Fault Ride-Through Capability Enhancement for Microinverter Applications

Journal of Renewable Energy Pub Date : 2019-03-07 DOI:10.1155/2019/1036156

Sajad A. Ansari, Amirreza Mizani, S. Ashouri, J. Moghani

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引用次数: 9

Abstract

Due to the fast growth of single-phase grid-connected photovoltaic (PV) systems, the existing grid codes are expected to be modified to guarantee the availability, quality, and reliability of the electrical system. Therefore, the future single-phase PV systems should become smarter and support low voltage ride-through (LVRT) capability, which are required for three-phase wind power systems. In this paper, the operation principle of a flyback inverter in a low-voltage ride-through operation is demonstrated in order to map future challenges. The steady state performance of the flyback inverter under voltage rise and drop conditions at boundary conduction mode (BCM) and discontinues conduction mode (DCM) is studied theoretically. The simulation results of the flyback inverter for various grid faults are presented to verify the theoretical analyses. The results indicate the fact that the flyback inverter at BCM condition can provide LVRT capability for photovoltaic microinverter applications in distributed generation (DG) systems, even though it does not need any auxiliary control branches and any limitations in components design.

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增强微型逆变器应用的故障穿越能力

由于单相并网光伏（PV）系统的快速发展，预计将修改现有的电网规范，以确保电力系统的可用性、质量和可靠性。因此，未来的单相光伏系统应该变得更智能，并支持三相风电系统所需的低电压穿越（LVRT）能力。本文展示了反激式逆变器在低压穿越运行中的工作原理，以应对未来的挑战。从理论上研究了反激式逆变器在边界导通模式和断续导通模式下的电压上升和下降条件下的稳态性能。给出了反激式逆变器在各种电网故障下的仿真结果，验证了理论分析的正确性。结果表明，在BCM条件下的反激式逆变器可以为分布式发电（DG）系统中的光伏微逆变器应用提供LVRT能力，尽管它不需要任何辅助控制分支和部件设计的任何限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Renewable Energy

自引率

0.00%

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审稿时长

21 weeks