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A Modulation Method of Modular Multilevel Converter Based on Immune Genetic Algorithm

A modular multi-level, immune genetic algorithm technology, applied in the direction of genetic law, irreversible DC power input conversion to AC power output, genetic model, etc., to achieve the effect of easy implementation, optimization of modulation strategy, and simple calculation

Active Publication Date: 2017-10-24
WUHAN UNIV
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Problems solved by technology

[0004] Aiming at the optimization space still existing in existing modulation strategies, the present invention proposes a modulation method for modular multilevel converters based on immune genetic algorithm

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  • A Modulation Method of Modular Multilevel Converter Based on Immune Genetic Algorithm
  • A Modulation Method of Modular Multilevel Converter Based on Immune Genetic Algorithm
  • A Modulation Method of Modular Multilevel Converter Based on Immune Genetic Algorithm

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Embodiment Construction

[0053] The technical solutions of the present invention will be further specifically described below in conjunction with the accompanying drawings and embodiments.

[0054] The technical solution of the present invention is a modulation strategy of a modular multilevel converter based on immune genetic algorithm, with figure 1 It is a topology diagram of a modular multilevel converter, which has a three-phase structure of A, B, and C. Each phase is divided into an upper half-bridge arm and a lower half-bridge arm, and the upper and lower half-bridge arms are composed of n sub-modules SM1, SM2...SMn and an inductor L 1 Composed in series, i a i b i c is the output current of A, B, and C phases, i Ha and i Laare the bridge arm currents of the upper and lower half bridge arms of phase A respectively, i Hb and i Lb are the bridge arm currents of the upper and lower half bridge arms of phase B respectively, i Hc and i Lc are the bridge arm currents of the upper and lower h...

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Abstract

The present invention relates to a modularization multi-level converter modulation method based on an immune genetic algorithm, research on the optimizing control problems of a modularization multi-level converter is carried out, and an optimizing target is to output an optimal current waveform of the modularization multi-level converter. The method is characterized by: with combination of structural characteristics and output properties of the modularization multi-level converter, using the number of sub-modules invested into a bridge arm in each phase to demonstrate working condition; carrying out optimization on the working condition of the modularization multi-level converter; and through an encoding operation, vaccine injecting, affinity calculation, concentration calculation, immunity selection, an interlace operation, a mutation operation, and an inversion operation, carrying out multiple iteration convergence to obtain an optimized output voltage step wave of the modularization multi-level converter. According to the method disclosed by the present invention, through the immune genetic algorithm, a modulation strategy to the modularization multi-level converter is optimized, and the method has advantages of simple calculation, fast convergence speed, and easy implementation.

Description

technical field [0001] The invention relates to the technical field of voltage source inverter digital control, in particular to a modulation method of a modular multilevel converter based on immune genetic algorithm. Background technique [0002] In recent years, the high-voltage direct current transmission system (VSC-HVDC) based on the voltage source converter has received more and more attention and development. It has many advantages in long-distance power transmission, low line cost, and small active and reactive power losses. , there is no stability problem, asynchronous networking can be realized, and flexible control of power can be realized. With the continuous growth of the world's energy demand and the continuous deterioration of the energy situation, more and more attention has been paid to the power generation of clean energy such as wind energy and solar energy. And VSC-HVDC can realize the grid connection of these decentralized new energy discharges far away...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/49G06N3/12
CPCG06N3/126H02M7/49
Inventor 袁佳歆薛钢陈柏超田翠华杨雨桐
Owner WUHAN UNIV
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