Voltage step-up, DC/AC inversion, and active pulsating-power-buffering are three indispensable functions of next-generation PV micro-inverters. Conventionally, these three functions are realized by separate power-conversion stages, resulting in lower conversion efficiency and a higher cost. In this paper, a new hybrid topology capable of merging all three functions into a single power-conversion stage is proposed. The topology enjoys all the benefits of system integration, including simple circuit structure and low bill-of-materials. It also features low voltage stresses, significantly reduced energy storage requirement of the passive components, and low leakage current, potentially leading to highly compact and high efficiency design. A 60-W hardware prototype is built to demonstrate the feasibility of the proposed inverter. An efficiency over 95% across a wide load range has been experimentally obtained.

中文翻译：

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无变压器三电平无电容飞跨式升压光伏微型逆变器

升压，DC / AC逆变和有源脉动功率缓冲是下一代PV微逆变器的三个必不可少的功能。传统上，这三个功能是通过单独的功率转换级来实现的，导致转换效率较低且成本较高。在本文中，提出了一种新的混合拓扑，该拓扑能够将所有三个功能合并为一个功率转换级。该拓扑结构具有系统集成的所有优点，包括简单的电路结构和较低的物料清单。它还具有低电压应力，无源组件的能量存储需求显着降低以及泄漏电流低的特点，从而有可能导致高度紧凑和高效的设计。构建了一个60 W的硬件原型，以演示所建议的逆变器的可行性。