Hybrid energy source system for electric vehicle, and control policy thereof

Abstract

The invention discloses a hybrid energy source system for an electric vehicle, and a control policy thereof. The system comprises a hardware circuit and a controller; the hardware circuit comprises abattery pack, a super-capacitor bank, a two-way DC / DC interface circuit one and a two-way DC / DC interface circuit two, of each the battery pack and the super-capacitor bank, connected with a DC bus, and an interface circuit between the battery pack and the super-capacitor bank; the controller comprises an interface circuit controller and an energy management controller; the interface circuit controller can maintain dynamic balancing of each battery monomer voltage in the charging / discharging process according to a battery pack charging / discharging voltage-sharing control program, and also canproduce a control signal to realize the direct energy exchange of two types of storage energy, so that the super-capacitor is operated in an excellent state of charge and can give full play to the power regulating capacity. The energy management controller realizes the reasonable distribution between an accumulator and the super-capacitor.

Description

technical field [0001] The invention relates to the field of energy storage technology and power supply, in particular to a hybrid energy source system for electric vehicles and its control strategy, which is suitable for hybrid energy source systems such as electric vehicles and urban rail transit. Background technique [0002] Under the environment of oil shortage, public awareness of environmental protection has increased significantly, government promotion, laws and regulations have been improved day by day, and people's recognition of electric vehicles has increased, electric vehicles are leading the development trend of the world's automobile industry. A reliable, efficient and low-cost power system is the key to any type of electric vehicle, and the energy storage technology is also one of the key factors restricting the development of electric vehicles. As a new type of energy storage element, supercapacitors have superior performance, especially It has a high power ...

AI Technical Summary

Problems solved by technology

[0003] Due to the low voltage level of the power battery cells, in order to obtain a power battery pack with a high voltage level, multiple power battery cells must be connected in series. However, research and practice have shown that due to the differences in the characteristics of the battery cells, the series battery pack The service life of the battery pack is much shorter than that of a single power battery. In order to improve the service life of the battery pack, a voltage equalization device must be installed for the battery pack to maintain the dynamic balance of the voltage of each battery cell during charging and discharging, and to compensate for the gap between the battery cells. inconsistency

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