In a hybrid renewable energy system (RES), different types of energy sources are integrated for meeting the continuous power demand. To overcome the problem of intermittent availability of energy RES, suitable energy storage system is required. The energy storage as hydrogen gas is more efficient and suitable for long-term storage applications. Proton exchange membrane (PEM) electrolyzer is used to store the surplus amount of energy from RES in the form of hydrogen gas. In this paper, initially the mathematical modeling of PEM electrolyzer is developed to know the influence of various parameters on the performance. It is noted that the cell voltage and efficiency of the electrolyzer depend on its temperature. Based on this observation, temperature is taken as input parameter, and the system model is identified for PEM electrolyzer using system identification technique. The different black box approaches are used to identify the suitable system by comparing the response on the basis of percentage of fitness, cost function and final prediction error. It is found that Box–Jenkins method is appropriate for PEM electrolyzer with percentage fitness of 90.5%. To check the system stability, Lyapunov stability analysis is applied and it is found to be stable. For the stable system, conventional PID controller based on Ziegler–Nichols method is used to maintain constant cell voltage by varying the temperature of PEM electrolyzer. For the system with the PID controller, the rise time is 3.8 s, settling time is 75.3 s, peak time is 9.3 s and overshoot is 57.4%.
System Identification, Stability Analysis and PID Controller Design for PEM Electrolyzer
Lect. Notes Electrical Eng.
2023-03-12
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
PEM electrolyzer , System identification , Lyapunov stability analysis , PID controller Engineering , Control, Robotics, Mechatronics , Electronics and Microelectronics, Instrumentation , Signal, Image and Speech Processing , Power Electronics, Electrical Machines and Networks , Physics and Astronomy
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