Probabilistic Under Frequency Load Shedding Considering RoCoF Relays of Distributed Generators

The activation of under frequency load shedding (UFLS) is the last automated action against the severe frequency drops in order to rebalance the system. In this paper, the setting parameters of a multistage load shedding plan are obtained and optimized using a discretized model of dynamic system fre...

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Bibliographic Details
Published in:IEEE transactions on power systems Vol. 33; no. 4; pp. 3587 - 3598
Main Authors: Amraee, Turaj, Darebaghi, Mohammad Ghaderi, Soroudi, Alireza, Keane, Andrew
Format: Journal Article
Language:English
Published: IEEE 01.07.2018
Subjects:
Damping
Frequency response
inertia time constant
load damping
Load modeling
Power system dynamics
Relays
RoCoF
Time-frequency analysis
Uncertainty
Under frequency load shedding
ISSN:0885-8950, 1558-0679
Online Access:Get full text
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Summary:The activation of under frequency load shedding (UFLS) is the last automated action against the severe frequency drops in order to rebalance the system. In this paper, the setting parameters of a multistage load shedding plan are obtained and optimized using a discretized model of dynamic system frequency response. The uncertainties of system parameters including inertia time constant, load damping, and generation deficiency are taken into account. The proposed UFLS model is formulated as a mixed-integer linear programming optimization problem to minimize the expected amount of load shedding. The activation of rate-of-change-of-frequency relays as the anti-islanding protection of distributed generators is considered. The Monte Carlo simulation method is utilized for modeling the uncertainties of system parameters. The results of probabilistic UFLS are then utilized to design four different UFLS strategies. The proposed dynamic UFLS plans are simulated over the IEEE 39-bus and the large-scale practical Iranian national grid.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2017.2787861