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| Abstract: |
| The single-phase three-level voltage source inverter based on wavelet modulation (WM) is proposed. The WM technique is based on constructing a nondyadic-type multi-resolution analysis (MRA), which supports sampling continuous-time sinusoidal signals in a nonuniform recurrent manner, and then reconstructing it by using inverter switching actions. In order to further improve the output voltage waveform and reduce harmonic distortion, the wavelet modulation is used to three-level inverter. The high magnitude of fundamental component and significantly reduced harmonic contents of the inverter output voltage can be achieved by using WM in the single-phase three-level voltage source inverter. Furthermore, the WM algorithm is implemented by using only one element government (EV) in DSP. The simulated and experimental results prove the accuracy and feasibility of the WM scheme for single-phase three-level voltage source inverter. |
| Key words: wavelet modulation three-level voltage source inverters harmonic contents fundamental component |
| DOI：10.11916/j.issn.1005-9113.15183 |
| Clc Number:TM464 |
| Fund: |
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| Descriptions in Chinese: |
| 单相三电平逆变器小波调制策略的研究 刘洪臣，范国磊，苏振霞 （哈尔滨工业大学电气工程及自动化学院，哈尔滨150001） 创新点说明：提出了单相三电平逆变器的小波调制策略，提高了输出电压的基波含量，降低了输出电压的谐波含量。 研究目的： 将小波调制应用于三电平逆变器中，降低输出电压中的谐波含量。 研究方法： 1.小波调制策略从两电平逆变器扩展到三电平逆变器； 2. 通过理论分析三电平逆变器小波调制策略的输出电压基波和谐波含量，证明其方法的优越性； 3. 通过仿真和实验对所提方法的正确性进行了验证。 结果： 基于小波调制的三电平逆变器的输出电压的基波含量高，谐波含量低； 结论： 三电平逆变器小波调制的输出电压谐波含量小、基波幅值大，能很好的改善输出电压质量，并且开关频率低，算法简单，易于实现。对于小波调制策略而言，研究表明小波调制总采样组数D与电压谐波畸变率存在非线性关系，因此当选择适当的采样组数D时，逆变器的开关频率、开关损耗及谐波畸变率将很小。 关键词：小波调制；三电平逆变器；谐波含量；基波 |
