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Method and system for inhibiting residue pole ratio in overhead line frequency domain propagation matrix vector fitting process

A propagation matrix and vector fitting technique, which is applied in the field of residue-pole ratio in the suppression of overhead line frequency-domain propagation matrix-vector fitting process

Pending Publication Date: 2019-10-29
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0033] The present invention proposes a method for suppressing the residue-pole ratio in the frequency-domain propagation matrix vector fitting process of overhead lines to solve the problem of how to suppress the residue-pole ratio so as to improve the stability of the overhead line electromagnetic transient simulation time domain

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  • Method and system for inhibiting residue pole ratio in overhead line frequency domain propagation matrix vector fitting process
  • Method and system for inhibiting residue pole ratio in overhead line frequency domain propagation matrix vector fitting process
  • Method and system for inhibiting residue pole ratio in overhead line frequency domain propagation matrix vector fitting process

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[0103] It is known that the three-phase conductors of a 30km overhead line transmission line are arranged horizontally, and the height to the ground is 30m; the horizontal distance between two pairs is 26.56m; the equivalent radius corresponding to the split conductor 8×LGJ-500 / 35 is 0.435m; the conductivity of the conductor is about It is 2.4392×307S / m. The power frequency is 50Hz, the relative dielectric constant of the soil is 30, and the three-phase conductors are numbered 1, 2 and 3 from left to right.

[0104] The poles of the propagation function matrix H in the range of 0.5Hz-1MHz are shown in Table 1, and the amplitude-frequency response data and phase-frequency response data of the overhead line propagation function matrix H obtained after fitting are shown in Figure 4 and Figure 5 shown.

[0105] Table 1 The poles of the propagation function matrix H in the range of 0.5Hz-1MHz

[0106]

[0107]

[0108] Specifically, the process of suppressing the residu...

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Abstract

The invention discloses a method and a system for inhibiting a residue pole ratio in an overhead line frequency domain propagation matrix vector fitting process. The method comprises the following steps: for each element, when a corresponding initial residue pole ratio is greater than a first preset threshold, performing singular value decomposition on a coefficient matrix, and setting a singularvalue of a product of a maximum singular value in a first singular value matrix and a preset precision threshold to be zero to obtain a second singular value matrix; determining an updated coefficientmatrix by using the second singular value matrix, and determining a new residue vector by using a least square method; removing a pole with a value of 0; judging whether the ratio of the residue corresponding to each of the remaining poles to the pole is smaller than a first preset threshold value or not; if so, indicating that the suppression is successful, and determining a frequency domain propagation matrix for expressing each element in a rational mode by utilizing the residual poles and the corresponding residues so as to ensure the stability of time domain simulation; otherwise, indicating that the suppression fails, and carrying out recalculating.

Description

technical field [0001] The invention relates to the technical field of electric power system electromagnetic simulation, and more specifically, relates to a method and system for suppressing residue-to-pole ratios in the process of overhead line frequency-domain propagation matrix vector fitting. Background technique [0002] Overhead lines are important power transmission equipment, such as figure 1 shown. In the power system, except for electrical equipment and power plants, the rest are all power grids composed of transmission lines, so transmission lines play an irreplaceable role in the power system. The frequency range of the overvoltage caused by power equipment failure, lightning strike or improper operation is much larger than the frequency range of the normal operation of the system, and contains a large number of high-frequency components. Therefore, in the transient calculation, a traveling wave model is established for the overhead line. Traveling wave models...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06G06F2111/10G06F30/20
Inventor 陈绪江张星徐得超穆清郑伟杰徐翌征王峰刘敏王艺璇
Owner CHINA ELECTRIC POWER RES INST
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