Conventional five-level current source inverters (CSIs) face issues with current imbalances, necessitating complex balancing controls. A recent innovation introduced the X-type five-level CSI, offering inherent current balancing. However, it demands a sizable dc inductance and exhibits reduced voltage gain at higher modulation indexes. This article presents a novel Γ-type five-level CSI, requiring a significantly smaller dc inductor while achieving higher voltage gain and efficiency under large modulation indexes. Additionally, it maintains the inherent current balancing characteristic. Detailed derivations and calculations concerning inverter gain, passive components, transient voltage analysis, and efficiency are provided. The performance of this newly proposed inverter is validated through simulation and laboratory-scaled experiments.

中文翻译：

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Г型五电平电流源逆变器

传统的五电平电流源逆变器（CSI）面临电流不平衡的问题，需要复杂的平衡控制。最近的一项创新推出了 X 型五级 CSI，提供固有的电流平衡。然而，它需要相当大的直流电感，并且在较高调制指数下电压增益会降低。本文提出了一种新颖的 Γ 型五电平 CSI，需要明显更小的直流电感器，同时在大调制指数下实现更高的电压增益和效率。此外，它还保持了固有的电流平衡特性。提供了有关逆变器增益、无源元件、瞬态电压分析和效率的详细推导和计算。这种新提出的逆变器的性能通过仿真和实验室规模的实验进行了验证。