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谐波电网电压下基于矢量谐振控制的双馈异步发电机集成控制策略

, PP. 187-199

Keywords: 谐波电网电压,双馈异步发电机,集成控制策略,正弦定子电流,功率平稳,矢量谐振控制器

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Abstract:

通过建立5次、7次谐波电网电压下双馈异步风力发电机(DFIG)的数学模型,分析了DFIG风电机组运行于谐波电网下所产生的性能恶化。为改进DFIG在谐波电网下的运行性能,以DFIG定子电流正弦或定子输出有功/无功功率平稳为谐波控制目标,在转子电流PI闭环调节的基础上,加入定子电流矢量谐振控制或定子功率矢量谐振控制,以达到上述DFIG在谐波电网下的控制目标。为了有效实现控制目标,深入分析和对比了普通谐振控制器和矢量谐振控制器在DFIG运行于谐波电网下的300Hz交流信号调节性能。矢量谐振控制器由于其更为精确的300Hz交流信号调节能力以及充裕的相位裕度以确保闭环工作稳定性,因而更有助于DFIG在谐波电网下控制目标的实现。通过构建的风电机组,实验结果验证了本文所提出的谐波电网电压下的集成控制策略的正确性及有效性。

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