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Power grid system transient destabilization differentiation method

A power grid system, transient instability technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as inaccurate judgment results

Inactive Publication Date: 2012-06-20
HOHAI UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the inaccuracy of the discrimination results existing in the prior art, and provide a transient instability discrimination method of the power grid system. On the basis of the system's transient kinetic energy and the slight change of the transient total energy are introduced into the discrimination basis, thereby improving the accuracy of the discrimination results

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  • Power grid system transient destabilization differentiation method
  • Power grid system transient destabilization differentiation method
  • Power grid system transient destabilization differentiation method

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Embodiment Construction

[0061] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0062] The idea of ​​the present invention is based on the existing transient instability discrimination method based on the geometric characteristics of the phase plane trajectory, and introduces the slight change of the system's transient kinetic energy and transient total energy into the discrimination basis, thereby improving the accuracy of the discrimination result specific; follow the steps below:

[0063] Step 1, judge whether there is a disturbance in the grid system, if so, turn to step 2; the judgment of the grid disturbance can adopt various existing technologies, for example (several existing methods are cited here), the present invention adopts the following methods:

[0064] Step 101, using the phasor measurement unit to collect the electromagnetic power of each generator in the grid system in real time;

[0065] Step 102, respectively c...

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Abstract

The invention discloses a power grid system transient destabilization differentiation method, is applicable to a power grid dispatching and control center provided with a wide area measuring system. Based on the transient destabilization differentiation method for the conventional tract geometry characteristic, the invention introduces the micro-variable quantity of the transient kinetic energy and the transient total energy to serve as differentiation reference so as to improve the accuracy of the differentiation result, and further improves the differentiation effect via tract fitting and grouping re-evaluation. Compared with the prior art, the invention can obtain more accurate and reliable transient destabilization differentiation effect.

Description

technical field [0001] The invention relates to a method for judging transient instability of a power grid system and an emergency control method, which is suitable for a power grid dispatching control center with a Wide Area Measurement System (WAMS). Background technique [0002] With the increasing demand for electricity and the continuous expansion of the grid scale, the operation of modern power systems is getting closer to its stability boundary. With the use of various new technologies and control devices, the dynamic characteristics of the power grid are more complex and changeable, and transient instability accidents occur frequently. Studies have shown that transient instability is the chief culprit that affects the safe and stable operation of the power grid and even causes large-scale power outages in the power grid. Therefore, in order to maintain the normal operation of the whole network, efficient and reliable real-time analysis and emergency control of power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 赵晋泉邓晖
Owner HOHAI UNIV
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