Dynamic Modeling and Control of Permanent Magnet Synchronous Generator (PMSG) in Wind Energy Conversion System

Abstract

Because of the scarcity of available energy resources, it is a matter of time that we have to depend on renewable energy in the near future. And in that case wind energy has to play an important role. But one problem is that wind availability is sporadic and unpredictable and wind speed varies time to time. In response to that problem effective designing of the controller parameters of a direct drive permanent magnet synchronous generator (PMSG) connected to power grid is proposed in this thesis. In our proposed model the direct drive PMSG is connected to the grid network through a back to back full scale converter, coupling transformer and a Low Pass Filter (LPF). Eigen value analysis is used to analyze the small signal stability of the system and the parameters of the system can be well chosen by means of Eigen values sensitive analysis. The relation between modes and state variables can be discovered. Then the influences of the controller’s parameters on the traces of Eigen values are analyzed. According to the traces of Eigen values controller’s parameters and verification of the system stability under some parameter variations were achieved. The simulation results show that with optimized controller parameters the system stability is improved after suffering disturbance of a wind velocity variation and the system dynamic response is consistent with the result of a small signal analysis.