Low-voltage anti-island device of distributed photovoltaic power generation systems

The invention discloses a low-voltage anti-island device of distributed photovoltaic power generation systems. Resistance disturbance load is input, grid-connected inverter undervoltage protection actions are triggered, non-planed island operation of distributed photovoltaic power generation systems is damaged, and safety of system equipment and relative personnel is protected. The low-voltage anti-island device is suitable for various capacity levels of distributed photovoltaic power generation systems, and has two design types, namely a wall-mounted type and a floor type. A connected position is a distribution transformation low-voltage bus, a 380-volt power distribution branch box and a 220-volt/ 380-volt user power distribution box.