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双馈感应风力发电机低电压穿越控制策略的理论分析与实验研究

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Keywords: 双馈感应风力发电机,低电压穿越,电网故障,转子变换器

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Abstract:

分析了电网对称及非对称故障时,双馈感应风力发电机定子磁链的动态过程、电网故障过程中发电机定子磁链对转子的影响。在此基础上,分析了单靠改进转子变换器控制策略实现发电机低电压穿越的条件,提出一种利用软硬件结合的方法实现低电压穿越的控制策略,在电网严重故障时限制了双馈感应发电机定、转子电流,保护了双馈发电机励磁变换器,实现了快速地向电网提供功率支持。建立了双馈感应发电机低电压穿越控制模型和3kW双馈感应发电机励磁变换器低电压穿越控制实验系统。实验结果表明,本文提出的双馈感应发电机低电压穿越控制策略动态响应快、方法行之有效。

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