Control method and system of four-quadrant converter

The invention provides a control method and system for a four-quadrant converter, and the method comprises the steps: carrying out the sampling of an actual grid-side alternating current of the four-quadrant converter, and obtaining a sampling current; according to the sampling current, a damping compensation factor being obtained, and the damping compensation factor being used for indicating theoscillation quantity of the sampling current; and taking the damping compensation factor as negative feedback, and compensating a reference grid-side alternating current input into a current loop through the current loop of the four-quadrant converter. According to the method, redundant hardware does not need to be added, only current control needs to be conducted on software, and compared with the prior art, hardware cost is reduced, and the implementation mode is simple and flexible; furthermore, a damping compensation factor used for indicating the network side oscillation quantity is usedas negative feedback to co