Intelligent over-current protection scheme in inverter-based microgrids

Rahmat Khezri, Shoresh Shokoohi, S. Golshannavaz, H. Bevrani
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引用次数: 4

Abstract

Recently by technological developments in inverterbased devices, application of these prominent apparatus has gained more attention in newly emerged microgrids (MGs). In this paradigm, the concept of multiple inverter-interfaced distributed generations (IIDGs)-based MG is now a reputable term. According to fast dynamic responses of IIDGs, study of their transient behaviors seems essential. Among the important indices of IIDG-based MGs in transient situations, the current index is the most susceptible one, which should not be higher than twice values of rated current due to their physical constraints. This paper proposes a proportional-integral (PI) controller adjoined in the voltage source inverter control loop to well-protect the IIDGs against the possible over currents during short circuit faults in MG. To adapt the PI controller for both connected and autonomous modes and different short circuit faults in MG, fuzzy logic as an intelligent method is employed to fine-tune of the PI gains. The obtained results illustrate the efficiency of fuzzy-based fine tuning approach.
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基于逆变器的微电网智能过流保护方案
近年来,随着基于逆变器的设备技术的发展,这些卓越的设备在新兴微电网中的应用受到了越来越多的关注。在这种范例中,基于多逆变器接口的分布式代(iidg)的概念现在是一个有声望的术语。由于iidg的快速动态响应特性,对其瞬态特性的研究显得十分必要。在瞬态状态下基于iidg的mg的重要指标中,电流指标是最易受影响的指标,由于其物理约束,电流指标不应高于额定电流的两倍。本文提出了一种与电压源逆变器控制环相连接的比例积分(PI)控制器,可以很好地保护iidg在MG短路故障时可能产生的过流。为了使PI控制器适应MG系统的连接模式和自主模式以及不同的短路故障,采用模糊逻辑作为智能方法对PI增益进行微调。实验结果表明,基于模糊的微调方法是有效的。
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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