A transient voltage quantitative evaluation method for a power distribution network containing high-permeability wind power

Abstract

The invention relates to a transient voltage quantitative evaluation method for a power distribution network containing high-permeability wind power, which comprises the following steps: firstly, constructing a voltage sag safety margin index suitable for being applied under a voltage sag condition based on a binary table criterion; and secondly, further constructing a voltage sag safety margin index, and effectively combining a sag index and a sag index by introducing a step factor to obtain a transient voltage safety margin index based on the improved multi-binary table. Besides, the influence of intermittency and uncontrollability of wind power output on the evaluation result is considered, so that the index is correspondingly corrected, and the applicability of the index in a changeable environment scene is improved. The method also includes: thirdly, defining a regional transient voltage qualified rate index, a regional transient voltage safety margin index and a regional transient voltage instability risk index to measure the transient voltage stability of a certain region; and finally, performing time domain simulation analysis on the power distribution network system of the IEEE15 node by using the proposed index, and verifying the effectiveness and universality of the index while quantifying each factor influencing the transient voltage stability of the power grid.

Description

technical field [0001] The invention relates to the field of transient voltage stability of a distribution network, in particular to a quantitative evaluation method for a transient voltage of a distribution network containing high-permeability wind power. Background technique [0002] In recent years, the penetration rate of wind power in the distribution network has gradually increased, which poses new challenges to the transient voltage stability of the power grid. Therefore, it is particularly important to establish a set of scientific and reasonable evaluation theories to quantitatively analyze the various factors affecting the transient voltage stability of distribution networks with high-penetration wind power. [0003] At present, some literatures have proposed indicators for evaluating the transient voltage stability of distribution networks, which can be summarized into the following three categories: [0004] 1): Use the two indicators of transient response recov...

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Problems solved by technology

[0010] Most of the above evaluation indicators for the transmission network are limited to the specific network background, and can only evaluate the bus voltage under a single transient characteristic, and it is powerless for the bus voltage with multiple transient characteristics after the disturbance

In addition, for arbitrary fault forms and specific disturbance types, existing evaluation indicators generally have the problem of being unable to take into account, which makes their application scenarios severely limited

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