thedynamics equation of FPSE and mathematical model of magnet linear oscillatingmotor, we get the mathematical model of the whole system. Applying theMatlab/Simulink, we build the power system simulation model, which provide atheoretical basis for the study of control systems.Secondly, we study the control strategy in different working condition. Instarting and power generation stages, both stroke control strategy and currentcontrol strategy are used. The principle of position detection based on EMF iselaborated and improved. Simulation results verify the feasibility of the controlstrategy and position estimation algorithm.Thirdly, the hardware and software of the FPSE power systems are designed.The main controller uses the DSP TMS320F2812designed by Texas Instruments (TI)corporation. Position detection uses the sensorless technology which depends theelectromagnetic relation to estimate the mover position. This method has highreliability, low cost and easy maintenance.Finally, we build the experimental platform to test the system. Usingthree-phase linear motor to substitute FPSE, we test starting and power generationstages control strategy. Experimental data indicates that the control system build inthis thesis meets the requirements well.