Abstrakt
Low voltage microgrids are autonomous subsystems, in which generation,
storage and power and electrical energy consumption appear. In the paper
the main attention has been paid to the voltage stability issue in low
voltage microgrid for different variants of its operation. In the
introduction a notion of microgrid has been presented, and also the issue
of influence of active and reactive power balance on node voltage level
has been described. Then description of voltage stability issue has been
presented. The conditions of voltage stability and indicators used to
determine voltage stability margin in the microgrid have been described.
Description of the low voltage test microgrid, as well as research
methodology along with definition of considered variants of its operation
have been presented further. The results of exemplary calculations carried
out for the daily changes in node load of the active and reactive power,
i.e. the voltage and the voltage stability margin indexes in nodes have
been presented. Furthermore, the changes of voltage stability margin
indexes depending on the variant of the microgrid operation have been
presented. Summary and formulation of conclusions related to the issue of
voltage stability in microgrids have been included at the end of the paper.
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