N+1 hybrid-modularization multilevel converter topology structure and control strategy thereof

A modular multi-level, topological structure technology, applied in high-efficiency power electronic conversion, AC power input conversion to DC power output, electrical components, etc., can solve the problem of reducing MMC output voltage quality, output waveform distortion, and increasing hardware costs, etc. question

Active Publication Date: 2017-12-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to the topological structure of the MMC, with the increase of parallel output modules, the quality of the output waveform is higher, closer to a sine wave, but when there are more sub-modules in the MMC, the hardware cost will increase, and when the number of sub-modules in the MMC When less, its output waveform will be distorted, reducing the output voltage quality of MMC

Method used

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  • N+1 hybrid-modularization multilevel converter topology structure and control strategy thereof
  • N+1 hybrid-modularization multilevel converter topology structure and control strategy thereof
  • N+1 hybrid-modularization multilevel converter topology structure and control strategy thereof

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Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Embodiment: A simulation model is used to verify the correctness and effectiveness of the topology and the control strategy.

[0039] Build an open-loop simulation model of a single-phase n+1 hybrid MMC converter in Matlab / Simulink software, and its equivalent schematic diagram is as follows figure 2 shown. Two half-bridge sub-modules and one full-bridge sub-module are connected in series on a single bridge arm. The output waveform of traditional MMC is 3 levels, and its power quality is very poor, while the output waveform of n+1 hybrid MMC is 7 levels, which improves the power quality better.

[0040] The hybrid MMC is used to supply power to the inductive load, and its main parameters are shown in Table 1 below.

[0041] Table 1

[0042]

[0043] In the simulation, in order to simulate the start-up pre-charging process of the hybrid MMC converter sub-module, the DC side voltage increases slowly from 0, when the DC side voltage reaches half of the rated value o...

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Abstract

The invention discloses an n+1 hybrid-modularization multilevel converter topology structure and a control strategy thereof and belongs to the power electronics and distributed power generation field. The topology structure is formed by adding one all-bridge submodule in each phase of upper and lower bridge arms based on a modularization multilevel converter (MMC) of traditional n half-bridge submodules. A capacitor voltage of the all-bridge submodule is one half of the voltage of each half-bridge submodule so as to realize that an output voltage level number is increased to 2n+3 from original n+1. In the invention, a submodule output level number is increased, output voltage quality of the MMC converter is improved, and according to the topology structure, a control strategy is provided; and a hybrid modulation mode and a capacitance precharging mode are adopted, and certain validity and feasibility are possessed.

Description

technical field [0001] The invention relates to an n+1 hybrid modular multilevel converter topology and its control strategy, belonging to the field of power electronics and distributed power generation. Background technique [0002] With the development of power electronics technology, flexible DC transmission based on voltage source converters has received more and more attention. The essential idea of ​​the modular multilevel converter (MMC) is to reduce the voltage stress on each sub-module by cascading multiple sub-modules. There are n sub-modules in the upper and lower bridge arms of one phase, which can output n+1 levels. During operation, half of the sub-modules in each phase are always in the on state, and half of the sub-modules are in the cut-off state. Due to its modular and cascaded structure features, MMC has the advantage of easy expansion and can be flexibly applied to industrial sites. At present, research on MMC mainly focuses on its topology, sub-module ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0054Y02B70/10
Inventor 郑建勇缪惠宇陈虹妃顾盼盼杨赟
Owner SOUTHEAST UNIV
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