双PMW直驱同步风力发电的低电压穿越控制  

A Low Voltage Ride-through Control Strategy of Permanent Magnet Direct-driven Wind Turbine With a Back-to-Back PWM Converter

作　　者：刘胜文[1] 包广清[1] 范少伟[1] 刘峻[2] 李正元[2] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,兰州730050 [2]甘肃电力科学研究院,兰州730050

出　　处：《大电机技术》2011年第4期15-18,22,共5页Large Electric Machine and Hydraulic Turbine

基　　金：国家自然基金(50877034)

摘　　要：通过对兆瓦级双PMW直驱式永磁同步风力发电机(PMSG)系统低电压穿越能力的研究,本文提出了一种改进的功率变换控制方法来抑制过高的直流母线动态电压。与传统控制方法相比,该方法中机侧整流器采用电流内环、直流母线电压外环的双闭环控制结构,同时网侧逆变器采用电网电流为内环、发电机转速为外环的双闭环控制结构,保证系统输出最佳能量。仿真结果表明本文提出的控制方法有效提高了PMSG系统的低电压穿越能力。The low-voltage ride-through （LVRT） capability of a MW-Level variable speed wind turbine with a direct-driven permanent magnet synchronous generator （PMSG） is investigated. In this paper a novel DC link voltage control scheme was proposed to prevent DC link dynamic voltage from too high value. Comparison of the traditional control method, the machine-side converter uses a double control with the current inner loop and the DC link voltage outer loop; and network-side converter has dual-loop control with grid current inner loop and generator speed outer ring, to output the best energy. The simulation results show that the new control method can effectively improve the low voltage ride through capability of variable speed wind turbines with PMSG.

关 键 词：永磁同步风力发电机 电压跌落 低电压穿越 直流母线电压 

分 类 号：TM614[电气工程—电力系统及自动化]