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Practical estimation method for background harmonic impedance of AC power grid

A technology of background harmonic impedance and AC power grid, which is applied in the field of power transmission and distribution, and can solve the problems of inability to obtain the change of voltage or current phase itself, and difficulty in measuring and estimating harmonic impedance.

Active Publication Date: 2019-11-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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Problems solved by technology

The above methods all need to obtain the amplitude and phase information of data such as voltage and current. The power quality test and analysis instruments used in actual engineering tests usually can only obtain the phase difference between voltage and current, that is, the power factor, and cannot obtain the voltage or current at the same time. The change of its own phase before and after the change of working conditions brings certain difficulties to the measurement and estimation of harmonic impedance in actual engineering

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  • Practical estimation method for background harmonic impedance of AC power grid
  • Practical estimation method for background harmonic impedance of AC power grid
  • Practical estimation method for background harmonic impedance of AC power grid

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited by the examples.

[0052] This embodiment is a practical method for estimating the background harmonic impedance of an AC grid, which includes the following steps:

[0053] Step 1: Use the power quality test and analysis instrument to detect and obtain the h-order harmonic voltage of the AC bus bar of the converter station Amplitude U pcch , the hth order harmonic current at the outlet of the converter transformer The magnitude of I ch and and phase angle between And calculate the h order harmonic interactive permeation admittance Y h , as shown in formula (1).

[0054]

[0055] Step 2: Based on the AC busbar of the UHV converter station, establish an h-order harmonic analysis equivalent circuit to obtain the h-order harmonic voltage of the grid background, the h-order harmonic voltage of ...

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Abstract

The invention discloses a practical estimation method for background harmonic impedance of an AC power grid and provides the practical estimation method based on different running working conditions of a convertor station for the background harmonic impedance of the AC power grid. Aiming at real-measurement data types which can be acquired, the harmonic impedance estimation can be obtained only byknowing background harmonic voltage amplitude and current amplitude of the power grid and phase difference between the voltage amplitude and the current amplitude, and background harmonic impedance estimation of the AC power grid is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, in particular to a practical estimation method for the background harmonic impedance of an AC power grid. Background technique [0002] The acquisition of the background harmonic impedance of the AC grid in the UHV converter station is the basis for carrying out the corresponding power quality research. Filter design and so on are of great significance. [0003] The background harmonic impedance characteristics of the AC grid are relatively complex. Due to the complexity of the grid structure and the uncertainty of the harmonic model and harmonic parameters of the components, it is difficult to accurately estimate the harmonic impedance of the AC grid through the model equivalent method. Therefore, it is a practical method to estimate the background harmonic impedance of the AC power grid based on the measured data. Scholars at home and abroad have done a lot of rese...

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Application Information

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IPC IPC(8): G01R31/00G01R19/04G01R21/00G01R25/00H02J3/01
CPCG01R31/00G01R19/04G01R21/006G01R25/00H02J3/01Y02E40/40
Inventor 吕文韬王朝亮谢海葳徐群伟沈忱陈峰马智泉李培查蕾胡谆黄晓明吴俊黄弘扬楼伯良
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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