双PWM永磁同步风力发电控制器设计

Design on the Controller of Dual-PWM PMSG Wind Turbine Systems

传统风力发电系统通常采用光电编码器检测电机转子位置,系统成本较高、可靠性较差。考虑到滑模变结构对环境变化具有很强的适应性,结合最大功率跟踪法,设计了基于滑模观测器的双PWM永磁直驱小型风力发电系统,针对机侧控制器进行理论分析与实验研究。结果表明,滑模观测器对负载扰动及参数误差具有很强的鲁棒性,在较高频率范围内准确估计转子位置。而控制器通过调整风机转速能达到最大风能捕获,适用于小型风力发电。

Traditional wind power generation system usually uses photoelectric encoder to detect the rotor position which has high cost and poor reliability. Considering the suitability of sliding-mode variable structure control in case of disturbance and parameter variation, dual-PWM PMSG wind turbine systems based on sliding mode observer was designed combined with maximum power point tracking method. Theoretical analysis and experimental research for the generator-side controller was done. The results show sliding mode observer has high robustness for the disturbance of load and parameter error and it estimated exact rotor operation in a wider range of frequencies. Controller can capture the maximum wind-energy through adjusting the generator speed for small wind turbines.