Energy management control method of vehicle hybrid power supply based on nonlinear programming

Abstract

The invention discloses a non-linear programming-based energy management and control method for a vehicle-mounted hybrid power supply, comprising: establishing a model of a storage battery and a super capacitor; Establish the second objective function based on the internal charge and discharge energy; set the voltage constraints of the supercapacitor and the current constraints of the supercapacitor on the DC bus side, and minimize the capacity of the supercapacitor according to the voltage constraints of the supercapacitor; establish based on nonlinear programming theory The third objective function and its constraints; construct the Lagrangian function, obtain the DC bus current in real time, solve the Lagrangian function based on the convexity assumption, and use its optimal solution as the reference current output by the battery to ensure that the battery Work in a constant current mode, control the battery to meet the energy demand of the electric vehicle load, and the supercapacitor to provide the power demand of the load.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an energy management and control method for a vehicle-mounted hybrid power supply. Background technique [0002] With the advantages of energy saving, environmental protection and high efficiency, electric vehicles have become a strong support for the transition of the automotive industry to a sustainable development strategy. However, the current batteries used in electric vehicles still cannot fully meet the frequently changing high power requirements in driving conditions, resulting in a greatly reduced cycle life of the batteries. If energy storage devices that support high peak power, such as supercapacitors, are applied to electric vehicles alone, due to the low performance of supercapacitors in terms of energy density, the driving range of the entire vehicle will be very limited. Based on this, combining high-energy-density batteries and high-power-density supercapacito...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a non-linear programming-based energy management and control method for a vehicle-mounted hybrid power supply, which effectively solves the technical problem that the energy between the storage battery and the supercapacitor in the existing hybrid power supply cannot be reasonably managed and controlled

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