Control method for fast charging power converter of electric vehicle

Abstract

The invention discloses a control method of a fast charging power supply converter of an electric vehicle, which belongs to the technical field of converter control, and comprises a three-phase PFC converter provided with a pre-stage rectification circuit and a post-stage boost circuit, and a switching device in the pre-stage rectification circuit is coupled with a switching device in the post-stage boost circuit to form a power supply circuit. And a switching device in the pre-stage rectifying circuit and a switching device in the post-stage boosting circuit are jointly controlled, so that current ripples of a direct-current inductor in the fast charging power converter of the electric vehicle are reduced. Under the condition that direct current inductance and switching frequency are not increased, current ripples of direct current side inductance can be effectively reduced, inductance loss, electromagnetic interference and the current distortion degree of a power grid side are reduced, and the control method is simple and has practical engineering application value.

Description

technical field [0001] The invention relates to the technical field of converter control, in particular to a control method for a fast charging source converter of an electric vehicle. Background technique [0002] With the rapid development of the power electronics industry, PFC converters are widely used, such as electric vehicle chargers, renewable energy and smart grids. This kind of PFC converter can realize the improvement of the grid side power factor. Therefore, this kind of PFC converter has been extensively studied in recent years. However, the traditional control method of this kind of PFC converter will make the inductor current ripple in the converter larger, which in turn will cause large inductance loss, large electromagnetic interference, and large degree of grid-side current distortion. In response to this problem, the paper Optimal Space Vector Modulation of Current Source Converter for DC-LinkCurrent Ripple Reduction published in the 2018 international j...

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Problems solved by technology

Professor Jiang Dong of Huazhong University of Science and Technology proposed a method of reducing ripple based on ripple prediction in the paper Variableswitching frequency PWM for three-phase converters based on current rippleprediction published in the international journal IEEE Transaction on Industrial Electronics. The method suppresses the ripple of the inductor current and has achieved good results, but the change of the switching frequency leads to complex control algorithms, increased switching losses, and difficulties in the design of the output filter.

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