Leakage current is a serious problem in the transformerless solar PV inverter configurations. The flow of leakage current is mainly due to the high-frequency oscillations in the voltage across PV parasitic capacitance ( v_CPV ). Half-bridge (HB) and common ground type inverter topologies are highly suitable for eliminating these oscillations as these configurations allow direct electrical connection between the source and the load/grid ground. However, they suffer from either poor dc-bus utilization or asymmetric operation leading to dc-offset in the output voltage. In this article, a novel 1-φ, 5-level inverter is proposed, which employs a HB structure to eliminate voltage oscillations from v_CPV without compromising with the dc-bus utilization or symmetric operation. This is achieved by integrating a switched capacitor network with the HB structure. All the necessary analysis and design procedures are included to support the various claims. The claims are further validated using MATLAB simulations and experiments on a laboratory prototype. The proposed topology is compared with the various existing topologies of similar nature (like 5-level output voltage, common ground or HB type configuration and 1-φ) to prove its superiority.

中文翻译：

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基于开关电容技术的无变压器1-φ，5级半桥光伏逆变器配置

在无变压器的太阳能光伏逆变器配置中，泄漏电流是一个严重的问题。漏电流的流动主要归因于PV寄生电容两端电压的高频振荡（ v_{每次观看费用} ）。半桥（HB）和普通接地型逆变器拓扑非常适合消除这些振荡，因为这些配置允许在电源与负载/电网接地之间进行直接电连接。但是，它们会遭受不良的直流总线利用率或不对称操作的困扰，从而导致输出电压的直流偏移。本文提出了一种新颖的1-φ5电平逆变器，该逆变器采用HB结构来消除来自v_{每次观看费用}不会影响直流总线的利用率或对称运行。这是通过将开关电容网络与HB结构集成在一起来实现的。包括所有必要的分析和设计程序以支持各种要求。使用MATLAB仿真和实验室原型上的实验进一步验证了这些声明。将拟议的拓扑与具有类似性质的各种现有拓扑（例如5级输出电压，公共接地或HB型配置和1-φ）进行比较，以证明其优越性。