Abstract:
This work proposes the application of finite control set model predictive control(FCSMPC)
for dynamic reactive power and harmonics compensation. To achieve these objectives
the FCS-MPC is applied to a hybrid active power filter consisting of a capacitor
bank, an LCL filter and a multilevel converter.
The reactive power control is accomplished through control of the capacitor bank voltage,
in this way it is possible to deliver reactive power greater or smaller than the nominal
power of the capacitor bank. The source current harmonics compensation is based on two
principles: harmonic blocking, which prevents grid voltage harmonics from generating
harmonic currents in the source; and filter tuning, which turn the hybrid filter branch
into a short circuit for the load harmonic currents, avoiding them to penetrate the grid.
A multivariable control is applied in order to reduce the problems with the LCL filter
resonances. The control references for the fundamental frequency are obtained from the
system model, and a proportional resonant control is applied to calculate the references
for the harmonic frequencies.
Simulations and experimental results are presented in order to verify the behaviour of the
applied techniques.