Enhancing Small-Signal Stability of Intermittent Hybrid Distributed Generations
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Date
2020-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
2020 5th International Conference on Renewable Energies for Developing Countries (REDEC)
Abstract
The variability of large-scale photovoltaic/wind hybrid
distributed generation power integrated into the distribution
system causes persistent system oscillations. The oscillations result
in serious small-signal stability issues when these distributed
generation units are not adequately optimised and the network
dynamic variables are unconstrained as seen in the existing renewable
power allocation planning works. In this paper, planning
and design of optimal allocation (sizing, placement) and timing
of intermittent renewable energy hybrid distributed generations
such as photovoltaic and wind is being investigated with the
ultimate goal of maximising the renewable power generated and
absorbed into the distribution network within the required smallsignal
stability level at a minimum net present value of total
cost. The problem is formulated as a stochastic mixed integer
linear program where variables related to small-signal stability
are constrained. The paper also evaluated the impact of these
renewable generation output power variability on the smallsignal
stability of the IEEE-24 bus test system using eigenvalues
analysis. The results indicate a profound improvement on the
small-signal stability of the network, an increase in the quantity
of renewable power absorbed and a significant reduction in the
costs of emissions and electricity.
Description
Keywords
renewable energy, small-signal stability, distributed generation, mixed integer linear programming, distribution network