Fuzzy PID Controller Design for PWM-Buck EBW Stabilized High-Voltage Source Using Saber-Matlab Co-simulation

A novel PWM-buck type EBW (electron beam welder) stabilized high-voltage source circuit system is introduced, in which an inductance current-limiting circuit is attached to prevent surge and over current thus increasing the system´s working reliability and stability. Due to its strong non-linearity and large signal working condition, it is difficult to reach a relatively satisfactory performance with a conventional PID controller. Therefore, a fuzzy PID controller is developed to handle these issues. Consider that Saber is more specialized and powerful in switched-circuit analysis whereas Matlab is more powerful in control system design, a Saber-Matlab co-simulation method is effectively used to design the fuzzy PID controller by elaborately establishing the Saber and Matlab models and fuzzy algorithm. The simulation results indicate that this fuzzy PID controller has a higher control precision, better dynamic and static behaviors, favorable self-adaptive capability as well as easier realization. It is therefore quite adequate in practical applications.