Current control-based high-frequency oscillation suppression method and system for flexible direct-current power transmission system
A flexible DC and power transmission system technology, applied in power transmission AC network, reducing/preventing power oscillation, circuit devices, etc., can solve the problem that high-frequency oscillation cannot be completely suppressed.
Active Publication Date: 2020-09-15
CHINA SOUTHERN POWER GRID COMPANY +1
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[0004]Aiming at the defects of the prior art, the purpose of the present invention is to propose a method for suppressing high-frequency oscillations of flexible direct current transmission systems based on current control. Under the condition of operating cost, it solves the working condition that the existing technology cannot completely suppress the high-frequency oscillation
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[0033] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the embodiments described here are only used to explain the present invention, not to limit the present invention. After reading the present invention, modifications to various equivalent forms of the present invention by those skilled in the art fall within the scope defined by the appended claims of the present application.
[0034] The flexible DC transmission system is divided into a voltage loop and a current loop. When the high-frequency oscillation occurs in the flexible DC transmission system, there are high-frequency components in the two loops and they are coupled with each other. To suppress high-frequency oscillations, it is necessary to reduce the high-frequency componen...
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The invention relates to a current control-based flexible direct-current power transmission system high-frequency oscillation suppression method and system. The method comprises two stages of suppression, wherein the first-stage suppression is that a low-pass filter is additionally arranged at a terminal voltage feed-forward end of a fundamental frequency current controller so as to reduce high-frequency components of a voltage loop, and the second-stage suppression is an effective suppression measure provided for a working condition which cannot be solved by the first-stage suppression. According to the method, a low-pass filter is additionally arranged in a proportional element of a PI controller, the function is matched with first-stage suppression, and high-frequency components of voltage in the controller and PI control proportional element current are filtered, so that the purpose of suppressing high-frequency oscillation is achieved; and extra filtering cost does not need to beincreased, most of high-frequency oscillation working conditions can be solved, and suppression of high-frequency oscillation can be achieved.
Description
technical field [0001] The invention belongs to a method and system for suppressing high frequency oscillation of a flexible direct current transmission system in the field of voltage converters, and more specifically relates to a method and system for suppressing high frequency oscillation of a flexible direct current transmission system based on current control. Background technique [0002] Modular Multilevel Converter (MMC), as a large-capacity flexible DC converter equipment, is used in new energy grid connection (Zhangbei four-terminal DC transmission project), regional grid asynchronous interconnection (Luxi back-to-back DC project) and long-distance power transmission (Kunliulong UHV three-terminal hybrid DC project) are playing an increasingly important role. The high-frequency oscillation problem of MMC grid-connected AC system has been paid more and more attention by experts, scholars and engineers at home and abroad in recent years. High-frequency oscillation pr...
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IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/24H02J3/36H02J2003/365Y02E60/60
Inventor 梅勇林磊谢惠藩王一帆朱建行刘洪涛
Owner CHINA SOUTHERN POWER GRID COMPANY