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风速概率分布对风电变流器中功率器件寿命的影响

, PP. 109-117

Keywords: 功率变流器,IGBT模块,结温,威布尔分布,寿命评估

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Abstract:

通过建立功率器件寿命的概率评估模型,计入实际风电场中风速概率分布对功率器件寿命的影响,评估了不同风电场下不同风机系统中功率器件的可靠性,分析了风速概率分布与功率器件寿命之间的关系,并对研究结果进行深入讨论与验证。结果表明,在实际风电场中,功率器件因基频结温波动而消耗的寿命主要消耗在概率较小而大于某一特定风速的区域,且这一特定风速临近额定风速。因此,不同的风速区间应采取不同的控制策略,可有效降低器件寿命消耗。所得结论为研究如何提高风电变流器中功率器件寿命提供了一种新思路。

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