The harmonic problems, such as distorting supply voltage, decreasing power factor, increasing energy loss, interfering with communication systems etc. are discussed in the part one.

第一部分讨论各种谐波问题，如使供电电压畸变，降低功率因数，增加能量损耗，干扰通讯系统等。

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Active power Filter (APF) technology is one of the important ways to realize harmonic wave compensation of electrical network and improve the quality of power supply.

有源电力滤波器(简称APF)技术是一种实现电网谐波补偿、改善供电质量的重要方法。

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Because of the severe pollution of electrical network harmonic, the harmonic restrain has become an important task of power supply bureau.

由于电网谐波污染严重，对谐波的抑制已成为供电部门的重要任务。

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