Input-parallel/output-parallel inverter assembly control device and method

摘要

A method includes controlling multiple networked input-parallel/output-parallel inverters of a fuel cell system as a single inverter assembly by a master controller. A fuel cell system includes a plurality of fuel cell segments, a plurality of DC/DC converters and at least one DC/AC inverter, where an output of each of the plurality of the fuel cell segments is connected to a pair of DC/DC converters, and each of the pair DC/DC converters is connected to an opposite polarity bus being provided to the inverter.

主权项

1. A method, comprising controlling multiple networked input-parallel/output-parallel inverters of a fuel cell system as a single inverter assembly by a master controller, wherein all of the inverters in the assembly receive the same split bus direct current (DC) input from a plurality of fuel cell stack segments as parallel inputs, and output a common three phase alternating current (AC) parallel output to a load, wherein the master controller:
senses a condition of the split bus DC input and controls a power set point and an on/off state of each individual inverter in the assembly to avoid a power collapse of the split bus DC input, and controls the power set point of each individual inverter in the assembly such that the power set point of a first inverter in the assembly is different from the power set point of a second inverter in the assembly.