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基于VSC-HVDC海上串联拓扑风电场低电压穿越控制策略研究

, PP. 362-369

Keywords: 海上直流输电,串联拓扑,低电压穿越,弱磁,变桨距角

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Abstract:

本文提出了一种在海上柔性直流输电中,直驱永磁同步风力发电机串联拓扑风电场在电网电压跌落期间的一种协调控制策略。机组在低电压穿越期间采取机侧变流器控直流侧母线电压以及在发电机输出端饱和时进行弱磁控制,网侧岸上MMC换流站向大电网输送无功功率,以维持总直流电压稳定。并对每台机组的叶桨距角进行协调控制,有效的对多台机组的转速进行调节,在整个风场系统在安全稳定的情况下储存更多的风能,最终实现在电网电压故障期间的低电压穿越。仿真表明该方案使系统在电网电压跌落期间整体运行效果稳定,并可很好的实现对多机组转速的协调控制,在工程上有一定的应用参考价值。

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