风电并网合闸操作过电压研究

Research on Closing-over-voltage Caused by Wind Farms Connecting to Grid

近年来风电技术发展迅速,风电场并网运行时经常出现电气设备过电压损坏事故,研究分析认为,开关合闸弹跳是引起过电压产生的重要原因。对产生过电压的机理进行了分析,对过电压过程和加保护装置后的效果进行了MATLAB仿真,并与试验结果进行了比较。研究表明,适度增加变压器对地电容可以降低合闸弹跳过电压。

The wind power technology develops fast in recent years. Electrical equipments are often damaged be- cause of over-voltage when wind farms goes on grid integration. The close-bouncing is the main cause of the overvoltage after research and analysis. The reason of the generation of over-voltage is analyzed. Simulations by MATLAB before and after protection are done and the result is compared with the experiment. It shows that increasing the grounding capacitance can decrease the over-voltage.