Grid connection using a structure that combines a buck converter and a push-pull converter to reduce the low-frequency current ripple of the fuel-cellopen access
- Son, G.; Kang, F.; Park, S.
- Issue Date
- Institute of Electrical and Electronics Engineers Inc.
- Batteries; Buck converters; Converter; Fuel cells; Fuel-cell; Grid-connected; Harmonic analysis; Inverters; Inverters; Low voltage; Power grids; Push-pull; Switches; Total harmonic distortion (THD); Zero voltage switching; Zero voltage switching (ZVS)
- IEEE Access, v.10, pp.1 - 1
- Journal Title
- IEEE Access
- Start Page
- End Page
- In a grid-connected power generation system using a fuel cell, the low-frequency ripple component must be maintained within an allowable range to improve the lifespan and efficiency of the fuel cell. We propose a grid connection method using a structure that can reduce the low-frequency ripple component of the fuel cell output current by combining a buck converter and a push-pull converter. The proposed converter has a structure in which the inductor of the non-isolated dc-to-dc converter and the current source inductor are shared. Although it is a two-stage structure, it has the same number of inductors as the single-stage method, and the capacitor, an intermediate voltage source, can be removed. The high-frequency transformer is designed so that the rated output is possible even at the lowest output value of the fuel cell. The current peak value of the push-pull converter is reduced by operating the buck converter’s switching frequency at twice the push-pull converter’s switching frequency. The operation mode of the proposed converter and the controller design method will be described in detail. A grid-connected inverter is constructed using the proposed converter, and the feasibility of the proposed approach is verified through simulations and experiments on a 1kW prototype. Author
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- 융합기술공과대학 > Division of Mechatronics Engineering > Journal Articles
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