Abstract
The fuel cell grid-tied power generation system usually includes a dc-dc converter and a dc-ac inverter. In a single-phase system, inherent low-order current pulsations are introduced into the system, which can have harmful effects on the fuel cell stack. For example, reducing the output voltage and output efficiency, a reduction in service life, and even accelerates the degradation rate of the membrane electrode of a proton exchange membrane fuel cell (PEMFC). In addition, dc/ac coupling power can cause distortion in the dc input current and ac grid current. To eliminate the input ripple and ensure high ac power quality on the grid side, this paper proposes a novel power decoupling control for single-phase grid-tied PEMFC systems, which uses an improved model predictive control (MPC) algorithm. With the help of the virtual vector methods, which are realized by a two-stage optimization method, excellent tracking effect and robustness can be ensured. Simulations and experimental results show that the proposed algorithm can not only completely eliminate the input current ripple and reduce the total harmonic distortion (THD) of ac current on the grid side, but also improve the transient performance of the system.
Highlights
With the rapid development of portable devices, automotive applications and new energy power generation technologies [1]–[5], proton exchange membrane fuel cell (PEMFC) has wide range of applications due to its outstanding characteristics
Due to the low dc voltage generated by PEMFC, a dc-dc converter is required in the fuel cell power generation system, to boost the low dc voltage to a higher voltage, and acquires an ac voltage through the dc-ac inverter
When the fuel cell power converter is connected to the utility single-phase grid, the inherent rectification effect will cause low frequency current ripple contents on the output side of PEMFC [10]
Summary
With the rapid development of portable devices, automotive applications and new energy power generation technologies [1]–[5], PEMFC has wide range of applications due to its outstanding characteristics. When the fuel cell power converter is connected to the utility single-phase grid, the inherent rectification effect will cause low frequency current ripple contents on the output side of PEMFC [10].
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