Probability harmonic load flow calculation method based on improved three-point estimation and maximum entropy theory

The invention discloses a probability harmonic power flow calculation method based on improved three-point estimation and a maximum entropy theory. The method comprises the following steps: 1, constructing probability models of fan output power, photovoltaic output power and load output power; 2, adding a group of estimation points on the basis of the point estimation method to form a new estimation point matrix and weight; 3, on the basis of the probability model constructed in the step 1, carrying out deterministic calculation on the harmonic power flow, and solving harmonic voltage of each node; and 4, establishing a constraint condition about the harmonic voltage, and constructing an optimal probability distribution approach of the harmonic voltage through a maximum entropy theory. According to the method disclosed by the invention, the harmonic distribution condition of the power distribution network is obtained by considering the characteristics of the uncertainty of the fan and the photovoltaic and the