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Method and system for analyzing power fluctuation of interconnection tie of three-area-interconnected power system

A tie-line power and power system technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of power oscillation waveform and power peak error, inaccuracy, etc., to achieve the effect of solving inaccurate power fluctuations

Active Publication Date: 2014-07-16
NORTH CHINA ELECTRICAL POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large error in the waveform of the power oscillation and the power peak value, and the relative error of the peak power variation is 22.62%, which is very inaccurate

Method used

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  • Method and system for analyzing power fluctuation of interconnection tie of three-area-interconnected power system
  • Method and system for analyzing power fluctuation of interconnection tie of three-area-interconnected power system
  • Method and system for analyzing power fluctuation of interconnection tie of three-area-interconnected power system

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Embodiment 1

[0042] like Image 6 As shown, the embodiment of the present invention provides a method for analyzing power fluctuations of tie lines in a three-area interconnected power system, the method comprising:

[0043] Obtain the oscillation frequency ω, damping ratio ζ, left eigenvector ψ, and right eigenvector φS601 when power disturbance occurs in the three-area interconnected power system; according to ω, ζ, ψ, φ, and ΔP TL (t)=P TLt -P TLS Analysis gets θ 1 , θ 2 、A 1 and A 2 S602; use θ 1 , θ 2 、A 1 、A 2 and Get the fluctuating power ΔP TL S603.

[0044] In step S601, obtaining the natural oscillation frequency ω, the damping ratio ζ, the left eigenvector ψ and the right eigenvector φ when power disturbance occurs in the three-area interconnected power system includes:

[0045] Use the tie line power oscillation curve or eigenvalue analysis method to obtain the natural oscillation frequency ω and damping ratio ζ when the power disturbance occurs in the thr...

Embodiment 2

[0180] like Figure 12 As shown, the embodiment of the present invention provides a three-area interconnection power system tie line power fluctuation analysis system, the system includes: an information acquisition unit 1201 , a data analysis unit 1202 and a data analysis unit 1203 .

[0181] The information acquisition unit is used to acquire the oscillation frequency ω, damping ratio ζ left eigenvector ψ and right eigenvector φ1201 when power disturbance occurs in the three-area interconnected power system.

[0182] The data analysis unit 1202 according to ω, ζ, ψ, φ, and ΔP TL (t)=P TLt -P TLS Analysis gets θ 1 , θ 2 、A 1 and A 2 .

[0183] Fluctuating power analysis unit 1202 utilizes θ 1 , θ 2 、A 1 、A 2 and Get the fluctuating power ΔP TL .

[0184] The information acquisition unit 1201 may also include: a parameter acquisition module and a feature vector acquisition module, the parameter acquisition module acquires the oscillation frequency ω and t...

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Abstract

The present invention provides a method and system for analyzing power fluctuations of tie lines in a three-area interconnected power system. The method includes: obtaining the oscillation frequency ω, damping ratio ζ, left eigenvector ψ, and right Eigenvector φ; get θ1, θ2, A1 and A2 according to ω, ζ, ψ, φ, and ΔPTL(t)=PTLt-PTLS analysis; use θ1, θ2, A1, A2 to obtain fluctuating power ΔPTL. The invention can accurately obtain the power fluctuation when there are two main oscillation modes.

Description

technical field [0001] The present invention relates to the power system analysis technology, especially to the power analysis technology of the tie line of the regional interconnected power system, and specifically to a method and system for analyzing the power fluctuation of the tie line of the three-area interconnected power system. Background technique [0002] When there is a power disturbance in the grid (load input or removal, generator shutdown, DC blocking, etc.), the sudden change of power will cause an imbalance between power generation and load. Before the system calms down to a new steady state, it will take An oscillating transient process is generated, causing the system frequency and power to oscillate, the tie line power flow will have oscillating power superimposed on it, and the UHV line will produce large power fluctuations. Large power fluctuations have become an important factor limiting the improvement of the transmission capacity of high-voltage tie l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 刘辉梁吉吴涛李群炬王丰张涛
Owner NORTH CHINA ELECTRICAL POWER RES INST