Hybrid Generators-based AC Microgrid Performance Assessment in Island Mode
Issa, W; Sharkh, S; Abusara, M
Date: 3 April 2019
Journal
IET Power Electronics
Publisher
Institution of Engineering and Technology
Publisher DOI
Abstract
Achieving an accurate steady‐state averaged active power sharing between parallel inverters in islanded AC
microgrids could be realized by a traditional droop control. For identical inverters having the same droop gains, it is
assumed that the transient average power responses will be similar, and no circulating current will flow ...
Achieving an accurate steady‐state averaged active power sharing between parallel inverters in islanded AC
microgrids could be realized by a traditional droop control. For identical inverters having the same droop gains, it is
assumed that the transient average power responses will be similar, and no circulating current will flow between the
units. However, different line impedances could influence the instantaneous power significantly and thus circulating
power flows among the inverters particularly during sudden disturbances such as load changes. This power, if absorbed
by an inverter, will lead the DC link voltage to rise abruptly and trip the inverter, thus, degrading the performance of the
whole microgrid. The problem becomes worse when hybrid generators are serving as unidirectional power source. This
paper assesses the performance of hybrid generators within an islanded microgrid against the mismatch in line
impedances. Two schemes to stabilize the microgrid are proposed. In addition, a participation factor analysis is developed
to select the most effective controller scheme to bound the DC link voltage and minimize the circulating power. Simulation
and experimental results are presented to verify the analysis and the capability of the proposed controller.
Engineering
Faculty of Environment, Science and Economy
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