Sliding-mode-principle-based rapid charging control method for hybrid energy storage system of electric automobile

Abstract

The invention provides a sliding-mode-principle-based rapid charging control method for a hybrid energy storage system of an electric automobile. The rapid charging control method comprises the steps of firstly, controlling the current of a storage battery to be modulating periodic positive-negative alternating pulse current to realize rapid charging; secondly, absorbing the energy fed back to a direct-current bus when the storage battery is used for discharging by utilizing a supercapacitor so as to prevent the pumping of the voltage of the direct-current bus; and finally, when the storage battery is charged, adjusting the output current of the supercapacitor to realize the control on the storage energy of the supercapacitor and further preventing the voltage of the supercapacitor from exceeding the upper limit born by the device, wherein the influence on the performance of the system caused by the change of the work points is reduced as the control of a controller of the supercapacitor adopts a sliding mode control method. Being known from the simulation result, the sliding-mode-principle-based rapid charging control method can well control the current of the storage battery so as to enable the current to form into positive and negative pulses, and meets the stability of the voltage of the direct-current bus and the control on the terminal voltage of the supercapacitor.

Description

【Technical field】 [0001] The invention relates to the technical field of new energy (electric vehicles), in particular to a control method for realizing positive and negative pulse fast charging of batteries of electric vehicles by using a hybrid energy storage device. 【Background technique】 [0002] Since the 1970s, energy and environmental protection have gradually become one of the world's mainstream concerns. With the continuous increase of energy consumption and the increasingly serious problem of environmental pollution, countries around the world have begun to implement targeted energy conservation and emission reduction plans. How to limit vehicle exhaust has basically become a problem that every country needs to face and to be solved. Electric vehicles have attracted much attention because of their low emissions and low noise, and are considered to be the best substitutes for traditional fuel vehicles. [0003] However, in the current application and research of el...

AI Technical Summary

Problems solved by technology

Some research schemes use additional magnetic components to achieve energy feedback and improve efficiency, but in high-power applications, the volume and weight of the required magnetic components will affect the overall performance of electric vehicles

There are also some research schemes that use bidirectional converters to realize energy feedback. This scheme also has disadvantages in high-power applications, that is, the energy fed back to the DC bus will cause the DC bus voltage to rise, affecting the control effect, or even affecting system stability

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