Conductance-controlled global-compensation-type shunt active power filter

What is it about?

This paper presents a load equivalent conductance based control method for a shunt active power filter. The principle of energy balance in the circuit, which means between supplying source – active filter – load, is used to obtain the control formula. The natural inertia of the active filter action is exploited, so no PI regulators are needed.

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Why is it important?

The active filter can compensate for non-active current and, additionally, can stabilise the supplying source active power. In a case of generating loads energy harvesting is possible. The presented method is useful as well for voltage-source as current-source inverter based active filters, and for DC system as well as for AC single- or three-phase one.