Reduction in Voltage Harmonics of Parallel Inverters Based on Robust Droop Controller in Islanded Microgrid

In this article, a distributed control scheme to compensate for voltage harmonics in islanded microgrids is presented, where each generation (DG) source has primary level and secondary level. addition the current loops, of DGs includes virtual impedance loops main harmonic components, which are responsible dividing power component non-main (harmonic) between microgrid, respectively. For coordinated operation inverters when facing islanding phenomenon, it very beneficial use droop controller structure. Here, traditional modified such way that proportionally divided DGs, causes accurate regulation at output DGs. By presenting model inverter connected nonlinear load, designed. Through related harmonic, voltages calculated added reference voltage, improves quality voltage. Then, loop with resistive presence loads that, combined controller, total distortion (THD) significantly reduced. Lastly, proposed method implemented on microgrid through MATLAB software, results show ability reduce parallel inverters.