求翻译：最后通过实验，在分段三次样条曲线拟合和其他拟合方法的相位相对误差和幅值相对误差进行了详细比较，有效的提高了电力系统谐波分析精度.是什么意思？

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Finally through the Emulation experiments, in sub-paragraph 3 Spline curve fitting and other fitting methods for phase now and increase in value now to a more detailed comparison, the effective increase in power harmonics analysis accuracy.

Finally through the simulation experiment, was partitioning three time transect curve fitting and other fitting method phase relative error and the peak-to-peak value relative error has carried on the detailed comparison, effective enhancement electrical power system overtone analysis precision.

Finally, a simulation experiment, in a piecewise cubic spline curve fitting and other fitting methods of relative error of phase and amplitude of relative error in detail, and effectively improve the accuracy for harmonic analysis in power system.

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