The nonlinear load

such as rectifier device

is one of the main factors causing the issue of harmonic in the microgrid. With the increasing proportion of nonlinear load

however

the interaction between the fundamental power flow and the harmonic power flow should be considered in the process of power flow calculation. Based on this

a method for power flow calculation considering harmonic power correction is proposed based on the operational characteristic of isolated microgrid and the currents' physical components theory under the condition of three phase non-sinusoidal. The microgrid system model and the harmonically coupled matrix modeling of the rectifier device are discussed as the analytical basis. At first

the fundamental power flow is calculated by the processing of the distributed generator and the rectifier interface. Furthermore

the three-phase harmonic voltages and currents are calcalated based on the fundamental power flow

and the corrected deviation for fundamental power flow

which is taken as the convergence condition of iteration for power flow calculation

is obtained by the harmonic power calculation. The test results show the correspondence between the proposed method and the time-domain simulation and verify the validity of the proposed method.