SVG works by detecting the reactive current from the load and injecting a compensating current in real time, making the load appear as if it were resistive to the grid. This improves power system efficiency and power quality.

The active harmonic filter operates on a 3-level neutral point clamped (NPC) topology. As shown in the figure below, the traditional 2- level topology circuit structure consists of 6 IGBTs (2 IGBT power devices on each phase pin and current path), and in the 3-level

topology, there are 12 IGBTs (in each phase 4 IGBT power devices on pins and current paths). The 3-level topology circuit can generate three voltage levels at the output, including DC bus positive voltage, zero voltage and DC bus negative voltage. Two-level topology circuits can only output positive and negative voltages. At the same time, the three-level topology circuit also ensures higher quality and better harmonic output voltage, thereby reducing output filter requirements and associated costs.

The active harmonic filter operates on a 3-level neutral point clamped (NPC) topology. As shown in the figure below, the traditional 2- level topology circuit structure consists of 6 IGBTs (2 IGBT power devices on each phase pin and current path), and in the 3-level topology, there are 12 IGBTs (in each phase 4 IGBT power devices on pins and current paths). The 3-level topology circuit can generate three voltage levels at the output, including DC bus positive voltage, zero voltage and DC bus negative voltage. Two-level topology circuits can only output positive and negative voltages. At the same time, the three-level topology circuit also ensures higher quality and better harmonic output voltage, thereby reducing output filter requirements and associated costs.

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