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On-line voltage safety quantitative evaluation method

A quantitative evaluation and safety technology, applied in the direction of electrical digital data processing, instruments, calculations, etc., can solve the problem of not considering the influence of voltage offset safety evaluation parameters, etc.

Inactive Publication Date: 2014-04-23
SHANDONG UNIV +3
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Problems solved by technology

[0009] The safety assessment method given above can only evaluate the voltage excursion independently from the cycle or degree of the voltage excursion, and does not consider the cumulative effect of the voltage excursion on the safety evaluation parameters.
like figure 1 As shown, using the above safety assessment method to calculate the parameters, the parameters of the two curves are the same, but it is obvious that curve 1 is more serious than curve 2

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  • On-line voltage safety quantitative evaluation method

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0051] Such as figure 1 As shown, the traditional method of calculating online voltage safety quantification is: according to the voltage curve actually lower than v cr duration of t b with t cr The difference between the two is used to reflect whether the security is violated and the severity of the violation, and the difference between the two is used to define the voltage offset safety margin index:

[0052] when v min =v cr , that is, when there is only one intersection point between the voltage curve and the safety limit line, η=1; and at this time, the safety margin can also be calculated according to (2), at this time t b =0, also get η=1.

[0053] Using the above safety assessment method to calculate the parameters, the parameters of the two curves are the same, but it is obvious that curve 1 is more serious than curve 2.

[0054] The present...

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Abstract

The invention discloses an on-line voltage safety quantitative evaluation method which comprises the following steps: providing a voltage safety binary table [vcr, tcr], respectively calculating an area Sd of a minimum surrounding area of a disturbed mutation wave curve or a wave curve which is disturbed and recovered to be stable, and v=vcr within tcr according to three different situations: obtaining the area Sdz of the minimum surrounding area of the final voltage curve and v=vcr within tcr according to multiple calculation results, and establishing an index eta for reflecting voltage offset accumulation of voltage offset parameters. On the basis of the index provided before, the accumulation effect of voltage offset is taken into account, and based on the integral of the voltage offset to time, a novel safety margin index is provided. Compared with the conventional evaluation method, the novel index is accurate and convenient to calculate and has good reference values.

Description

technical field [0001] The invention relates to the field of power system voltage security, in particular to a trajectory-based on-line voltage security quantitative evaluation method. Background technique [0002] The traditional voltage safety index is generally based on the power flow equation of the system, and the specific index value is obtained by performing multiple iterative calculations on the system. This method is not only limited by the calculation speed, but also cannot effectively realize real-time monitoring of the voltage level. . [0003] The acceptability of instantaneous voltage deviation can be determined by a given voltage drop threshold (v cr ) and the abnormal duration of the voltage deviated from this given value (t cr ) form a voltage safety binary table [v cr ,t cr ] to describe. According to the literature, it can be deduced that a quantitative evaluation method of power system voltage deviation security (TVDA) is found by finding the voltage...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 陈立征张恒旭孙华东张健吴萍
Owner SHANDONG UNIV
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