电工技术学报  2016, Vol. 31 Issue (1): 119-127    DOI:
电力电子与电力传动 |
直流电压不均衡的级联H桥多电平变频器载波移相PWM调制策略的设计
蔡信健1-3,吴振兴3,孙乐4,王书秀3
1.强电磁工程与新技术国家重点实验室(华中科技大学) 武汉 430074
2.福建工程学院信息科学与工程学院 福州 350118
3.舰船综合电力技术国防科技重点实验室 武汉 430032
4.西安交通大学电气学院 西安 710049
Design for Phase-shifted Carrier Pulse Width Modulation of Cascaded H-bridge Multi-level Inverters with Non-equal DC Voltages
Cai Xinjian1-3,Wu Zhenxing3,Sun Le4,Wang Shuxiu2
1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China
2.College of Information Science and Engineering Fujian University of Technology Fuzhou 350118 China
3.National Key Laboratory for Vessel Integrated Power System Technology Wuhan 430032 China
4.School of Electrical Engineering Xi’an Jiaotong University Xi’an 710049 China
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摘要 对于级联H桥多电平变频器,单元独立直流电源的参数差异及故障等多种因素均会导致各单元的直流电压不均衡。单元直流电压不均衡时,传统载波移相(PSC)PWM调制策略无法消除电压的低频边带谐波,导致变频器输出的电能质量明显降低。对单元载波相位、直流电压与变频器输出电压谐波的关系进行了研究,提出了按照单元直流电压调整单元载波相位的策略。该调制策略能够消除变频器输出电压的低频边带谐波,提高电能质量,增强变频器的容错能力。仿真与样机实验结果验证了所提出的调制策略的效果。
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蔡信健
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王书秀
关键词 级联H桥多电平变频器单元直流电压不均衡载波移相PWM容错能力    
Abstract:In practice,many factors result in non-equal cell DC voltages of the cascaded H-bridge multilevel (CHBML) inverter,such as the differences amongthe DC sources of the H-bridge cells and the faults of the DC sources.The classical phase-shifted carrier (PSC) pulse width modulation (PWM) is unable to eliminate the low-frequency sideband-harmonics when the DC voltages of the cells are not equal.The quality of the output voltage degrades.In this paper,the relationship among the cell carrier-phases,the DC voltages,and the harmonics of the output voltage are analyzed.And then,a novel PSCPWM method,in which the carrier phases are regulated according to the different DC voltages,is proposed.This method improves the quality of the output power by eliminating the low-frequency sideband harmonics,and also enhances the fault-tolerance capability of the inverters.The simulation and experimental results obtained from the prototype of the CHBML inverter verify the suggested regulation strategy.
Key wordsCascaded H-bridge multilevel inverter    non-equal DC voltages    phase-shifted carrier PWM    fault-tolerance capability   
收稿日期: 2015-01-06      出版日期: 2016-01-21
PACS: TM464  
基金资助:国家高技术研究发展(863)计划(2013AA-050404)和国家自然科学基金(51277178)资助项目。
通讯作者: 蔡信健 男,1979年生,讲师,博士研究生,研究方向为高压变频器与电机控制。E-mail:xianmian2001@163.com     E-mail: 40999794@163.com
作者简介: 吴振兴 男,1982年生,副教授,博士,研究方向为光伏发电与高压变频器。E-mail:40999794@163.com
引用本文:   
蔡信健,吴振兴,孙乐,王书秀. 直流电压不均衡的级联H桥多电平变频器载波移相PWM调制策略的设计[J]. 电工技术学报, 2016, 31(1): 119-127. Cai Xinjian,Wu Zhenxing,Sun Le,Wang Shuxiu. Design for Phase-shifted Carrier Pulse Width Modulation of Cascaded H-bridge Multi-level Inverters with Non-equal DC Voltages. Transactions of China Electrotechnical Society, 2016, 31(1): 119-127.
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