基于popov超稳定性的无刷双馈电机直接转矩控制.doc

全文下标正体 双馈风电系统低电压故障下无功控制方法研究* 张隆1，杨俊华1，陈思哲1，王秋晶2，吴捷3 广东工业大学 自动化学院，广州 510006；2. 国网河南省电力公司信阳供电公司，河南 信阳 464000；3. 华南理工大学 电力学院，广州 510641.) 摘要：在电网电压发生跌落故障期间，基于Crowbar电路的双馈风力发电系统需要吸收大量无功功率。通过分析故障下DFIG系统的运行特点，建立了变桨距角控制模型及网侧变流器的STATCOM控制模型，Crowbar电路动作后，利用变桨距系统调节桨距角来抑制系统转差率，减小系统从电网中吸收无功功率，同时将网侧变换器切换成STATCOM工作模式，为系统提供无功功率补偿，在PSCAD/EMTDC平台进行暂态仿真研究。结果表明，在故障期间Crowbar电路启动后，通过该控制策略能避免系统从电网中吸收过量无功功率，有助于主电网电压的重建和恢复，验证了所提方法的有效性和正确性。 关键词：双馈电机；变桨距；Crowbar；STATCOM；低电压穿越 中图分类号：TM 614;TP273 文献标识码：A 文章编号：1001-1390（2015）00-0000-00 Research on reactive power control of doubly-fed induction generator during the grid voltage sag Zhang long1, Yang Junhua 1, Wang Qiujing2, Chen Sizhe1, Wu Jie3 (1.Faculty of Automation, Guangdong University of Technology, Guangzhou 510006, China. 2. State Grid of Xinyang Grid Company, Xinyang 464000, China. 3. South China University of Technology, Guangzhou510641,China） Abstract: The vast grid reactive power would be absorbed by the crowbar-based doubly-fed induction generator (DFIG) wind turbine when the grid voltage dips fault occurred. The model of pitch control and STATCOM were built by analyzing the characteristics of DFIG system at grid fault. During the crowbar circuit active, the slip of DFIG could be restrained with the pitch controller to reduce the amount of reactive power consumption. The grid side converter was switched to STATCOM operation mode to compensate reactive power of DFIG system. With PSCAD/EMTDC simulation platform, the dynamic process of DFIG system was simulated during the voltage sag. The simulation results show that the amount of reactive power absorbed by DFIG system from grid can be avoided with the proposed control strategy during voltage sag, which contributes to the recovery of the grid voltage. The effectiveness and correctness of the proposed control strategy are verified. Keywords: doubly-fed induction generator, pitch control, Crowbar, STATCOM,LVRT 0 引言( 交流励磁变速恒频双馈感应发电机（Doubly- fed induction g