Microgrid control period stability analysis method and system

The invention belongs to the field of microgrid operation control, and discloses a microgrid control period stability analysis method and system. The method comprises the steps: building a small signal model of a microgrid distributed closed-loop control system, corresponding to different control periods, of each distributed power supply, and obtaining a discrete characteristic equation based on Euler discretization; carrying out critical characteristic root trajectory tracking on a system characteristic equation according to the least common multiple of multiple control periods, and searchingfor possible characteristic roots on a unit circle to calculate the control period enabling the microgrid to be stable. According to the invention, the relation between the control periods of different distributed power sources is studied, a basis is provided for distributed control period selection, average voltage recovery and active power equalization are realized, and the stability and the dynamic performance of the