NEW METHOD OF SIZING A FILTER (RL-C) FOR AN INVERTER WITH SPWM CONTROL IN MEDIUM VOLTAGE ALTERNATING

The need to use SPWM controlled voltage inverters in MV, led us to examine how to filter alternative signals with filters (L-C) and (RL-C). This allowed us to decide on the use of certain formulas for calculating the elements of these filters. Likewise, we have proposed a method of calculating the resistance R by mathematical iterations without using the quality factor Q, in order to obtain a low error rate between the RMS values and the fundamental effective values and THDs respecting the standard 519 IEEE - 2014. The results of these studies obtained using the MATLAB-SIMULINK software are presented in the penultimate session of this article. Nomenclature SPWMSinusoidal Pulse-Width-Modulation THDTotal Harmonic distortion SNApparent power of the alternating load MVMedium voltage alternating voltage (1 kV --- 50 kV) Uphphase-to-phase voltage at the ac load RMSRoot Mean Squared R L CResistance Inductance Capacitor MVDCMedium voltage direct current VSIVoltage Source Inverter