One-way full-bridge modular multilevel converter based on IGCT and control method

A modular multi-level converter technology, applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., can solve problems such as poor capacity, large operating loss, and large number of power devices. problems, to achieve the effect of low economic cost and low loss

Pending Publication Date: 2021-10-22
CHINA THREE GORGES CORPORATION +1
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Problems solved by technology

However, the half-bridge modular multilevel converter based on IGCT does not have the function of self-clearing DC faults in the event of a DC short-circuit fault on the overhead line of the DC system, so the ability to resist DC short-circuit faults is poor
In addition, for the hybrid DC transmission system composed of grid-commutated converters and modular multi-level converters, when online power inversion is required, half-bridge modular multi-level converters ba

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  • One-way full-bridge modular multilevel converter based on IGCT and control method
  • One-way full-bridge modular multilevel converter based on IGCT and control method
  • One-way full-bridge modular multilevel converter based on IGCT and control method

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[0088] In order to make the purposes, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0089] The IGCT-based unidirectional full-bridge modular multilevel converter proposed by the present invention can be a three-phase circuit or a single-phase circuit. The three-phase circuit has a total of 6 bridge arms, and the single-phase circuit has a total of 4 bridge arms, wherein each bridge arm has n identical sub-modules. ...

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Abstract

The invention provides a one-way full-bridge modular multilevel converter based on IGCT and a control method. The multilevel converter comprises a plurality of bridge arms, each bridge arm comprises a plurality of same sub-modules; each sub-module comprises an IGCT one-way full-bridge module (1), a drive power source (2), a buffer circuit (3), a voltage clipping circuit (4), a DC capacitor (5), a balanced discharge circuit (6), a current acquisition circuit (8), and a submodule controller (9). The one-way full-bridge modular multilevel converter based on the IGCT realizes the functions of direct-current fault self-clearing, direct-current variable-voltage operation, power reversal and the like, has the advantages of low loss, economical efficiency and low cost, overcomes the defects of other structures, and can be widely applied to a flexible direct-current power transmission system or a hybrid direct-current power transmission system.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a unidirectional full-bridge modular multilevel converter based on an integrated gate commutated thyristor (IGCT) and a control method thereof. Background technique [0002] Flexible DC transmission has become the most potential new power transmission method at present, and has been applied in large-capacity transmission systems. [0003] Modular multilevel converter is the most mainstream topology used in flexible DC transmission at present. Most of the flexible direct current transmission projects that have been put into operation use conventional half-bridge modular multilevel converters based on insulated gate bipolar transistors (IGBTs), but such half-bridge modular multilevel converters are used in There are great difficulties in realizing DC fault clearance, DC variable voltage operation mode, and power inversion. At the same time, there are also dis...

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Application Information

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IPC IPC(8): H02M7/483H02M7/521
CPCH02M7/483H02M7/521
Inventor 赵彪唐博进曾嵘郭明珠余占清翟冬玲许超群宋强屈鲁
Owner CHINA THREE GORGES CORPORATION
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