The module voltage rating
Fig. 4 illustrates definition of the main voltage levels.
Please identify four voltage levels:
• UCOmax Maximum operating voltage,
• UCOmill Minimum operating voltage,
• UCOillM Intermediate operating voltage,
• UCON The ultra-capacitor rated voltage.
i) Maximum operating voltage
The maximum operating voltage of the ultra-capacitor
module depends on the interface power converter topology
and maximum operating dc bus voltage of the power processor
(see Fig. 2). Assuming that direct non-isolated converter is
used as an interface power converter [5], the ultra-capacitor
maximum operating voltage is