Distributed energy management method for hybrid power system of electric vehicle

Abstract

The invention discloses a distributed energy management method for a hybrid power system of an electric vehicle. The distributed energy management method comprises the following steps: 1) building thehybrid power system of the electric vehicle; (2) outer loop control is designed for a main power supply unit and an auxiliary energy storage unit of an electric vehicle hybrid power system, and pulsating load power is controlled to be dynamically and optimally distributed; 3) designing inner loop control for a main power supply unit and an auxiliary energy storage unit of the hybrid power systemof the electric vehicle, and further comprising the following steps: i) establishing a mathematical model of the hybrid power system of the electric vehicle; ii) designing a control target of inner loop control; and iii) designing a controller, and controlling the input current of the converter of the main power supply unit and the converter of the auxiliary energy storage unit through the controller to accurately track a desired current reference. Dynamic optimization distribution of pulsating load power among different power supply units and recovery of braking energy are achieved, and the global stability of an electric vehicle hybrid power system in the driving process is guaranteed.

Description

technical field [0001] The invention relates to technical fields such as a hybrid energy storage system and a hybrid power supply system, and in particular to a decentralized energy management method for a hybrid power system of an electric vehicle. Background technique [0002] Petroleum consumption in the transportation industry has grown rapidly in recent years due to the surge in the number of private cars. In addition, environmental issues such as the greenhouse effect and air pollution are also closely related to vehicle exhaust emissions. Therefore, international organizations and governments of various countries have formulated more stringent energy consumption and emission standards. In this context, the new energy automobile industry has developed rapidly. [0003] Generally, due to fluctuations in terrain and driving speed, especially in cities, the power demand of the car has strong pulsation and wide frequency domain variation characteristics (the time scale s...

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Problems solved by technology

[0011] In view of this, the object of the present invention is a decentralized energy management method for electric vehicle hybrid power system, to solve the problem of dynamic optimal distribution of load power among different power supply units, and how to realize the extension of the service life of the system, Improve the fuel economy of electric vehicles and ensure the overall stability of the hybrid system of electric vehicles during driving

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