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Title Reduction of the Unbalanced Three Phase Input Current by Variable Notch Filter in Active AC Electronic Load
Authors Do-Yun Kim ; Jung-Hyo Lee ; Yong-Seok Lee ; Doo-Yong Jung ; Yong-Chae Jung ; Chung-Yuen Won
DOI 10.6113/TKPE/2012.17.2.158
Page pp.158-165
ISSN 1229-2214
Keywords Variable Notch filter; Three phase Current Unbalance; AC-electric load; Single phase inverter
Abstract In this paper, the test bed using three-phase PWM converter connected with single phase inverter in series is set up to configure an active AC electric load. Since the two topologies, three-phase PWM converter and single-phase inverter, can be operated bidirectionally, the system not only re-generates surplus power to grid but also prevents power dissipation. However, the construction of system has a drawback. That is, ripple components two times of inverter operation frequency occur at DC-Link due to cascade connection, it can be cause of three phase unbalance Since the operational characteristic of the active AC electric load, the power frequency entered into the electric load can be varied, and the ripple of DC-Link is changed as well. In this paper, the three-phase PWM converter using a variable notch filter is proposed, and the reduction of three-phase current unbalance is presented. the validity of the proposed PWM converter using a variable notch filter is verified by the simulation and experimental results.