Research On Control Strategy Of Fuel Cell Air Supply System

Under the social environment where the development and utilization of new energy has become an important strategy at home and abroad,the hydrogen energy and fuel cell industries are booming.The transportation industry has increasingly strong demand for fuel cells,and fuel cell vehicles have become the industry’s key development goals.As a core component of a fuel cell vehicle,a fuel cell system has great research potential.The fuel cell system consists of a power stack,a hydrogen supply subsystem,an air supply subsystem,a temperature management subsystem,and a DC/DC subsystem.In order to obtain the better performance of the entire system,each subsystem needs to be modeled and researched accordingly.As an important part of the air supply subsystem,its research is very important.The following researches are carried out around the air supply subsystem:Firstly,the thesis completed the design and construction of the physical platform of the air supply system.The physical platform of the fuel cell air supply system was independently established in the laboratory,and the parts selection,sensor calibration,and pipe connection were completed.Based on the selection,a test platform was set up to complete the performance tests on different types of air compressors.At the same time,the development of the system software program was completed based on the system microcontroller and LabVIEW.Then,system model development.By combining mechanism modeling and experimental parameter modeling,a state model of the air supply system was established.Based on the experimental data of the air compressor and the working mechanism of the air compressor,the Jensen & Kristensen nonlinear fitting method was used to establish the air compressor model.At the same time,according to the working mechanism of the fuel cell,a corresponding pipeline model was established.In order to accurately model the characteristics,the working voltage model of the fuel cell was established on the basis of considering the role of the fuel cell gas diffusion layer(SDL).In addition,in order to better study the performance characteristics of fuel cells,a stack power model was established.Finally,designed and implemented the corresponding control strategy.Based on the established nonlinear state model of the air supply system,two control strategies including PI control and first-order ADRC are proposed.After setting up the corresponding simulation model in MATLAB,first use the system model to extract the system transfer function,complete the design of PI controller and ADRC control algorithm,and verify the feasibility of the algorithm.Then,the two designed controllers are applied to the actual nonlinear system model for simulation analysis.The results show that the ADRC control algorithm has achieved good control results.