Power distribution network electric energy quality evaluation method and system considering wind and light load uncertainty

The invention belongs to the technical field of electric energy quality assessment, and provides a power distribution network electric energy quality assessment method and system considering wind and light load uncertainty, and the method comprises the steps: firstly constructing a wind and light load probability distribution model, and converting the wind and light load non-normal distribution probability model into standard normal distribution; a wind-light load three-dimensional normal distribution joint probability distribution model is constructed; the method comprises the following steps: sampling a wind-light-load joint probability density distribution function, carrying out probabilistic load flow calculation, carrying out electric energy quality comprehensive evaluation according to a probabilistic load flow result, and finally, adopting a probability density function description method capable of flexibly selecting a starting function to break through the limitation that an existing series method ca