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Dynamic impedance based stability characteristic estimation method of power system

A power system stabilization, power system technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as the inability to fully quantify the importance of dynamic electrical characteristics

Active Publication Date: 2016-05-25
HUNAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, new dynamic analysis methods have been continuously proposed, such as establishing a multi-objective dynamic optimization model, calculating dynamic power flow, considering network structure entropy, etc., but they are mainly aimed at a specific operating condition, which makes the results have certain limitations , it is impossible to fully quantify the dynamic electrical characteristics and their importance between regions. Therefore, it is urgent to provide an evaluation method that can quantify and track the stability characteristics of power systems in the dynamic process in real time.

Method used

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  • Dynamic impedance based stability characteristic estimation method of power system
  • Dynamic impedance based stability characteristic estimation method of power system
  • Dynamic impedance based stability characteristic estimation method of power system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Through the simulation of a 3-node simple chain system, a method for evaluating the stability characteristics of a power system based on dynamic impedance is described, including the following steps:

[0077] Step 1: In a 3-node system, obtain the network connection characteristics at the time of analysis. Specific data such as figure 2 As shown in , the perturbation method adopts the synchronous power growth perturbation.

[0078] Step 2: Set the synchronous power growth disturbance of the whole network, and calculate the entire power system based on PSASP, and obtain the power flow data at some moments as follows:

[0079]

[0080] Calculate the dynamic equivalent impedance matrix of the system at some time points:

[0081] When t=1:

[0082] Z d y n - 1 / 1 = ...

Embodiment 2

[0091] By simulating the IEEE39 system, a method for evaluating the stability characteristics of power systems based on dynamic impedance is described, including the following steps:

[0092] Step 1: In the IEEE39 node system, obtain the network connection characteristics at the time of analysis. Internet connection such as Figure 5 As shown, the network parameters are shown in the table below, and the disturbance method adopts the synchronous power increase disturbance.

[0093]

[0094]

[0095] Step 2: Set the synchronous power growth disturbance of the whole network, calculate the whole system based on PSASP, and obtain the power flow data at some times as follows (taking load nodes as an example):

[0096] When t=0.79

[0097]

[0098] When t=0.8

[0099]

[0100]

[0101] When t=0.89

[0102]

[0103] When t=0.9

[0104]

[0105]

[0106] When t=0.99

[0107]

[0108] When t=1

[0109]

[0110] From the power flow calculation, the dy...

Embodiment 3

[0124] Through the simulation of the actual operating system in a province in central China, a method for evaluating the stability characteristics of power systems based on dynamic impedance is described, including the following steps:

[0125] Step 1: In this system, the network connection characteristics at the time of analysis are obtained. The main grid structure is as Figure 8 As shown in , some main parameters are shown in the table below, and the disturbance method adopts the synchronous power increase disturbance.

[0126]

[0127]

[0128] Step 2: Set the synchronous power growth disturbance of the entire network, calculate the entire power system based on PSASP, and obtain the power flow data of some nodes at each time as follows:

[0129] When t=0.99

[0130]

[0131]

[0132] When t=1

[0133]

[0134] When t=1.09

[0135]

[0136] When t=1.1

[0137]

[0138] When t=1.19

[0139]

[0140] When t=1.2

[0141]

[0142] The dynamic ...

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Abstract

The invention discloses a dynamic impedance based stability characteristic estimation method of a power system. The method comprises the following steps of 1, acquiring connection characteristic of a target network; 2, setting a disturbance mode, and figuring a dynamic equivalence impedance matrix of each moment according to a power flow equation; 3, obtaining dynamic characteristics of a source-network-charge node of the power system according to the dynamic equivalence impedance matrix; and 4, calculating a self-stabilization factor and a stabilization factor of the node according to different source-network-charge dynamic electric characteristics for analyzing the characteristic between the node and the whole network. By the method, the influence characteristic among nodes during the dynamic process can be quantitatively analyzed, and finally, the dynamic characteristic between each node and the whole network is obtained.

Description

technical field [0001] The invention relates to a method for evaluating the stability characteristics of a power system based on dynamic impedance. Background technique [0002] With the rapid development of the global economy, the scale of the power network is also increasing, especially the continuous application of new technologies and equipment, making the characteristics of the various parts of the power grid more and more complex. The safe and stable operation of the power network is more and more related to the national economy and people's livelihood and national security. With the continuous expansion of the scale of the power grid, the dynamic characteristics of the power grid increasingly reflect complex nonlinear characteristics, and the traditional modeling methods have become increasingly difficult to calculate the degree of coupling and correlation between nodes. In the past system dispatching operation, the staff often can only judge the dynamic characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCG06Q50/06H02J3/00H02J2203/20Y04S10/50
Inventor 李欣然胡臻宋军英李培强张润贤
Owner HUNAN UNIV
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