LCL Filter for 3-Ø Stable Inverter Using Active Damping Method

by Open Science Repository Engineering
(February 2013)


The use of an LCL-filter mitigates the switching ripple injected in the grid by a three-phase active rectifier or three-phase voltage source inverter. However stability problems arise in the current control loop. In order to overcome them a damping resistor can be inserted, at the cost of efficiency. On the contrary, the use of the active damping seems really attractive but it is often limited by the use of more sensors with respect to the standard control and by the complex tuning procedure. This research paper introduces a novel active damping method that does not need the use of more sensors and that can be tuned using Genetic Algorithms (GA) for optimized performance. It consists of adding a filter on the reference voltage for the converter / inverter modulator. The tuning process of this filter is easily done, for a wide range of sampling frequencies using GAs.

Keywords: LCL filter, direct power control (DPC), voltage source inverter (VSI), voltage oriented control (VOC), pulse with modulation (PWM).

Full text

doi: 10.7392/Engineering.70081934.

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