Modeling and Control of Solid Oxide Fuel cell With Predictive Power Control Method

Connecting a fuel cell with a power system is a key issue in the renewable energy field. Because the fuel cell has an irregular DC and low output voltage, this voltage needs to be increased to connect to the power grid. Fuel cells also have a slow dynamic response due to the slow chemical reaction in which they occur, so we need a DC-DC boost converter in the fuel cell output terminal. In this paper, a 50 kW fuel cell with a DC-DC boost converter is provided for increasing output voltage level, also this voltage converted to AC voltage for connecting a fuel cell to the power system. Model predictive control (MPC) is implemented to control the output active and reactive power of the fuel cell. The control system is based on the criterion function selects the most optimal switching mode for the inverter. The simulation result of the system is evaluated and discussed. The simulation is done with MATLAB software. The results show fast-tracking the reference without distortion at the output as well as the high speed of the control system to power changes.

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