Application of internal model control method in permanent magnet direct drive tide power generation system

GE Benxing, WANG Qin, YANG Huan, ZHAO Rongxiang

（College of Electrical Engineering Zhejiang University, Hangzhou 310027, China）

Abstract: Aiming at design of permanent magnet directdrive tide power generation control system, tide current speed model, MPPT, vector control of PMSM and control of gridconnected inverter were researched. A kind of speedregulating strategy based on internal model control method and a sort of novel small signal model of gridconnected inverter were proposed. On the machine side, the internal model controller was adopted instead of the speed PI controller and on the grid side,comparative accurate control parameter was designed based on the small signal model of gridconnected inverter.Finally, the directdrive permanent magnet tidal current generation system was simulated in Matlab, and this paper also compared the traditional PI control method with the internal model control method under the MPPT. The simulation results indicate that the proposed optimal control strategy can realize accurate control of active power of generators, independent adjustment of reactive power and variable speed constant frequency operation.

Key words: PMSG; internal model control; tidal current generation