Independent operation of multiple grid-connected power converters

摘要

A power system with multiple power converters coupled together at a common point of common coupling (PCC) is disclosed. The power converters are connected to a load, and the power converters provide a combined power converter output to the load. A switch is connected in series between the PCC and the external grid. When the switch is closed, the power system is in a grid-connected configuration and the power system is in a microgrid configuration when the switch is opened. Wherein the control system coupled to the power converters enables the switch to be opened and closed in response to a signal received from one or more sensors monitoring the external grid and wherein the power converters operate in a current controlled mode when the switch is closed , And switches the power converters from grid-connected mode to micro-grid mode and synchronizes the power converters to allow the converters to share the load.