Deadbands, Droop, and Inertia Impact on Power System Frequency Distribution

Power system inertia is falling as more energy is supplied by renewable generators, and there are concerns about the frequency controls required to guarantee satisfactory system performance. The majority of research into the negative effect of low inertia has focused on poor dynamic response followi...

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Bibliographic Details
Published in:IEEE transactions on power systems 2019-07, Vol.34 (4), p.3098-3108
Main Authors: Vorobev, Petr, Greenwood, David M., Bell, John H., Bialek, Janusz W., Taylor, Philip C., Turitsyn, Konstantin
Format: Article
Language:English
Subjects:
deadbands
droop control
Dynamic models
Dynamic response
Electric power distribution
Energy storage
Frequency control
Frequency distribution
frequency fluctuations
Inertia
Load fluctuation
low inertia grids
Mathematical model
Parameters
Power system dynamics
Probability density function
Probability density functions
Stochastic processes
Transient analysis
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Summary:Power system inertia is falling as more energy is supplied by renewable generators, and there are concerns about the frequency controls required to guarantee satisfactory system performance. The majority of research into the negative effect of low inertia has focused on poor dynamic response following major disturbances, when the transient frequency dip can become unacceptable. However, another important practical concern-keeping average frequency deviations within acceptable limits-was mainly out of the sight of the research community. In this manuscript, we present a method for finding the frequency probability density function (PDF) for a given power system. We pass from an initial stochastic dynamic model to deterministic equations for the frequency PDF, which are analyzed to uncover key system parameters influencing frequency deviations. We show that system inertia has little effect on the frequency PDF, making virtual inertia services insufficient for keeping frequency close to nominal under ambient load fluctuations. We establish that aggregate system droop and deadband width are the only parameters that have major influence on the average frequency deviations, suggesting that energy storage might be an excellent solution for tight frequency regulation. We also show that changing the governor deadband width does not significantly affect generator movement.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2019.2895547