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A weak voltage transient stability node analysis method and device

A technique of transient stability and node analysis, applied in circuit devices, AC network voltage adjustment, electrical components, etc., can solve the problems of inability to quantify the bus voltage stability margin, difficulty in determining the critical energy of function construction, and difficulty in evaluating weak areas of system voltage, etc. question

Active Publication Date: 2022-02-08
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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Problems solved by technology

The energy function method directly uses the energy function to estimate the transient stability, but its function construction and determination of the critical energy are difficult
At present, the practical criterion of the power system safety and stability calculation specification is mostly used in engineering practice: in the transient process after the power system is disturbed, the load bus voltage can recover to more than 0.8pu within 10s of the fault, but this The method can only determine whether the bus voltage is unstable, but cannot quantify the stability margin of the bus voltage, and it is difficult to evaluate the weak voltage area in the system

Method used

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  • A weak voltage transient stability node analysis method and device
  • A weak voltage transient stability node analysis method and device
  • A weak voltage transient stability node analysis method and device

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Embodiment Construction

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0016] see figure 1 , which shows a flow chart of a weak voltage transient stable node analysis method of the present application.

[0017] Such as figure 1 As shown, a weak voltage transient stability node analysis method includes the following steps:

[0018] In step S101, a bus branch model of an actual power grid is established, and a power...

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Abstract

The invention discloses a weak voltage transient stability node analysis method and device. The method includes: performing power grid transient stability simulation calculation on a bus branch model based on a power grid fault set; adopting a multi-binary table method to quantitatively calculate the transient state of a bus pair fault Voltage stability margin index; according to the severity of the fault, the binomial coefficient method is used to weight the transient voltage stability margin of the busbar response to different faults, and the comprehensive transient voltage stability margin of the busbar response fault set is obtained. The bus with a smaller degree value is a weak node; according to the most serious fault, the excitation voltage fluctuation is applied to the generator set, and the change of the voltage margin of the weak node is observed, so as to locate the sensitive unit. The binomial coefficient method is used to weight the transient stability margin of the busbar under different faults, and the comprehensive transient voltage stability margin of the busbar response fault set is obtained, so as to find the relatively weak busbar in the system, and then set the excitation for the unit Voltage fluctuations, determine the preferred synchronous generator set.

Description

technical field [0001] The invention belongs to the technical field of weak voltage transient analysis, and in particular relates to a weak voltage transient stable node analysis method and device. Background technique [0002] DC is fed into the AC grid at the receiving end. Since the DC operation needs to consume a large amount of reactive power, the bus voltage stability of the receiving end grid will be affected, which poses a challenge to the safe and stable operation of the grid. After DC feed-in, a large amount of reactive power will be consumed, which will affect the stability of the bus voltage of the power grid at the receiving end. In order to ensure the improvement of the stable operation level of the transient voltage of the power grid, and to provide technical support and theoretical guidance for improving the voltage stability and safe operation of the DC receiving-end power grid, it is necessary to determine the weak areas of voltage support in the receiving-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/12G06F30/20G06F113/04
CPCH02J3/00H02J3/24H02J3/12G06F30/20H02J2203/10H02J2203/20G06F2113/04
Inventor 陈波熊华强郭培潘本仁舒展彭晓涛程思萌陶翔汪硕承刘柳
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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