Vineet Kumar, B. C. Nakra and A. P. Mittal. Some Investigations on Fuzzy P + Fuzzy I + Fuzzy D Controller for Non-stationary Process. International Journal of Automation and Computing, vol. 9, no. 5, pp. 449-457, 2012. DOI: 10.1007/s11633-012-0666-9
Citation: Vineet Kumar, B. C. Nakra and A. P. Mittal. Some Investigations on Fuzzy P + Fuzzy I + Fuzzy D Controller for Non-stationary Process. International Journal of Automation and Computing, vol. 9, no. 5, pp. 449-457, 2012. DOI: 10.1007/s11633-012-0666-9

Some Investigations on Fuzzy P + Fuzzy I + Fuzzy D Controller for Non-stationary Process

  • The paper addresses the adaptive behaviour of parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative (FP+FI+FD) controller. The parallel FP+FI+FD controller is actually a non-linear adaptive controller whose gain changes continuously with output of the process under control. Two non-stationary processes, whose characteristics change with time, are considered for simulation study. Simulation is performed using software LabVIEWTM. The set-point tracking response of parallel FP+FI+FD is compared with conventional parallel proportional plus integral plus derivative (PID) controller, tuned with the Ziegler-Nichols (Z-N) tuning technique. Simulation results show that conventional PID controller fails to track the set-point and becomes unstable as the process changes its characteristic with time. But the parallel FP+FI+FD controller shows considerably much better set-point tracking response and does not deviate from steady state. Also, a huge spike is observed in the output of PID controller as the reference set-point and process parameters are changed, while the FP+FI+FD controller gives spike free control signal.
  • loading

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return