Harmonic compensation for three-phase adjustable speed drives using active power line conditioner

This paper reports the development of an active power line conditioner for high power nonlinear loads such as industrial adjustable speed drives (ASDs). This work is motivated by the fact that the ability of a static power converter to perform effectively as a shunt active filter is limited by the power and the frequency distribution of the harmonics for which it must compensate. The proposed system is comprised of a three-phase shunt active filter and series AC line smoothing reactance installed in front of the target load. This system significantly reduces the required shunt active filter bandwidth. The controller is based on a dead-beat control model that describes the dynamics of the proposed active power line conditioner. This model requires only the supply current to be monitored, an approach different from conventional methods. The paper provides background on the topology design and spectral performance for a filter which supports a 15 kVA load that represents a typical adjustable speed drive system. Experimental data indicate that the active filter brings the system into compliance with IEEE-519