Hybrid shunt active power filter (HSAPF) is a kind of harmonics compensatingfilter consisting of shunt active power filter and conventional LC filters.
The active power filter is a new kind of the power electronic plant restraining harmonic and compensating reactive power.
有源电力滤波器是一种用于动态抑制谐波，补偿无功的新型电力电子装置。
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In this paper, the principle of balanced transformation is analyzed; the balance mode, detection of compensating currents and controlling method of the active filter are discussed.