Implementation of cascaded asymmetrical multilevel inverter for renewable energy integration,International Journal of Circuit Theory and Applications

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Implementation of cascaded asymmetrical multilevel inverter for renewable energy integration
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-02-19 , DOI: 10.1002/cta.2944
Vishal Anand ₁ , Varsha Singh ₁

Affiliation

This paper aims to develop a new cascaded asymmetrical multilevel inverter with less number of switches for photovoltaic power generation. The structure contains three sources and 11 switches. A design of proposed structure is suggested for PV application. A few more algorithms for cascade extension are also proposed to obtained maximum voltage levels using least numbers of switching devices. PD LS-PWM modulation is used to control gate pulses of the switches. The structure produce 15 levels using one inverter, whereas 85 levels using a cascaded inverter. The magnitude of sources in cascade inverter is governed by algorithms. A comparative assessment for optimal algorithm is developed considering, sources, switches, and other performance parameters. The simulation and hardware is performed for 15-level and 85-level asymmetrical inverter for variation in modulation index and frequency. The efficiency of multilevel inverter is evaluated using PSIM tool. The performance indices, power loss analysis, switching stresses, and blocking voltages across the switches are simulated and validated. The cascade structure, 85 levels produce high quality waveform, for which THD is less than 5%. Thus, this structure suits series combination of various PV panels and achieve power utilising renewable energy sources.

中文翻译：

用于可再生能源集成的级联非对称多电平逆变器的实现

本文旨在开发一种新型的级联非对称多电平逆变器，用于光伏发电的开关数量较少。该结构包含三个源和 11 个开关。建议为光伏应用设计一个提议的结构。还提出了更多用于级联扩展的算法，以使用最少数量的开关设备获得最大电压电平。PD LS-PWM 调制用于控制开关的栅极脉冲。该结构使用一个反相器产生 15 个电平，而使用一个级联反相器产生 85 个电平。级联逆变器中源的大小由算法控制。考虑到源、开关和其他性能参数，开发了最佳算法的比较评估。针对调制指数和频率变化的15级和85级非对称逆变器进行仿真和硬件。使用 PSIM 工具评估多电平逆变器的效率。性能指标、功率损耗分析、开关应力和开关两端的阻断电压都经过仿真和验证。级联结构，85级产生高质量波形，THD小于5%。因此，这种结构适合各种光伏电池板的串联组合，实现利用可再生能源发电。85级产生高质量波形，THD小于5%。因此，该结构适合各种光伏面板的串联组合，并利用可再生能源实现发电。85级产生高质量波形，THD小于5%。因此，这种结构适合各种光伏电池板的串联组合，实现利用可再生能源发电。

更新日期：2021-02-19

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