Grid-connected variable flow pulse width modulation phase and frequency cooperation method and system

The invention belongs to the field of electrical control, and provides a grid-connected variable current pulse width modulation phase and frequency collaboration method, which comprises the following steps of: sequentially sending frequencies and phases according to serial numbers of grid-connected converters, and receiving and identifying the corresponding frequencies and phases by the grid-connected converters; acquiring a power grid voltage fundamental wave phase in the grid-connected converter, sending a trigger signal to the grid-connected converter when a certain condition is reached, receiving the trigger signal, inputting the trigger signal and the power grid voltage fundamental wave phase into zero crossing point detection together, converting the signal into a carrier wave ratio, and calculating a carrier wave reference phase, and the difference between the carrier reference phase and the carrier actual phase is input to an anti-saturation PI controller, and a final carrier is output. 本发明属于电气控制领域，提供