Bidirectional isolation type resonant power converter control method based on virtual synchronous motor

Abstract

The invention provides a bidirectional isolation type resonant power converter control method based on a virtual synchronous motor to solve the problems of lack of rotational inertia in the charging and discharging process of an electric vehicle, low voltage stability of a power electronic converter, efficiency reduction caused by large reactive power in the operation process and the like. The bidirectional power converter is composed of a DC/DC stage and a DC/AC stage. According to the structural similarity of a three-phase synchronous motor model and a three-phase converter, the DC/AC-levelthree-phase converter can be equivalent to a synchronous motor, the whole electric vehicle charging pile is equivalent to a synchronous motor at the grid-connected point, and the motor can respond tovoltage and frequency disturbance of a power grid in a self-adaptive mode and provide necessary inertia and damping for the power grid. In order to overcome the defect of power loss caused by large reactive current of a traditional DAB converter, a resonance module is added, zero-voltage connection and zero-current disconnection of an interface converter switching device are achieved, and the overall operation efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the field of two-way control of the interaction between the large power grid and the power battery of an electric vehicle, in particular a control method for a two-way isolated resonant power converter based on a virtual synchronous motor, which is suitable for realizing friendly and efficient interaction between an electric vehicle and a power grid and energy conservation two-way flow. Background technique [0002] The shortage of fossil fuels and concerns about air pollution have accelerated the electrification of vehicles. The interconnection of a large number of electric vehicles with the grid will help stabilize the impact of intermittent renewable energy on the grid, and it will also become one of the effective emergency power alternative solutions, which has been generally recognized and welcomed around the world. The performance of electric vehicle charging / discharging / electrical appliances is a key link to ensure the ...

AI Technical Summary

Problems solved by technology

[0005] This invention aims to solve the lack of moment of inertia in the charging and discharging process of electric vehicles, the low voltage stability of power electronic converters, and the efficiency reduction caused by large reactive power during operation etc., a bidirectional isolated resonant power converter control method based on virtual synchronous motor is provided

Images