In this case, voltage source inverter operates as an active filter.
Different kinds of strategies to control shunt active filter have
been presented. Sinusoidal current strategy is a compensating
method that makes the active filter to compensate the nonlinear
loads so that the currents become sinusoidal and
balanced. To get sinusoidal and symmetrical compensated
currents, the active filter should compensate already all of
undesired harmonics. Active filters are generally made of tow
separated blocks as follows: