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考虑基频结温波动的风电变流器可靠性评估

, PP. 258-265

Keywords: 可靠性评估,基频结温波动,低频结温波动,迭代算法

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Abstract:

目前风电变流器可靠性评估,无法在考虑实际风速、气温等外部环境长期随机变化的情况下考虑基频结温波动对变流器可靠性的影响。文中提出一种结温迭代算法,可以快速数值计算出功率模块结温。该方法与结温电热仿真方法相比,在保证计算精度的同时能大大缩短计算时间。文中以1.2MW直驱风力发电系统为例,利用提出的结温数值计算方法并结合实际风速和气温数据快速计算整年器件结温,采用Bayerer寿命模型和线性累计损伤理论实现了计入基频结温波动的风电变流器可靠性评估。最后还对可靠性计算结果进行了验证,对比分析了机侧和网侧变流器的可靠性差异、低频和基频结温波动对变流器可靠性的影响。结果表明,大功率直驱风力发电系统,机侧变流器可靠性问题更为严重,且基频结温波动对变流器可靠性的影响不容忽视。

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