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Lightning transient characteristics of cable power collection system in wind power plants

机译：风力发电厂电缆集电系统的雷电瞬变特性

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摘要

In recent years, frequent accidents due to lightning have occurred in wind power plants, resulting in damages to electrical equipments in the power collection system, especially in the cable power collection system (CPCS) and the nacelle step-up transformer. In this study, electromagnetic transient simulation of lightning overvoltage in a 35 kV CPCS with the nacelle step-up transformer was carried out. Influencing factors including the location of the step-up transformer, the lightning current, the grounding resistance of wind turbine generator (WTG) and distance between WTGs are taken into consideration. The simulation results show that, in the case of 30 Ω grounding resistance for the WTG, the current flowing through the arrester installed at the high voltage winding side of the step-up transformer will reach up to 27.1 kA when subjected to a 200 kA lightning current, which reveals the damage mechanism of arrester blasting. Based on the calculation results, recommended nominal discharge current value for the arrester as well as the optimal lightning overvoltage protection method are proposed here.
机译：近年来，风力发电厂中经常发生雷击事故，导致电力收集系统中的电气设备损坏，特别是电缆电力收集系统（CPCS）和机舱升压变压器中的电气设备损坏。在这项研究中，使用机舱升压变压器对35 kV CPCS中的雷电过电压进行了电磁瞬态仿真。影响因素包括升压变压器的位置，雷电流，风力发电机的接地电阻（WTG）和WTG之间的距离。仿真结果表明，在WTG的接地电阻为30Ω的情况下，流经升压变压器高压绕组侧安装的避雷器的电流在受到200 kA雷电影响时将达到27.1 kA。目前，这揭示了避雷器爆炸的破坏机理。根据计算结果，提出了避雷器的推荐标称放电电流值以及最佳的雷电过电压保护方法。

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