Strategy for the Seamless Mode Transfer of an Inverter in a Master–Slave Control Independent Microgrid

Yi Wang; Hanhong Jiang; Pengxiang Xing

Strategy for the Seamless Mode Transfer of an Inverter in a Master–Slave Control Independent Microgrid

Yi Wang

Hanhong Jiang

Pengxiang Xing

Vol. 18, No. 1, pp. 251-265, Jan. 2018

10.6113/JPE.2018.18.1.251

H∞ robust controller

Master–slave control microgrid

Pre-synchronization

Seamless mode transfer

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Abstract

To enable a master–slave control independent microgrid system (MSCIMGS) to supply electricity continuously, the microgrid inverter should perform mode transfer between grid-connected and islanding operations. Transient oscillations should be reduced during transfer to effectively conduct a seamless mode transfer. This study uses a typical MSCIMGS as an example and improves the mode transfer strategy in three aspects: (1) adopts a status-tracking algorithm to improve the switching strategy of the outer loop, (2) uses the voltage magnitude and phase pre-synchronization algorithm to reduce transient shock at the time of grid connection, and (3) applies the hybrid-sensitivity H∞ robust controller instead of the current inner loop to improve the robustness of the controller. Simulations and experiments show that the proposed strategy is more practical than the traditional proportional–derivative control mode transfer and effective in reducing voltage and current oscillations during the transfer period.

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Cite this article

[IEEE Style]

Y. Wang, H. Jiang, P. Xing, "Strategy for the Seamless Mode Transfer of an Inverter in a Master–Slave Control Independent Microgrid," Journal of Power Electronics, vol. 18, no. 1, pp. 251-265, 2018. DOI: 10.6113/JPE.2018.18.1.251.

[ACM Style]

Yi Wang, Hanhong Jiang, and Pengxiang Xing. 2018. Strategy for the Seamless Mode Transfer of an Inverter in a Master–Slave Control Independent Microgrid. Journal of Power Electronics, 18, 1, (2018), 251-265. DOI: 10.6113/JPE.2018.18.1.251.