A Control Scheme Based on Virtual Impedance and Droop Control to Share Power in an Island Microgrid

Narges S. Ghiasi, R. Hadidi, S. Ghiasi, Sahand Liasi
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引用次数: 2

Abstract

One challenge to utilizing inverter-based distributed energy resources in islanded microgrids is the proper power distribution between them. Improper power allocation causes resource overload and disturbs the balance of supply and demand, which can be eliminated using a droop controller. However, different operating points and loading conditions decrease the accuracy of this method. This paper aims to present a plan to improve the power distribution in islanded microgrids. To enhance the performance of droop control, the virtual impedance is exploited, giving the operator the ability to effectively control the impedance between the inverter and the load. The proposed method is evaluated in the case of linear, nonlinear, and unbalanced loads.
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基于虚拟阻抗和下垂控制的孤岛微电网共享功率控制方案
在孤岛微电网中利用基于逆变器的分布式能源面临的一个挑战是它们之间的适当功率分配。电力分配不当导致资源过载,扰乱供需平衡,可采用下垂控制器加以消除。然而,不同的工作点和载荷条件会降低该方法的精度。本文旨在提出一种改善孤岛微电网配电的方案。为了提高下垂控制的性能,利用虚拟阻抗,使操作员能够有效地控制逆变器与负载之间的阻抗。在线性、非线性和不平衡负载的情况下对所提出的方法进行了评估。
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