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一种用于提高风电变流器中功率器件寿命的混合空间矢量调制方法

DOI: 10.13334/j.0258-8013.pcsee.2015.19.019, PP. 5003-5012

Keywords: 功率器件,寿命评估,结温,迭代算法,混合调制

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Abstract:

空间矢量调制可分为连续脉宽调制(continuouspulsewidthmodulation,CPWM)和不连续脉宽调制(discontinuouspulsewidthmodulation,DPWM)。与CPWM相比,当变流器采用DPWM时,器件开关损耗较低,使得结温波动较低。DPWM策略被用于变流器,虽然可以提高功率器件的寿命,但是将导致电能质量问题。因此文中结合DPWM和CPWM策略的优点,提出了一种功率器件混合调制方法,该调制方法根据风电场中风速的概率分布切换不同的调制策略。为考虑长时间风速对器件寿命的影响,文中提出了一种适用于不同调制方法的结温数值计算方法。以1.2MW直驱风机系统为例,结合一年的风速和气温快速计算不同调制序列下器件的结温,进而评估了器件的寿命消耗,并且分析了不同调制序列对器件寿命消耗的影响。结果表明,与CPWM和DPWM相比,当采用混合调制方法时,器件年寿命消耗不仅得到大幅降低,而且风机系统并网的电能质量几乎不受影响。

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