Research On Control Stragegy Of Pneumatic Power System Based On Volume Decompression

Pneumatic system has a number of advantages of pollution-free and reliable work, largeadaptability and good economic performance and so on. The compressed air as thepowered source of the pneumatic system can store energy, which can be the secondaryenergy. This paper based on the theory: providing electricity supply for thecommunications vehicles. By converting energy storage in the high-pressure gas intomechanical energy, the system drives the generator to operate. In this process, thehigh-pressure gas is converted into low-pressure gas, and the pressure energy is convertedinto the kinetic energy first and then into electrical energy. After the transformation of theenergy, the system can provide steady electrical energy for the mobile communicationdevice. This paper mainly did the following work:First, the paper analyzed the methods of the pneumatic pressure reduction——thepressure reduction principle with expander and the pressure reduction with throttleregulator, and compared them from the perspective of energy. Then, the composition andprinciple of the pressure reduction principle with expander is researched, and the systemmodel is established. Then it analyzed the factors of the volume of the container、thepressure、the pressure of the load and the time of sample which effect the dynamicperformance of the system. To solve the problem of instable output of the on-off valve, itimproved the control system by the predictive PID control method and then simulated. Itestablished the system of classification pressure reduction in order to further ensure thestability of the system, and then simulated. Finally, against of the conversion frommechanical energy to electrical energy, it analyzed the structure and principles of thecontrol system. It puts forward the fuzzy PID control strategy in order to ensure a steadyspeed of the motor and designed the PID controller. Finally, it established the simulationmodel using MATLAB and the simulation was carried out on the dynamic performance ofthe system under different load and different input signal.