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AC Output a b n Figure 8-10a Block diagram of the power conditioning unit with high frequency isolation transformer within the DC-DC converter stage Fuelcell & Reformer DC/AC Converter with Isolation DC/DC Converter Battery Fuelcell Output (25-39V) Fuel Cell & Reformer DC/DC Boost Converter L1 S1 DC Link (50V) & Battery DC/DC Converter with Isolation 1:K PWM DC/AC Inverter L-C Filter 120/240V 60Hz output a b L S2 + Vout - S3 S6 LF C LF C C S7 8-32 L + S4 200 V - + S5 200 V DC/AC Inverter - CF CF n Figure 8-10b Circuit topology of the power conditioning unit with high frequency isolation transformer within the DC-DC converter stage (3,4) Figure 8-11a shows a power conditioning unit with fewer power conversion stages in series. In this approach, a push-pull type boost converter with a 1:10 gain employing a high-frequency isolation transformer is used. The output of the push-pull DC-DC converter is set to 400V with ± 200V. The DC-DC converter output is connected to two half bridge dual voltage DC-AC inverters to obtain 120/240V AC output. It is economical to install a ± 200V battery at the output of the DC-DC converter stage and regulate the push-pull DC-DC converter output to ±200V. The fuel cell and the push-pull DC-DC converter are rated to supply steady state load (10kW), while the DC-AC inverter stage is rated to supply the steady state as well as transient load demands such as motor starting, etc. Figure 8-11b illustrates the possible circuit topology for this approach. Assuming conversion efficiency of the DC-DC and DC-AC stages to be 96 percent each, an overall efficiency of 92 percent can be realized with this approach. Figure 8-12 shows the fuel cell power conditioner control system block diagram for powering a load. The DC-DC and DC-AC control blocks are controlled separately. The power consumed by the load is first computed by the reference signal generator block, and suitable reference signals for the DC-AC inverter and the fuel cell controller are generated. The DC-DC converter controller regulates the dc-link and draws power from the fuel cell. This block has the appropriate protection circuitry and limits to protect both the fuel cell and the dc-link against over-current and over-voltage, respectively. Fuel cell accessory loads are supplied via the dc-link. The battery also provides start-up power for this unit.PDF Image | Fuel Cell Handbook (Seventh Edition)
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