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A Modular Multilevel Converter Topology

A modular multi-level, inverter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of large voltage fluctuation amplitude, large number of required modules, Large capacitor capacity and other problems, to achieve the effect of reducing voltage fluctuation, improving power density, and reducing capacity

Active Publication Date: 2016-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to solve the problems of large capacitor voltage fluctuation amplitude, large capacitor capacity, low power density, and large number of required modules in the existing traditional modular multi-level converter, thereby providing a new modular multi-level converter. Flat Converter Topology

Method used

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  • A Modular Multilevel Converter Topology
  • A Modular Multilevel Converter Topology
  • A Modular Multilevel Converter Topology

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Experimental program
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specific Embodiment approach 1

[0061] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. A novel modular multilevel converter topology, which includes three top sub-modules M1, three bottom terminal modules M5, three middle sub-modules M3, 3n upper bridge arm sub-modules M2, 3n lower bridge arm sub-modules M4, first reactor 1, second reactor 2, third reactor 3, fourth reactor 4, fifth reactor 5 and sixth reactor 6, n is a positive integer;

[0062] The three top sub-modules M1 are connected in parallel to form the top module group 7; the three bottom terminal modules M5 are connected in parallel to form the bottom module group 9; the three middle sub-modules M3 form the middle module group 8; with output terminals a, b and c respectively;

[0063] A top sub-module M1 is sequentially connected in series with n upper bridge arm sub-modules M2 to form the upper bridge arm of the first phase of the converter;

[0064] A bottom terminal module M5 is sequentially connected in series with n lower bridge arm sub...

specific Embodiment approach 2

[0078] Embodiment 2. The difference between this embodiment and the new modular multilevel converter topology described in Embodiment 1 is that the specific circuit structure of the top module group 7 is: the top of the first phase circuit The sub-module M1 includes No. 1 controllable switch S11 and No. 2 controllable switch S12; the top sub-module M1 in the second phase circuit includes No. 3 controllable switch S13 and No. 4 controllable switch S14; the top sub-module M1 in the third phase circuit The sub-module M1 includes No. 5 controllable switch S15 and No. 6 controllable switch S16;

[0079] The collector of the No. 1 controllable switch S11, the collector of the No. 3 controllable switch S13 and the collector of the No. 5 controllable switch S15 are simultaneously connected to the positive pole P of the DC power supply;

[0080] The emitter of the No. 2 controllable switch S12, the emitter of the No. 4 controllable switch S14 and the emitter of the No. 6 controllable s...

specific Embodiment approach 3

[0084] Embodiment 3. The difference between this embodiment and the new modular multilevel converter topology described in Embodiment 1 is that the specific circuit structure of the bottom module group 9 is: the first phase circuit The bottom terminal module M5 includes No. 7 controllable switch S51 and No. 8 controllable switch S52; the top sub-module M5 in the second phase circuit includes No. 9 controllable switch S53 and No. 10 controllable switch S54; The top sub-module M1 includes a No. 11 controllable switch S55 and a No. 12 controllable switch S56;

[0085] The collector of the No. 7 controllable switch S51, the collector of the No. 9 controllable switch S53 and the collector of the No. 11 controllable switch S55 are connected;

[0086] The emitter of the No. 8 controllable switch S52, the emitter of the No. 10 controllable switch S54 and the emitter of the No. 12 controllable switch S56 are connected to the negative pole N of the DC power supply at the same time;

[...

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Abstract

A novel modular multilevel converter topology relates to a modular multilevel converter. The invention aims to solve the problems of large capacitor voltage fluctuation amplitude, large capacitor capacity, low power density and large number of required modules in the existing traditional modularized multilevel converter. By modifying the connection mode of the upper and lower power sub-modules of the traditional modular multilevel converter and adding an intermediate power module, the present invention retains the advantages of the traditional modular multilevel converter and overcomes some of the shortcomings of the traditional topology ;When outputting the same number of levels, the new topology requires fewer modules, which helps to reduce costs; when the load is the same, the capacitor voltage fluctuation of the new topology is smaller, which helps to reduce the number of modular multilevel converters The capacity of the capacitor reduces the cost and reduces the loss. The invention is suitable for high-voltage and high-power electric energy conversion occasions.

Description

technical field [0001] The invention relates to a modular multilevel converter. Background technique [0002] Modular multilevel converter (MMC), as a new type of high-voltage and high-power electric energy conversion technology, has increasingly attracted the attention of researchers from various countries. Compared with traditional two-level and three-level converters, modular multilevel circulators have the following obvious advantages: [0003] (1) Reduced manufacturing difficulty: no valve based on IGBT series connection is required, which reduces the manufacturing technology threshold; [0004] (2) Reduced loss: the switching frequency of the modular multi-level converter is doubled, and the loss of the converter is greatly reduced; [0005] (3) Step voltage reduction: Since the step voltage of the modular multilevel converter is small, the step voltage and step current generated are small, so that the switch stress and electromagnetic interference are greatly reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/4835H02M1/0095
Inventor 徐殿国李彬彬张毅徐聃聃杨荣峰
Owner HARBIN INST OF TECH
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