在电气化铁道牵引变电站中，装设无功补偿电容器和谐波滤波器是提高功率因数、改善电能质量的重要手段。
In electric railway traction substation, power capacitors and harmonic filters are the important devices for improving both the power factor and the power quality.
有两个组件：一个用于滤波的电容器是用于过滤的电压和电感或呛滤波器的电流。
There are two components used for filtering: a capacitor is used to filter the voltage and an inductor or choke to filter the current.
这种新型的有源滤波器，只用一个电容器、一个运算放大器和两个电阻器。
A new active filter with one capacitor, one operational amplifier and two resistors is presented.
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