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Mitigating Circulating Currents in Islanded AC Microgrids
Journal
2021 National Power Electronics Conference, NPEC 2021
Date Issued
2021-01-01
Author(s)
Aquib, Mohd
Vijay, A. S.
Doolla, Suryanarayana
Chandorkar, Mukul C.
Abstract
Mitigation of circulating currents in islanded AC microgrids is a major concern as it results in the instability of the system, overheating of equipment and reduced transmission efficiency which are caused by the same. The four factors which contribute to the flow of circulating currents in parallel DG systems are: DG output voltage magnitude difference, output voltage phase difference, DC offsets in the output voltages caused by sensor offsets/malfunction and frequency difference. Due to the use of droop control in islanded mode, the last case does not exist. This paper investigates the differential mode circulating current flow in an islanded microgrid due to the first three factors. Two control approaches to mitigate the circulating current issue have been explored and compared for their performance through simulations for 16 possible sub-cases using Simulink/Matlab. The study also considers balanced and unbalanced loads.
Subjects