Power distribution network transformer planning method considering uncertainty of photovoltaic power generation output and total life cycle cost

The invention provides a power distribution network transformer planning method considering uncertainty of photovoltaic power generation output and a total life cycle cost, and belongs to the field of power distribution network planning. The power distribution network transformer planning method comprises the following steps: firstly providing a power distribution network transformer risk constant volume method based on the opportunity constraint theory by considering the output uncertainty of distributed photovoltaic power generation; calculating a distribution network probability trend after the access of the distributed photovoltaic power generation by using a three-point estimation method on this basis, meanwhile constructing a target function based on the total life cycle cost, and finally providing an uncertain power distribution network transformer planning model based on the total life cycle theory. An example simulation result indicates that, compared with the traditional deterministic power distribu