A method and system for fast charging control of electric vehicle based on virtual synchronous motor

Abstract

The invention relates to a fast charging control method and system for electric vehicles based on a virtual synchronous motor. The reactive power, voltage amplitude and angular frequency of the rectifier are calculated based on the voltage / current output by the synchronous grid; Actual charging power; formulate a three-phase current reference command according to the obtained parameters to control the DC bus voltage; control the electric vehicle for fast charging based on the pulse signal generated by the DC bus voltage and the resonant current of the full-bridge resonant LLC converter. The scheme realizes virtual synchronous motor control and constant current fast charging control through rectifier, and has good coordination. The control objectives of the two-stage circuits before and after the system involved are different, and the division of labor is clear; it meets the needs of stabilizing the DC bus voltage and realizes the constant-current fast charging of electric vehicles; it includes an acquisition module connected to the off-board charger system of an electric vehicle, and a determination of module, pre-stage control module and post-stage control module.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and in particular relates to a method and system for fast charging of electric vehicles based on a virtual synchronous motor. Background technique [0002] The exponential growth of traditional fuel vehicles has led to an increasingly serious global energy crisis and environmental pollution. Vigorously developing electric vehicles has become an important measure to address climate change and promote energy conservation and emission reduction. The rapid growth of the number of electric vehicles has made the proportion of this new type of power active load in the distribution network increasing. As one of the important components of electric vehicles, its charging system should be reasonably controlled to meet user needs. It is of great significance to the safe and stable operation of the power grid. [0003] Electric vehicle charging methods are divided into slow charging a...

AI Technical Summary

Problems solved by technology

However, this solution uses resistors to simulate the rechargeable battery of electric vehicles, and realizes constant voltage charging through double closed-loop control. The charging mode is not clear, and fast charging usually uses constant current or constant power charging; secondly, due to the use of an ideal power grid, the simulation results cannot prove the power of VSM. Primary FM Characteristics

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