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Method for judging harmonic instability of double-circuit parallel high-voltage direct-current power transmission system

A technology of high-voltage direct current transmission and judgment method, which is applied in the field of electrical information, and can solve the problems of incomplete integration of theoretical support, network topology parameters of double-circuit direct current line network, and harmonic instability.

Inactive Publication Date: 2014-11-12
SICHUAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Harmonic instability is also known as core saturation and harmonic instability. However, the existing method for judging harmonic instability of double-circuit parallel HVDC transmission systems does not include transformer core saturation parameters, which is not fully integrated with theoretical support, and does not consider dual The difference in topology parameters of the back-to-DC line network has certain errors in the judgment method, and the accuracy is not very high

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  • Method for judging harmonic instability of double-circuit parallel high-voltage direct-current power transmission system
  • Method for judging harmonic instability of double-circuit parallel high-voltage direct-current power transmission system
  • Method for judging harmonic instability of double-circuit parallel high-voltage direct-current power transmission system

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Embodiment

[0048] Such as figure 1 As shown, at time t, there are harmonic components on the DC 1 side, which are modulated to the AC side by the converter, and at time t+Δt, the harmonics are modulated from the AC side to the DC 1 and DC 2 sides, and this process is harmonic transfer a process;

[0049] Such as figure 2As shown, at the time t+2Δt, the harmonics of the DC 1 side and the DC 2 side are modulated to the AC side, and the harmonics of the AC side are the sum of the harmonics of the DC 1 side and the DC 2 side modulated to the AC side. At the time t+3Δt, Harmonics are transmitted from the AC side to the DC 1 side and DC 2 side, thus serving as the secondary process of harmonic transmission;

[0050] Such as image 3 As shown, the AC side system of the model is connected to the DC system by the converter through a series of filtering devices. The DC system is two parallel DC transmission lines with double circuits, and the two DC lines are also equipped with a series of fil...

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Abstract

The invention discloses a method for judging harmonic instability of a double-circuit parallel high-voltage direct-current power transmission system. The method is characterized in that the method is combined with a direct-current bias magnetic effect of a transformer, a direct-current bias magnetic coefficient is introduced to a derivation process, negative sequence impedance parameters of an alternating-current side are omitted, the size and the phase difference of double-circuit direct-current line impedance are considered, whether harmonic instability can happen to the system is judged only through positive sequence secondary impedance of the alternating-current side and fundamental frequency impedance of a direct-current side, and the new method for judging whether harmonic instability can happen to the double-circuit parallel high-voltage direct-current power transmission system is put forward.

Description

technical field [0001] The invention relates to a method for judging harmonic instability of a double-circuit parallel high-voltage direct current transmission system. Specifically, the invention uses the positive-sequence secondary impedance of the AC side and the fundamental frequency impedance of the DC side, and combines switching function theory, harmonic Instability mechanism to determine whether harmonic instability will occur in double-circuit parallel HVDC transmission system belongs to the field of electrical information. Background technique [0002] my country's geographical span is large, the distribution of primary energy is uneven, and energy is mainly concentrated in the western region, while energy consumption is concentrated in the eastern region, so a large-scale power grid is required for power transmission. The transmission distance of traditional AC transmission is difficult to exceed 500-600km, and one of the successful applications of high-voltage dir...

Claims

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Application Information

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IPC IPC(8): H02J3/36G01R31/08
CPCY02E60/60
Inventor 刘天琪丁媛媛李兴源马静陈实王峰李保宏凡航
Owner SICHUAN UNIV
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