Controlled islanding of transmission system using synchrophasor measurements

The authors propose a smart transmission system islanding scheme during an out-of-step (OOS) condition using PMU data. An OOS condition leads to the formation of electrical centers on a few transmission lines. The distance relays on the lines misinterpret it as a bolted three-phase fault and trip le...

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Bibliographic Details
Published in:IET generation, transmission & distribution transmission & distribution, 2019-05, Vol.13 (10), p.1942-1951
Main Authors: Raj, Akhil, Gajjar, Gopal, Soman, Shreevardhan Arunchandra
Format: Article
Language:English
Subjects:
16‐generator system
adaptive islanding scheme
coherent generators
controlled islanding
distance relays
distributed power generation
electrical centres
Indian power system
load shedding
load‐rich islands
massive generation‐load imbalance
OOS condition
out‐of‐step condition
overall load
overall load shed
phasor measurement
PMU data
PMU frames
power system relaying
power system stability
power transmission control
power transmission faults
power transmission lines
power transmission protection
relay protection
Research Article
smart transmission system islanding scheme
synchrophasor measurements
three‐phase fault
time 40.0 ms
transmission lines
uncontrolled system separation
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Summary:The authors propose a smart transmission system islanding scheme during an out-of-step (OOS) condition using PMU data. An OOS condition leads to the formation of electrical centers on a few transmission lines. The distance relays on the lines misinterpret it as a bolted three-phase fault and trip leading to an uncontrolled system separation. The load-rich islands can blackout due to massive generation-load imbalance. Recent research has shown that the evolution of electrical centers can be tracked by PMUs and hence, distance relays on these lines can be temporarily blocked from operation. The authors now propose an adaptive islanding scheme wherein (i) the islands contain coherent generators and (ii) overall load shed is minimised. In other words, the authors propose a simple and efficient method for determining the optimal cutset using PMU data. The method does not require explicit coherency determination of generators and can be implemented within the time interval of two PMU frames (40 ms in India). Simulation results on the 16-generator system and the Indian power system demonstrate the efficacy of the proposed method.
ISSN:1751-8687
1751-8695
DOI:10.1049/iet-gtd.2018.5570