High performance synchronization algorithm for 600kW EBOP of fuel cell generation system

The electrical balance of plant (EBOP) of molten carbonate fuel cell (MCFC) has three operation modes, i.e., grid-connected (GC) mode, grid-independent (GI) mode, and grid-synchronized (GS) mode. EBOP controls output currents in GC mode and regulates output voltages in GI or GS mode. GS mode is defined as an interface between GI mode and GC mode to make a mode transition smooth, i.e., limitation of inrush currents. Therefore, EBOP must carry out the synchronization for the grid connection and the operation mode transition. In this paper, we propose a synchronization algorithm for EBOP. Proposed algorithm consists of the grid angle detection and the angle synchronization. As used the grid angle detection and the angle synchronization, the proposed synchronization algorithm has the transition of smooth operation mode. And it is fast and robust under the grid disturbances. Simulations and tests carried out to verify the effectiveness of the proposed synchronization algorithm.