METHOD FOR HV BUS VOLTAGE CONTROL IN FUEL CELL VEHICLES FEATURING HV LITHIUM BATTERIES

摘要

A system for reducing oscillations on a high voltage bus. The system includes a high voltage battery electrically coupled to the high voltage bus and a DC/DC boost converter electrically coupled to the high voltage bus and a fuel cell stack. The DC/DC converter includes a current controller that selectively controls the current provided by the fuel cell stack. A system controller provides a stack current set-point to the DC/DC converter. The DC/DC converter includes a voltage device that receives a voltage signal from the bus and provides a time derivative of the voltage signal that defines voltage changes on the bus over time. The time derivative signal is provided to a summer that adjusts the current stack set-point to provide a modified current set-point to the current controller that selectively adjusts the current provided by the fuel cell stack to dampen oscillations on the high voltage bus.