A coupled inductor-based buck–boost type single phase transformerless grid connected photo voltaic inverter which has the ability to extract maximum power simultaneously from two serially connected subarrays is proposed in this article. The series connection of the two subarrays, and the buck–boost nature of the inverter result in reduction of the number of modules which are connected in series in a subarray. Further, independent operation of the two subarrays enhances the overall power extracted from the subarrays while they are experiencing significant mismatch in their operating conditions. The deployment of the coupled inductors has reduced the component count and overall size, weight, and volume of the proposed inverter. On the other hand it helps to achieve moderately high overall operating efficiency at higher power level as compared to the single inductor-based buck–boost schemes. A new inductor current control technique which is independent of the mode of operation (CCM or DCM) is adopted to control the grid current. The topological structure of the inverter, and its control technique restrict the overall leakage current related to the subarrays within the permissible limit. A 1-kW experimental setup has been fabricated and thorough experimental analysis are performed to confirm the viability of the proposed inverter.

中文翻译：

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一种基于耦合电感的升降压型并网无变压器光伏逆变器，具有同时控制两个子阵列的能力

本文提出了一种基于耦合电感的降压-升压型单相无变压器并网光伏逆变器，该逆变器能够同时从两个串联的子阵列中提取最大功率。两个子阵列的串联连接以及逆变器的降压-升压特性导致子阵列中串联连接的模块数量减少。此外，两个子阵列的独立操作增强了从子阵列提取的整体功率，同时它们在它们的操作条件中经历了显着的失配。耦合电感器的部署减少了所提议逆变器的组件数量和整体尺寸、重量和体积。另一方面，与基于单电感器的降压-升压方案相比，它有助于在更高的功率水平下实现适度高的整体工作效率。采用一种独立于操作模式（CCM 或 DCM）的新型电感器电流控制技术来控制电网电流。逆变器的拓扑结构及其控制技术将与子阵列相关的总漏电流限制在允许的范围内。已经制作了一个 1 kW 的实验装置，并进行了彻底的实验分析，以确认所提出的逆变器的可行性。其控制技术将与子阵列相关的总漏电流限制在允许的范围内。已经制作了一个 1 kW 的实验装置，并进行了彻底的实验分析，以确认所提出的逆变器的可行性。其控制技术将与子阵列相关的总漏电流限制在允许的范围内。已经制作了一个 1 kW 的实验装置，并进行了彻底的实验分析，以确认所提出的逆变器的可行性。