Mathematical modeling method for steady-state random power fluctuation of alternating current connecting line

A technology of AC tie line and power fluctuation, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of improving the level of safe and stable operation

Active Publication Date: 2012-06-27
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

Former Soviet scientist M.T. Portnoy explained in his book "Control of Power System Stability" the irregular power fluctuations caused by load changes under steady state conditions, while the steady state random power of AC tie lines There are no relevant reports on the theoretical analysis and mathematical modeling of fluctuations

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  • Mathematical modeling method for steady-state random power fluctuation of alternating current connecting line
  • Mathematical modeling method for steady-state random power fluctuation of alternating current connecting line
  • Mathematical modeling method for steady-state random power fluctuation of alternating current connecting line

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings.

[0063] image 3 It is a schematic flow chart of this embodiment. Specifically, this embodiment proposes a mathematical modeling method for steady-state random power fluctuations of AC tie lines. The method includes the following steps:

[0064] Step A: According to the frequency-dependent static load model, the load fluctuation equation of the interconnected two-region power grid is obtained, and the load fluctuation value ΔP is established Li and load regulation effect coefficient K i (t) and frequency variation (ω i (t)-ω 0 ), and according to the characteristics of the weakly connected grid, the load fluctuation equation is simplified;

[0065] Step B: According to the steady-state transmission power equation of the tie-line and the characteristics of the weakly-connected grid, replace the phase angle of the tie-line with the equivalent generator power angle, an...

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Abstract

The invention provides a mathematical modeling method for steady-state random power fluctuation of an alternating current connecting line. Power grids are interconnected through the alternating current connecting line, and under the steady-state condition, long-cycle and irregular random power fluctuation on the connecting line is caused by load random fluctuation in the power grids at two ends. Based on a two-area alternating current connecting line power fluctuation model, according to the steady state operation and weak connecting line characteristics of large area power grids, a relation between the random power fluctuation and the power angle difference of equivalent generators is established, and a steady state random power fluctuation mathematical model of a two-area connecting line is obtained by solving a second-order differential equation of the power angle difference of the equivalent generators. The mathematical modeling method is applicable to theoretical and simulation analysis of a power system, the dynamic characteristic and connecting line random power fluctuation mechanism of two large-area interconnection power systems are mastered, the maximum amplitude of the steady-state random power fluctuation is computed, the system can conveniently operate, an analyst can timely take effective measures, and the safety and steady operation level of the power system is improved.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a mathematical modeling method for steady-state random power fluctuations of AC tie lines. Background technique [0002] According to the operation experience, in the normal operation process, there will be a certain range of power fluctuations on the tie lines between the regional power grids. This power fluctuation is produced by the joint action of many reasons, mainly including two components of low-frequency oscillation and irregular random power fluctuation. Among them, the low-frequency oscillation is caused by insufficient damping of the dominant oscillation mode between the two grids; the irregular random fluctuation is caused by the random load change of the interconnected power system, which has the characteristics of chaotic oscillation. For a long time, the research on the power fluctuation of tie-lines has mainly focused on the mechanism and suppression met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王安斯孙华东汤涌林伟芳易俊
Owner CHINA ELECTRIC POWER RES INST
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