Small-signal modeling of wind farm with direct-drive PMSG using the component connection method

Abstract In order to analysis the small signal stability of the direct-drive permanent magnetic synchronous generator (PMSG) based wind farm, this paper makes a small signal model of the windfarm including a detailed model of PMSG adopting a component connection method (CCM). In the process, the system, consist of wind turbine units with PMSG, collection cable, feeder, transmission cable and grid side, is divided into several subsystems. The interconnection between different subsystems is represented by a linear algebra matrix. Then, through integrating the model of each block and the interconnection matrix, the state space matrix of wind farm can be easier to be built. Based on this model, eigenvalue trajectory is applied to analysis control parameters of the wind turbines to achieve better dynamic performance of the system. A simulation model based on MATLAB/SIMULINK of a two by two wind turbines (WT) wind farm is presented as a test system to validate the effectiveness of CCM.