Passivity Enhancement of Voltage-Controlled Inverters in Grid-Connected Microgrids Considering Negative Aspects of Control Delay and Grid Impedance Variations

With growing environmental concerns, the installation of distributed generation systems forming microgrids in power has received much attention recently. This panacea, however, always some challenges with itself. The delay digital control systems, grid impedance variations weak grids, and interaction between paralleled converters a microgrid, which can threaten expectable operation microgrids, are notable examples. Thus, this article formulates these then addresses them so that guarantee stable microgrid. To end, first offers compensation method elaborates it system achieves high robustness against variations. Then, feedforward loop is introduced to makes immune inverters microgrids. Using methods, survive irrespective abovementioned nonideal conditions. grid-forming approach selected as mode microgrid since could be used for both grid-connected islanded scenarios. experimental results laboratory prototype show correctness theoretical conclusions confirm efficiency suggested technique.