Method and device for monitoring and suppressing resonance

A device for monitoring and suppressing a resonance applied to a grid-connection generation system, wherein the device comprises:

• a sample conditioning circuit connected to a preset sample point of the grid-connected generation system and configured to monitor a current sample voltage of the preset sample point;
• a controller connected to the sample conditioning circuit and configured to acquire amplitudes of harmonics of the current sample voltage using a preset algorithm, verify whether a resonance occurs in the grid-connected generation system based on the acquired amplitudes of the harmonics, and acquire current corrections of parameters of inverters in the grid-connected generation system according to a preset rule in a case that the resonance occurs in the grid-connected generation system;
• a communication bus connected to the controller and the inverters in the grid-connected generation system and configured to transmit the current corrections acquired by the controller to the inverters respectively;
• and
• an adjusting module connected to the controller and the inverters and configured to adjust the parameters of the inverters using the current corrections and a preset resonance suppressing algorithm until the resonance disappears in the grid-connected generation system.