NDLI: Sequence current component and its power direction-based improved protection for spot network with DERs

Content Provider	IET Digital Library
Author	Zhang, Zhihua Crossley, Peter Xu, Bingyin Yin, Mingze
Abstract	Spot network has very high supply reliability and it is beneficial for integrating distributed energy resources (DERs). In conventional spot network, all the feeders are the sole power source, providing unidirectional power to the secondary network. The equipped network protector prevents power flow from the network to the feeder, to protect the transformer against upstream fault. If there are amounts of DERs injected, excess power inside the network will lead to frequently mistrip of the protector because the cause of reverse power cannot be differentiated. This study presents an improved protection for spot network with high penetration of DERs. It is based on the sequence current component and its power direction. There are various positive and negative components when different types of fault occur at different locations. Based on the sequence current variation, the reverse power caused by fault or by DERs can be differentiated. Then the fault can be located by comparing the sequence power direction among feeders. Based on this theory, the sectionalized bus-bar protection is also discussed. The simulation results prove that the proposed method functions effectively on enhancing the penetration amount of DERs and improving the supply reliability further.
Starting Page	1634
Ending Page	1644
Page Count	11
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 7, May (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.0550
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-02-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	DER Distributed Energy Resources Distributed Power Generation Feeder Transformer Power Direction-based Improved Protection Power Flow Power Generation Protection Power Source Power System Protection Power Transformer Sectionalised Bus-bar Protection Sequence Current Component Spot Network Supply Reliability Transformer And Reactors Unidirectional Power Voltage Secondary Network
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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