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一种新型小功率多电平逆变器的研究 被引量:4
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作者 邵松涛 陈宗祥 潘俊民 《电力电子技术》 CSCD 北大核心 2007年第7期9-11,共3页
多电平逆变器因其输出谐波小,器件开关频率低,电磁兼容性好等特性而成为研究热点。分析研究了一种新型的小功率多电平电压型逆变器(VSI),该逆变器是在二极管箝位型多电平逆变器基础上简化得到的。对逆变器主电路的结构和调制方式进行了... 多电平逆变器因其输出谐波小,器件开关频率低,电磁兼容性好等特性而成为研究热点。分析研究了一种新型的小功率多电平电压型逆变器(VSI),该逆变器是在二极管箝位型多电平逆变器基础上简化得到的。对逆变器主电路的结构和调制方式进行了详细阐述,在此基础上应用消除谐波脉宽调制(Subharmonic Pulse WidthModulation,简称SHPWM)技术得到了系统的控制策略,并利用高速信号处理器TMS320LF2407A作为系统控制器实现了控制方案。给出了仿真和样机实验结果,验证了理论分析。 展开更多
关键词 逆变器 脉宽调制 谐波/多电平
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Selective harmonic elimination method for wide range of modulation indexes in multilevel inverters using ICA
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作者 Ali Ajami Mohammad Reza Jannati Oskuee +1 位作者 Ataollah Mokhberdoran Hossein Shokri 《Journal of Central South University》 SCIE EI CAS 2014年第4期1329-1338,共10页
Selective harmonic elimination(SHE) in multilevel inverters is an intricate optimization problem that involves a set of nonlinear transcendental equations which have multiple local minima. A new advanced objective fun... Selective harmonic elimination(SHE) in multilevel inverters is an intricate optimization problem that involves a set of nonlinear transcendental equations which have multiple local minima. A new advanced objective function with proper weighting is proposed and also its efficiency is compared with the objective function which is more similar to the proposed one. To enhance the ability of the SHE in eliminating high number of selected harmonics, at each level of the output voltage, one slot is created. The SHE problem is solved by imperialist competitive algorithm(ICA). The conventional SHE methods cannot eliminate the selected harmonics and satisfy the fundamental component in some ranges of modulation indexes. So, to surmount the SHE defect, a DC-DC converter is applied. Theoretical results are substantiated by simulations and experimental results for a 9-level multilevel inverter. The obtained results illustrate that the proposed method successfully minimizes a large number of identified harmonics which consequences very low total harmonic distortion of output voltage. 展开更多
关键词 selective harmonic elimination DC-DC converter imperialist competitive algorithm(ICA)
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Theoretical analysis of the harmonic characteristics of modular multilevel converters 被引量:10
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作者 XIAO HuangQing XU Zheng +1 位作者 XUE YingLin TANG Geng 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第11期2762-2770,共9页
To understand the operation principle of the modular multilevel converter(MMC)deeply,it is necessary to study the harmonic characteristics of the MMC theoretically.Besides,the analytical harmonic formulas of the MMC a... To understand the operation principle of the modular multilevel converter(MMC)deeply,it is necessary to study the harmonic characteristics of the MMC theoretically.Besides,the analytical harmonic formulas of the MMC are useful in designing the main circuit,reducing the losses and improving the waveform quality.Based on the average switching function and the Fourier series harmonic analysis,this paper deduces the analytical expressions for such electrical quantities as the arm voltage,the arm current,the capacitor voltage,the capacitor current and the circulating current of the MMC.Finally,a digital model of a 21-level MMC-HVDC system is realized in PSCAD/EMTDC.The results of the analytical expressions coincide with the simulation results,which verify the effectiveness and feasibility of the proposed analytical expressions. 展开更多
关键词 modular multilevel converter harmonic characteristics average switching function Fourier series analysis PSCAD/EMTDC
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