The invention relates to a control system for power fluctuations of random fluctuation wind farm plants. The control system comprises a wind generating set, a controller, an AC-DC filter, a DC-AC inverter, an energy storage adjusting module, a lithium battery system and a detection module, wherein AC sides of the AC-DC filter and the DC-AC inverter are connected with a three-phase power grid; the AC-DC filter and the DC-AC inverter are arranged in the detection module in a topological structure; the lithium battery system is connected to the AC-DC filter and the DC-AC inverter; and the controller is respectively connected with the detection module, the AC-DC filter, the DC-AC inverter and the energy storage adjusting module. The control system has the beneficial effects that the output power fluctuation characteristics of a plurality of wind farm plants on the same wind band, and the correlation and the complementary characteristics of the wind farm plants are grasped; a correlation and complementary characteristic model is built; a non-mechanism equivalent model for confluence access of the plurality of random fluctuation wind farm plants and a parameter identification method for the non-mechanism equivalent model are proposed; and the influence rules of confluence access of the plurality of random fluctuation wind farm plants on the stable operation and the power quality of the Jiangsu power grid are grasped.