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Phase unbalance mitigation by three-phase damping voltage-based droop controllers in microgrids

机译：微电网中基于三相阻尼电压的下垂控制器的相不平衡缓解

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摘要

Microgrids aggregate grid assets in geographically confined areas, allowing them to locally tackle grid issues and capture the value of their aggregated flexibility by bringing intelligence in the grid in a bottom-up approach. For the control of distributed generation units in single-phase islanded microgrids, the voltage-based droop (VBD) control strategy has already been developed. The VBD strategy can also be used in grid-connected microgrids, which makes a transition between both modes possible. Phase unbalance is a significant issue in three-phase microgrids and will become more pressing with increasing penetration of single-phase renewables. Therefore, the effect of several traditional control strategies for three-phase distributed generation units to phase unbalance is discussed. Subsequently, in this paper, a new control strategy is presented which extends the basic VBD control strategy so it can be used as a three-phase controller which at the same time mitigates unbalance in islanded and grid-connected microgrids, i.e., the three-phase damping VBD control. It is concluded that the presented three-phase damping VBD control method mitigates unbalance, allows the DG units to share the unbalanced currents, and is able to operate both in grid-connected and islanded systems. (C) 2015 Elsevier B.V. All rights reserved.
机译：微电网将地理区域内的电网资产聚合在一起，从而使他们能够通过自下而上的方式将智能引入电网，从而在本地解决电网问题并获得其聚合灵活性的价值。为了控制单相岛状微电网中的分布式发电单元，已经开发了基于电压的下垂（VBD）控制策略。 VBD策略还可以用于并网的微电网，这使得两种模式之间的转换成为可能。相不平衡是三相微电网中的一个重要问题，随着单相可再生能源渗透率的提高，相平衡将变得更加紧迫。因此，讨论了几种传统控制策略对三相分布式发电机组相位不平衡的影响。随后，在本文中，提出了一种新的控制策略，该控制策略扩展了基本的VBD控制策略，因此可以用作三相控制器，同时减轻孤岛和并网微电网的不平衡，即，三个相位阻尼VBD控制。结论是，提出的三相阻尼VBD控制方法减轻了不平衡，允许DG单元共享不平衡电流，并且能够在并网和孤岛系统中运行。 （C）2015 Elsevier B.V.保留所有权利。

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