Abstract
In islanded micro-grids, the load current is distributed among the parallel voltage sources inverters according to each inverter output impedance at fundamental frequency. At harmonic frequency, the load is regarded as a harmonic current source, and the current is distributed among the harmonic current path according to each inverter output harmonic impedance. Because of the uncontrollable line impedance, the total inverter output impedance is difficult to determine, thus this will affect the current sharing performance. Virtual impedance is usually come up to ensure the inverter impedance to be inductive. As a result, current can be evenly distributed in parallel inverters system. But the inverter impedance is uncontrollable, to solve this problem, this paper combining the virtual impedance and the harmonic impedance control to get better current sharing performance. Simulation study with three parallel single-phase inverters is provided to validate the proposed method.
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