In recent years, with the global emphasis on renewable energy and the continuous advancement of technology, the new energy industry is developing at an unprecedented speed. As an important part of new energy, the stability and safety of distributed power generation systems such as wind power and solar power are directly related to the operating efficiency and reliability of the entire system. As the scale of grid connection continues to expand, higher requirements are also placed on the safe and stable operation of the power grid. These not only affect the stability of the power system, but also bring many confusions and challenges to new energy equipment manufacturers and users.