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Screening method for expected fault in online transient safety and stability assessment of power system

A transient safety and stability, power system technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of large number of faults, long time for temporary stability evaluation of a single fault, etc., to improve calculation speed and reduce expectations. The effect of fault set size

Active Publication Date: 2012-01-18
NARI TECH CO LTD
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Problems solved by technology

As the scale of the power system increases, the expected number of faults that require online transient stability assessment will be large, and the time for transient stability assessment of a single fault will also become longer

Method used

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  • Screening method for expected fault in online transient safety and stability assessment of power system
  • Screening method for expected fault in online transient safety and stability assessment of power system

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Embodiment Construction

[0013] Attached below figure 1 , The method of the present invention is described in detail.

[0014] figure 1 Step 1 describes that if an expected fault is the first online transient stability assessment, then go to step 6 without screening; otherwise, go to step 2 for screening, that is, the fault has been online last time The results of the temporary stability assessment include 4 parts:

[0015] (1) The generator dominant mode with transient power angle stability and its margin and equivalent reactance, and several generator sub-dominant grouping modes where the difference between the transient power angle stability margin and the dominant mode stability margin is less than the set value , Denoted as {[ , ( , ,..., ), ],...,[ , ( ,..., ,..., ), ],..., ( , ( ,..., ,..., ), ]}, where N is the number of generators, m is the total number of generator-dominant modes and several sub-dominant modes that meet the above requirements, Is the stability margin of the i-th...

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Abstract

The invention belongs to the technical field of the analysis of power systems, and provides a method which is suitable for screening expected fault in online transient safety and stability assessment. The transient safety and stability of a certain expected fault in the power system are closely related to the running state of the power system. In the invention, influences of other factors in the running state of the power system on a transient safety and stability margin are calculated based on a quantitative analysis method of the transient safety and stability by adopting a margin-time function in which the transient safety and stability margin decreases as time increases after key influence factors such as a clustering mode, the change of an output force, the change of a load, the charging and discharging of an element and the like of a generator are taken into comprehensive consideration; an estimation and mode determination method of the transient safety and stability after the running state of the power system is changed is put forward; and time domain simulation is not carried out any more for the expected fault of which an estimated value is larger than a threshold, so that the calculation speed of the online transient safety and stability assessment is increased.

Description

technical field [0001] The invention belongs to the technical field of power system analysis and is suitable for online safety and stability evaluation of power systems. Background technique [0002] Type here the background technology description paragraph Online transient security and stability (abbreviation: temporary stability) evaluation has become an urgent need for large power grid dispatching operation, and its calculation period is generally required to be within 5 minutes. With the increase of power system scale, the expected number of faults that need online transient stability assessment will be large, and the time of transient stability assessment for a single fault will also be longer. For a large power grid with thousands of generators and tens of thousands of computing nodes, if the expected faults are not screened and the temporary stability evaluation of tens of thousands of expected faults is completed within 5 minutes, a large number of computing resource...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 徐泰山鲍颜红李碧君薛禹胜方勇杰薛峰徐伟刘韶峰马明周海峰
Owner NARI TECH CO LTD
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