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Energies 2018, 11(9), 2415; https://doi.org/10.3390/en11092415

Improved Droop Control with Washout Filter

College of Electrical and engineering, Zhejiang University, Hangzhou 310027, China
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Received: 30 August 2018 / Revised: 8 September 2018 / Accepted: 10 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Power Electronics in Renewable Energy Systems)
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Abstract

In this paper, a droop washout filter controller (DWC), composed of a conventional droop controller and a washout filter controller, is proposed. The droop controller is used to ensure the “plug-and-play” capability, and the droop gain is set small. The washout filter is introduced to compensate the active power dynamic performance (APDP). Compared to the droop controller, the DWC can achieve accurate active power sharing and smaller frequency difference without losing the APDP. Additionally, a novel modeling technology is proposed, using which a small-signal model for an island microgrid (MG) is constructed as a singular system. The system’s stability is analyzed and the DWC is verified using real-time (RT-LAB) simulation with hardware in the loop (HIL). View Full-Text
Keywords: microgrid (MG); droop control; washout filter; hardware in the loop (HIL) microgrid (MG); droop control; washout filter; hardware in the loop (HIL)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hu, Y.; Wei, W. Improved Droop Control with Washout Filter. Energies 2018, 11, 2415.

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