One of the key problems for a solid oxide fuel cell (SOFC), which is a high-temperature power-generation plant, is the cooperative control of safe operation and system efficiency during load tracking. Within the constraints of thermal safety, the SOFC plant should have the maximum output efficiency under various static conditions. Moreover, the SOFC system can switch between different static working conditions smoothly, safely, and quickly when the external load power changes. To achieve cooperative thermoelectric control, taking a 5-kW stand-alone SOFC system as the research object, according to the optimal static strategy designed based on the optimal operating curves (OOCs), a sliding mode controller (SMC) is designed and the closed-loop responses are discussed for SOFC system power switching during load tracking. The identification results demonstrate that the electrical coupling dynamic model can depict and predict accurately the electrical characteristics of SOFC stacks. And based on the obtained OOCs, the thermoelectric control can be achieved and thermal safety ensured using the designed SMC.
Journal of Solid State Electrochemistry – Springer Journals
Published: May 31, 2018
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