Power Sharing in Three-Level NPC Inverter Based Three-Phase Four-Wire Islanding Microgrids With Unbalanced Loads

The droop-based control schemes are widely used for power-sharing and of the isolated microgrids. conventional droop scheme with inner current voltage controllers can work effectively under ideal voltage. However, existence unbalance tends its performance to worsen. This paper aims propose an enhanced method improve power-sharing, maintain distributed generators’ (DGs) terminal voltages system frequency balanced as well unbalanced loads. enhancements proposed include controller, virtual impedance loop. deals accurate sharing powers in case unequal line zero sequence current. Moreover, enable compensate unbalance, three-level neutral point clamped (NPC) inverters form a three-phase four-wire microgrid. With this scheme, factors (VUFs) DGs’ reduced from 4% less than 1%, negative reactive powers, which also indication have been significantly, is maintained within standard permissible limit 2.5%. Furthermore, local load controller loading DGs when they loads supplied their terminals. investigations carried out simulation lab-based environments validate efficacy method.