Synchronization involves matching the voltage, frequency and phase angle of the 60/50 Hz sinusoidal waveform of the grid to that of the microgrid DERs so that their waveforms align at the time that the connection is closed between the two grids. The PCC is usually a breaker, relay and/or inverter which is controlled to synchronize the microgrid and its DERs to the EPS (grid) before a connection is made. With inverter-based generating units beginning to dominate these microgrids, a new approach that considers sharing the isochronous and frequency control. The term “grid-forming unit” refers to assets that have the ability to set voltage and frequency (e. The two proposed controllers are based on improving the. A microgrid is a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid.
