The paper studys the problem of filtering of zero sequence harmonic. The digital equipment in the com-puter room causes the zero sequence harmonic such as the 3 rd and 9th ones. And the harmonics damage to the equip-ment in the computer room and can cause the energy dissipation in whole power grid. The energy consumption of tra-ditional filter equipment is high, and is not adapted to be used in the digitizing computer room. So the author pro-vides some new idea of using pure electrical inductance elements filters for the zero sequence harmonic. The author deduces a conclusion by using trigonometric function and vector analysis based on some harmonic function. Mean-while, the author makes a simulation model with it, and proves the model by FFT analysis on the power side of cur-rent waveform locating and the load side. And it provides a reliable guideline for product manufacture.%在数字化机房中产生的零序谐波对设备有损害,造成大电网能量耗散.传统滤波设备能耗高,不适宜在数字化设备为主的机房中使用.为滤除数字化机房中设备产生的3、9次等零序谐波,减少能耗,提高大电网的能效,提出了仅使用无源纯感性线圈绕组来设计滤除机房内3、9次等零序谐波装置的新思路.根据零次谐波的数学特性,运用三角函数及矢量分析等数学手段,推理出消除零序谐波的结论公式.同时,根据移相变压器线圈绕组间的电磁耦合关系可以消除和抑制电力系统中谐波的理论方法,并通过建立仿真模型,对电源侧和负载侧电流波形的FFT分析,验证了该模型在滤除3、9次等零序谐波的有效性和可行性,为实际操作提供了可靠依据.
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