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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...
A crucial component of a grid-connected converter system is the phase-locked loop (PLL) that synchronizes the control to the grid voltage. Accurate, fast responding PLLs are required to provide phase angle and frequency measurements of the grid voltage for control and protection purposes. This paper proposes novel feedback mechanisms using the estimated frequency and phase in single-phase PLLs (in...
In this paper, a 600 KW electrical balance of plant (EBOP) for a molten carbonate fuel cell (MCFC) power plant is introduced. The requirements for EBOP are categorized into as follows : demands on grid interconnection and operational interface with a fuel cell. EBOP has three modes of operation, i.e. grid-connected (GC) mode, grid-independent (GI) mode, and grid-synchronization (GS) mode, to control...
Intentional islanding describes the condition in which a microgrid, which consists of a load and a distributed generation (DG) system, is isolated from the remainder of the utility system. In this situation, it is important for the microgrid to continue to provide adequate power to the load. Under normal operation, each DG inverter system in the microgrid usually works in constant current (or constant...
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