A controller based on resonant filters for a series active filter used to compensate current harmonics and voltage unbalance
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In this paper we present an adaptive controller for the series active filter used to guarantee a balanced voltage on the load side while compensating selected current load harmonics. These objectives are accomplished despite of unbalance and harmonic distortion in both the source voltage and current load. To achieve current harmonics compensation, a bank of (passive) band-pass filters is connected in shunt to the load, where each one is tuned at the harmonic under concern. The series active filter then injects voltage harmonic components at the same frequency of the current harmonics under concern, as a result, it imposes a high impedance on the line path, thus forcing the load current harmonics to flow into the bank of (passive) band-pass filters. The controller also computes the required voltage to be injected by the series active filter to compensate for unbalance and most distortion in the source voltage.
Bandpass filters; Closed loop control systems; Computer simulation; Electric control equipment; Electric impedance; Electric network topology; Harmonic distortion; Vectors; Voltage control; Adaptive controllers; Resonant filters; Adaptive control systems