对参数设计中序贯淘汰水平法(SEL)和绝对偏差法进行了研究和改进，提出了以SEL法与绝对偏差法结合为基础的自动变间隔迭代搜索法。

The SEL and the absolute bias approach for parameter design are studied and improved, on the basis of which the variable compartment iteration searching method is advanced in this paper.

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针对电网出现的频率偏差，提出一种谐波负序电流指令的检测方法。

According to the frequency excursion in power systems, this paper proposes a detecting method of harmonic negative current instructions.

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