光伏系统通用部分容错单相共地多电平逆变器

Soniya Agrawal;Manoranjan Sahoo;Sateesh Kumar Kuncham;Yam Prasad Siwakoti
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引用次数: 0

摘要

共地多电平逆变器(MLI)在无变压器光伏(PV)系统中具有提高漏电性能和减小滤波器尺寸的优点。在共地逆变器中,容错能力是提高系统可靠性的关键。本文重点研究了不同开路开关故障条件下单相共地MLI的傅立叶变换策略。该电路可以在正常和开路故障情况下自平衡开关电容(SC)上的电压。此外,所采用的调制方案使sc可以串联或并联,从而在降低输入电压的情况下获得大范围的输出电压。此外,电路可以通过添加SC细胞扩展到更高的电压水平。详细的马尔可夫可靠性和成本函数评估突出了逆变器相对于计数器拓扑的优点。最后,通过500w样机实验验证了逆变器运行的可行性和有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Generalized Partial Fault-Tolerant Single-Phase Common-Ground Multilevel Inverter for PV System
The common ground multilevel inverter (MLI) is highly appreciated in transformerless photovoltaic (PV) systems, which have improved leakage current performance and reduced filter size. The fault-tolerant (FT) capability is essential in a common ground inverter to enhance the reliability of the system. This paper highlights a FT strategy for single-phase common ground MLI under different open switch fault conditions. The proposed circuit can self-balance the voltage across the switched capacitor (SC) in normal and switch open circuit (OC) fault conditions. Moreover, the employed modulation scheme enables the SCs to be connected in series or parallel to obtain a wide range of output voltages with reduced input voltage. Further, the circuit can be extended for higher voltage levels by adding SC cells. A detailed Markov reliability and cost function assessment highlights the merits of the proposed inverter over counter topologies. Finally, the inverter's operational feasibility and effectiveness are validated through 500 W prototype experimentally.
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CiteScore
8.80
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