Control method and device of converter parallel system

The invention provides a control method and device for a converter parallel system, and relates to the technical field of power electronics, and the method comprises the steps: collecting the network side voltage of a running converter; detecting the network side voltage to obtain a zero crossing point moment of the network side voltage; sending a starting instruction according to the zero crossing point moment, so that the to-be-connected converter starts modulation and enters control; and controlling the to-be-connected converter to operate in a grid-connected manner. The output voltage phase of the to-be-connected converter does not need to be detected, and the converter is directly put into the parallel system when the grid-side voltage has the zero crossing point, so that the time delay of a phase-locked loop is reduced, the phase error caused by the time delay is reduced, the impact on a power grid at the moment when the converter is connected into the power grid can be prevented, and the power grid rel