کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
399723 1438740 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimal PI controller design for active power in grid-connected SOFC DG system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر هوش مصنوعی
پیش نمایش صفحه اول مقاله
Optimal PI controller design for active power in grid-connected SOFC DG system
چکیده انگلیسی


• Optimal PI control is proposed for control of grid-connected solid oxide fuel cell.
• Plant control active power achieved with satisfied physical/operational constraints.
• Differential evolution (DE) algorithm is used for PI controller optimal tuning.
• To increase robust performance, ITAE index was optimized in three operating points.
• Simulation results confirmed effectiveness of the proposed method.

This paper is concerned with optimal control of grid-connected solid oxide fuel cell (SOFC) stack based on a model developed and validated in the literature. Recent studies have shown that control of SOFC is challenging due to its slow dynamics and firm operating limits. For an SOFC, while the primary objective is to supply the demand active power, it is crucial to operate fuel cell within its safe operating constraints. In order to meet these requirements, a proper control strategy is developed in this study. This control strategy employs an optimal robust PI controller to control active power of the plant and at the same time satisfies physical and operating constraints via employing two proportional-gained controllers, of fuel utilization factor controller and anode–cathode pressure difference controller in such a way to maintain the fuel utilization factor at its optimal value of 85% and also keep pressure difference between anode and cathode within the safe bound of 0–0.08 atm under transient conditions. A distributed generation (DG) system including an SOFC stack connected to the power grid through an IGBT inverter is implemented in MATLAB/SIMULINK™ environment. Moreover, dynamics of fuel processor are included. In addition, differential evolution (DE) algorithm evaluated by integral of time multiplied by absolute error (ITAE) criterion is used to search for optimal values of PI controller parameters. Dynamics of the DG system are analyzed for the cases of conventional and proposed PI controllers under different load changes and short circuit condition to verify the performance of proposed PI controller. Simulation results show that the proposed controller can provide satisfactory performance for load changes and short circuit condition at the cost of keeping the SOFC performance beyond its operating constraints.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Electrical Power & Energy Systems - Volume 60, September 2014, Pages 268–274
نویسندگان
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