Fault protection circuit and method for submodule of modular multilevel converter

A modular multi-level, fault-protection technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems affecting changes in bridge arm voltage and current

Active Publication Date: 2012-11-28
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the reaction time from the fault occurrence to the T2 pulse blockade is about 10us, and the closing time of K is about 10ms. Since the action tim

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  • Fault protection circuit and method for submodule of modular multilevel converter
  • Fault protection circuit and method for submodule of modular multilevel converter
  • Fault protection circuit and method for submodule of modular multilevel converter

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Embodiment Construction

[0041]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0042] see figure 2 It shows a schematic structural diagram of Embodiment 1 of a fault protection circuit for a modular multilevel converter provided by the present invention, including: a support capacitor C, a voltage equalizing resistor R, a first switching tube T1, a second switching tube T2, The first diode D1, the second diode D2, the ...

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Abstract

The invention provides a fault protection circuit for a submodule of a modular multilevel converter. When a second switch tube T2 is on, and a first switch tube T1 is off and is short circuited, a submodule controller 101 controls the second switch tube T2 to block the conduction between a pulse and a second thyristor D4, and sends an off signal to a by-pass switch at the same time. Due to the long action time of the by-pass switch K, the conduction of the second thyristor D4 can implement the rapid bypass of a fault submodule. According to the fault protection circuit and method for the submodule of the modular multilevel converter provided by the invention, when the second switch tube T2 is on, and the first switch tube T1 is short circuited, fault current can be prevented from expanding to a system effectively, so that the voltage stability at a direct current side is ensured and the requirements of the system on high reliability and safe operation are met.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a sub-module fault protection circuit and method of a modular multilevel converter. Background technique [0002] Flexible DC transmission technology is a new type of high-voltage DC transmission technology based on voltage source converters. With its no commutation failure problem, it can realize fast decoupling control of active and reactive power and the advantages of low harmonic content. It is more widely used in the fields of distributed generation grid connection, asynchronous interconnection of AC system, multi-terminal DC transmission and capacity expansion of urban distribution network. [0003] Modular multilevel converter, as one of the voltage source converter topologies to realize flexible DC transmission engineering, has received great attention in recent years. Its basic circuit unit is a sub-module, and the structural dia...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 敬华兵吴强龚芬唐剑钊邓明翟文杰
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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