滤波器的设计，实质上是数学逼近理论的应用。
Design of the filter is essentially application of approximation theory.
建立有源电力滤波器的数学模型，是实现其控制的理论基础。
The accurate mathematics model of active power filter is the theory base for control realization.
建立有源电力滤波器的数学模型，是实现其控制的理论基础。
The accurate mathematics model of active power filter is the theory base for control realization.
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