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Modulation strategy for modular multilevel transducer

A modular multi-level converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as increasing the workload of the control system, and achieve software and hardware savings Resources, easy to adjust, easy to achieve the effect of engineering

Inactive Publication Date: 2013-08-14
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since each phase-shifted carrier needs to be generated separately and needs to be synchronized with each other, the workload of the control system will be increased when the carrier phase-shifted pulse width modulation strategy is adopted

Method used

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  • Modulation strategy for modular multilevel transducer
  • Modulation strategy for modular multilevel transducer
  • Modulation strategy for modular multilevel transducer

Examples

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Embodiment Construction

[0010] A modulation strategy for a modular multilevel converter is characterized in that: based on a carrier stacking method, the switching state of each sub-module is determined in combination with the current direction of each bridge arm and the sequence of the capacitor voltage of the sub-module.

[0011] Below in conjunction with accompanying drawing, the present invention will be further described:

[0012] figure 1 It is the main circuit topology of a modular multilevel converter, each phase is composed of an upper bridge arm, a lower bridge arm and a series reactor L, and the upper bridge arm includes N submodules (SM u1 -SM uN ), the lower bridge arm includes N submodules (SM d1 -SM dN ). All sub-modules have the same circuit structure, such as figure 2 shown.

[0013] Each phase of the modular multilevel converter is composed of 2N sub-modules with the same internal circuit, and the circuit structure of the sub-modules is as follows: figure 2 shown. VT1 and ...

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Abstract

The invention relates to a modulation strategy for a modular multilevel transducer. The modulation strategy is characterized in that the switching statuses of submodules are determined on the basis of a carrier disposition method in combination with the current directions of bridge arms and the sequence of capacitor voltage of the submodules. The invention has the benefits as follows: each phase only needs one modulating wave and N carrier waves (N is the number of the submodules of the upper or lower bridge arm of each phase of the modular multilevel transducer), the modular multilevel transducer is enabled to output N+1 levels without the need of a carrier phase-shifting, the precision of a control algorithm is high, engineering realization is facilitated, and software and hardware resources are saved; that N submodules are invested in each phase can be guaranteed at any time, and voltage balance control of capacitor voltage of the submodules can be realized without the need of closed-loop control; and meanwhile, the voltage and power classes of the modular multilevel transducer are convenient to adjust, without limitation of level number.

Description

technical field [0001] The invention relates to modulation technology in the field of multilevel power electronic converters, in particular to a carrier pulse width modulation strategy of modular multilevel converters. Background technique [0002] In the field of high voltage and high power, multilevel power electronic converters have been more and more widely used due to their unique advantages. Modular multilevel converter is a new type of voltage source converter, which adopts a strict modular design structure, which reduces the production cost in mass production; through the series connection of sub-modules, the voltage level and power level of the converter Easy to expand; the multi-level output form of the converter reduces the harmonic content and total distortion rate of the output voltage, thereby reducing or even eliminating the large-capacity AC filter; each bridge arm sub-module does not need to be turned on at the same time, reducing the The change rate of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835H02M7/53871H02M7/5395
Inventor 伍小杰公铮戴鹏梁改革耿乙文郭全军周娟方蒽赵霞戴华夏宗晓刘广胜
Owner CHINA UNIV OF MINING & TECH
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