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直接驱动型风力发电系统低电压穿越控制策略
引用本文:李建林,徐少华.直接驱动型风力发电系统低电压穿越控制策略[J].电力自动化设备,2012,32(1):29-33.
作者姓名:李建林  徐少华
作者单位:1. 中国电力科学研究院,北京,100192
2. 内蒙古工业大学电力学院,内蒙古呼和浩特,010051
基金项目:国家自然科学基金资助项目(50907067);国家高技术研究发展计划(863计划)(2011AA05A113)
摘    要:提出了直接驱动型永磁同步风力发电系统在电网故障前后的控制策略。采用基于二阶广义积分闭环电网电压跌落检测方法,可精确得出电网电压故障信号、正序分量幅值、相位角。电网电压故障信号送给变桨距执行机构,最大限度地调节桨距角,屏蔽部分输入功率,提高系统低电压穿越能力;探索直驱风电系统在电网电压跌落发生后的控制策略,并实现与正常运行模式的快速平滑切换。故障前,网侧变流器运行在单位功率因数状态,保持直流侧电压恒定;故障后运行在STATCOM模式,依据检测环节所提供的电网电压正序分量幅值和相位角来决定变流器所发无功电流的量值,为电网提供动态无功支持。基于超级电容器的双向DC/DC变换器作为直流侧保护电路,来快速维持直流侧电压稳定。

关 键 词:风力发电  同步发电机  直接驱动  低电压穿越  STATCOM  变桨距  控制  保护  DC/DC变换器

Control strategy of low-voltage ride-through for direct-drive wind power generation system
LI Jianlin and XU Shaohua.Control strategy of low-voltage ride-through for direct-drive wind power generation system[J].Electric Power Automation Equipment,2012,32(1):29-33.
Authors:LI Jianlin and XU Shaohua
Institution:1.China Electric Power Research Institute,Beijing 100192,China; 2.Electric Power Institute,Inner Mongolia University of Technology,Huhhot 010051,China)
Abstract:The control strategy of direct-drive permanent-magnet synchronous wind power system during grid fault is proposed.The detection method based on the second-order generalized integrator closed-loop is adopted for grid voltage drop to precisely obtain the grid voltage fault signal,positive-sequence component amplitude and phase angle.The grid voltage fault signal is sent to the variable pitch actuator to rapidly adjust the pitch angle and shield part of the input power for improving system LVRT(Low-Voltage Ride-Through) ability.The LVRT control strategies of direct-drive wind power system during grid voltage drop are explored for realizing the quick and smooth transformation of normal operating modes.Before failure,the grid-side converter operates with unity power factor to keep DC-side voltage constant;after failure,it operates in STATCOM mode,providing the dynamic reactive power support according to the detected magnitude and phase angle of grid-voltage positive-sequence component.The super-capacitor-based bi-directional DC-DC converter is applied in the DC-link protection circuit to quickly maintain the DC-link voltage stable.
Keywords:wind power  synchronous generators  direct-drive  low-voltage ride-through  STATCOM  variable pitch  control  electric power system protection  DC-DC converters
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