Presentation Details
| A Novel Protection Algorithm for PV Interconnections in Low-Voltage Spot Networks using Local Measurements Jubair Yusuf, Joseph A.Azzolini, Matthew J.Reno . Sandia National Laboratories, Albuquerque, NM, USA |
Abstract
Meshed low-voltage (LV) secondary networks are usually deployed in densely populated urban or downtown areas due to their enhanced reliability. To prevent any reverse current flow from these networks back to the upstream feeder, network protectors (NPs) are employed, which disconnect the circuit during faults in the medium-voltage (MV) system. However, the highly sensitive NP reverse current relay trip settings prohibit PV interconnections at the maximum capacity of the spot netowrk. This paper proposes a novel algorithm that desensitizes this trip setting and enables more PV interconnections in spot networks by using only local current measurements without any requirements for running communication network for the whole system. The algorithm is tested on two different distribution systems with multiple spot networks equipped with 2-3 NPs each and was able to make accurate decisions for local PV installation, detect Single Line-to-Ground (SLG) faults, and detect substation feeder opening incidents for grid maintenance.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.