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AC Output a b n Figure 8-9a Block diagram of the power conditioning unit with line frequency transformer Fuelcell & Reformer DC/DC Converter DC/AC Converter Battery Transformer Fuelcell Output (25-39V) Fuel Cell DC/DC Boost Converter L1 DC Link (50V) & Battery PWM DC/AC Inverter L-C Filter AC Output (35V) Line Frequency 120/240V Transformer 60Hz output 1:3.5 ++Lf a 50V Vout Cf n S2 S4 C &S1--Lf b Reformer S3 S5 Figure 8-9b Circuit topology of the power conditioning unit with line frequency transformer Efficiency calculation (approximate): Referring to Figure 8-9a, assume: DC-DC converter efficiency = η1 DC-AC inverter efficiency = η2 Line frequency isolation transformer efficiency = η3 The overall conversion efficiency of the power conditioning unit η = η1 * η2 * η3 Assumingη1=0.95(95percent);η2=0.95(95percent);η3=0.98(98percent),thenη =0.88 (88 percent). The main limitation of this system is the low voltage of the entire power conditioning unit, which results in higher current and lower overall efficiency. Another disadvantage is the presence of a line frequency isolation transformer, which is large in size and weight (10kg/kw). Figure 8-9b shows the circuit topology of the power conditioning unit. Power conditioning unit with high frequency isolation transformer: Figure 8-10a shows a similar power conditioning block diagram. In this design, the low frequency isolation trans- former has been eliminated by employing an additional DC-DC conversion stage. The 50V to 400V DC-DC conversion stage includes a high frequency isolation transformer. The fuel cell and the first DC-DC converter are rated for steady state conditions. The second DC-DC converter, along with the DC-AC inverter, is rated for steady state and transient conditions. Figure 8-10b shows the circuit topology of the power conditioning unit. This approach suffers from three power conversion stages in the power flow path, which contributes to reduced efficiency. 8-31PDF Image | Fuel Cell Handbook (Seventh Edition)
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