Method and device for fault ride-through control at sending end of lcc-mmc power transmission system
A technology of fault ride-through and power transmission system, applied in power transmission AC network, AC network voltage adjustment, reactive power compensation, etc.
Active Publication Date: 2021-11-05
CHINA ELECTRIC POWER RES INST +1
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[0006] The invention provides a fault ride-through control method and device at the sending end of an LCC-MMC power transmission system to overcome the problem of insufficient AC fault ride-through capability at the sending end of the current LCC-MMC hybrid direct current transmission system
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[0063] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0064] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a sending-end fault ride-through control method and device of an LCC-MMC power transmission system. The fault ride-through control method at the sending end of the LCC-MMC power transmission system includes: when it is determined that an AC fault occurs at the sending end of the power transmission system, the MMC at the receiving end generates a fault ride-through control strategy according to the degree of the AC fault, and the fault ride-through control strategy includes adding at least one control link; wherein, the receiving end MMC has been configured with a constant voltage control link; the input of the constant voltage control link includes: the DC voltage reference value receiving end MMC executes the constant voltage control link and at least one additional control link to Make the DC voltage drop following the DC voltage at the LCC sending end. The fault ride-through control method at the sending end realizes the ride-through capability of the transmission system when faults of different degrees occur on the AC side of the sending end.
Description
technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a fault ride-through control method and device at a sending end of an LCC-MMC power transmission system. Background technique [0002] Conventional DC transmission has the advantages of low cost, low loss, large transmission capacity, and unlimited transmission distance. However, there are also problems such as commutation failure at the receiving end, strong dependence on the AC system, and large reactive power consumption during operation. On the other hand, the location of the DC receiving end is often relatively concentrated; the failure of the AC system at the sending end may cause simultaneous commutation failures of multiple converter stations at the receiving end, resulting in the blockage of multiple converter stations, resulting in interruption of transmission power, which seriously threatens the power grid stable operation. [0003] Flexible DC tra...
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IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 陈争光郝亮亮詹清清王兴国杜丁香郭雅蓉曹虹王书扬戴飞扬蔡文瑞程琪
Owner CHINA ELECTRIC POWER RES INST