NDLI: Relay logic for islanding detection in active distribution systems

Content Provider	IET Digital Library
Author	Vatani, Mehrnoosh Amraee, Turaj Ranjbar, Ali Mohammad Mozafari, Babak
Abstract	This study presents a passive model to detect islanding conditions of synchronous distributed generation resources in a distribution network or a microgrid. The proposed approach uses the classification and regression tree algorithm for distinguishing between islanding and non-islanding situations. It utilises the rate of change of frequency (ROCOF) and harmonic content of the equivalent reactance seen at the location of distributed generation as input features for decision tree construction. Indeed the thresholds of the proposed input features are extracted by the decision tree algorithm. The output if-then rules of the decision tree algorithm are then utilised to make a new relay logic for islanding detection. The proposed scheme successfully classifies the input data with approximately zero non-detection zone and prevent false operation of traditional scheme. The performance of the proposed protective algorithm is compared with the traditional ROCOF relay, artificial neural network and support vector machine techniques. The proposed method is implemented in a typical microgrid, which is connected to the transmission network of the dynamic WSCC three-machine, 9bus test system with considering electric faults at upstream transmission and sub-transmission networks.
Starting Page	1254
Ending Page	1263
Page Count	10
ISSN	17518687
Volume Number	9
e-ISSN	17518695
Issue Number	Issue 12, Sep (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/9/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2014.0373
Journal	IET Generation, Transmission & Distribution
Publisher Date	2015-04-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Distribution System Artificial Neural Network Classification-regression Tree Algorithm Decision Tree Construction Distributed Generation Location Distributed Power Generation Distribution Network Dynamic WSCC Three-machine 9-bus Test System Electric Fault Equivalent Reactance False Operation Prevention Feature Extraction Harmonic Content Islanding Condition Detection Knowledge Engineering Technique Neural Computing Technique Neural Nets Output If-then Rules Passive Model Power Distribution Protection Power Engineering Computing Power System Protection Power Transmission Fault Power Transmission Reliability Protective Algorithm Rate-of-change-of-frequency Relay Logic Relay Protection Reliability Subtransmission Network Support Vector Machine Support Vector Machine Technique Synchronous Distributed Generation ReSource Traditional ROCOF Relay Typical Microgrid Upstream Transmission Network Zero-nondetection Zone
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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