Switched capacitor multilevel inverter topologies are attractive among industrial power electronics researchers due to their applicability in sustainable energy systems such as renewable energy source (RES) applications. In this paper, a new switched capacitor (SC)-based grid-tied seven-level inverter is proposed for renewable energy sources (RES) applications. The proposed inverter can generate a seven-level output voltage waveform with voltage boosting ability and a gain factor of 3. Also, the proposed topology can provide the self voltage balancing for capacitors. The most important challenge of the SC-based topologies, i.e., the capacitor charging spike current, is solved by applying a soft charging circuit in the charging loop of the capacitors. The soft charging circuit consists of an inductor and a power diode in the capacitor charging path. Using a small size inductor in the soft charging circuit, the proposed inverter can limit the input current spikes. Comprehensive experiment results and comparisons are presented to verify the accurate performance of the proposed inverter.

中文翻译：

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一种新型高升压 SC 并网逆变器，适用于 RES 应用，具有有限的充电峰值

开关电容器多电平逆变器拓扑因其在可再生能源 (RES) 应用等可持续能源系统中的适用性而受到工业电力电子研究人员的青睐。本文提出了一种用于可再生能源（RES）应用的新型基于开关电容器（SC）的并网七电平逆变器。所提出的逆变器可以产生具有升压能力和增益因子为3的七级输出电压波形。此外，所提出的拓扑可以为电容器提供自电压平衡。基于 SC 的拓扑最重要的挑战，即电容器充电尖峰电流，通过在电容器充电环路中应用软充电电路来解决。软充电电路由电容器充电路径中的电感器和功率二极管组成。在软充电电路中使用小尺寸电感器，所提出的逆变器可以限制输入电流尖峰。提供综合实验结果和比较，以验证所提出的逆变器的准确性能。