Optimal island dividing calculation method of distributed power distribution network

Abstract

The invention discloses an optimal island dividing calculation method of a distributed power distribution network. According to the method, at the step three, evaluation function calculation and optimal island searching are carried out, so that the space complexity is reduced; on the basis of combination of an inclusion-exclusion principle, state simplification is carried out on a combination optimization problem, so that the problem is completed in polynomial time; and solution is completed in time and polynomial space, so that the computing speed is increased. The method has the following advantages: an improved dynamic programming algorithm is put forward to carry out island division solution; a reasonable plan islanding scheme can be calculated quickly and accurately; the maximum powersupply recovery is taken as an objective and the importance of load is considered comprehensively; the problem solving speed and precision are improved effectively; and an important scientific basisis provided for dynamic planning of a distribution network.

Description

technical field [0001] The invention relates to the field of power grid operation and planning, in particular to a planning calculation method for island division of a distribution network with distributed power sources. Background technique [0002] With the gradual maturity of distributed generation (Distributed Generation, DG) technology, the DG that uses various renewable energy as primary energy in the distribution network is increasing year by year. With the continuous improvement of DG penetration rate, the operation mode and management of distribution network are also more complicated. The current DG grid-connected regulations do not allow island operation, and require that DG must withdraw quickly when a fault or disturbance occurs, resulting in the limitation of DG's contribution to the distribution network. in clean power generation. However, the advantages of DG in terms of power generation flexibility have not been fully utilized. The island division scheme and...

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Problems solved by technology

With the continuous improvement of DG penetration rate, the operation mode and management of distribution network are also more complicated. The current DG grid-connected regulations do not allow island operation, and require that DG must withdraw quickly when a fault or disturbance occurs, resulting in the limitation of DG's contribution to the distribution network. in clean power generation

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