基于定子电压定向的自适应控制在电网故障下双馈异步发电机的优化运行策略

摘要

An improved stator voltage oriented (SVO) control strategy of wind turbine control based on doubly fed induction generator (DFIG) was presented.An extra integral controller was utilized into the SVO to clean the static deviation under disturbance of grid voltage.Combining with the controller of maximum power tracking,the quality of power supply of wind turbines was enhanced,and the stability and robustness of the system were improved.The PLECS-based simulation results had showed that the suppression of harmonic voltage was realized and power oscillation was largely reduced by the improved control method.Furthermore,the proposed control strategy could be utilized to further provide the basis for the research on wind farm with high permeability.%提出了一种基于定子电压定向(SVO)的定子磁链动态过程改进控制方案,引入积分环节到转子电流控制器,消除电压故障状态产生的静差,通过自适应调节补偿定子电阻,联合优化的最大功率跟踪器,增强风电机组供电质量,提高系统的稳定性和鲁棒性.基于PLECS算例分析验证,在出现电网电压瞬态跌落故障和电网谐波下,即使风机运行在次同步或超同步状况,提出的控制策略都可以实现谐波抑制,减小定、转子功率振荡、电磁转矩脉动、传动系统机械损耗,为进一步高渗透率风电场研究提供依据和参考.