| Popis: |
The repetitive control is based on theory of internal model. Under the precondition of periodic disturbance signal, the repetitive controller produces correction signal basing on the control error of last cycle to superpose on control signal to eliminate the repetitive wave distortion in the latter cycle. ASI can be equivalent to second order low-pass filter based on the characteristic of its input and output, and repetitive control is applied in its closed loop control system. The compensator of the ASI is analyzed, and its stability and convergence are proven. The design of control parameters in frequency domain is also presented here. Finally, the simulation courses with the parameters that are obtained from a SPWM ASI (6 KVA/50 Hz/220 V). Simulation results show that the design method is feasible and the concept to use the repetitive control approach to improve the wave distortion of ASI with non-linear loads or disturbed by periodic signal is verified practically. |
