Analysis and Control of Isolated Current-fed Full Bridge Converter in Fuel Cell System Best Electrical Engineering Projects



Fuel cells are considered as one of the most prominent sources of green energy in future. However, the potential efficiency of fuel cell will he untapped unless an efficient method can be used to Convert the fuel cell low voltage to high voltage grid or user load. Many topologies have been proposed for such applications. However, most of them consider the fuel cell as an voltage source instead of a current source. In this paper, an isolated current-fed full bridge boost converter is proposed as the front end of the fuel cell system, which is more compatible with the fuel cell particularities. Small signal analysis is applied to the compiler and current control method is used. Simulation and experiment results are shown to ,verify the analysis.



Fig. 1. (a) Conventional full bridge current-fed convener; (b) Proposed full

bridge current·fed boost converter



 Fig. 2. Main wavefonns of the proposed converter (simulated)

Fig. 3. Main waveforms of the proposed converter when Vg = 5V. IL = 6A


Fig. 4. Output voltage and inductor current with PI voltage control (simulated)

Fig. 5. Output voltage and inductor current with current control (simulated)

Fig. 6. Output voltage and inductor current with current control during load changing (experiment)


In order to speed up the market acceptance of EVs/HEVs, the capital cost in charging infrastructure needs to lower as much as possible. This paper has presented an improved asymmetric half-bridge converter-fed SRM drive to provide both driving and on-board DC and AC charging functions so that the reliance on off-board charging stations is reduced.  The main contributions of this paper are: (i) it combines the split converter topology with central tapped SRM windings to improve the system reliability. (ii) the developed control strategy enables the vehicle to be charged by both DC and AC power subject to availability of power sources. (iii) the battery energy balance strategy is developed to handle unequal SoC scenarios. Even through a voltage imbalance of up to 20% in the battery occurs, the impact on the driving performance is rather limited. (iv) the state-of-charge of the batteries is coordinated by the hysteresis control to optimize the battery performance; the THD of the grid-side current is 3.7% with a lower switching frequency.  It needs to point out that this is a proof-of-concept study based on a 150 W SRM and low-voltage power for simulation and experiments. In the further work, the test facility will be scaled up to 50 kW.


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