Power distribution network stability and investment scheme determination method based on unit division

The invention provides a power distribution network stability and investment scheme determination method based on unit division, and relates to the technical field of power distribution networks. According to the method, a power distribution network region is divided into n cell regions, and the area of each cell region is calculated; calculating a power density influence factor of each cell region according to the injected active power and reactive power in each cell region, the phase difference between the voltage module value and the voltage, a power distribution network synchronization coefficient, an active power control coefficient and a reactive power control coefficient; and determining the stability of the power distribution network system in the cell region of the power distribution network and an investment scheme required by each cell region according to the power density influence factor of each cell region. According to the method, the stability of a power distribution network system in each cel