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变速风力发电系统统一功率控制策略研究

, PP. 256-265

Keywords: 风力发电,变速机组,统一功率控制,全风速

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Abstract:

针对变速定桨风力发电机组,提出一种统一的全风速范围功率控制策略。该控制策略首先通过扰动观察最大功率跟踪控制方法找出机组的最佳功率运行关系,然后根据得出的最佳功率关系对机组实施功率反馈最大功率跟踪控制以提高跟踪速度。该方法不需要预知风轮的气动特性曲线,具有统一的最大功率控制性能。此外,针对高风速区限转速和限功率控制难的问题,该控制方法通过在高风速区降低机组的运行转速,迫使机组进入失速区运行,实现了机组恒功率软失速运行。在对所提出控制策略的工作原理进行详细分析后,通过实验室建立的风力机模拟系统,对采用不同参数的风轮构成的风力发电系统进行了实验研究,实验结果验证了本文提出方法的正确性和可行性。

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