Virtual DC machine based islanding detection method in DC distribution system and stability enhancement

IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society Pub Date : 2020-10-18 DOI:10.1109/IECON43393.2020.9254591

Hao Hu, Miao Zhu, Xiuyi Li, X. Cai

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引用次数: 1

Abstract

DC distribution system has become a hot spot in the field of integration of distributed generators (DGs) and DC loads owing to the improved system reliability and efficiency. Virtual DC machine (VDCM) control provides DC-DC converters inertia feature and improves stability. Meanwhile, islanding detection has become the key issue of the reliable operation of DC distribution system but relative researches are still in infancy. This paper presents a VDCM based islanding detection method for DGs using voltage feedback. The feedback gain that causes system instability in islanding condition while still preserves stability in grid-connected mode is theoretically obtained. To improve the system stability and extend the feedback gain range to realize a better islanding detection performance, an active damping control for stability enhancement is further proposed. The impact of system parameters on stability is analyzed in detail. Both the proposed islanding detection method and stability enhancement for DGs are verified by system simulation.

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基于虚拟直流机的直流配电系统孤岛检测方法及稳定性增强

直流配电系统由于提高了系统的可靠性和效率，已成为分布式发电机与直流负荷集成领域的研究热点。虚拟直流机(VDCM)控制提供了DC-DC变换器的惯性特性，提高了稳定性。同时，孤岛检测已成为直流配电系统可靠运行的关键问题，但相关研究还处于起步阶段。本文提出了一种基于电压反馈的VDCM孤岛检测方法。从理论上得到了在孤岛状态下引起系统不稳定而在并网模式下仍保持稳定的反馈增益。为了提高系统稳定性，扩大反馈增益范围，实现更好的孤岛检测性能，进一步提出了一种增强系统稳定性的主动阻尼控制。详细分析了系统参数对稳定性的影响。通过系统仿真验证了所提出的孤岛检测方法和增强DGs稳定性的方法。

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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IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society

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