Cover letter and Review response
收藏资源简介：
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.
本文提出一种基于耦合电感（coupled inductor）的升降压（buck-boost）型单相无变压器（transformerless）并网光伏逆变器，其可同时从两个串联连接的子阵列（subarray）中提取最大功率。该逆变器通过采用双子阵列串联拓扑，并结合自身升降压特性，有效减少了单条子阵列中串联光伏组件的数量。当两个子阵列的运行工况存在显著失配时，二者的独立运行模式可提升从子阵列中提取的总功率。耦合电感的应用不仅缩减了所提逆变器的元件数量与整体尺寸、重量及体积，相较于单电感升降压拓扑方案，还可在高功率工况下实现较高的整体运行效率。本文采用一种全新的电感电流控制技术，其无需区分变换器的两种典型工作模式：连续导通模式（Continuous Conduction Mode, CCM）与断续导通模式（Discontinuous Conduction Mode, DCM），即可实现并网电流的精准控制。该逆变器的拓扑结构与控制策略可将与子阵列相关的总漏电流（leakage current）限制在允许范围内。本文搭建了一台1 kW的实验样机，并开展了全面的实验分析，以验证所提逆变器的可行性。
