Electric vehicle composite power supply system energy management method

Abstract

The invention discloses an electric vehicle composite power supply system energy management method, which comprises the steps that a composite power supply system model is established; an energy control strategy module detects change conditions of charge states and load currents of a super capacitor and a battery, uses expected values of charging and discharging power as threshold values, and usesa logic threshold value control strategy to distribute energy respectively needing to be borne by the super capacitor and the battery according to the driving state of a vehicle; a bidirectional DC/DC converter control module performs negative feedback adjustment by adopting a PI controller, and controls the magnitude and direction of the output current of a bidirectional DC/DC converter by taking the error between the target current of the load and the sampling current as the input of the PI controller; and the expected values of different charging and discharging powers are set, and the composite power supply system model is simulated in combination with the working conditions to obtain the optimal expected values of the charging and discharging powers. According to the invention, powerdistribution of the electric vehicle composite power supply system and simulation optimization of expected values of charging and discharging power are realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an energy management method for a composite power supply system of an electric vehicle. Background technique [0002] Factors such as the increasing shortage of petroleum resources and the environmental pollution of automobiles force people to reconsider the power issue of future automobiles. The electric vehicle, which integrates a number of high-tech technologies, has the characteristics of no emission pollution, low noise, low maintenance and operating costs, and is causing a revolution in the world's automobile industry. It will replace fuel vehicles and become the mainstream of future vehicles. [0003] The power battery is the main source of power for electric vehicles, and it occupies the core position in electric vehicles. The driving range, acceleration performance and braking energy recovery rate of the vehicle are inseparable from the performance...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide an energy management method for the composite power supply system of electric vehicles to solve the power distribution of the composite power supply system of electric vehicles and the optimization of the expected value of charging and discharging power

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