Research On Hydrogen Fuel Cell Assembly And Core Subsystems Control

Hydrogen fuel cell,especially proton exchange membrane fuel cell,is a new type of clean power device that can convert hydrogen energy into electricity at room temperature.Compared with traditional internal combustion engines,it has higher energy conversion efficiency and energy density,and is not limited by Carnot cycle.The fuel cell system assembly is mainly composed of the stack and its subsystems.The fuel cell subsystem includes the gas fuel supply system,water management subsystem and thermal management subsystem.Through the study of the fuel cell system assembly,it is helpful to understand the relationship between the fuel cell subsystems and the stack as well as the operation of each part.In addition,as one of the core subsystems,the air supply system and thermal management subsystem have a critical impact on the performance and service life of fuel cells.Therefore,the main research work of this paper focuses on the fuel cell system assembly analysis and the control optimization of the core subsystem air supply system and thermal management subsystem.1.Based on the electrochemical reaction mechanism of the fuel cell and the functional characteristics of each part,the fuel cell is divided into several subsystems,and the simulation models of each subsystem are built in modules on the CRUISE M simulation platform.Each subsystem is connected with the stack to form the fuel cell system assembly.Through simulation analysis,the idea of control optimization of the air supply system and the heat management subsystem is proposed.2.According to the components of the PEMFC air supply system,the mathematical model of the control-oriented air supply system is established.On this basis,the control objective of controlling the PEMFC cathode peroxide ratio at the optimal peroxide ratio is proposed.For this reason,combined with the established air supply system model and the Lyapunov stability principle,a robust tracking controller for the peroxide ratio is designed;Numerical simulation tests are carried out on the simulation platform to verify the effectiveness of the designed controller.3.Based on the analysis of heat generation and release of fuel cell stack,it is proposed to control the stack temperature in the optimal operating temperature range to ensure its working performance.For this reason,this paper considers reducing the influence of external disturbance on the working temperature of the stack as much as possible,and designs an auto-disturbance rejection temperature controller to control the stack temperature at 343 K.On this basis,combined with fuzzy control algorithm,a fuzzy auto-disturbance rejection composite controller is designed for control optimization.Finally,the effectiveness of the designed controller is verified on the numerical simulation platform.Based on the above research,this paper analyzes the composition and working performance of each part of the hydrogen fuel cell at the simulation level,and proposes two different control algorithms for the air supply system and the heat management subsystem to improve the control accuracy of the cathode peroxide ratio and the stack temperature.The research work carried out in this paper provides a theoretical research method for strengthening the understanding of the PEMFC system assembly and improving the working performance of its subsystems,and has certain guiding significance and reference value.