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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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
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Abstract	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.
AbstractList	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.
Author	Lin, Lei Li, Ang Wang, Yifan Xu, Chen
Author_xml	– sequence: 1 givenname: Lei surname: Lin fullname: Lin, Lei organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China – sequence: 2 givenname: Ang surname: Li fullname: Li, Ang organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China – sequence: 3 givenname: Chen orcidid: 0000-0002-9100-9064 surname: Xu fullname: Xu, Chen email: xuchen_hust@sina.com organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China – sequence: 4 givenname: Yifan surname: Wang fullname: Wang, Yifan organization: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China
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References	ref35 ref13 ref34 ref12 tu (ref9) 2011; 26 ref15 ref36 ref14 ref31 ref30 ref33 ref11 ref10 ref2 ref1 ref17 ref16 ref19 zitzler (ref32) 1998 ref18 ref24 ref23 ref26 ref25 ref20 ref22 ref21 ref28 ref29 ref8 ref7 ref4 ref3 ref6 ref5 osyczka (ref27) 1984
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SubjectTerms	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
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Title	Multi-Objective Genetic Algorithm Based Coordinated Second- and Third-Order Harmonic Voltage Injection in Modular Multilevel Converter
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