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首页> 外文会议>IEEE Applied Power Electronics Conference and Exposition >Single-Stage Three-Phase Step-Up SEPIC Differential Grid-Tied Inverter Features an In-depth Mathematical Analysis for Solving Practical Design Issues
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Single-Stage Three-Phase Step-Up SEPIC Differential Grid-Tied Inverter Features an In-depth Mathematical Analysis for Solving Practical Design Issues

机译：单级三相升压SEPIC差分电网栓逆变器具有深入的数学分析，用于解决实际设计问题

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High-frequency transformer (HFT) utilization in a three-phase Grid-tied SEPIC-based differential inverter (SEPIC-BDI) increases its popularity in current inverter applications. Also, it provides high power density, low common-mode voltage (CMV), and low leakage current. However, the negative sequence harmonic component (NSHC), a common low-order harmonic in all types of differential inverters topologies, introduces a practical issue in this good topology. Where the leakage inductance of the utilized HFTs increases the percentage of NSHC. Therefore, this paper presents an in-depth mathematical analysis for NSHC and its practical design issues with the SEPIC converters. This analysis is vital during the design and control implementation of SEPIC-BDI. The analysis combines the differential inverter and SEPIC converters characteristics to properly investigate its primary source and provide helpful insight into the design process. It worth noticing that this mathematical analysis is generic for all types of differential inverter topologies and valid for other boost and buck-boost-based differential inverters. Moreover, a two-loop control strategy based on a Type-II controller in the first loop and low-pass filters (LPFs) in the second loop is performed to regulate the injected grid-current and eliminate the NSHC. Finally, the validity of this analysis is verified by numerical simulation and experimental supporting results.
机译：三相电网系丝差分逆变器（SEPIC-BDI）中的高频变压器（HFT）利用增加了当前逆变器应用中的普及。此外，它提供了高功率密度，低共模电压（CMV）和低漏电流。然而，负序谐波分量（NSHC），在所有类型的差分逆变器拓扑中，常见的低位谐波，在这种良好的拓扑中引入了实际问题。其中利用HFT的泄漏电感增加了NSHC的百分比。因此，本文介绍了NSHC的深入数学分析及其与SEPIC转换器的实际设计问题。在Sepic-BDI的设计和控制实施过程中，该分析至关重要。分析结合了差分逆变器和SEPIC转换器特性，以适当地研究其主要源，并提供有用的洞察设计过程。值得注意的是，该数学分析是所有类型的差分逆变器拓扑的通用，并且适用于其他升压和降压 - 升压基差分逆变器。此外，执行基于第二环中的第一环和低通滤波器（LPFS）中的II型控制器的双环控制策略，以调节注入的网格电流并消除NSHC。最后，通过数值模拟和实验支持结果验证了该分析的有效性。

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