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Long motor feeders are common for variable speed drives used in underground mines and sub-sea pumps. Over-voltage motor problems arise, and so filter networks are mandatory with voltage source inverters. Among the various filter types, the motor terminal resistor-capacitor (RC) filter and inverter output resistor-inductor-capacitor (RLC) filter are the most common. This article studies and compares the effects of such filters on the vector control performance and the motor voltage/current quality. The drive performance study considers no-load/load conditions in terms of line voltage and current harmonics, effects on flux and torque current components, DC-link current harmonics and common mode voltage. The effects of feeder length on filter losses, DC-link current and voltage regulation are also investigated. The effects of feeder parameters detuning errors on filter performance are analysed in detail. Simulation and practical results substantiate the study.
Date of Publication: May 2011