Grid-connected detection system and method of power distribution network

The invention discloses a grid-connected detection system and method of a power distribution network. The grid-connected detection system of the power distribution network comprises a grid-connected request information acquisition module, a control module, an electric energy quality detection module and an early warning processing module, the grid-connected request information acquisition module is used for acquiring grid-connected request information of the distributed power supply system; the control module is used for reading electric energy configuration parameters of the distributed power supply system according to the acquired grid-connected request information; the electric energy quality detection module is used for detecting whether the electric energy quality of the distributed power supply system is abnormal or not based on a numerical relationship between an electric energy configuration parameter of the distributed power supply system and a preset parameter threshold value; and the early warning