Abstract
Solid oxide fuel cell (SOFC) is widely considered as an alternative solution among the family of the sustainable distributed generation. Its load flexibility enables it adjusting the power output to meet the requirements from power grid balance. Although promising, its control is challenging when faced with load changes, during which the output voltage is required to be maintained as constant and fuel utilization rate kept within a safe range. Moreover, it makes the control even more intractable because of the multivariable coupling and strong nonlinearity within the wide-range operating conditions. To this end, this paper developed a multiple model predictive control strategy for reliable SOFC operation. The resistance load is regarded as a measurable disturbance, which is an input to the model predictive control as feedforward compensation. The coupling is accommodated by the receding horizon optimization. The nonlinearity is mitigated by the multiple linear models, the weighted sum of which serves as the final control execution. The merits of the proposed control structure are demonstrated by the simulation results.
Highlights
Since the middle of the 20th century, traditional energy was consumed in large quantities, fossil fuels are growing shortage and the environment has been deteriorated
Nonlinearity, multivariable coupling and measurable disturbance are main problems in operation of Solid oxide fuel cell (SOFC) system, we propose a novel MFPC to deal with all the issues problems in operation of SOFC system, we propose a novel MFPC to deal with all the issues simultaneously
Nonlinearity, multivariable coupling and measurable disturbance are main problems in operation of SOFC system, we propose a novel MFPC to deal with all the issues simultaneously
Summary
Since the middle of the 20th century, traditional energy was consumed in large quantities, fossil fuels are growing shortage and the environment has been deteriorated. There still exist many difficulties which should be conquered to promote practical application and commercialization of SOFC, especially, it is crucial to implement an effective control for SOFC system to maintain output voltage as constant and fuel utilization rate kept within a safe range, so that extends the life of the electric pile, improves the operating efficiency and the power quality of SOFC [17,18,19]. Based on constant output voltage mode of SOFC, in the cheap air is as oxidant gas. Air, is necessary to keep constant output voltage [20] and fuelvoltage utilization and fuel utilization rate within a safe range.
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