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Multi-level converter based on asymmetrical dual sub-modules and half-bridge sub-modules

A technology of multi-level converters and half-bridge sub-modules, which is applied in the direction of power transmission AC network, output power conversion device, conversion of AC power input to DC power output, etc., and can solve problems such as high price and immature technology , to achieve the effect of DC fault self-healing

Inactive Publication Date: 2017-08-01
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the current high-voltage DC circuit breaker is expensive and the technology is not yet mature.

Method used

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  • Multi-level converter based on asymmetrical dual sub-modules and half-bridge sub-modules
  • Multi-level converter based on asymmetrical dual sub-modules and half-bridge sub-modules
  • Multi-level converter based on asymmetrical dual sub-modules and half-bridge sub-modules

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0034] see first figure 1 , figure 1 It is a topological diagram of the multilevel converter based on the asymmetric twin sub-module and the half-bridge sub-module of the present invention. figure 2 It is the fault current path diagram of the asymmetric twin sub-module, as shown in the figure, the present invention is based on the multilevel converter of the asymmetric twin sub-module and the half-bridge sub-module, and constitutes a multi-level converter including the same three-phase structure, each Each phase is composed of an upper bridge arm and a lower bridge arm, and each of the upper bridge arm and the lower bridge arm is composed of i half-bridge sub-modules HSM1~HSMi and N-i asymmetrical twin sub-modules SMi+1~SMN connected in series, so The free end of the fir...

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Abstract

The invention discloses a multi-level converter based on asymmetrical dual sub-modules and half-bridge sub-modules. The multi-level converter comprises three phases of the multi-level converter in the same structure; each phase of the multi-level converter is composed of an upper bridge arm and a lower bridge arm; each of the upper bridge arm and the lower bridge arm is formed by serially connecting i half-bridge sub-modules and (N-i) asymmetrical dual sub-modules; the free end of the first sub-module of each upper bridge arm is connected with the positive pole of a direct-current bus of the multi-level converter; the free end of the N-th sub-module of each lower bridge arm is connected with the negative pole of the direct-current bus of the multi-level converter; and the free end of the N-th dual sub-module of each upper bridge arm is connected with the free end of the first sub-module of each lower bridge arm through an alternating current line. According to the multi-level converter, failure current on the direct current side of the multi-level converter can be automatically blocked, and failure self-recovery on the direct current side of the multi-level converter is realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multilevel converter based on an asymmetric twin sub-module and a half-bridge sub-module. Background technique [0002] Due to the lack of high-voltage DC circuit breaker technology, short-circuit faults on the DC side are an important problem faced by flexible HVDC transmission, which seriously affects the development of flexible HVDC transmission technology. In the flexible high-voltage DC transmission system using modular multi-level converter (modular multi-lever coNverter, multi-level converter) technology, in the case of a short-circuit fault on the DC side, the sub- The module has freewheeling capability. After the switching tube is blocked, the freewheeling diode provides a path for the AC system to feed the fault current to the DC fault point, and a three-phase virtual short occurs on the AC system side. There are currently three methods for dealing with DC ...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M1/32H02J3/36
CPCH02J3/36H02M1/32H02M7/483H02M1/325H02M7/4835Y02E60/60
Inventor 李国杰朱明琳杭丽君江秀臣
Owner SHANGHAI JIAO TONG UNIV
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