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Method for static electric voltage stability analysis

A static voltage and stability technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as time-consuming calculation and non-convergence

Active Publication Date: 2009-04-08
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

Second, at the critical point (inflection point), the conventional power flow calculation method (corresponding to the Newton-Raphson method for constant power load) does not converge
However, this method is very time-consuming to calculate

Method used

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  • Method for static electric voltage stability analysis
  • Method for static electric voltage stability analysis
  • Method for static electric voltage stability analysis

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Embodiment Construction

[0100] Take the real-time data section of Chongqing Power Grid on a certain day in 2008 as an example. There are 305 buses, 132 lines, and 91 transformers in this section. adjust. Three algorithms are used to calculate the static voltage stability margin of this section. Algorithm 1 is the standard continuous power flow method, algorithm 2 is the linear simulation method, and algorithm 3 is the continuous power flow method based on the linear simulation method. The calculation results are shown in Table 1.

[0101] Taking the continuous power flow (Algorithm 3) based on the linear simulation method as an example, first input the grid parameters, and use the PSD-BPA power flow calculation method to obtain the power flow solution of the basic working condition, set t=0, and form S PQ matrix and calculate judge Is it greater than 0, d 2 V d P ...

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Abstract

The invention provides a method used for analyzing the stability of a static voltage; the characteristics of fast calculation speed of a linear simulation method and the accurate calculation of a continuous tide method are utilized and combined by the method, thus being capable of fast and accurately working out the stable margin of the voltage of an electric network under a certain load-increasing mode. The analytical method is suitable not only for the stable off-line analysis of the static voltage, but also for the on-line application of an automatic voltage control system.

Description

technical field [0001] The invention relates to the field of power system simulation calculation, in particular to a method for static voltage stability analysis. Background technique [0002] The level of voltage stability at different points in the network can be determined using conventional power flow programs. However, this approach is laborious and does not provide sensitivity information that is very useful for decision making. Furthermore, due to the singularity of the Jacobian matrix, the conventional power flow has no solution outside the collapse point and does not reliably converge near the collapse point. [0003] For dispatchers, the most practical safety index for voltage stability should be the power margin index, which requires a more accurate determination of the critical point, two important parameters that indicate the strength of each load node's ability to maintain voltage stability: load point critical voltage and limit power. To do this, we need to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/50
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 马世英陈勇宋墩文王丽敏杜三恩陈得治
Owner CHINA ELECTRIC POWER RES INST
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