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高压电器  2015 

风电场架空集电系统雷电暂态过电压分析

DOI: 10.13296/j.1001-1609.hva.2015.10.006, PP. 34-39

Keywords: 风电场,架空集电线路,箱变,暂态过电压,ATP/EMTP,拓扑

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Abstract:

针对风电场集电系统箱变在雷害事故中大量损坏的现状,对雷击风电场架空集电线路引起的暂态过电压进行了计算。运用ATP/EMTP电磁暂态仿真软件建立了包括风电机组、集电线路和箱变的等效模型,考虑了雷击方式、雷电流波形、风力机接地电阻以及风电机组拓扑结构对箱变两侧暂态过电压的影响。研究结果表明箱变低压侧的暂态过电压与波头时间成反比关系,波头时间为1.2μs时箱变低压侧的暂态过电压是20μs时的8.75倍,箱变高压侧的暂态过电压几乎不受波头时间的影响;接地电阻越大,箱变两侧的暂态过电压越大;风电机组架空集电线路遭受雷击时,环形拓扑的可靠性最高,环形拓扑联合为风电机组的最优联合方式。

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