风电场接地方式与零序保护整定计算

Grounding Mode and Zero Sequence Protection Setting Calculation of Wind Farm

风电场占地广、汇集线长、电容电流大,其接地方式涉及到风电场和整个电网的安全稳定运行。针对国内风电场35 kV系统采用的经消弧消谐柜、消弧线圈、电阻3种接地方式,分析了其原理和基本运行特性,给出了相应的汇集系统零序保护整定计算方法,为类似工程提供了有益的借鉴。

A wind farm covers a vast area and the capacitive current of wind farms＇ assemble lines are relatively large. Therefore, the grounding modes of these assemble lines are critical to the safe operation of wind farms and the entire power grid. Three kinds of grounding modes, namely through harmonic elimination cabinet grounding, through extinction coil grounding and through resistance grounding, are analyzed. Based on the analysis a method for calculating the setting parameters of zero sequence protection system is presented which provides a valuable reference for future similar projects.