Sathik M Jagabar, Almakhles Dhafer J, Sandeep N, Siddique Marif Daula
Renewable Energy Lab, College of Engineering, Prince Sultan University, Riyadh, Saudi Arabia.
SRM Institute of Science and Technology, Kattankulathur Campus, Chennai, India.
Sci Rep. 2021 Mar 3;11(1):5067. doi: 10.1038/s41598-021-84531-z.
Multilevel inverters play an important role in extracting the power from renewable energy resources and delivering the output voltage with high quality to the load. This paper proposes a new single-stage switched capacitor nine-level inverter, which comprises an improved T-type inverter, auxiliary switch, and switched cell unit. The proposed topology effectively reduces the DC-link capacitor voltage and exhibits superior performance over recently switched-capacitor inverter topologies in terms of the number of power components and blocking voltage of the switches. A level-shifted multilevel pulse width modulation scheme with a modified triangular carrier wave is implemented to produce a high-quality stepped output voltage waveform with low switching frequency. The proposed nine-level inverter's effectiveness, driven by the recommended modulation technique, is experimentally verified under varying load conditions. The power loss and efficiency for the proposed nine-level inverter are thoroughly discussed with different loads.
多电平逆变器在从可再生能源中提取电能并向负载高质量地输送输出电压方面发挥着重要作用。本文提出了一种新型单级开关电容九电平逆变器，它由一个改进的T型逆变器、辅助开关和开关单元组成。所提出的拓扑结构有效地降低了直流母线电容电压，并且在功率元件数量和开关的阻断电压方面，相较于最近的开关电容逆变器拓扑结构表现出卓越的性能。采用一种带有改进三角载波的电平移动多电平脉宽调制方案，以产生具有低开关频率的高质量阶梯状输出电压波形。在所推荐的调制技术驱动下，所提出的九电平逆变器的有效性在不同负载条件下通过实验得到了验证。针对所提出的九电平逆变器，详细讨论了不同负载情况下的功率损耗和效率。
