A modular multilevel converter and method for clearing DC faults
A modular multi-level, DC fault technology, applied in the direction of converting AC power input to DC power output, power transmission AC network, electrical components, etc. The effect of improving the speed of DC fault handling and operation recovery
Active Publication Date: 2021-03-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
The converter itself does not have any control means, resulting in a short-circuit fault that has a huge impact on the DC system
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[0035] 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.
[0036] The purpose of the present invention is to provide a half-bridge modular multilevel converter and a DC fault clearing method to realize the control of the short-circuit current and improve the speed of fault processing and operation recovery.
[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying...
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The invention relates to a modular multilevel converter and a DC fault clearing method. The method is characterized in that a group of upper and lower bridge arms are added on the basis of a traditional half-bridge MMC (modular multilevel converter), and the DC fault can be cleared under the assistance of proper control, and comprises the steps: in a normal working state of the direct current side, the front M sub-modules of the upper bridge arm are in a cut-off state, and the rear M sub-modules are in an input state; when a short-circuit fault occurs at the direct current side, trigger pulsesof the front M sub-modules of the ARM-PLUS upper bridge arm and the rear M sub-modules of the lower bridge arm are blocked to work in a locked state; if the residual voltage of the direct current side is relatively high, the ARM-PLUS is controlled to work in a reverse Boost state; an isolation switch is added at a DC output side, and permanent faults can be eliminated; and after the short-circuitfault is eliminated, and when the short-circuit current reaches a zero value, waiting for ms is performed until short-circuit arc is completely extinguished, and the ARM-PLUS is recovered to a normalworking state. According to the ARM-PLUS topology provided by the invention, the principle is clear, the implementation method is simple, and the DC fault processing and operation recovery speed canbe significantly improved.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a modular multilevel converter and a method for clearing DC faults. Background technique [0002] With the proposal of power transmission requirements such as large-capacity long-distance power transmission, large-scale renewable energy grid connection, and island power supply, the flexible DC power transmission technology based on the half-bridge modular multilevel converter (MMC), With the advantages of small harmonic distortion and good expandability, it has become the focus of research at home and abroad. Compared with the two-terminal system, the multi-terminal HVDC (MTDC) system can realize multi-source power supply and multi-destination power receiving, which has better flexibility, economy and stability, and has broad application prospects. [0003] The DC network brought about by the development of HVDC transmission technology leads to the problem that the DC ...
Claims
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IPC IPC(8): H02M7/00H02J3/36H02H7/26
CPCH02H7/268H02J3/36H02M7/00Y02E60/60
Inventor 韩民晓周光阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)