Power Flow Calculation Method of Islanded Microgrid Based on Graph Parallel Calculation

Due to the influence of distributed power supply access in islanded microgrid, the error of direct power flow calculation is large. Therefore, a power flow calculation method for islanded microgrid based on graph parallel calculation is proposed. From the point of view of fully representing the randomness of microgrid power flow, with the objective analysis of the correlation between multiple random influencing factors as the core, the parameters of isolated microgrid are completely embedded, and the corresponding constraints are set, so that the original nonlinear operation equation of distributed generation is transformed into a form containing holomorphic functions. In the phase of power flow calculation, the reachability graph of Petri net expresses the holomorphic function of islanded microgrid, and the power flow of islanded microgrid is determined by graph parallel calculation. In the test results, the maximum error of the calculation result of node voltage amplitude by the design method is only 0.005 V/p.u, and the maximum error of the calculation result of node voltage phase angle is only 0.0004.