Reactive compensation configuration comprehensive evaluation method for reducing multi-loop direct current commutation failure risks

Abstract

The invention relates to a reactive compensation configuration comprehensive evaluation method for reducing multi-circuit direct current commutation failure risks. The method comprises the following steps of: firstly, searching a voltage weak region of a multi-direct current feed-in region under a typical fault, and determining an optimal reactive compensation station according to a relative transient voltage drop area index (RTVDAI); performing separate capacity determination (sequentially performing reactive compensation on each candidate point and determining the compensation capacity when a fault occurs) and simultaneous capacity determination (simultaneously performing reactive compensation on all the candidate points and determining the compensation capacity when the fault occurs) through each compensation station so as to reduce a commutation failure risk effect index and economical efficiency, processing the two indexes by using minimum-maximum standardization to obtain a closeness degree comprehensive analysis index, and performing fitting serialization on the closeness degree comprehensive analysis index by using an interpolation function to determine the optimal installation capacity; and finally, evaluating the advantages and disadvantages of the two schemes by using a mixed multi-attribute decision-making method based on a VIKOR method, and determining an optimal capacity configuration scheme.

Description

technical field [0001] The invention belongs to the technical field of power grid reactive power optimization configuration, and in particular relates to a comprehensive evaluation method for reactive power compensation configuration that reduces the risk of multi-circuit DC commutation failure. Background technique [0002] With the increasing number of DC transmission lines put into operation in my country's Southern Power Grid and East China Power Grid, multiple DC feeds into the AC grid form a complex multi-infeed AC-DC hybrid system. The failure of the AC system often causes the DC system commutation bus voltage to drop. This leads to the commutation failure of the DC system. If commutation failures occur simultaneously on multiple DC circuits, a large power impact will be generated on the receiving end system, which seriously threatens the safe and stable operation of the multi-infeed DC system. [0003] Improving the reactive power and voltage support capability of th...

AI Technical Summary

Problems solved by technology

Most studies rely on electrical distance to quickly determine weak areas, but the accuracy is not high. Therefore, relevant studies are based on simulation analysis to find weak areas, but the selection of fault sets is not typical enough.

In the research on determining the best installation site of reactive power compensation device, the existing research is based on the evaluation index of reactive power compensation installation effect of voltage sensitivity to determine the installation site, which fails to reflect the impact on other nodes of the system

[0005] There are relatively few studies on the optimal configuration of reactive power compensation device capacity. The existing research uses the cyclic point layout method to determine the installed capacity, which fails to optimize the installed capacity in detail. The existing research is to reduce the risk of commutation failure in determining the reactive power compensation capacity In the effect index, the DC power is used to measure the supporting ability of the receiving end grid to the DC system, and the interactive influence between the AC and DC hybrid systems is not considered.

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