Flexible DC power transmission system and oscillation suppression method thereof

A technology of power transmission system and flexible DC, applied in the field of data processing, can solve the problem of voltage source converter oscillation and instability suppression in flexible DC power transmission system, insufficient voltage source converter modeling, voltage source converter oscillation and instability mechanism unclear, etc.

Pending Publication Date: 2022-03-01
STATE GRID ZHEJIANG ELECTRIC POWER +1
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Problems solved by technology

[0004] In this regard, this application provides a flexible direct current transmission system and its oscillation suppression method to solve the problem of insufficient modeling of the voltage source converter of the flexible direct current transmission system under the condition of weak grid i

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  • Flexible DC power transmission system and oscillation suppression method thereof
  • Flexible DC power transmission system and oscillation suppression method thereof
  • Flexible DC power transmission system and oscillation suppression method thereof

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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] The embodiment of the present application provides an oscillation suppression method for a flexible direct current transmission system to solve the insufficient modeling of the voltage source converter of the flexible direct current transmission system under the condition of a weak grid in the existing related schemes, which leads to the oscillation and instability mechanism of the voltage source converter It is not clear, and it is impossible to suppres...

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Abstract

The invention provides a flexible direct-current power transmission system and an oscillation suppression method thereof. The method comprises the following steps: establishing a nonlinear model of a preset converter in the flexible direct-current power transmission system; the nonlinear model comprises a phase-locked loop model and a direct-current voltage outer loop model; then, based on the nonlinear model, feedback output power of the preset converter is obtained, the preset converter is controlled to output according to the feedback output power, oscillation suppression of the flexible direct-current transmission system is achieved, and the problem that in an existing related scheme, modeling of a voltage source converter of the flexible direct-current transmission system is insufficient under the weak power grid condition is solved; the oscillation and instability mechanism of the voltage source converter is not clear, and the oscillation and instability of the voltage source converter of the flexible direct current power transmission system cannot be suppressed.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a flexible direct current transmission system and an oscillation suppression method thereof. Background technique [0002] Flexible DC transmission technology is an emerging power transmission technology, which consists of a converter station and a DC transmission line. The traditional DC transmission system uses a phase-controlled converter (Line Commutated Converter, LCC). Although it has a large transmission capacity and safe operation, there are problems such as commutation failure, large reactive power consumption, and inability to operate on a weak grid. With the rapid development of the power electronics industry, the flexible DC transmission technology based on the voltage source converter (VSC) overcomes the above problems, and the flexible DC transmission technology based on the voltage-source converter (VSC) is not affected by the strong or weak grid , there i...

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Application Information

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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/36H02J3/241H02J2003/365H02J2203/20Y02E60/60
Inventor 李继红但扬清何英静王蕾孙飞飞许恩超吴莹武佳卉丁一凡杨黎陈晴悦王奕鑫孙锐鹏
Owner STATE GRID ZHEJIANG ELECTRIC POWER
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