Prediction method for rapidly judging power system transient stability

A power system and transient stability technology, applied in the direction of measuring electricity, electrical components, measuring devices, etc., can solve problems such as poor accuracy and long prediction time, and achieve the effect of improving accuracy, improving prediction time, and improving safety and stability

Inactive Publication Date: 2017-05-10
STATE GRID TIANJIN ELECTRIC POWER +1
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Problems solved by technology

The traditional power system transient stability prediction method mainly uses the phase trajectory geometric characteristic criterion and the...

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  • Prediction method for rapidly judging power system transient stability
  • Prediction method for rapidly judging power system transient stability
  • Prediction method for rapidly judging power system transient stability

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Embodiment Construction

[0022] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0023] A prediction method for quickly judging the transient stability of a power system, such as figure 1 shown, including the following steps:

[0024] Step 1. Use WAMS to obtain real-time measurement data of the disturbed power angle trajectory in each judgment cycle.

[0025] Step 2. The multi-computer system performs coherent grouping processing on the measurement data.

[0026] Step 3. Use the improved LS-SVR algorithm to obtain the power angle prediction trajectory {x} in a period of time in the future.

[0027] Step 4. Determine whether there is a maximum value in the power angle. If there is a maximum value, it is judged that the system is stable; if there is no maximum value, perform step 5.

[0028] Step 5. Use phase space reconstruction to split power angle prediction trajectory {x} into two subsequences {x 1 , x 2}, calculate the ...

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Abstract

The invention relates to a prediction method for rapidly judging the power system transient stability. The technical characteristics of the prediction method comprise the following steps that the real-time measurement data of disturbed power angle trajectories are acquired by using a WAMS in each judgment period; a multicomputer system performs homological grouping on the measurement data; the power angle prediction trajectories in a period of time in the future are acquired by using an improved LS-SVR algorithm; the maximum value of the power angle is judged so as to perform stability judgment; the power angle prediction trajectories are split into two subsequences by using phase-space reconstruction and the standard deviation sigma and the standard deviation offset eta of each subsequence are calculated; and whether the standard deviation offset eta is less than 0 is judged so as to perform system stability judgment. Transient stability prediction is performed by using the phase-space reconstruction criterion so that the prediction time and the accuracy can be obviously enhanced in comparison with the conventional criterion, stability loss prediction time is improved to 1.1s from 1.4s, and thus the precious time is won for subsequent emergency control and the safety stability of the system can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of power system transient stability prediction, in particular to a prediction method for quickly judging the power system transient stability. Background technique [0002] With the continuous development of large-scale interconnected power grids, the safe and stable operation of power grids is facing new challenges, so there are higher requirements for power system transient stability analysis methods. Traditional power system transient stability prediction methods mainly use the phase trajectory geometric characteristic criterion and the power angle difference threshold value criterion. Using the above criterion to predict has problems such as long prediction time and poor accuracy. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a reasonably designed and highly accurate prediction method for quickly judging the transie...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F17/50G01R31/00
CPCG01R31/00G06F30/20H02J3/00H02J2203/20Y02E60/00
Inventor 赵聪李松原李苏雅唐庆华满玉岩王伟陈荣
Owner STATE GRID TIANJIN ELECTRIC POWER
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