Fuel Cell Hybrid Forklift System Integration And Research On Energy Management Strategy

With the increasing environmental issues and the goal establishment of “carbon neutral” time node in China,pollution-free and zero-emission hydrogen energy has received more and more attention in recent years.Fuel cells,as equipment to convert hydrogen energy into electrical energy,have been widely used in passenger cars,buses,logistics vehicles and other fields;in the application of forklifts,the features of fuel cell emission-free,maintenance-free,and fast energy replenishment fit the forklifts application scenes.Taking an actual electric forklift as the goal,this paper first carries out an actual test route test through the original vehicle lead-acid battery so as to obtain the main electrical parameters of the electric forklift.Then,the fuel cell hybrid power system structure will be matched according to the electrical parameters;the main components inside the system like fuel cells,secondary batteries,DC/DC,etc.will be selected and matched;based on the MATLAB/Simulink platform,a simulation model of the main components will be constructed and to verify the matching parameters of the main components of the fuel cell hybrid power system according to actual test data.This paper also implements a research about energy management strategy of the fuel cell hybrid power system.First,this paper analyzes two kinds of principles and implementation process of the energy management strategies commonly used in engineering,and unified test conditions on the simulation platform to conduct simulation tests.The results of the simulation test compare and analyze the advantages and disadvantages of two energy management strategies.Based on the advantages and disadvantages what have mentioned previously,this paper designed an energy management strategy based on an expert system,and simulation tests are carried out under the same simulation conditions.The results show that the energy management strategy designed in this paper combines the two advantages of this energy management strategy commonly used in engineering: while maintaining the output power of the fuel cell,it can also reduce the fluctuation range of the SOC of the lithium iron battery pack.In order to verify the effectiveness and advantages of the energy management strategy designed,this paper designs the on-site test and test methods.First,to form a set of actual fuel cell hybrid power system for forklifts based on the main component parameters that have passed the simulation verification,and formulate the actual test conditions to verify the system performance;after that,the three energy management strategies are actually compared and tested,whose results are consistent with the simulation ones.Finally,this paper also compares the measured results of fuel economy according to the equivalent hydrogen consumption formula.The calculation results show that the equivalent hydrogen consumption of the energy management strategy designed in this paper is: 0.07027 kg,two energy management strategies of the equivalent hydrogen consumption often used in engineering is 0.07651 kg and 0.07579 kg respectively.The calculation results show that the energy management strategy designed in this paper can effectively reduce hydrogen consumption and improve economic effects of fuel.