Control and topologies for three-phase three-level active power filters

Active power filters have been reported effective in eliminating the reactive and harmonic current in the power lines. Most previously proposed methods are based on two level inverters and thus are suitable for low voltage use. In this paper, topologies and control are proposed for three-level three-phase active power filters that expend the voltage and power to the levels desirable for industrial applications. The proposed three-phase active power filter with one-cycle control features high voltage operation with reduced voltage stress on the semiconductor components and simple control circuitry that needs no reference calculation, dq conversion, nor multipliers. Laboratory experimental results based on a 1 kW prototype have demonstrated excellent harmonic suppression capability and rigid robustness.