摘要
提出了一种级联多电平变换器的新型混合PWM技术。该技术以载波层叠PWM与载波移相PWM为基础,通过结合载波层叠PWM中的载波分布以多个层叠小三角载波代替载波移相PWM技术中三角载波来实现调制。分析研究了在相同开关频率下的采用载波移相PWM技术、载波层叠PWM技术、传统混合PWM技术以及所提出的PWM技术在五电平和七电平级联H桥变换器中的性能。结果表明在整个调制比范围内,该技术不仅整体的线电压的总谐波失真(THD)值更小,而且在相同调制度下该技术对输出线电压和线电流基波幅值有显著提高。仿真试验结果论证了该技术对谐波性能优化以及对直流电压的利用率提高。新型混合PWM技术能应用于不同电平的级联多电平变换器而保持原有性能。最后,通过实验证明了理论分析与仿真研究的正确性。
In this paper,we proposed a novel hybrid PWM technique for cascaded H-bridge multilevel converter.The technique combines CD-PWMand PS-PWM techniques by replacing a single triangular carrier of PS-PWM with several little triangular carriers distributed vertically as the PD-PWM technique.The performance comparison between PS-PWM,CD-PWM,traditional hybrid PWM and the proposed technique is presented for 5-level and 7-levelcascaded H-Bridge converters with the same device switching frequency. The results show that the proposed technique has not only an overall smaller total harmonic distortion （THD）of line voltage,especially in the low modulation index,but also larger fundamental amplitude within whole range of the modulation ratio.Simulation experimental results prove that the harmonic performance of the novel hybrid PWM technique is better and the DC-link voltage utilization improves significantly compared with other techniques.The novel hybrid PWMtechnique can also be used for different level cascaded multilevel converter with the same performance.Finally,the experiment proved the correctness of the theoretical analysis and simulation research.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2016年第10期2234-2242,共9页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(51307026)
国家科技支撑计划课题(2013BAG25B01)
高等学校博士学科点专项科研基金(20132304120015)
黑龙江省博士后科研启动金项目(LBH-Q14040)
MPRD专项支持(IEP-0401)
东南大学毫米波国家重点实验室开放课题(K201707)
中央高校基本科研业务费(HEUCF160414)项目资助
关键词
载波PWM
多电平变换器
谐波分析
基波幅值
carrier PWM
multilevel converter
harmonic analysis
fundamental amplitude
