A harmonic and reactive power sharing control strategy for islanded microgrids

For an islanded microgrid with local linear loads and public nonlinear loads, this paper proposes a control strategy to achieve better reactive power sharing and harmonic current sharing based on second-order general integrator (SOGI) model and virtual impedance. First, the SOGI alternative structure filters out fundamental current and harmonic current respectively. Then, virtual inductance and virtual resistance are introduced to fundamental current and harmonic current, respectively, which meet the traditional frequency/voltage droop control application conditions and improve the reactive power sharing accuracy. In short, not only the public harmonic current can be shared also power quality for point of common coupling (pCC) is improved. The feasibility and effectiveness of the proposed strategy are validated by using Matlab simulation.