摘要
雷击是影响风力发电场运行安全的主要因素之一。在雷击过程中,雷电流流过机架和塔筒时会对其中的传感器件、通信线路甚至电力线路产生感应过电压,这些暂态过电压将对风电机组的正常运行造成影响。该文建立了相关的风电机组模型,对雷击引起的暂态过电压进行了计算分析。计算结果表明:塔筒与传输线间的过电压在传输线的上下两端达到最大;设置金属屏蔽层能有效地降低电容耦合过电压;屏蔽层还能使电压波动趋于平坦。
Lightning stroke is one of the important factors affecting the secure operation of wind farm. During the lightning stroke process the induced overvoltage may appear on the sensors, communication line and even the power line which are configured within the stander and barrel tower when lightning current passes through them, the normal operation of wind turbines will be affected by these transient overvoltage. In this paper the model of wind turbines is established and the transient overvoltage caused by lightning stroke is calculated and analyzed. The calculating results show that the maximum of the overvoltage between the barrel tower and the transmission line will appear at the up end and the lower end. It can reduce the capacitive coupling overvoltage by setting metal shielding layer. Moreover, the shielding layer can flat the voltage fluctuation.
出处
《电网技术》
EI
CSCD
北大核心
2004年第4期27-29,72,共4页
Power System Technology
关键词
风电机组
雷击
过电压
雷电流
风电场
风力发电
Capacitance
Electric lines
Lightning
Overcurrent protection
Sensors
Shielding
