Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter

The submodule (SM) capacitor voltage ripple and the root mean square (RMS) of the arm current are related to the costs and losses of the modular multilevel converter (MMC). The optimization issues have received great attention. The second-order circulating current control and third-order harmonic vo...

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Bibliographic Details
Published in:IEEE access Vol. 8; pp. 94318 - 94329
Main Authors: Lin, Lei, Li, Ang, Xu, Chen, Wang, Yifan
Format: Journal Article
Language:English
Published: Piscataway IEEE 2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Capacitors
circulating current control
Converters
Current control
Electric potential
genetic algorithm
Genetic algorithms
Harmonic analysis
Modular multilevel converter
Modulation
multi-objective optimization
Multiple objective analysis
Optimization
Ripples
third-order harmonic voltage injection
Voltage
Voltage control
ISSN:2169-3536, 2169-3536
Online Access:Get full text
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Summary:The submodule (SM) capacitor voltage ripple and the root mean square (RMS) of the arm current are related to the costs and losses of the modular multilevel converter (MMC). The optimization issues have received great attention. The second-order circulating current control and third-order harmonic voltage injection are two conventional optimization methods, but the existing research neglects their coupling effects. In this paper, these two methods are comprehensively investigated and coordinately combined. First, the various performances of MMC under multiple injections are characterized. Then, a multi-objective optimization model considering the output capability of arm voltage and the energy balance of capacitors, is proposed to reduce the SM capacitor voltage ripple and the RMS of the arm current. The amplitudes and phases of the injected second- and third-order harmonic voltages are designed coordinately by genetic algorithm. The simulation and experimental results have validated the effectiveness and feasibility of the proposed method.
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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2995293