LCL Filter and Dampers for a Three-Phase, Two-Level Inverter with Six-Pulse Control

In this article, the LCL filter used for the three-phase two-level inverter with six-pulse control is designed from the components of the LC filter by means of a coefficient k varying between 0 and 1. The coefficient k is used to determine the values of the inductances of the LCL filter in relation to the inductance of the LC filter. The capacitor capacity of the LCL filter is identical to that of the LC filter. To obtain the RMS voltage and current of the load, a method based on measuring the error of the RMS voltage and current of the load is proposed. This approach, applied to the three-phase, two-level inverter with 180˚ full-wave control, enables us to reduce the value of the LCL filter inductance. Satisfactory results are obtained by simulation on MATLAB-Simulink software and compared with the LCL filter results.