Research on Modeling and Control Strategy of Plug in HEV Hybrid Power Supply

To solve the problem of batteries not being able to charge or discharge under high current conditions, the advantages of high specific energy of batteries and high specific power of supercapacitors are combined to form a composite power supply that works together to reduce the constraints of a single battery power supply. Analyze the characteristics of batteries, supercapacitors, and DC/DC converters, establish models for each component of the composite power supply, and determine the model of the composite power supply based on component characteristics and vehicle usage characteristics. Aiming at the control objectives and operating modes of plug-in hybrid power, an optimal interval fuzzy control strategy for the engine is developed to leverage the advantages of composite power sources and ensure that the engine operates within an ideal range. The analysis is verified through Matlab/Simulink simulation.