DG and islanding detection device, the converter

The present application discloses a distributed power generation system and islanding detection device, the distributed power generation system comprising a grid converter, an input power source for the grid converter connected to the output of the grid side converter between the grid and network switches, located at the grid converter and a common connection point between the CAPE off, and the load connected at a common connection point, a plurality of capacitors of the capacitor module, a switching module and islanding detecting means; said switching module is connected to one end of the capacitor module, and the other end connected to the common connection point; when the switching module is closed, the capacitor module is connected to the common connecting point; the administration when the module is cut off, and the capacitor module disconnecting said common connection point; islanding detection means for obtaining the impedance value at the common connection point and the impedance is compared with a threshold value, when the impedance value is greater than the impedance threshold for exceeds the predetermined duration, it is determined islanding occurs.