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A new control system with a control delay compensation for a current-source active power filter

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2 Author(s)
Salo, M. ; Inst. of Power Electron., Tampere Univ. of Technol., Finland ; Tuusa, H.

In this paper, a new control system for the current-source active power filter is presented. The harmonic current compensation is realized using combined feedforward control of the load currents and closed-loop control of the supply currents. The control system includes a simple method for compensating the sampling and calculation delays of the digital control system. The compensation in the proposed method is achieved using the regular LC filter of the active power filter as an energy storage for load currents, and no additional components is needed in the main circuit. Furthermore, the calculation power demand of the compensation method is very low and is, therefore, suitable for single-chip microcontroller implementations. The proposed control system is realized using a 32-bit Motorola MPC555 microcontroller. The simulation and experimental results show effective filtering performance also for higher order harmonics of the distorted load currents.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:52 ,  Issue: 6 )

Date of Publication:

Dec. 2005

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