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Method for calculating mixed continuation power flow at voltage stability boundary

A stable boundary, mixed continuous technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of long time for calculating voltage stability boundary, and achieve the effect of quickly obtaining, overcoming the prolongation of calculation time and improving calculation speed.

Inactive Publication Date: 2013-02-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of hybrid continuous power flow method for calculating the voltage stability boundary, to solve the problem of long time for calculating the voltage stability boundary in the prior art

Method used

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  • Method for calculating mixed continuation power flow at voltage stability boundary
  • Method for calculating mixed continuation power flow at voltage stability boundary
  • Method for calculating mixed continuation power flow at voltage stability boundary

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Experimental program
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specific Embodiment approach 1

[0019] Specific Embodiment 1: This embodiment is realized by the following steps: 1. Read the load node network impedance matrix (can be called online from the database that has been calculated offline in advance) and the basic data of power flow calculation (the basic data of power flow calculation mainly includes nodes data and line data, etc.), and initialize k and L am (k) and other parameters;

[0020] 2. Execute power flow calculation to find the voltage and current phasors of each load node;

[0021] 3. Calculate the system voltage stability characteristic index r in the current state min :

[0022] r min = min ( | V i Σ j = 1 n Z ...

specific Embodiment approach 2

[0052] Specific implementation mode two: the following is an implementation example of the present invention, taking Poland 2746 node system as an example to test and analyze, the simulation results are as follows Figure 5 and 6 shown. The specific steps and results are as follows:

[0053] 1. Read the load node network impedance matrix and the basic data of power flow calculation, and initialize k=1 and L am (1)=1 and other parameters.

[0054] 2. Perform power flow calculations to find the voltage and current phasors of each load node, and then calculate the voltage stability characteristic index r min = 3.828.

[0055] 3. Due to the current state of r min Much larger than 1, so need to update k(k=2) and L am (k):

[0056] L am ( 2 ) = 1 + r min 2 * ...

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Abstract

The invention discloses a method for calculating mixed continuation power flow at a voltage stability boundary, relates to a method for calculating the voltage stability boundary through the mixed continuation power flow and solves the problem that the voltage stability boundary is calculated for a long time in the prior art. The invention provides a characteristic index which has analytic property and can be effectively used for describing the voltage stability of the system based on a network equivalent and impedance matching conception, the index is used for step length control in the process of calculating the continuation power flow, and the calculating speed of the continuation power flow is effectively improved. The process of solving the voltage stability boundary is divided into two stages, namely in the stage 1, the approximate voltage stability boundary of the system is rapidly solved due to long step length; and in the stage 2, the voltage stability boundary is accurately calculated due to the conventional continuation power flow. In the whole calculation process, that whether the system is close to a limit operating state and when the stage 1 and the stage 2 are replaced can be effectively judged through the characteristic index.

Description

technical field [0001] The invention relates to a method for calculating voltage stability boundary by using mixed continuous power flow, which belongs to the field of power system operation analysis and safety control. Background technique [0002] Due to the frequent occurrence of voltage stability accidents and the large-scale grid connection of various intermittent energy sources in recent years, the static voltage stability (power transmission limit) of the power system has attracted great attention from the academic community and the power grid operation, management and planning departments. . Static voltage stability analysis is an important functional module in the power system operation planning and energy management system. It plays an important role in power system analysis and is of great significance to the safe operation of the power grid. [0003] At present, static voltage stability analysis mostly adopts analysis methods based on conventional power flow or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 李卫星牟晓明孙勇
Owner HARBIN INST OF TECH