Modelling and Control of Fuel Cell Power Injecting System to Single-Phase Weak and Harmonically Network

Document Type : Original Article

Authors

1 Associate Professor, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

2 MSc, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

3 Associate professor, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

4 Researcher, School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland

10.22059/ses.2024.374487.1061

Abstract

Fuel cells have been noticed by researchers due to their high efficiency, low pollution, and high-power density in distributed generation systems. Grid-connected inverters are considered vital elements for effectively connecting renewable energy sources and distributed generation system applications. Ripple-induced current harmonics in DC link and high switching frequency are the disadvantages of grid-connected inverters that are reduced by LCL filters. However, the intrinsic resonance in the LCL filter leads to instability of the power transmission system. As a result, suitable damping is essential for removing resonance in the LCL filters. LCL filters are utilized to reduce switching harmonics and increase the quality of the grid-injected current. The LCL-filters can lead to resonance and instability despite their capability to attenuate harmonics. When digital control is utilized to control grid-connected inverters, the stability of the inverter is weakened against grid impedance changes due to control delays that include computation as well as pulse width modulation delays. In this paper, the design, control, and stability analysis of the inverter-based power conditioner, which is connected to the low voltage grid via an LCL filter, is presented to manage the power flow of the PEMFC. For this aim, the capacitor current feedback active damping procedure is used to alleviate the resonance phenomena caused by LCL filter, and a phase compensator in the is applied to compensate for the unwanted effects of the control delay of the grid-connected fuel cell power conditioning system. To investigate the proficiency of the proposed scheme, the design of each section is presented for the phase compensation and the parameters of the closed loop system under study. The simulation results of the LCL-based grid-connected fuel cell power conditioning system have been performed in MATLAB/Simulink, depicting the suggested method's accuracy.

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References

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Journal of sustainable Energy Systems
Volume 2, Issue 4
October 2023
Pages 329-352

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