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Multi-target selected harmonics suppression pulse width modulation method of modular multilevel converter

A modular multi-level, specific harmonic technology, applied in the field of power electronics, can solve the problems of uneven distribution of non-dominated solutions, slow convergence speed, high computational complexity, etc., and achieve simple implementation, low switching loss, and high optimization efficiency Effect

Active Publication Date: 2016-08-17
WENZHOU UNIVERSITY
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Problems solved by technology

However, the objective function used in the research attempts based on the MOPSO method reported recently is too simple, ignoring performance indicators such as DC voltage utilization, DC capacitor voltage balance, and system loss. There are also problems such as slow convergence speed, uneven distribution of non-dominated solutions, Defects such as high computational complexity

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  • Multi-target selected harmonics suppression pulse width modulation method of modular multilevel converter

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[0042] The present invention will be further described below in conjunction with the accompanying drawings, and the purpose and effect of the present invention will be more obvious.

[0043] figure 1 It is a schematic diagram of the principle of the multi-target specific harmonic suppression pulse width modulation method for the modular multi-level converter. Among them, V mr is the reference voltage, V l and I l Indicate the detected load voltage and load current respectively, and first pass the detected V through the fast Fourier transform module l Fourier transform is performed by interacting with V mr After the comparison, then through the PI controller module, and then according to the specific harmonic suppression target and modulation ratio M required by the actual project a and the set optimization parameter values, using the multi-objective adaptive extremum optimization solver to optimize the multi-objective optimization mathematical model for the specific harmo...

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Abstract

The invention discloses a multi-target selected harmonics suppression pulse width modulation method of a modular multilevel converter. The method includes: determining a target harmonics order and an upper suppression limit value of selected harmonics suppression of the modular multilevel converter according to actual engineering application requirements, establishing a multi-target optimization function and constraint conditions of selected harmonics suppression of the modular multilevel converter based on 1 / 4 cyclic symmetry through a Fourier transform algorithm, designing a multi-target adaptive extremal optimization solver to acquire a group of non-dominated switch angles, transmitting the switch angles to a pulse width modulation module of the modular multilevel converter, and detecting output voltage waves and corresponding total harmonic distortion of the modular multilevel converter through an oscilloscope. Multi-target selected harmonics suppression pulse width modulation effect of the modular multilevel converter meeting multi-performance index compromise optimization can be realized, the output voltage waves of the modular multilevel converter have more superior harmonic characteristics, corresponding total harmonic distortion is lower, and switching loss is lower.

Description

technical field [0001] The invention relates to a multilevel converter modulation technology in the technical field of power electronics, in particular to a multi-target specific harmonic suppression pulse width modulation method for a modular multilevel converter. Background technique [0002] In recent years, the rapid development of high-voltage direct current transmission, high-voltage frequency conversion speed regulation, high-power new energy power system, large-scale airborne traction, large-scale smelting, port ship shore power and other application fields in my country and developed countries in Europe and the United States has a great impact on high-performance and large-capacity power electronic devices. There is an urgent need, and multilevel converters have gradually become the preferred solution for high-voltage (3kV, 6kV, 10kV or even higher) applications in large-capacity power electronic systems. On the premise that the current power semiconductor manufactur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02M1/12H02M7/483H02M7/5395
CPCG06F30/39G06F2111/06H02M1/12H02M7/483H02M7/5395H02M1/0054Y02B70/10
Inventor 曾国强沈洁贝李理敏王环吴烈戴瑜兴陆康迪陈杰
Owner WENZHOU UNIVERSITY
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