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Linear approximation method for border of static voltage stability domain of electric power system

A technology of static voltage stabilization and power system, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of lack of high efficiency, complex boundary topology characteristics, low computing efficiency, etc., to reduce computing time, improve perception ability, The effect of improving build efficiency

Active Publication Date: 2018-01-02
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, searching the SVSR boundary point by point is an important method to construct the static voltage stability domain. Although this method can construct a high-precision SVSR, its calculation efficiency is low; while the hyperplane approximation method can improve the construction efficiency of SVSR, but the SVSR constructed by it is conservative. stronger
[0005] In addition, the topological properties of the boundary are extremely complex, and it is difficult to use a unified hyperplane to describe analytically or obtain accurate and approximate general conclusions
Therefore, the construction of SVSR still lacks a general method that is efficient and guarantees good accuracy

Method used

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  • Linear approximation method for border of static voltage stability domain of electric power system
  • Linear approximation method for border of static voltage stability domain of electric power system
  • Linear approximation method for border of static voltage stability domain of electric power system

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Embodiment 1

[0050] An embodiment of the present invention provides a linear approximation method for the boundary of the static voltage stability domain of a power system, such as Figure 1-Figure 3 As shown, the method includes the following steps:

[0051] 101: Starting from the ground state power flow, the traditional optimal power flow is used to search for the first power system saddle node bifurcation point, and it is mapped to the two-dimensional active power injection space to obtain the boundary point of the static voltage stability domain;

[0052] 102: Change the power growth direction to the direction of the power growth direction angle decrease, calculate the saddle node bifurcation point of the power system under the new power growth direction through the Lagrangian multiplier method, and map it to the two-dimensional active power injection space to obtain new The boundary point of the static voltage stability domain; if the power growth direction angle is less than or equal...

Embodiment 2

[0056] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and accompanying drawings, see the following description for details:

[0057] 201: Taking the ground state power flow as the starting point, use the traditional optimal power flow to search for the first power system saddle node bifurcation point;

[0058] Wherein, the step 201 includes:

[0059] 1) Obtain basic data, including: power system topology, branch parameters and ground state power flow state variable x 0 ;

[0060] The step of acquiring basic data is well known to those skilled in the art, and will not be described in detail in this embodiment of the present invention.

[0061] 2) Let the power system have a total of n b +1 node, among them, PQ (that is, active power and reactive power are known quantities) node l, PV (that is, active power and voltage amplitude are known quantities) node n b -l, number 0 is the balance node, number 1~l is the PQ node...

Embodiment 3

[0126] The following combined with specific examples, Figure 4 , Figure 5 and Image 6 , and table 1 carries out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:

[0127] This example is to search the SVSR boundary of the WECC3 machine 9-node system as an example to verify the effectiveness of this method. The WECC3 machine 9-node test system is as follows: Figure 4 shown.

[0128] Taking the load nodes 7 and 9 as the key nodes of voltage stability, the active power injection of nodes 7 and 9 is selected as the coordinate axis, and this method is used to construct the SVSR in the two-dimensional active load injection space.

[0129] Set the power growth direction d 1 =[ΔS d2 ,ΔS d3 ,ΔS d4 ,ΔS d5 ,ΔS d6 ,ΔS d7 ,ΔS d8 ,ΔS d9 ] T =[0,0,0,0,0,1,0,0] T , adopting the model optimization model of the first power system saddle node bifurcation point, along the initial power growth direction d 1 , to search for t...

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Abstract

The invention discloses a linear approximation method for a border of static voltage stability domain of an electric power system, relating to the field of the border of the static voltage stability domains. The method comprises the following steps: searching a first electric power system saddle node bifurcation point through a traditional optimal power flow by taking a base power flow as an initial point, and mapping the first electric power system saddle node bifurcation point to a two-dimensional active injection space, so as to obtain the border of the static voltage stability domain; changing a power increase direction towards an increase direction of a power increase direction angle, and calculating a electric power system saddle node bifurcation point in the new power increase direction by virtue of a Lagrangian multiplier method; and ending the calculation when the power increase direction angle is smaller than or equal to 0: carrying out linear approximation on all obtained border points of the static voltage stability domain by virtue of a subsection approximation method, so as to obtain the approximated border of the static voltage stability domain. According to the linear approximation method, the obtained static voltage stability domain preserves relatively high precision, the time consumed for searching single electric power system saddle node bifurcation point byvirtue of the traditional optimal power flow is effectively shortened, and the practical application value for analyzing the stability by virtue of the static voltage stability domain is increased.

Description

technical field [0001] The invention relates to the field of the boundary of the voltage stability domain, in particular to a linear approximation method for the boundary of the static voltage stability domain of a power system. Background technique [0002] Since the 1970s, power system static voltage stability analysis has become an important part of power system stability analysis. Among many static voltage stability analysis methods, the continuation powerflow (CPF) method can accurately calculate the voltage collapse limit in a given direction according to a given direction, and has unique flexibility and practicability. The most widely used method in voltage stability analysis. [0003] However, in some scenarios, such as when studying the influence of certain nodes with large load fluctuations or nodes connected with new energy generation such as wind turbines on the voltage stability of the entire network, if the power growth direction is first determined by load fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY02E60/00
Inventor 姜涛李雪张明宇陈厚合李国庆张儒峰张嵩
Owner NORTHEAST DIANLI UNIVERSITY
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