Cover letter and Review response

A coupled inductor based buck-boost type single phase transformerless grid connected photo voltaic inverter which is having the ability to extract maximum power simultaneously from two serially connected subarrays is proposed in this paper. 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.

本文提出了一种基于耦合电感器的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连接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升降压特性导致了子阵列中串联模块数量的减少。此外，两个子阵列的独立运行在它们经历显著的运行条件不匹配时，提高了从子阵列中提取的总功率。耦合电感的采用降低了所提逆变器的元件数量、总体尺寸、重量和体积。另一方面，与基于单个电感器的升降压方案相比，它有助于在较高功率水平上实现中等程度的整体运行效率。采用了一种新的电感器电流控制技术，该技术独立于操作模式（连续导通模式或断续导通模式），用于控制电网电流。逆变器的拓扑结构和其控制技术限制了与子阵列相关的总体漏电流在可接受范围内。已制造了一个1千瓦的实验装置，并进行了彻底的实验分析，以证实所提逆变器的可行性。