Virtual composite impedance circulating current suppression strategy with adaptive adjustment capability

Abstract In the process of accessing distributed power sources in microgrid, there will be serious coupling between active and reactive power, which lead to significant changes inverter outlet voltage impedance increase circulating current phenomenon. The generation accelerate aging devices, reduce efficiency, threaten stable operation system. this paper, mechanism is analysed, basic characteristics are studied, an parallel suppression strategy with adaptive virtual composite droop control dynamic adjustment algorithm proposed. setting can weaken influence line difference on system stability, make equivalent output resistive, inductive device amplitude; implantation dynamically correlates coefficient, enhance decoupling accuracy influenced by changes. simulation platform experimental setup established large‐scale software PSCAD/EMTDC used study scenarios under two conditions equal unequal capacity, rationality proposed tested.