Voltage temporary-drop failure probability evaluation method of sensitive equipment

Abstract

The invention discloses a voltage temporary-drop failure probability evaluation method of sensitive equipment. The method includes the following main steps: S1, obtaining temporary-drop data; S2, establishing a T-U coordinate system, and dividing an equipment voltage tolerance curve coordinate system into multiple regions according to a voltage tolerance curve of the sensitive equipment; S3, according to the temporary-drop data, judging whether a voltage temporary-drop is a three-phase balanced rectangular voltage temporary-drop, executing a step S4 if the voltage temporary-drop is the three-phase balanced rectangular voltage temporary-drop, and otherwise, normalizing the temporary drop to obtain a voltage temporary-drop amplitude and voltage temporary-drop duration after processing; S4, judging a position relationship of the temporary drop and the voltage tolerance curve of the sensitive equipment according to the voltage temporary-drop amplitude and the voltage temporary-drop duration; and S5, according to the position relationship of the temporary drop and the voltage tolerance curve of the sensitive equipment, judging probability of causing equipment failure by the voltage temporary-drop. The evaluation method provided by the invention overcomes the shortcomings of existing methods, and can determine voltage temporary-drop tolerance capability of the sensitive equipment.

Description

technical field [0001] The invention relates to the technical field of power supply, and more specifically, to a method for evaluating the probability of voltage sag failure of sensitive equipment. Background technique [0002] In existing methods, for unbalanced sags, non-rectangular sags, or non-rectangular unbalanced sags, when evaluating the failure probability of sensitive equipment caused by sags, the existing methods usually regard them as rectangular three-phase balanced sags for evaluation , from the energy point of view, this approach will inevitably lead to large errors, and there is a problem of inaccurate evaluation. [0003] In addition, when evaluating the failure probability of sensitive equipment caused by voltage sag, the focus is generally on the evaluation of the uncertainty of the voltage sag tolerance of sensitive equipment, and it is determined by using different mathematical methods such as probability, randomness, and fuzzy randomness. Uncertainty c...

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Problems solved by technology

[0002] In existing methods, for unbalanced sags, non-rectangular sags, or non-rectangular unbalanced sags, when evaluating the failure probability of sensitive equipment caused by sags, the existing methods usually regard them as rectangular three-phase balanced sags for evaluation , from the energy point of view, this approach will inevitably cause a large error, and there is a problem of inaccurate evaluation

[0003] In addition, when evaluating the failure probability of sensitive equipment caused by voltage sag, the focus is generally on the evaluation of the uncertainty of the voltage sag tolerance capability of sensitive equipment, and it is determined by using different mathematical methods such as probability, randomness, and fuzzy randomness. Uncertainty can be evaluated, but the above evaluation methods can all start from a mathematical point of view, and the extent to which they can characterize the uncertainty of the voltage sag withstand capability of sensitive equipment is unknown

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