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Multi-port modular multilevel converter for multi-end flexible direct-current transmission application

A modular multi-level, DC power transmission technology, applied in the direction of converting irreversible DC power input into AC power output, can solve the problems of high volume and cost of converters, multi-power devices and sub-module capacitors, etc., to improve power Density, the effect of reducing the overall loss

Active Publication Date: 2016-12-21
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its combined converter composed of series-parallel technology of converter units requires a large number of power devices and sub-module capacitors, which makes the converter volume and cost higher

Method used

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  • Multi-port modular multilevel converter for multi-end flexible direct-current transmission application
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  • Multi-port modular multilevel converter for multi-end flexible direct-current transmission application

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] Such as figure 1 As shown, a multi-port modular multi-level converter for multi-terminal flexible DC transmission applications, the multi-port modular multi-level converter is composed of (2n+1) cascaded converters, each stage The cascaded converter consists of three bridge arms, which are connected in a star shape through a common point, and each bridge arm is composed of N sub-modules connected in series with the corresponding bridge arm impedance.

[0025] In one embodiment, the specifi...

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Abstract

The present invention provides a multi-port modular multilevel converter for multi-end flexible direct-current transmission application. The multi-port modular multilevel converter is composed of (2n+1) cascaded converters; each cascaded converter is composed of three bridge arms; N sub-modules and corresponding bridge arm impedors are connected in series to form each bridge arm; according to the modular multilevel converter (MMC), the (2n+1) cascaded converters altogether form (2n+1) neutral points; and a direct-current transmission line positive pole bus-bar is led out from the neutral point of the cascaded converter (0), and 2n negative pole direct-current transmission lines are led out from the neutral points of the other 2n cascaded converters, so that 2n direct-current transmission lines can be formed. According to the multi-port modular multilevel converter of the invention, the bridge arms can be multiplexed, so that the total number of power devices can be decreased, loss and the total number of capacitors can be reduced; and under a condition that a high-voltage direct-current circuit breaker is not adopted, the blocking of any malfunctioned line can be realized through the direct-current fault blocking ability of the converter with normal operation of the other power transmission lines not affected.

Description

technical field [0001] The invention relates to the technical fields of flexible direct current transmission and power electronics in a power system, and in particular relates to a multi-port modular multilevel converter for multi-terminal flexible direct current transmission applications. Background technique [0002] Modular multilevel converter (MMC) is widely used in the field of flexible DC transmission. It is a power electronic converter suitable for high-voltage and high-power applications. It has strong scalability and high reliability. The voltage stress of the power switch in the module is small, it has more levels, and the output power quality is higher. [0003] MMC can be well applied in point-to-point MMC-HVDC occasions, but when it is extended to multi-terminal flexible DC transmission occasions, due to the high cost of high-voltage DC circuit breakers and immature technology, it is necessary to consider the DC fault blocking capability of the converter itself...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49
CPCH02M7/49
Inventor 蔡旭董鹏张建文吕敬
Owner SHANGHAI JIAO TONG UNIV
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