A novel fuzzy logic and anti-windup PI controller for a rectifier with direct driven permanent magnet synchronous generator

This paper presents a control strategy for a rectifier with variable speed direct driven permanent magnet synchronous generator. In order to achieve maximum power point tracking (MPPT) for wind power generation systems, the rotating speed of wind turbines should be adjusted in the real time according to wind speeds. The fuzzy logic controller is used to track generator speed with varying wind speed to optimize turbine aerodynamic efficiency in the outer speed loop. The voltage space vector PWM in field-oriented control is adopted in the control of the generator side converter. By means of the field-oriented control, the highest efficiency of wind turbine can be reached. The wind turbine is controlled to work at optimal tip speed ratio and to capture maximum wind energy. The anti-windup PI controller of inner current loop is used instead of the traditional PI controller to improve the performances of current loop. Both simulation and experiments have been conducted to validate the performance of the proposed MPPT strategy, and all results have verified the effectiveness of the MPPT strategy.