Control strategy for PMSG wind farm based on MPPT and direct power control

A wind farm with variable speed wind turbines usually consists of a large number of wind turbine generators (WTGs) connected and operating simultaneously. The study of a wind farm with permanent magnet synchronous generators (PMSG) is presented. The 10 MW wind farm consists of 5 PMSGs based 2MW generators connected to a common DC-bus. Each PMSG of the wind farm is connected to the DC-bus through a rectifier, but the DC-bus is connected to the grid through only one DC/AC inverter. The proposed control strategy combines pulse width modulation (PWM) and maximum power point tracking (MPPT) control method. The PMSG side converters are used to achieve MPPT. The grid-side converter regulates dc-link voltage and injects the generated power into the AC network. Direct power control of three phases PWM inverter is adopted. Grid-side reactive and active power decoupling method is applied in order to track maximum wind power and regulate the grid-side power factor. Simulation results show that the proposed strategy has excellent performance.