MODELING OF SOLID OXIDE FUEL CELL FOR VOLTAGE SOURCE INVERTERS WITH LCL-FILTERS FOR CONNECTING TO THE THREE-PHASE GRID OF ELECTRICITY
Keywords:
solid oxide fuel cell, sliding mode control, voltage source inverters, connected to the three-phase grid of electricityAbstract
The objective of this research is to apply the dynamic model of solid oxide fuel cell for voltage source inverters with LCL-filter for connecting to the three-phase grid of Electricity. A constant utilization mode has been adapted for the operation of a solid oxide fuel cell using current feedback to adjust the hydrogen input flow rate. The proposed model is used to study the dynamic operation of the solid oxide fuel cell for electric power to the voltage source inverter with LCL-filter to connect to the three-phase grid of Electricity. In the control to adjust the fast response, the active power loop uses the PI control and the current loop uses the sliding mode control. The simulation results show that the dynamic model of the developed solid oxide fuel cell can maintain a constant voltage and also the follow load changes accurately. The voltage source inverter with the LCL filter and using an active damping is connected to the three-phase grid of Electricity at a voltage of 380 V at a frequency of 50 Hz by providing power to the system 50 kW. The current and voltage harmonic distortion equal to 0.92% and 0.1% respectively. Affecting the harmonic current was following IEC 61000-3-2 all requirements.
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