Control of permanent magnet synchronous generator based wind turbine and fault ride-through improvement during faulty grid conditions

摘要

This paper presents the control of a wind energy conversion system for maximum power extraction and fault ride-through during faulty grid conditions. The wind system consists of a direct-driven permanent magnet synchronous generator (PMSG), connected to the grid through a back-to-back converter. Maximum power point tracking (MPPT) is implemented with vector control on the generator side during low wind speed conditions, while pitch angle control (PAC) is used during overrated wind speed conditions and during grid voltage sags. On the grid side, the controller keeps the DC-link voltage stable. In addition to the PAC, a power dissipation device is used to dissipate the excess power supplied to the wind turbine during grid faults to improve fault ride-through. The complete system is modelled and simulated using Matlab/Simulink software. The simulation results show the effectiveness of the proposed control system.