Online evaluation method for safety control amount of AC line fault based on speed-down DC sensitivity

An AC line and sensitivity technology, applied in the direction of AC network circuits, measuring electricity, measuring devices, etc., to achieve the effect of reducing the intensity of manual calculation, improving work efficiency and accurate calculation results

Active Publication Date: 2016-10-19
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an online evaluation method for the safety control quantity of AC line faults based on the sensitivity of the rapid drop DC, which can automatically and quickly calculate the N-2 fault of the first and second section lines of the DC converter

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  • Online evaluation method for safety control amount of AC line fault based on speed-down DC sensitivity
  • Online evaluation method for safety control amount of AC line fault based on speed-down DC sensitivity

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[0035] The present invention will be further described in detail below in conjunction with the drawings.

[0036] The present invention provides an on-line evaluation method of AC line fault safety control quantity based on rapid-declining DC sensitivity ( figure 1 ), including the following steps:

[0037] Step 1: Online monitoring of the AC line operating status of the first, second and third-level sections of the DC converter station to determine whether the offline data is calculated for the first time or the operating status of the AC line has changed. If so, update the offline data, otherwise keep the original offline data unchanged ;

[0038] Step 2: Online monitoring of the active power of the AC line, for each fault in the line N-2 fault set, combined with the power flow transfer ratio in the offline data to determine the critical AC line overload;

[0039] Step 3: For the AC line N-2 fault that causes the critical AC line to overload, calculate the corresponding fast-drop D...

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Abstract

The invention provides an online evaluation method for the safety control amount of an AC line fault based on the speed-down DC sensitivity. The method comprises the following steps that whether offline data is calculated for the first time or the operation state of an AC line is changed is determined, if YES, the offline data is updated, and otherwise, the offline data is not changed; the overload quantity of a key AC line is determined; and the speed-down DC safety control amount is calculated, and a limited AC line is determined. According to the method, a safety control measure for an N-2 fault of primary and secondary sectional lines of a DC converter station can be calculated online automatically rapidly, a calculation result is accurate, the intensity of manual calculation can be reduced greatly, the working efficiency of power-grid staff is improved, and the method is suitable for a reception-end AC system which has a problem in trend evacuation due to limitation of heat stability of near-area lines after large-capacity DC is fed in.

Description

technical field [0001] The invention belongs to the field of power system operation and control, and in particular relates to an online evaluation method for AC line fault safety control quantity based on the sensitivity of the rapid drop DC. Background technique [0002] In order to ensure the safe and stable operation of the power system, in addition to establishing a reasonable grid structure and arranging a reasonable operation mode, appropriate safety and stability control measures should also be provided. With the rapid development of UHV DC in my country, the transmission power of DC lines has been greatly increased. Compared with conventional DC, UHV DC is constrained by the thermal stability of the line near the converter station, and the problem of tidal current evacuation near the converter station has become increasingly prominent. Especially the problem is more serious in the near-area line maintenance mode. At present, the power grid operation mode personnel st...

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Application Information

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IPC IPC(8): H02J3/00G01R31/00
Inventor 曾兵刘明松张健屠竞哲易俊贺庆马士聪王歆
Owner STATE GRID CORP OF CHINA
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