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Forecast accident power system voltage stabilization fast on-line analyzing and preventing control method

A voltage stability and accident prediction technology, applied in the field of fast online analysis and preventive control of power system voltage stability, can solve problems such as slow calculation speed, time-consuming branch fault analysis, and the need for initial values

Inactive Publication Date: 2008-07-16
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The calculation of the continuous method does not require an initial value, but the calculation speed is slow. When it is necessary to analyze a large number of branch faults, it is very time-consuming and cannot meet the requirements of online applications. At the same time, there are some extremely serious faults that make the continuous power flow unable to convergence
Although the direct method has a faster calculation speed, it needs an initial value, and an improper initial value often leads to non-convergence of iterations.
In addition, there is a method based on the load margin and the first-order sensitivity of fault parameters to estimate the load margin after line removal. In most cases, the load margin estimated by the first-order sensitivity has a large error (as shown in Figure 3 and Figure 4 shown), and the system operation status (node ​​voltage, etc.)

Method used

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  • Forecast accident power system voltage stabilization fast on-line analyzing and preventing control method
  • Forecast accident power system voltage stabilization fast on-line analyzing and preventing control method
  • Forecast accident power system voltage stabilization fast on-line analyzing and preventing control method

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Embodiment 1

[0195] The original data of the IEEE 30 bus simple system can be found in the relevant information. Taking this system as an example, the active load and reactive load of all nodes increase proportionally, and the SNB of the base state network is obtained by using the continuous power flow method. Four branch faults including "5-7", "15-23", "22-24" and "4-12" were selected as the research objects. Figure 3 shows the trajectory curve of the load margin at the SNB point approaching from the fault forward to the fault when the three-phase open-circuit fault occurs in different lines, where n represents the number of Taylor series expansions. It can be seen from Figure 3 that it is difficult to obtain the load margin at the SNB point after the fault with the first-order approximation. The faults of some non-critical lines can be approximated by the 2nd to 3rd order derivatives. The load margin of the SNB point after the fault , for most faults including more serious faults; the ...

Embodiment 2

[0202] For the original data of the IEEE-118 node system, please refer to the related materials. Taking this system as an example, the active load and reactive load of all nodes increase proportionally, and the SNB of the base state network is obtained by using the continuous power flow method. Four branch faults including "15-19", "44-45", "30-38" and "45-46" were selected as the research objects. Figure 4 shows the approximation trajectory of the SNB point after the three-phase open-circuit fault occurs in these lines.

[0203] Table 2 shows the comparison between the load margin of the SNB point obtained by using the 7th derivative approximation when the above line fails and the accurate solution of the load margin of the SNB point after the fault calculated by the continuous power flow method.

[0204] Table 2: IEEE-118 node system results comparison between the method described in this patent and the continuous power flow method

[0205] fault branch

[0206] ...

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Abstract

The invention discloses an anticipated accident electric power system voltage stabilization rapid on-line analysis and prevention and control method. The data is collected by a data collecting system and is processed by the state estimation; subsequently, the present state of operation is obtained. A total network nodal voltage at the position of SNB under the basic state network topology and a load power margin are obtained by adopting the continuation power flow calculation; a right characteristic vector of a feature value of zero of a Jacobian matrix at the SNB is calculated. The SNB Jacobian matrix forms and calculates a coefficient matrix of each higher derivative under different anticipated accidents of the total network nodal voltage at the critical point and the load power margin is calculated; the higher derivative of the voltage stabilization critical point and the load power margin with the accident parameters under different anticipated accidents is calculated; the voltage at the voltage stabilization critical point and the load power margin under the anticipated accident is calculated. The anticipated accident with a minus load power margin is warned and the prevention control quantity is given. The invention can be applicable to the on-line voltage stabilization evaluation of a large scale power system for guaranteeing the voltage stabilization.

Description

technical field [0001] The invention relates to a power system voltage stabilization technology, in particular to a fast on-line analysis and preventive control method for the power system voltage stability under single or multiple fault prediction accidents of the power grid. Background technique [0002] Voltage stability refers to the ability of each branch to maintain voltage stability after the initial operating state of the power system is disturbed, and it is a major aspect of power system security issues. With the rapid development of the power system and the continuous expansion of the grid scale, the probability of voltage instability and even voltage collapse accidents is increasing. The voltage instability process can be described as a monotonically decreasing voltage curve. This curve drops very slowly at the beginning, and as time goes by, the voltage drop rate increases rapidly, and when the system cannot meet the load demand, a voltage collapse occurs. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/00
Inventor 吴政球赵柯宇
Owner HUNAN UNIV
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