Variable structure control method for vehicle-mounted compound power distribution slide film

Abstract

The invention relates to the technical field of power distribution control of fuel cell supercapacitor hybrid power of electromobile, in particular to a variable structure control method for vehicle-mounted compound power distribution slide film. Fuel cell is used as the primary power, and is connected with the direct current bus through an irreversible Boost converter; the super capacitor is used as auxiliary power, and is connected with the direct current bus through a reversible Buck-Boost converter. The method has controls on the irreversible Boost converter and a reversible Buck-Boost converter, can achieve stable direct current bus voltage, precisely tracks the current reference value of the supercapacitor and achieves global asymptotic stability of the control system. The fuel cells are compensated with power by the supercapacitors, the problem of providing instantaneous power and peak power by the cells is avoided, so that the overall efficiency of vehicle-mounted hybrid power is obviously increased; high current charge and discharge can be rapidly and efficiently done by the supercapacitor, which greatly saves energy.

Description

technical field [0001] The invention relates to the technical field of power distribution control of a fuel cell-supercapacitor composite power supply of an electric vehicle, in particular to a sliding film variable structure control method for power distribution of a vehicle composite power supply. Background technique [0002] The fuel cell-supercapacitor composite power supply has been widely studied in the fields of electric vehicles, but the power distribution control between the fuel cell and the supercapacitor in the composite power supply is still a key and difficult issue, which restricts the promotion and application of composite power supply technology. the main bottleneck. In order to ensure the bidirectional dynamic flow of energy and power between the fuel cell, supercapacitor and load, the fuel cell and supercapacitor are usually connected in series with a power converter and then connected in parallel. By actively controlling the power converter, the fuel cel...

AI Technical Summary

Problems solved by technology

Both logic threshold control and fuzzy logic control are rule-based control strategies, but the threshold value in the fuzzy logic control strategy is fuzzy. The control ideas of these two control strategies are roughly the same, and the rules are basically similar, and the control rules are relatively fixed. , cannot be adjusted online in time

For filter control, the power distribution between fuel cells and supercapacitors is basically controlled by controlling the voltage of supercapacitors, which cannot adapt well to changes in the working conditions of electric vehicles.

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