中文摘要：

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。

英文摘要：

In order to study the box-type transformers damaged by lightning stroke in wind power plant, transient overvoltage caused by lightning stroke on overhead line power collection system （OLPLS） were calculated. An equivalent model which include wind turbine generator （WTG）, OLPLS and box-type transformers was built. The calculation model is conducted by ATP/EMTP electromagnetic transient simulation software. The effect of different lightning strike, wave of lightning curren4 grounding resistance of WTG and topological structure of WTGs on transient overvohage in both side of box-type transformers were considered. The result shows that： the transient overvoltage in low-side of box-type transformers is inversely proportional to wave head time, when wave head time is 1.2μs, the transient overvoltage in low-side of box-type transformers is 8.75 times of 20 μs, the transient overvoltage in high-side of box-type transformers is hardly affected by wave head time. When grounding resistance is higher, the transient overvoltage in both side of box-type transformers is greater. When lightning stroke the OLPLS, the ring topology has highest reliability, so ring topology is optimal combination.