accurate power sharing for parallel dgs in microgrid with various-type loads

Authors

abbas ketabi

department of electrical engineering, university of kashan, kashan, iran sahbasadat rajamand

department of electrical engineering, university of kashan, kashan, iran mohammad shahidehpour

illinois institute of technology, chicago, usa

abstract

microgrids are nowadays used to produce electric energy with more efficiency and advantage. however, the use of microgrids presents some challenges. one of the main problems of the microgrids widely used in electrical power systems is the control of voltage, frequency and load sharing balance among inverter- based distributed generators (dgs) in islanded mode. droop method performance degrades when the feeder impedances of two dgs are different and thereby, further modification is required. in this article, a new method based on virtual impedance and compensating voltage is proposed and simulation results show that this method combined with droop control results in balanced power sharing with negligible voltage and frequency drop. simulation results have been extracted from the simulink, matlab and showed that the proposed method has a good performance in equal load sharing between two dgs with different feeder impedances; both in equal and different droop gains, and with different loads such as nonlinear or unbalanced ones.

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Journal title:
energy equipment and systems

جلد ۵، شماره ۱، صفحات ۲۷-۴۱

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