Electric automobile two-way wireless charging system transmission power control method

Abstract

The invention belongs to the technical field of wireless charging and particularly relates to an electric automobile two-way wireless charging system transmission power control method. The method includes the following steps that the mutual inductance between a primary coil and an secondary coil of a system is calculated, and an inward-shifting phase angle of a primary convertor and a secondary convertor is obtained through calculation according to an output power command value; a primary controller and a secondary controller correspondingly adjust the phases of bridge arm switching signals inthe primary convertor and the secondary convertor with corresponding clock signals as standards, and control over the direction and the size of the transmission power is uncoupled; and the extreme value of the output current is tracked, so that the phases of control signals of the primary convertor and the secondary convertor are synchronous, and the direction of the system transmission power iscontrolled. The problem that an outward-shifting phase angle is unknowable and uncontrollable due to communication delay is solved, control over the direction and the size of the transmission power isuncoupled, phase information of the high-frequency current in the primary coil and the secondary coil is not needed, the circuit design difficulty and the requirement for the arithmetic speed are reduced, cost is reduced, and anti-interference performance and reliability are improved.

Description

technical field

[0001] The invention belongs to the technical field of wireless charging, and in particular relates to a transmission power control method of a two-way wireless charging system for an electric vehicle. Background technique

[0002] Wireless Power Transfer (WPT) technology has been widely used in smart phones, medical equipment, electric vehicles, industrial automation and other fields. Compared with traditional wired charging, the two-way wireless charging system is more suitable for the application of vehicle to grid (V2G) than wired charging because of its characteristics of no plug-in and unplugging, instant charging, and flexibility. The two-way flow of power between power grids has strong advantages in peak shaving and valley filling, no-load backup, peak power adjustment, and automatic power generation control.

[0003] The control object is the bidirectional wireless charging system (Bidirectional Wireless Charging System, BWCS) of electric vehicles, ...

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