Interval method for the reliability evaluation of load point with consideration of the available capacity of distribution network feeders

An interval reliability analysis based on combination of the minimal path method for load point reliability evaluation is presented, aiming at figuring out the uncertainty and ambiguity of reliability parameters and load changing. According to the complexity of distribution network, this new algorithm sort the elements, as the result, which can rapidly obtain the reliability indices of individual load point as well as the reliability indices of the whole system. Meanwhile the concept of available capability is introduced and considered its constraints when calculating the indices of the load point. The effectiveness and utility of this approach is proved by example.