Quantitative identification method for transfer power supply weak ring influencing power distribution network fault recovery

Abstract

The invention discloses a quantitative identification method for a transfer power supply weak ring influencing power distribution network fault recovery, which comprises the following steps: S1, modeling a main distribution network, and selecting a starting point; s2, calculating a bus security load; s3, calculating the total recovery load of the feeder line of the single transfer path; s4, calculating a multi-wheeling path recovery total load; s5, calculating the primary recovery rate of the load of the transformer substation; s6, judging whether calculation of all the substations is completed or not, and if calculation of all the substations is not completed, repeating the steps S1 to S5; s7, sorting the substations according to the primary load recovery rate; S7, sorting the substationsaccording to the primary load recovery rate; and S8, according to the threshold value, carrying out positioning and strategy improvement on the weak link. The invention provides a quantitative identification method for a transfer power supply weak ring influencing power distribution network fault recovery, which can perform quantitative calculation on the power grid transfer power supply weak ring and provide a basis for power distribution network planning, regulation and control and power grid transformation.

Description

technical field [0001] The invention relates to the technical field of power grid fault analysis, in particular to a method for quantitatively identifying weak links in transfer power supply that affect power distribution network fault recovery. Background technique [0002] At present, in order to improve the reliability of power supply, the design of my country's distribution network generally adopts the idea of ​​closed-loop design and open-loop operation. The capacity-load ratio of distribution network is generally high (higher than 2.0), but the reliability level is not high. The distribution network achieves higher reliability at a lower capacity-to-load ratio (less than 1.6), the main reason being that the power transfer capacity of the distribution network has not been fully utilized. [0003] The load recovery in the case of power grid failure is restricted by the weak link of power transfer. Eliminating the weak link of power transfer is an important means to improv...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that quantitative calculations cannot be performed on the weak links of power grid transfer to power supply, and to provide a method that can perform quantitative calculations on the weak links of power grid transfer to power supply, and provide a basis for distribution network planning, regulation, and power grid transformation Quantitative identification method for weak links in transfer power supply that affect distribution network fault recovery

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