Three-phase four-wire shunt active power filter working simultaneously as energy conditioner

What is it about?

In order to calculate reference signal for active filter action it is enough to measure active filter’s DC side capacitors’ voltages. The supply source neutral conductor current can be zeroed even for nonlinear and unbalanced load generating DC-component in its neutral conductor. In addition, the active filter can buffer load active power changes and act simultaneously as a local energy accumulator.

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Why is it important?

This paper provides an alternative approach to address the problem of the three-phase four-wire shunt active power filter control methods. The considered control technique is based on the new universal method: the so called load equivalent conductance signal control technique. In general this technique can be applied for AC single phase systems as well as polyphase systems and even for circuits supplied from DC voltage sources.