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: 2013-09-25
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 solution of the present invention will be described in detail below in conjunction with the drawings:

[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 the slight change of the transient kinetic energy of the system and the total transient energy is introduced into the discrimination basis, thereby improving the accuracy of the discrimination result Sex; specifically follow the steps below:

[0063] Step 1. Determine whether there is a disturbance in the power grid system. If yes, go to step 2. The power grid disturbance can be determined by various existing technologies, for example (here are several existing methods), the present invention adopts the following methods:

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

[0065] Step 102: Calc...

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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, and is suitable for a power grid dispatching control center that has built a wide area measurement system (WAMS). Background technique [0002] With the increasing demand for electricity today, the scale of the grid continues to expand, and the operation of the modern power system is 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 frequently occur. Studies have shown that transient instability is the main culprit that affects the safe and stable operation of the power grid and even causes a large-scale blackout of the power grid. Therefore, in order to maintain the normal operation of the entire network, efficient and reliable real-time analysis and emergency control of tran...

Claims

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Application Information

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