Power transmission method and device of bidirectional wireless power transmission system

The invention discloses a power transmission method and device for a bidirectional wireless power transmission system, and belongs to the field of wireless power transmission, and the method comprises the steps: combining a plurality of adjacent switching periods of excitation voltages at two sides of the system into a modulation period, and modulating the excitation voltages at the two sides of the system by taking one modulation period as a unit. In each modulation period, only the pulse width of a certain voltage half wave is asymmetrically adjusted at the same time, the pulse widths of other voltage half waves are kept unchanged, and the modulation sequence of each voltage half wave needs to enable the excitation voltage to be uniformly distributed along the time axis. The total pulse width beta t of the excitation voltage in each modulation period of the load end of the system is obtained through a PI link, the total pulse width alpha t of the excitation voltage in each modulation period of the source en