Hybrid-bridge transformerless photovoltaic grid-connected inverter
Hybrid-bridge transformerless photovoltaic grid-connected inverter
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DOI：
10.1049/iet-pel.2013.0785
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发表时间：
2015-03
影响因子：
2
通讯作者：
Wenfeng Cui;Haoze Luo;Yunjie Gu;Wuhua Li;Bo Yang;Xiangning He
中科院分区：
文献类型：
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作者：
Wenfeng Cui;Haoze Luo;Yunjie Gu;Wuhua Li;Bo Yang;Xiangning He
由于低成本和高效率的考虑，具有漏电流抑制功能的无变压器逆变器已成为并网光伏系统中的迫切应用趋势。在本研究中，半桥模块和中性点钳位（NPC）模块相结合，产生了一种先进的混合桥无变压器逆变器，与传统的半桥或NPC逆变器相比，它不仅可以抑制漏电流，还可以降低所需的母线电压。提出了一种无死区时间的正弦脉宽调制策略，以提高并网电能质量和系统可靠性。此外，还提供了详细的电路性能比较和实际评估，以显示混合桥无变压器逆变器的明显优势。它还通过考虑电路寄生参数等影响因素，为漏电流最小化提供了实用的解决方案。最后，对3 kW样机进行了测试，以验证该研究的理论分析和主要贡献。
The transformerless inverters with leakage current suppression have become an urgent application tendency in grid-connected photovoltaic systems because of low cost and high efficiency concerns. In this study, the half-bridge module and neutral point clamping (NPC) module are combined to derive an advanced hybrid-bridge transformerless inverter, which not only suppresses leakage current, but also reduces the required bus voltage compared to the conventional half-bridge or NPC inverters. A sinusoidal pulse-width modulation strategy without dead time is presented to enhance both the grid-connected power quality and system reliability. Furthermore, a detailed circuit performance comparison and practical evaluation are presented to show the clear advantages of the hybrid-bridge transformerless inverter. It also provides practical solutions for the leakage current minimisation by considering the contributing factors such as circuit parasitic parameters. Finally, a 3 kW prototype is tested to verify the theoretical analysis and main contributions of the study.