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Method for suppressing circulating current in modular multilevel converter for high voltage direct-current transmission

A modular multi-level, high-voltage DC technology, applied in the direction of AC power input conversion to AC power output, power transmission AC network, high-efficiency power electronic conversion, etc., can solve the pulsating current of DC lines that do not include and have poor transient characteristics And other issues

Active Publication Date: 2014-08-13
KOREA ELECTROTECH RES INST
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  • Claims
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Problems solved by technology

In addition, this method does not include the concept of removing the positive sequence component of the circulation
Also, while the steady-state characteristics are good, the transient characteristics are poor and pulsating currents appear in the DC link

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  • Method for suppressing circulating current in modular multilevel converter for high voltage direct-current transmission
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  • Method for suppressing circulating current in modular multilevel converter for high voltage direct-current transmission

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Embodiment Construction

[0094] Hereinafter, reference will be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with exemplary embodiments, it will be understood that these descriptions are not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.

[0095] The above and other features of the invention are discussed below.

[0096] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

[0097] The present invention relates to a meth...

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Abstract

Provided is a method for suppressing a circulating current in a modular multi-level converter for a high voltage direction-current (HVDC) transmission system. The HVDC transmission system converts an alternating current (AC) into a direct current (DC) and vice versa, transmits energy using a DC cable, and including a modular multilevel converter generating a high voltage source by stacking a plurality of sub-modules in series. In the circulating current suppression method, a circulating current (idiffj; j=a,b,c) of a,b,c phase in an abc 3-phase stationary reference frame, a DC current (idc) flowing in a DC cable, a current reference value (i*dc) of a DC component that needs to flow in the DC cable are inputted. The circulating current (idiffj) of the a,b,c phase is controlled to become zero. A compensation value (V*diffj) for suppressing a harmonic component of the circulating current is outputted.

Description

technical field [0001] The invention relates to a method for suppressing circulating currents in a modular multilevel converter for high voltage direct current transmission. More specifically, the present invention relates to a method of suppressing circulating current in a modular multilevel converter for high-voltage direct current transmission, which can further improve the current in the DC line terminal while further improving the circulating current suppression characteristic flow. Background technique [0002] In general, high voltage direct current (HVDC) transmission has advantages over high voltage alternating current (HVAC) transmission such as long-distance transmission, asynchronous system connection, use of submarine cables, and ability to control power, so applications for HVDC are steadily increasing. [0003] For example, HVDC systems are known to have lower energy delivery costs than HVAC where there is an ocean between the production location and the ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M1/12H02M1/15H02J3/36H02M5/4585H02M7/483H02M2007/4835Y02E60/60Y02B70/10H02M7/4835
Inventor 朴正雨姜岱旭金钟贤俞东旭文智虞权晋秀金春成裵得佑
Owner KOREA ELECTROTECH RES INST
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