Abstract:
Most of the systems in our daily life consist of
power electronic circuits. They are micro circuits which
are difficult to be analyze because the circuit consists of
nonlinear elements. This paper deals with one of the
power electronic circuit, boost converter. The non-linear
elements of the converter circuit are linearized. The
obtained linearized converter circuit is a higher order
model. Designing a controller for this higher order model
is complex and simulation time also increases. So, efficient
order reduction techniques have been used to reduce the
system order. The reduced order system is now used to
design a controller. H-infinity method is used to design a
PI and PID controller for load voltage control of the
converter circuit. Conventional PID and ZN PID
controllers were also been developed for comparison with
H-infinity based controllers. H-infinity techniques have the
advantage over classical control techniques in that, they
are readily applicable to problems involving multivariate
systems with cross-coupling between channels.
Performances of these controllers were compared in terms
of settling time. The models are simulated using MATLAB
13.0 simulink software. Simulation results show that
hankel was a better method for order reduction depicting
same characteristics for higher and lower order models.
H-infinity based PID controller show better results
compared to other controllers.
