直驱式永磁风力发电系统低电压穿越协调控制研究
黄浩，秦斌，石萌
（湖南工业大学 电气与信息工程学院，湖南 株洲 412007）
摘 要：提出一种优先利用风机自身抵御电网低电压冲击的功率协调控制方法。在保证机械轴系安全的前提下，改进双侧变流器电流约束条件，优先利用风机转子和直流母线电容分担风机低电压期间产生的不平衡能量；从能量平衡的角度最后使用卸荷电阻，同时控制变桨系统减小风机低压暂态期间的风能捕获能力，实现全风域范围内安全运行。仿真结果表明，该方法能有效减少卸荷电阻出力并在全风域范围内提高系统低电压穿越能力。
关键词：风力发电；低电压穿越；变流器控制；浆距角控制；卸荷电阻
中图分类号：TM614 文献标识码：A 文章编号：1007-3175(2018)04-0010-04
Coordinated Control Research on Low Voltage Ride Through in Direct Drive Permanent
Magnet Wind Power Generation System
HUANG Hao, QIN Bin, SHI Meng
（School of Information Science and Electrical, Hunan University of Technology, Zhuzhou 412007, China）
Abstract: This paper proposed a kind of power coordinated control method, which preferentially took advantage of the fan itself to resist the low voltage impact of power grid. Under the precondition to guarantee the mechanical axis safe, the bilateral converter current constraint condition was improved to preferentially take advantage of the imbalance of energy storage generated when the draught fan rotor and direct current bus capacitor share responsibility for the draught fan low voltage. From the angle of energy balance, the unloading resistance was finally used, at the same time the variable pitch system was used to reduce the wind energy capture capacity during the period of the draught fan low voltage transient state to realize the safe operation in the whole wind range. The simulation results show that this method can effectively reduce the discharge of the unloading resistance and improve the system low voltage ride through ability in the whole wind range.
Key words: wind power generation; low voltage ride through; converter control; pitch angle control; unloading resistance
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