Abstract
To ensure the energy conversion efficiency of a proton-exchange membrane fuel cell (PEMFC), it is necessary to establish a water-cooled cooling system to keep the inlet temperature of fuel-cell coolant and the temperature difference between the inlet and outlet temperature within the set range. First, a semi-empirical and semi-mechanism model was built in Simulink. Then, a variable-universe fuzzy PID controller was designed to adjust the quantization factor and scaling factor by scaling factor α1, α2 and β to improve the accuracy of the control results. Finally, the cooling system model with controller is simulated. The results show that compared with other control methods, the simulation results of the variable-universe fuzzy PID controller have smaller maximum overshoot, faster response speed and more gentle temperature fluctuation.
Highlights
The temperature difference between inlet and outlet in Protonexchange membrane fuel-cell (PEMFC) is controlled by adjusting the speed of the water pump
To verify the performance of the designed expansion factors controller, the c system model of PEMFC is built in Simulink software, in which the 40-kW fuel com5. pSiomsueldinokfR2e1s6ulct ells connected in series
The steady-state error and the temperature difference between inlet and outlet can be controlled within ±1 ◦C and 4 ◦C, respectively
Summary
In the context of the profound adjustment of the global energy pattern, accelerated reconstruction of the energy governance system and the vigorous rise of a new round of energy revolution, China announced for the first time in 2020 that it would strive to realize carbon neutrality by 2060 and achieve zero CO2 emissions in a relative sense. Temperature control is an important link to ensure the efficiency of a fuel cell. Fuzzy control is established based on expert knowledge and practical experience, wh2icofh12has low dependence on the controlled model, simple structure, and good robustness [13], and is frequently used in the temperature control system of a fuel cell [14,15]. The greater the flow rate, the more heat is brought out from the stack, avoiding the phenomenon of excessive loof c1a2 l heat caused by heat accumulation in the stack and ensuring uniform temperature distribution in the fuel cell. The larger the opening degree, the more heat is dissipated, so that the coolant is always in a low-temperature state when 2fl.2o.wCionogliinngtoStyhsetebmatMteroyd, etlhus achieving the purpose of fuel-cell temperature control. The system starts to change with the ambient temperature as the starting value, and obtains the outlet temperature Tout of the fuel cell through ∆T
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