Guest Lecture on 25th of April: Internal Model Principle in classical control

A key topic in classical control theory is the Internal Model Principle (IMP), which states that if a certain signal is wanted to be tracked or rejected without steady state error, it is necessary to include its generator inside the control loop. Although the IMP is generic, it has special interest for signals that could be termed as marginally stables, i.e., with generators such that their Laplace transforms exhibit simple poles on the imaginary axis.

The case of signals with simple poles on the origin, i.e., steps, can be easily studied through the system type concept. Instead, this talk focuses on the tracking/rejection of signals with purely imaginary simple poles, i.e., periodic signals. This problem can be addressed with resonant control and repetitive control, which are well-known techniques that rely on the IMP.

There exist many power electronics applications dealing with periodical signals, i.e. most converters connected to an ac network need to track/reject periodical signals. In the talk some applications will be analyzed.

Dr Ramon Costa Castelló from UPC of Barcelona gives a lecture of Control Engineering on Thursday, 25th of April, from 14.05 to 16.00 o'clock, in Room K1702