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8.2.1 Introduction to Fuel Cell Power Conditioning Systems Various power conversion “building” blocks, such as DC-DC converters and DC-AC inverters, are employed in fuel cell power conditioning systems. Figure 8-7 shows a typical variation of the output voltage of a fuel cell stack in response to changes in load current. Since the DC voltage generated by a fuel cell stack varies widely and is low in magnitude (<50V for a 5 to 10kW system, <350V for a 300kW system), a step up DC-DC converter is essential to generate a regulated higher voltage DC (400V typical for 120/240V AC output). The DC-DC converter is responsible for drawing power from the fuel cell, and therefore should be designed to match fuel cell ripple current specifications. Further, the DC-DC converter should not introduce any negative current into the fuel cell. A DC-AC inverter is essential to provide the DC to useful AC power at 60Hz or 50Hz frequency. An output filter connected to the inverter filters the switching frequency harmonics and generates a high quality sinusoidal AC waveform suitable for the load. 45 40 35 30 25 20 Fuel Cell V-I Curve 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 Current (A) Figure 8-7a Typical fuel cell voltage / current characteristics [1] 900 800 700 600 500 400 300 200 100 Power vs. Current 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 Current (A) Figure 8-7b Fuel cell power vs. current curve [1] 8-28 Power (W) Fuel cell voltage (V)PDF Image | Fuel Cell Handbook (Seventh Edition)
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