二极管在去耦无变压器光伏逆变器拓扑结构中漏电流抑制机制中的作用

G. Orfanoudakis, E. Koutroulis, G. Foteinopoulos
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引用次数: 1

摘要

传统的直流/交流逆变器用于将光伏(PV)能源整合到公用电网中,已知会产生接地漏电流,这可能会损坏光伏电池并造成安全隐患。无变压器光伏逆变器拓扑结构提供了一种解决漏电流问题的现代解决方案。本文着重于解耦无变压器拓扑,并通过考虑逆变二极管通常被忽视的作用,提供了其漏电流抑制机制的完整解释。结果表明,除了额外的半导体开关外,二极管对于实现泄漏电流抑制是必不可少的,而流经它们的泄漏电流从根本上影响逆变器共模电压的波形。本文的分析得到了MATLAB-Simulink仿真结果的支持。
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The role of diodes in the leakage current suppression mechanism of decoupling transformerless PV inverter topologies
Conventional DC/AC inverters used for the integration of photovoltaic (PV) energy sources to the utility grid are known to give rise to ground leakage currents, which can damage the PV cells and cause safety hazards. A modern solution to the leakage current problem is offered by transformerless PV inverter topologies. This paper focuses on the class of decoupling transformerless topologies and provides a complete explanation of their leakage current suppression mechanism, by considering the commonly neglected role of the inverter diodes. It is demonstrated that, apart from additional semiconductor switches, the diodes are essential for achieving leakage current suppression, while the leakage current that flows through them radically affects the waveform of the inverter common-mode voltage. The presented analysis is supported by simulation results in MATLAB-Simulink.
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