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Simultaneous Feeder Resonance Damping and Load Current Harmonic Compensation Using Multi-functional DG Units

In this paper, a novel multi-functional distributed generation (DG) unit is proposed for active harmonic control of low voltage distribution networks. The proposed system combines the functions of both power generation and active harmonic compensation in the DG interfacing converters. The active harmonic control is achieved by controlling the performance of the converter at the selective harmonic frequency as a controlled harmonic current source to absorb local load harmonics and a controlled harmonic virtual resistor to damp out the feeder resonance. It has been demonstrated that there is no interference between the multiple control objectives. Simulation results have been provided to validate the correctness of the proposed approach.