Assessment method for transient voltage stabilization of load area of electrical power system

A technology for transient voltage stability and power system, applied in system integration technology, information technology support system, electrical components, etc., can solve the problem of not fully exploiting the advantages of data mining methods.

Active Publication Date: 2015-05-13
TSINGHUA UNIV
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Problems solved by technology

However, some traditional evaluation methods based on data mining are carried out on the premise that the theoretical basis of the research problem is relatively complete, and few studies involve the evaluation of regional t...

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  • Assessment method for transient voltage stabilization of load area of electrical power system
  • Assessment method for transient voltage stabilization of load area of electrical power system
  • Assessment method for transient voltage stabilization of load area of electrical power system

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Embodiment Construction

[0048] The evaluation method of the transient voltage stability in the power system load area proposed by the present invention comprises the following steps:

[0049] (1) The schematic diagram of the single-line structure of the power system involved in the evaluation method of the present invention is as follows: figure 1 As shown, suppose there are k nodes in the load area of ​​the power system, figure 1 Shown is an embodiment of the present invention, in a 36-node test system, for the power system load area surrounded by the dotted line, there are 6 nodes including nodes 16, 18, 19, 20, 21 and 29 in this area, The serial numbers of each node are 1, 2, ..., k, respectively. When the power system is in the steady-state operation state A, the voltage, current, and active power of the node are collected from the synchrophasor measurement unit of each node at a time interval of ΔT and real-time measurement data of reactive power, the sampling time is T, and when the steady-sta...

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Abstract

The invention relates to an assessment method for transient voltage stabilization of a load area of an electrical power system and belongs to the electrical power system stability analyzing and assessment field. The assessment method for the transient voltage stabilization of the load area of the electrical power system includes that using data measured by a synchronous phasor measurement unit as basis, and building an initial sample database for data mining through a lot of simulation samples; extracting characteristics for reflecting the stabilization degree of each node through the quantitative evaluation for each node in the area; identifying through a multiple linear regression method to obtain sensitivity coefficients for reflecting the mutual influence relations between the nodes in a local area network; using a semi-supervised clustering method to demarcate all the samples; using a decision tree algorithm to perform classified learning to obtain a decision tree model, and using the decision tree model for online monitoring to assess the global transient voltage stabilization state of the load area of the electrical power system.

Description

technical field [0001] The invention relates to an evaluation method for transient voltage stability in a load region of a power system, belonging to the field of power system stability analysis and evaluation. Background technique [0002] In recent years, there have been many voltage collapse accidents around the world, which have drawn more and more attention to the voltage stability of power systems. The transient voltage instability or collapse caused by short-term large disturbance is particularly serious. If the regional transient voltage instability can be accurately judged during online monitoring and preventive and control measures are taken in time, it will help to contain the transient voltage instability accident. The large-scale cascading voltage instability or collapse caused by some nodes improves the overall stability of the region. In actual operation, engineering criteria based on fixed voltage thresholds are often used to judge transient voltage instabil...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F19/00
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 陆超朱利鹏韩英铎
Owner TSINGHUA UNIV
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