Research on transformer tap switch applied in low voltage ride-through testing device for PV inverters

This article provides a specially designed low voltage ride-through (LVRT) detection device, which uses the transformer tap switch to not only switch the taps of the reactors but also change the structure of the main circuit structure. The cost of this set of design solutions is only 10% of traditional testing device. This set of design can reduce the using number of reactors, increase testing device reliability, and improve the detection efficiency.