电机与控制学报
電機與控製學報
전궤여공제학보
Electric Machines and Control
2015年
11期
39-44
,共6页
混合级联多电平逆变器%混合调制%超调%总谐波失真%频谱分析
混閤級聯多電平逆變器%混閤調製%超調%總諧波失真%頻譜分析
혼합급련다전평역변기%혼합조제%초조%총해파실진%빈보분석
hybrid cascaded multilevel inverters%hybrid modulation%over modulation%total harmonics elimination%spectrum analysis
针对于Ⅲ型混合级联型多电平逆变器调制中,逆变器输出的相电压及线电压包含低频次谐波,以及大调制度下出现的超调问题,提出了一种改进的混合调制策略。该策略通过调制波和一对三角载对高压单元进行调制,得到高压单元输出的 PWM 波,再利用调制波与高压单元输出的PWM波的差值作为低压单元的调制波对低压单元进行调制,得到低压单元输出的PWM波。仿真与实验结果表明该策略能够消除Ⅲ逆变器输出相电压及线电压中的5次和7次低频谐波和超调现象,逆变器输出的相电压和线电压的总谐波失真( total harmonic elimination, THD)分别为14．53%和12．47%,频谱含量主要分布在2mf 两侧。
針對于Ⅲ型混閤級聯型多電平逆變器調製中,逆變器輸齣的相電壓及線電壓包含低頻次諧波,以及大調製度下齣現的超調問題,提齣瞭一種改進的混閤調製策略。該策略通過調製波和一對三角載對高壓單元進行調製,得到高壓單元輸齣的 PWM 波,再利用調製波與高壓單元輸齣的PWM波的差值作為低壓單元的調製波對低壓單元進行調製,得到低壓單元輸齣的PWM波。倣真與實驗結果錶明該策略能夠消除Ⅲ逆變器輸齣相電壓及線電壓中的5次和7次低頻諧波和超調現象,逆變器輸齣的相電壓和線電壓的總諧波失真( total harmonic elimination, THD)分彆為14．53%和12．47%,頻譜含量主要分佈在2mf 兩側。
침대우Ⅲ형혼합급련형다전평역변기조제중,역변기수출적상전압급선전압포함저빈차해파,이급대조제도하출현적초조문제,제출료일충개진적혼합조제책략。해책략통과조제파화일대삼각재대고압단원진행조제,득도고압단원수출적 PWM 파,재이용조제파여고압단원수출적PWM파적차치작위저압단원적조제파대저압단원진행조제,득도저압단원수출적PWM파。방진여실험결과표명해책략능구소제Ⅲ역변기수출상전압급선전압중적5차화7차저빈해파화초조현상,역변기수출적상전압화선전압적총해파실진( total harmonic elimination, THD)분별위14．53%화12．47%,빈보함량주요분포재2mf 량측。
Aiming at problems that output phase voltage and line voltage waveforms of III hybrid cascaded multi-level inverter including low frequency harmonics and over modulation phenomenon, an improved hybrid modulation strategy was presented. A pair of triangular carrier waveforms and modulation waveform was used to produce PWM wave of high-voltage cell, then the difference of modulation wave and PWM wave of high-voltage cell was used to produce PWM wave of low-voltage cell. Simulation and experiment results show that the total harmonic elimination ( THD) of III hybrid cascaded multi-level inverter phase voltage and line voltage are 14. 53% and 12. 47% respectively, and harmonics distributes on both sides with 2mf.
