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Rapid Screening Method for Expected Fault Sets in Power System Transient Stability Assessment

A technology for transient stability evaluation and predicting fault sets, which is applied in prediction, instrumentation, data processing applications, etc., can solve the problems of increased calculation amount and reduced screening accuracy, and achieve the effect of accuracy, speed and high screening performance

Active Publication Date: 2016-06-22
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

However, in the existing screening methods: in order to improve the screening rate, the screening indicators used only reflect part of the characteristics of the transient process, and do not fully reflect (or at least roughly account for) the physical characteristics of the entire transient process, resulting in the loss of screening accuracy. or to ensure the screening accuracy, the fault screening problem is equal to the transient stability calculation problem, resulting in an increase in the amount of calculation required for screening; the application of artificial intelligence methods (machine learning methods) for fault screening of some specific systems can ensure accuracy at the same time Sex and speed, but its robustness is questionable

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  • Rapid Screening Method for Expected Fault Sets in Power System Transient Stability Assessment
  • Rapid Screening Method for Expected Fault Sets in Power System Transient Stability Assessment
  • Rapid Screening Method for Expected Fault Sets in Power System Transient Stability Assessment

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Embodiment Construction

[0025] Refer to the attached figure 1 And the present invention is described in further detail in conjunction with examples.

[0026] figure 1 Step 1 in the above describes that after the transient stability evaluation system is started, a certain example in the expected fault ensemble is taken out, and the transient stability margin is calculated for the example using the SEEAC algorithm.

[0027] figure 1 Step 2 in the description is the first layer of screening rules, if the fault clearing time τ of the calculation example is less than or equal to the threshold ε 1 And the stability margin η obtained by calculating the transient stability margin by the SEEAC algorithm SE (τ) is greater than the threshold ε 2 (τ), filter it out directly, end the screening of the example, go to step 8, otherwise go to step 3.

[0028] figure 1 Step 3 in the above discloses a calculation method that reflects the time-varying degree of the research example: apply the SEEAC algorithm to ob...

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Abstract

The invention discloses a rapid screening method of expected failure sets in electric power system transient stability assessment, and belongs to the technical field of an electric power system and the automation thereof. The rapid screening method is based on an extended equal-area criterion (EEAC), adopts a researched calculation example time-varying degree and the transient stability margin, which are reflected by transient stability analysis algorithms with different simplification degrees, as indexes, and combines researched calculation example failure information so as to match and combine into different screening criteria. Expected failure subsets satisfying the screening criteria are screened out in a layered mode from an expected failure universal set, thereby greatly reducing the number of expected failures requiring detailed transient stability analysis. The rapid screening method disclosed by the invention can improve the rapidity of the transient stability assessment under the premise of guaranteeing the accuracy of the transient stability assessment, thereby appropriately coordinating the accuracy and the speed of the transient stability assessment.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for screening expected failure sets for power system transient stability evaluation. Background technique [0002] The continuous expansion of the scale of the modern power system, the more mature power market mechanism and the rapid development of UHV smart grid construction have put forward higher requirements for the accurate and rapid assessment of the transient stability of the power system. For a long time, the speed and accuracy of transient stability analysis have always been a pair of contradictions: the time domain simulation method can achieve accurate transient stability analysis, but it not only has a large amount of calculation but also cannot quantitatively give stability margin indicators; based on Although the direct method of transient stability analysis of Lyapunov theory (such as RUEP metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/06
Inventor 薛禹胜黄天罡薛峰
Owner STATE GRID ELECTRIC POWER RES INST
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