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Electrolysis systems use proportional-integral-derivative (PID) temperaturecontrollers to maintain stack temperatures around set points. However, heattransfer delays in electrolysis systems cause manual tuning of PID temperaturecontrollers to be time-consuming, and temperature oscillations often occur.This paper focuses on the design of the PID temperature controller for analkaline electrolysis system to achieve fast and stable temperature control. Athermal dynamic model of an electrolysis system is established in thefrequency-domain for controller designs. Based on this model, the temperaturestability is analysed by the root distribution, and the PID parameters areoptimized considering both the temperature overshoot and the settling time. Theperformance of the optimal PID controllers is verified through experiments.Furthermore, the simulation results show that the before-stack temperatureshould be used as the feedback variable for small lab-scale systems to suppressstack temperature fluctuations, and the after-stack temperature should be usedfor larger systems to improve the economy. This study is helpful in ensuringthe temperature stability and control of electrolysis systems.

Design of the PID temperature controller for an alkaline electrolysis system with time delays