Control-Based Two-Layer Protection for Short-Circuit Fault at an LVDC Feeder Branch

Energies

Chunyang Gu¹  Giampaolo Buticchi¹  Pat Wheeler¹  Sandro Guenter¹  Jiajun Yang¹  Sebastian Brueske² 

[1] Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, Department of Electrical and Electronic Engineering, University of Nottingham, Ningbo 315104, China;Maschinenfabrik Reinhausen GmbH, 93059 Regensburg, Germany;

关键词: LVDC protection;    power converters;    current limiting;    impedance model;    stability analysis;   

DOI  :  10.3390/en15114054

来源: DOAJ

【 摘 要 】

Low-voltage dc distribution offers high efficiency for grid integration of dc-based technologies such as photovoltaic and battery storage systems and new loads such as charging stations for electric vehicles due to reduced number of conversion stages. However, the selection of protection devices, protection coordination and selectivity is still subject to research. This work proposes to use a two-layer protection technique utilizing the control capability of power converters in case of a short-circuit fault at branch level of a low voltage dc feeder. The first layer is limiting the bus current using a virtual resistance in the droop control to avoid tripping of the grid-forming converter. The second layer implements a soft fuse tripping technique for selectivity. The control concept is presented and the system stability is analyzed using impedance-based stability analysis. Experimental results on a hardware-in-the-loop setup verify the findings.

【 授权许可】

Unknown