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As modern accelerator demands a magnet supply with a much higher stability, it is important to improve the quality of the magnet supply. An effective method to improve the output performance active power filter (APF) applied in current supply is proposed. To lowdown the harmonic constituents, the APF circuit generates a harmonic current, which added to the current from the main power supply, to countervail the ones in the supply’s current. At end of this paper, a simulation result is given to prove the effect of APF.
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