The active filter is basically an a.c./d.c. bidirectional
inverter with IGBTs capable to inject into the grid any
programmable current value of any wave shape.
The active filter is used to eliminate the current harmonics
that circulate in a three phase grid and are produced by lineal
loads connected to that grid. This equipment avoids non
desirable phenomena that distortions the voltage wave shape,
affecting the installation where they are produced as well as
other installations.
In order to reduce the harmonic distortion, the filter includes
a microcontroller that analyses the current wave shape
continuously and calculates the current component it has to
inject independently in each one of the three phases, with
response times of 20 ms.
The active filter is connected at the connection point where it
is necessary to eliminate the current harmonic distortion.
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