Distributed power supply joint credible capacity evaluation method

The invention discloses a distributed power supply joint credible capacity evaluation method, which comprises the following steps of: sampling a time sequence state of a power distribution network system element in an evaluation period T, and generating a time sequence operation state model of the power distribution network system element; establishing a power distribution network island model; the time sequence residual electric quantity of the energy storage equipment; establishing a maximum island model; solving the maximum island model through a heuristic look-ahead greedy algorithm to obtain a first island income result; step 5, establishing an island checking model; according to the variance coefficient, whether the time sequence residual electric quantity of the energy storage equipment, the first island income result and the second island income result converge or not is judged, and credible capacity searching is carried out on the power distribution network island model according to a bisection metho